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ftpiiu_plugin/source/ftp.c
Michael Theall ec1777084e Synchronize sdmc_dir_t with libctru
2016-04-09 11:55:55 -05:00

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/* This is FTP server implementation is based on RFC 959
* (https://tools.ietf.org/html/rfc959) and suggested implementation details
* from https://cr.yp.to/ftp/filesystem.html
*/
#include "ftp.h"
#include <arpa/inet.h>
#include <ctype.h>
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <inttypes.h>
#include <malloc.h>
#include <netdb.h>
#include <netinet/in.h>
#include <poll.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <time.h>
#include <unistd.h>
#ifdef _3DS
#include <3ds.h>
#define lstat stat
#else
#include <stdbool.h>
#define BIT(x) (1<<(x))
#endif
#include "console.h"
#define POLL_UNKNOWN (~(POLLIN|POLLPRI|POLLOUT))
#define XFER_BUFFERSIZE 32768
#define SOCK_BUFFERSIZE 32768
#define FILE_BUFFERSIZE 65536
#define CMD_BUFFERSIZE 4096
#define SOCU_ALIGN 0x1000
#define SOCU_BUFFERSIZE 0x100000
#define LISTEN_PORT 5000
#ifdef _3DS
#define DATA_PORT (LISTEN_PORT+1)
#else
#define DATA_PORT 0 /* ephemeral port */
#endif
typedef struct ftp_session_t ftp_session_t;
#define FTP_DECLARE(x) static int x(ftp_session_t *session, const char *args)
FTP_DECLARE(ABOR);
FTP_DECLARE(ALLO);
FTP_DECLARE(APPE);
FTP_DECLARE(CDUP);
FTP_DECLARE(CWD);
FTP_DECLARE(DELE);
FTP_DECLARE(FEAT);
FTP_DECLARE(HELP);
FTP_DECLARE(LIST);
FTP_DECLARE(MDTM);
FTP_DECLARE(MKD);
FTP_DECLARE(MODE);
FTP_DECLARE(NLST);
FTP_DECLARE(NOOP);
FTP_DECLARE(OPTS);
FTP_DECLARE(PASS);
FTP_DECLARE(PASV);
FTP_DECLARE(PORT);
FTP_DECLARE(PWD);
FTP_DECLARE(QUIT);
FTP_DECLARE(REST);
FTP_DECLARE(RETR);
FTP_DECLARE(RMD);
FTP_DECLARE(RNFR);
FTP_DECLARE(RNTO);
FTP_DECLARE(STAT);
FTP_DECLARE(STOR);
FTP_DECLARE(STOU);
FTP_DECLARE(STRU);
FTP_DECLARE(SYST);
FTP_DECLARE(TYPE);
FTP_DECLARE(USER);
/*! session state */
typedef enum
{
COMMAND_STATE, /*!< waiting for a command */
DATA_CONNECT_STATE, /*!< waiting for connection after PASV command */
DATA_TRANSFER_STATE, /*!< data transfer in progress */
} session_state_t;
/*! ftp_session_set_state flags */
typedef enum
{
CLOSE_PASV = BIT(0), /*!< Close the pasv_fd */
CLOSE_DATA = BIT(1), /*!< Close the data_fd */
} set_state_flags_t;
/*! ftp_session_t flags */
typedef enum
{
SESSION_BINARY = BIT(0), /*!< data transfers in binary mode */
SESSION_PASV = BIT(1), /*!< have pasv_addr ready for data transfer command */
SESSION_PORT = BIT(2), /*!< have peer_addr ready for data transfer command */
SESSION_RECV = BIT(3), /*!< data transfer in source mode */
SESSION_SEND = BIT(4), /*!< data transfer in sink mode */
SESSION_RENAME = BIT(5), /*!< last command was RNFR and buffer contains path */
SESSION_NLST = BIT(6), /*!< list command is NLST */
SESSION_URGENT = BIT(7), /*!< in telnet urgent mode */
} session_flags_t;
/*! ftp session */
struct ftp_session_t
{
char cwd[4096]; /*!< current working directory */
char lwd[4096]; /*!< list working directory */
struct sockaddr_in peer_addr; /*!< peer address for data connection */
struct sockaddr_in pasv_addr; /*!< listen address for PASV connection */
int cmd_fd; /*!< socket for command connection */
int pasv_fd; /*!< listen socket for PASV */
int data_fd; /*!< socket for data transfer */
time_t timestamp; /*!< time from last command */
session_flags_t flags; /*!< session flags */
session_state_t state; /*!< session state */
ftp_session_t *next; /*!< link to next session */
ftp_session_t *prev; /*!< link to prev session */
loop_status_t (*transfer)(ftp_session_t*); /*! data transfer callback */
char buffer[XFER_BUFFERSIZE]; /*! persistent data between callbacks */
char tmp_buffer[XFER_BUFFERSIZE]; /*! persistent data between callbacks */
char file_buffer[FILE_BUFFERSIZE]; /*! stdio file buffer */
char cmd_buffer[CMD_BUFFERSIZE]; /*! command buffer */
size_t bufferpos; /*! persistent buffer position between callbacks */
size_t buffersize; /*! persistent buffer size between callbacks */
size_t cmd_buffersize;
uint64_t filepos; /*! persistent file position between callbacks */
uint64_t filesize; /*! persistent file size between callbacks */
FILE *fp; /*! persistent open file pointer between callbacks */
DIR *dp; /*! persistent open directory pointer between callbacks */
};
/*! ftp command descriptor */
typedef struct ftp_command
{
const char *name; /*!< command name */
int (*handler)(ftp_session_t*, const char*); /*!< command callback */
} ftp_command_t;
/*! ftp command list */
static ftp_command_t ftp_commands[] =
{
/*! ftp command */
#define FTP_COMMAND(x) { #x, x, }
/*! ftp alias */
#define FTP_ALIAS(x,y) { #x, y, }
FTP_COMMAND(ABOR),
FTP_COMMAND(ALLO),
FTP_COMMAND(APPE),
FTP_COMMAND(CDUP),
FTP_COMMAND(CWD),
FTP_COMMAND(DELE),
FTP_COMMAND(FEAT),
FTP_COMMAND(HELP),
FTP_COMMAND(LIST),
FTP_COMMAND(MDTM),
FTP_COMMAND(MKD),
FTP_COMMAND(MODE),
FTP_COMMAND(NLST),
FTP_COMMAND(NOOP),
FTP_COMMAND(OPTS),
FTP_COMMAND(PASS),
FTP_COMMAND(PASV),
FTP_COMMAND(PORT),
FTP_COMMAND(PWD),
FTP_COMMAND(QUIT),
FTP_COMMAND(REST),
FTP_COMMAND(RETR),
FTP_COMMAND(RMD),
FTP_COMMAND(RNFR),
FTP_COMMAND(RNTO),
FTP_COMMAND(STAT),
FTP_COMMAND(STOR),
FTP_COMMAND(STOU),
FTP_COMMAND(STRU),
FTP_COMMAND(SYST),
FTP_COMMAND(TYPE),
FTP_COMMAND(USER),
FTP_ALIAS(XCUP, CDUP),
FTP_ALIAS(XCWD, CWD),
FTP_ALIAS(XMKD, MKD),
FTP_ALIAS(XPWD, PWD),
FTP_ALIAS(XRMD, RMD),
};
/*! number of ftp commands */
static const size_t num_ftp_commands = sizeof(ftp_commands)/sizeof(ftp_commands[0]);
/*! compare ftp command descriptors
*
* @param[in] p1 left side of comparison (ftp_command_t*)
* @param[in] p2 right side of comparison (ftp_command_t*)
*
* @returns <0 if p1 < p2
* @returns 0 if p1 == p2
* @returns >0 if p1 > p2
*/
static int
ftp_command_cmp(const void *p1,
const void *p2)
{
ftp_command_t *c1 = (ftp_command_t*)p1;
ftp_command_t *c2 = (ftp_command_t*)p2;
/* ordered by command name */
return strcasecmp(c1->name, c2->name);
}
#ifdef _3DS
/*! SOC service buffer */
static u32 *SOCU_buffer = NULL;
#endif
/*! server listen address */
static struct sockaddr_in serv_addr;
/*! listen file descriptor */
static int listenfd = -1;
#ifdef _3DS
/*! current data port */
static in_port_t data_port = DATA_PORT;
#endif
/*! list of ftp sessions */
static ftp_session_t *sessions = NULL;
/*! socket buffersize */
static int sock_buffersize = SOCK_BUFFERSIZE;
/*! server start time */
static time_t start_time = 0;
/*! Allocate a new data port
*
* @returns next data port
*/
static in_port_t
next_data_port(void)
{
#ifdef _3DS
if(++data_port >= 10000)
data_port = DATA_PORT;
return data_port;
#else
return 0; /* ephemeral port */
#endif
}
/*! set a socket to non-blocking
*
* @param[in] fd socket
*
* @returns error
*/
static int
ftp_set_socket_nonblocking(int fd)
{
int rc, flags;
/* get the socket flags */
flags = fcntl(fd, F_GETFL, 0);
if(flags == -1)
{
console_print(RED "fcntl: %d %s\n" RESET, errno, strerror(errno));
return -1;
}
/* add O_NONBLOCK to the socket flags */
rc = fcntl(fd, F_SETFL, flags | O_NONBLOCK);
if(rc != 0)
{
console_print(RED "fcntl: %d %s\n" RESET, errno, strerror(errno));
return -1;
}
return 0;
}
/*! set socket options
*
* @param[in] fd socket
*
* @returns failure
*/
static int
ftp_set_socket_options(int fd)
{
int rc;
/* increase receive buffer size */
rc = setsockopt(fd, SOL_SOCKET, SO_RCVBUF,
&sock_buffersize, sizeof(sock_buffersize));
if(rc != 0)
{
console_print(RED "setsockopt: SO_RCVBUF %d %s\n" RESET, errno, strerror(errno));
return -1;
}
/* increase send buffer size */
rc = setsockopt(fd, SOL_SOCKET, SO_SNDBUF,
&sock_buffersize, sizeof(sock_buffersize));
if(rc != 0)
{
console_print(RED "setsockopt: SO_SNDBUF %d %s\n" RESET, errno, strerror(errno));
return -1;
}
return 0;
}
/*! close a socket
*
* @param[in] fd socket to close
* @param[in] connected whether this socket is connected
*/
static void
ftp_closesocket(int fd,
bool connected)
{
int rc;
struct sockaddr_in addr;
socklen_t addrlen = sizeof(addr);
struct pollfd pollinfo;
if(connected)
{
/* get peer address and print */
rc = getpeername(fd, (struct sockaddr*)&addr, &addrlen);
if(rc != 0)
{
console_print(RED "getpeername: %d %s\n" RESET, errno, strerror(errno));
console_print(YELLOW "closing connection to fd=%d\n" RESET, fd);
}
else
console_print(YELLOW "closing connection to %s:%u\n" RESET,
inet_ntoa(addr.sin_addr), ntohs(addr.sin_port));
/* shutdown connection */
rc = shutdown(fd, SHUT_WR);
if(rc != 0)
console_print(RED "shutdown: %d %s\n" RESET, errno, strerror(errno));
/* wait for client to close connection */
pollinfo.fd = fd;
pollinfo.events = POLLIN;
pollinfo.revents = 0;
rc = poll(&pollinfo, 1, 250);
if(rc < 0)
console_print(RED "poll: %d %s\n" RESET, errno, strerror(errno));
}
/* close socket */
rc = close(fd);
if(rc != 0)
console_print(RED "close: %d %s\n" RESET, errno, strerror(errno));
}
/*! close command socket on ftp session
*
* @param[in] session ftp session
*/
static void
ftp_session_close_cmd(ftp_session_t *session)
{
/* close command socket */
if(session->cmd_fd >= 0)
ftp_closesocket(session->cmd_fd, true);
session->cmd_fd = -1;
}
/*! close listen socket on ftp session
*
* @param[in] session ftp session
*/
static void
ftp_session_close_pasv(ftp_session_t *session)
{
/* close pasv socket */
if(session->pasv_fd >= 0)
{
console_print(YELLOW "stop listening on %s:%u\n" RESET,
inet_ntoa(session->pasv_addr.sin_addr),
ntohs(session->pasv_addr.sin_port));
ftp_closesocket(session->pasv_fd, false);
}
session->pasv_fd = -1;
}
/*! close data socket on ftp session
*
* @param[in] session ftp session
*/
static void
ftp_session_close_data(ftp_session_t *session)
{
/* close data connection */
if(session->data_fd >= 0 && session->data_fd != session->cmd_fd)
ftp_closesocket(session->data_fd, true);
session->data_fd = -1;
/* clear send/recv flags */
session->flags &= ~(SESSION_RECV|SESSION_SEND);
}
/*! close open file for ftp session
*
* @param[in] session ftp session
*/
static void
ftp_session_close_file(ftp_session_t *session)
{
int rc;
if(session->fp != NULL)
{
rc = fclose(session->fp);
if(rc != 0)
console_print(RED "fclose: %d %s\n" RESET, errno, strerror(errno));
}
session->fp = NULL;
session->filepos = 0;
}
/*! open file for reading for ftp session
*
* @param[in] session ftp session
*
* @returns -1 for error
*/
static int
ftp_session_open_file_read(ftp_session_t *session)
{
int rc;
struct stat st;
/* open file in read mode */
session->fp = fopen(session->buffer, "rb");
if(session->fp == NULL)
{
console_print(RED "fopen '%s': %d %s\n" RESET, session->buffer, errno, strerror(errno));
return -1;
}
/* it's okay if this fails */
errno = 0;
rc = setvbuf(session->fp, session->file_buffer, _IOFBF, FILE_BUFFERSIZE);
if(rc != 0)
{
console_print(RED "setvbuf: %d %s\n" RESET, errno, strerror(errno));
}
/* get the file size */
rc = fstat(fileno(session->fp), &st);
if(rc != 0)
{
console_print(RED "fstat '%s': %d %s\n" RESET, session->buffer, errno, strerror(errno));
return -1;
}
session->filesize = st.st_size;
if(session->filepos != 0)
{
rc = fseek(session->fp, session->filepos, SEEK_SET);
if(rc != 0)
{
console_print(RED "fseek '%s': %d %s\n" RESET, session->buffer, errno, strerror(errno));
return -1;
}
}
return 0;
}
/*! read from an open file for ftp session
*
* @param[in] session ftp session
*
* @returns bytes read
*/
static ssize_t
ftp_session_read_file(ftp_session_t *session)
{
ssize_t rc;
/* read file at current position */
rc = fread(session->buffer, 1, sizeof(session->buffer), session->fp);
if(rc < 0)
{
console_print(RED "fread: %d %s\n" RESET, errno, strerror(errno));
return -1;
}
/* adjust file position */
session->filepos += rc;
return rc;
}
/*! open file for writing for ftp session
*
* @param[in] session ftp session
* @param[in] append whether to append
*
* @returns -1 for error
*
* @note truncates file
*/
static int
ftp_session_open_file_write(ftp_session_t *session,
bool append)
{
int rc;
const char *mode = "wb";
if(append)
mode = "ab";
else if(session->filepos != 0)
mode = "r+b";
/* open file in write mode */
session->fp = fopen(session->buffer, mode);
if(session->fp == NULL)
{
console_print(RED "fopen '%s': %d %s\n" RESET, session->buffer, errno, strerror(errno));
return -1;
}
/* it's okay if this fails */
errno = 0;
rc = setvbuf(session->fp, session->file_buffer, _IOFBF, FILE_BUFFERSIZE);
if(rc != 0)
{
console_print(RED "setvbuf: %d %s\n" RESET, errno, strerror(errno));
}
/* check if this had REST but not APPE */
if(session->filepos != 0 && !append)
{
/* seek to the REST offset */
rc = fseek(session->fp, session->filepos, SEEK_SET);
if(rc != 0)
{
console_print(RED "fseek '%s': %d %s\n" RESET, session->buffer, errno, strerror(errno));
return -1;
}
}
return 0;
}
/*! write to an open file for ftp session
*
* @param[in] session ftp session
*
* @returns bytes written
*/
static ssize_t
ftp_session_write_file(ftp_session_t *session)
{
ssize_t rc;
/* write to file at current position */
rc = fwrite(session->buffer + session->bufferpos,
1, session->buffersize - session->bufferpos,
session->fp);
if(rc < 0)
{
console_print(RED "fwrite: %d %s\n" RESET, errno, strerror(errno));
return -1;
}
else if(rc == 0)
console_print(RED "fwrite: wrote 0 bytes\n" RESET);
/* adjust file position */
session->filepos += rc;
return rc;
}
/*! close current working directory for ftp session
*
* @param[in] session ftp session
*/
static void
ftp_session_close_cwd(ftp_session_t *session)
{
int rc;
/* close open directory pointer */
if(session->dp != NULL)
{
rc = closedir(session->dp);
if(rc != 0)
console_print(RED "closedir: %d %s\n" RESET, errno, strerror(errno));
}
session->dp = NULL;
}
/*! open current working directory for ftp session
*
* @param[in] session ftp session
*
* @return -1 for failure
*/
static int
ftp_session_open_cwd(ftp_session_t *session)
{
/* open current working directory */
session->dp = opendir(session->cwd);
if(session->dp == NULL)
{
console_print(RED "opendir '%s': %d %s\n" RESET, session->cwd, errno, strerror(errno));
return -1;
}
return 0;
}
/*! set state for ftp session
*
* @param[in] session ftp session
* @param[in] state state to set
* @param[in] flags flags
*/
static void
ftp_session_set_state(ftp_session_t *session,
session_state_t state,
set_state_flags_t flags)
{
session->state = state;
/* close pasv and data sockets */
if(flags & CLOSE_PASV)
ftp_session_close_pasv(session);
if(flags & CLOSE_DATA)
ftp_session_close_data(session);
if(state == COMMAND_STATE)
{
/* close file/cwd */
ftp_session_close_file(session);
ftp_session_close_cwd(session);
}
}
/*! transfer loop
*
* Try to transfer as much data as the sockets will allow without blocking
*
* @param[in] session ftp session
*/
static void
ftp_session_transfer(ftp_session_t *session)
{
int rc;
do
{
rc = session->transfer(session);
} while(rc == 0);
}
/*! encode a path
*
* @param[in] path path to encode
* @param[in,out] len path length
* @param[in] quotes whether to encode quotes
*
* @returns encoded path
*
* @note The caller must free the returned path
*/
static char*
encode_path(const char *path,
size_t *len,
bool quotes)
{
bool enc = false;
size_t i, diff = 0;
char *out, *p = (char*)path;
/* check for \n that needs to be encoded */
if(memchr(p, '\n', *len) != NULL)
enc = true;
if(quotes)
{
/* check for " that needs to be encoded */
p = (char*)path;
do
{
p = memchr(p, '"', path + *len - p);
if(p != NULL)
{
++p;
++diff;
}
} while(p != NULL);
}
/* check if an encode was needed */
if(!enc && diff == 0)
return strdup(path);
/* allocate space for encoded path */
p = out = (char*)malloc(*len + diff);
if(out == NULL)
return NULL;
/* copy the path while performing encoding */
for(i = 0; i < *len; ++i)
{
if(*path == '\n')
{
/* encoded \n is \0 */
*p++ = 0;
}
else if(quotes && *path == '"')
{
/* encoded " is "" */
*p++ = '"';
*p++ = '"';
}
else
*p++ = *path;
++path;
}
*len += diff;
return out;
}
/*! decode a path
*
* @param[in] session ftp session
* @param[in] len command length
*/
static void
decode_path(ftp_session_t *session,
size_t len)
{
size_t i;
/* decode \0 from the first command */
for(i = 0; i < len; ++i)
{
/* this is an encoded \n */
if(session->cmd_buffer[i] == 0)
session->cmd_buffer[i] = '\n';
}
}
/*! send a response on the command socket
*
* @param[in] session ftp session
* @param[in] buffer buffer to send
* @param[in] len buffer length
*
* @returns bytes sent to peer
*/
static ssize_t
ftp_send_response_buffer(ftp_session_t *session,
const char *buffer,
size_t len)
{
ssize_t rc, to_send;
/* send response */
to_send = len;
console_print(GREEN "%s" RESET, buffer);
rc = send(session->cmd_fd, buffer, to_send, 0);
if(rc < 0)
console_print(RED "send: %d %s\n" RESET, errno, strerror(errno));
else if(rc != to_send)
console_print(RED "only sent %u/%u bytes\n" RESET,
(unsigned int)rc, (unsigned int)to_send);
return rc;
}
__attribute__((format(printf,3,4)))
/*! send ftp response to ftp session's peer
*
* @param[in] session ftp session
* @param[in] code response code
* @param[in] fmt format string
* @param[in] ... format arguments
*
* returns bytes sent to peer
*/
static ssize_t
ftp_send_response(ftp_session_t *session,
int code,
const char *fmt, ...)
{
static char buffer[CMD_BUFFERSIZE];
ssize_t rc;
va_list ap;
/* print response code and message to buffer */
va_start(ap, fmt);
if(code > 0)
rc = sprintf(buffer, "%d ", code);
else
rc = sprintf(buffer, "%d-", -code);
rc += vsnprintf(buffer+rc, sizeof(buffer)-rc, fmt, ap);
va_end(ap);
if(rc >= sizeof(buffer))
{
/* couldn't fit message; just send code */
console_print(RED "%s: buffersize too small\n" RESET, __func__);
if(code > 0)
rc = sprintf(buffer, "%d \r\n", code);
else
rc = sprintf(buffer, "%d-\r\n", -code);
}
return ftp_send_response_buffer(session, buffer, rc);
}
/*! destroy ftp session
*
* @param[in] session ftp session
*
* @returns the next session in the list
*/
static ftp_session_t*
ftp_session_destroy(ftp_session_t *session)
{
ftp_session_t *next = session->next;
/* close all sockets/files */
ftp_session_close_cmd(session);
ftp_session_close_pasv(session);
ftp_session_close_data(session);
ftp_session_close_file(session);
ftp_session_close_cwd(session);
/* unlink from sessions list */
if(session->next)
session->next->prev = session->prev;
if(session == sessions)
sessions = session->next;
else
{
session->prev->next = session->next;
if(session == sessions->prev)
sessions->prev = session->prev;
}
/* deallocate */
free(session);
return next;
}
/*! allocate new ftp session
*
* @param[in] listen_fd socket to accept connection from
*/
static void
ftp_session_new(int listen_fd)
{
ssize_t rc;
int new_fd;
ftp_session_t *session;
struct sockaddr_in addr;
socklen_t addrlen = sizeof(addr);
char host[NI_MAXHOST+1];
char serv[NI_MAXSERV+1];
/* accept connection */
new_fd = accept(listen_fd, (struct sockaddr*)&addr, &addrlen);
if(new_fd < 0)
{
console_print(RED "accept: %d %s\n" RESET, errno, strerror(errno));
return;
}
memset(host, 0, sizeof(host));
memset(serv, 0, sizeof(serv));
/* reverse dns lookup */
rc = getnameinfo((struct sockaddr*)&addr, addrlen,
host, sizeof(host), serv, sizeof(serv), 0);
if(rc != 0)
console_print(CYAN "accepted connection from %s:%u\n" RESET,
inet_ntoa(addr.sin_addr), ntohs(addr.sin_port));
else
console_print(CYAN "accepted connection from %s:%s\n" RESET,
host, serv);
/* allocate a new session */
session = (ftp_session_t*)calloc(1, sizeof(ftp_session_t));
if(session == NULL)
{
console_print(RED "failed to allocate session\n" RESET);
ftp_closesocket(new_fd, true);
return;
}
/* initialize session */
strcpy(session->cwd, "/");
session->peer_addr.sin_addr.s_addr = INADDR_ANY;
session->cmd_fd = new_fd;
session->pasv_fd = -1;
session->data_fd = -1;
session->state = COMMAND_STATE;
/* link to the sessions list */
if(sessions == NULL)
{
sessions = session;
session->prev = session;
}
else
{
sessions->prev->next = session;
session->prev = sessions->prev;
sessions->prev = session;
}
/* copy socket address to pasv address */
addrlen = sizeof(session->pasv_addr);
rc = getsockname(new_fd, (struct sockaddr*)&session->pasv_addr, &addrlen);
if(rc != 0)
{
console_print(RED "getsockname: %d %s\n" RESET, errno, strerror(errno));
ftp_send_response(session, 451, "Failed to get connection info\r\n");
ftp_session_destroy(session);
return;
}
session->cmd_fd = new_fd;
/* send initiator response */
rc = ftp_send_response(session, 220, "Hello!\r\n");
if(rc <= 0)
ftp_session_destroy(session);
}
/*! accept PASV connection for ftp session
*
* @param[in] session ftp session
*
* @returns -1 for failure
*/
static int
ftp_session_accept(ftp_session_t *session)
{
int rc, new_fd;
struct sockaddr_in addr;
socklen_t addrlen = sizeof(addr);
if(session->flags & SESSION_PASV)
{
/* clear PASV flag */
session->flags &= ~SESSION_PASV;
/* tell the peer that we're ready to accept the connection */
ftp_send_response(session, 150, "Ready\r\n");
/* accept connection from peer */
new_fd = accept(session->pasv_fd, (struct sockaddr*)&addr, &addrlen);
if(new_fd < 0)
{
console_print(RED "accept: %d %s\n" RESET, errno, strerror(errno));
ftp_session_set_state(session, COMMAND_STATE, CLOSE_PASV | CLOSE_DATA);
ftp_send_response(session, 425, "Failed to establish connection\r\n");
return -1;
}
/* set the socket to non-blocking */
rc = ftp_set_socket_nonblocking(new_fd);
if(rc != 0)
{
ftp_closesocket(new_fd, true);
ftp_session_set_state(session, COMMAND_STATE, CLOSE_PASV | CLOSE_DATA);
ftp_send_response(session, 425, "Failed to establish connection\r\n");
return -1;
}
console_print(CYAN "accepted connection from %s:%u\n" RESET,
inet_ntoa(addr.sin_addr), ntohs(addr.sin_port));
/* we are ready to transfer data */
ftp_session_set_state(session, DATA_TRANSFER_STATE, CLOSE_PASV);
session->data_fd = new_fd;
return 0;
}
else
{
/* peer didn't send PASV command */
ftp_send_response(session, 503, "Bad sequence of commands\r\n");
return -1;
}
}
/*! connect to peer for ftp session
*
* @param[in] session ftp session
*
* @returns -1 for failure
*/
static int
ftp_session_connect(ftp_session_t *session)
{
int rc;
/* clear PORT flag */
session->flags &= ~SESSION_PORT;
/* create a new socket */
session->data_fd = socket(AF_INET, SOCK_STREAM, 0);
if(session->data_fd < 0)
{
console_print(RED "socket: %d %s\n" RESET, errno, strerror(errno));
return -1;
}
/* set socket options */
rc = ftp_set_socket_options(session->data_fd);
if(rc != 0)
{
ftp_closesocket(session->data_fd, false);
session->data_fd = -1;
return -1;
}
/* connect to peer */
rc = connect(session->data_fd, (struct sockaddr*)&session->peer_addr,
sizeof(session->peer_addr));
if(rc != 0)
{
console_print(RED "connect: %d %s\n" RESET, errno, strerror(errno));
ftp_closesocket(session->data_fd, false);
session->data_fd = -1;
return -1;
}
/* set socket to non-blocking */
rc = ftp_set_socket_nonblocking(session->data_fd);
if(rc != 0)
return -1;
console_print(CYAN "connected to %s:%u\n" RESET,
inet_ntoa(session->peer_addr.sin_addr),
ntohs(session->peer_addr.sin_port));
return 0;
}
/*! read command for ftp session
*
* @param[in] session ftp session
* @param[in] events poll events
*/
static void
ftp_session_read_command(ftp_session_t *session,
int events)
{
char *buffer, *args, *next = NULL;
size_t i, len;
int atmark;
ssize_t rc;
ftp_command_t key, *command;
/* check out-of-band data */
if(events & POLLPRI)
{
session->flags |= SESSION_URGENT;
/* check if we are at the urgent marker */
atmark = sockatmark(session->cmd_fd);
if(atmark < 0)
{
console_print(RED "sockatmark: %d %s\n" RESET, errno, strerror(errno));
ftp_session_close_cmd(session);
return;
}
if(!atmark)
{
/* discard in-band data */
rc = recv(session->cmd_fd, session->cmd_buffer, sizeof(session->cmd_buffer), 0);
if(rc < 0 && errno != EWOULDBLOCK)
{
console_print(RED "recv: %d %s\n" RESET, errno, strerror(errno));
ftp_session_close_cmd(session);
}
return;
}
/* retrieve the urgent data */
rc = recv(session->cmd_fd, session->cmd_buffer, sizeof(session->cmd_buffer), MSG_OOB);
if(rc < 0)
{
/* EWOULDBLOCK means out-of-band data is on the way */
if(errno == EWOULDBLOCK)
return;
/* error retrieving out-of-band data */
console_print(RED "recv (oob): %d %s\n" RESET, errno, strerror(errno));
ftp_session_close_cmd(session);
return;
}
/* reset the command buffer */
session->cmd_buffersize = 0;
return;
}
/* prepare to receive data */
buffer = session->cmd_buffer + session->cmd_buffersize;
len = sizeof(session->cmd_buffer) - session->cmd_buffersize;
if(len == 0)
{
/* error retrieving command */
console_print(RED "Exceeded command buffer size\n" RESET);
ftp_session_close_cmd(session);
return;
}
/* retrieve command data */
rc = recv(session->cmd_fd, buffer, len, 0);
if(rc < 0)
{
/* error retrieving command */
console_print(RED "recv: %d %s\n" RESET, errno, strerror(errno));
ftp_session_close_cmd(session);
return;
}
if(rc == 0)
{
/* peer closed connection */
ftp_session_close_cmd(session);
return;
}
else
{
session->cmd_buffersize += rc;
len = sizeof(session->cmd_buffer) - session->cmd_buffersize;
if(session->flags & SESSION_URGENT)
{
/* look for telnet data mark */
for(i = 0; i < session->cmd_buffersize; ++i)
{
if((unsigned char)session->cmd_buffer[i] == 0xF2)
{
/* ignore all data that precedes the data mark */
if(i < session->cmd_buffersize - 1)
memmove(session->cmd_buffer, session->cmd_buffer + i + 1, len - i - 1);
session->cmd_buffersize -= i + 1;
session->flags &= ~SESSION_URGENT;
break;
}
}
}
/* loop through commands */
while(true)
{
/* must have at least enough data for the delimiter */
if(session->cmd_buffersize < 1)
return;
/* look for \r\n or \n delimiter */
for(i = 0; i < session->cmd_buffersize; ++i)
{
if(i < session->cmd_buffersize-1
&& session->cmd_buffer[i] == '\r'
&& session->cmd_buffer[i+1] == '\n')
{
/* we found a \r\n delimiter */
session->cmd_buffer[i] = 0;
next = &session->cmd_buffer[i+2];
break;
}
else if(session->cmd_buffer[i] == '\n')
{
/* we found a \n delimiter */
session->cmd_buffer[i] = 0;
next = &session->cmd_buffer[i+1];
break;
}
}
/* check if a delimiter was found */
if(i == session->cmd_buffersize)
return;
/* decode the command */
decode_path(session, i);
/* split command from arguments */
args = buffer = session->cmd_buffer;
while(*args && !isspace((int)*args))
++args;
if(*args)
*args++ = 0;
/* look up the command */
key.name = buffer;
command = bsearch(&key, ftp_commands,
num_ftp_commands, sizeof(ftp_command_t),
ftp_command_cmp);
/* update command timestamp */
session->timestamp = time(NULL);
/* execute the command */
if(command == NULL)
{
/* send header */
ftp_send_response(session, 502, "Invalid command \"");
/* send command */
len = strlen(buffer);
buffer = encode_path(buffer, &len, false);
if(buffer != NULL)
ftp_send_response_buffer(session, buffer, len);
else
ftp_send_response_buffer(session, key.name, strlen(key.name));
free(buffer);
/* send args (if any) */
if(*args != 0)
{
len = strlen(args);
buffer = encode_path(args, &len, false);
if(buffer != NULL)
ftp_send_response_buffer(session, buffer, len);
else
ftp_send_response_buffer(session, args, strlen(args));
free(buffer);
}
/* send footer */
ftp_send_response_buffer(session, "\"\r\n", 3);
}
else if(session->state != COMMAND_STATE)
{
/* only some commands are available during data transfer */
if(strcasecmp(command->name, "ABOR") != 0
&& strcasecmp(command->name, "STAT") != 0
&& strcasecmp(command->name, "QUIT") != 0)
{
ftp_send_response(session, 503, "Invalid command during transfer\r\n");
ftp_session_set_state(session, COMMAND_STATE, CLOSE_PASV | CLOSE_DATA);
ftp_session_close_cmd(session);
}
else
command->handler(session, args);
}
else
{
/* clear RENAME flag for all commands except RNTO */
if(strcasecmp(command->name, "RNTO") != 0)
session->flags &= ~SESSION_RENAME;
command->handler(session, args);
}
/* remove executed command from the command buffer */
len = session->cmd_buffer + session->cmd_buffersize - next;
if(len > 0)
memmove(session->cmd_buffer, next, len);
session->cmd_buffersize = len;
}
}
}
/*! poll sockets for ftp session
*
* @param[in] session ftp session
*
* @returns next session
*/
static ftp_session_t*
ftp_session_poll(ftp_session_t *session)
{
int rc;
struct pollfd pollinfo[2];
nfds_t nfds = 1;
/* the first pollfd is the command socket */
pollinfo[0].fd = session->cmd_fd;
pollinfo[0].events = POLLIN | POLLPRI;
pollinfo[0].revents = 0;
switch(session->state)
{
case COMMAND_STATE:
/* we are waiting to read a command */
break;
case DATA_CONNECT_STATE:
/* we are waiting for a PASV connection */
pollinfo[1].fd = session->pasv_fd;
pollinfo[1].events = POLLIN;
pollinfo[1].revents = 0;
nfds = 2;
break;
case DATA_TRANSFER_STATE:
/* we need to transfer data */
pollinfo[1].fd = session->data_fd;
if(session->flags & SESSION_RECV)
pollinfo[1].events = POLLIN;
else
pollinfo[1].events = POLLOUT;
pollinfo[1].revents = 0;
nfds = 2;
break;
}
/* poll the selected sockets */
rc = poll(pollinfo, nfds, 0);
if(rc < 0)
{
console_print(RED "poll: %d %s\n" RESET, errno, strerror(errno));
ftp_session_close_cmd(session);
}
else if(rc > 0)
{
/* check the command socket */
if(pollinfo[0].revents != 0)
{
/* handle command */
if(pollinfo[0].revents & POLL_UNKNOWN)
console_print(YELLOW "cmd_fd: revents=0x%08X\n" RESET, pollinfo[0].revents);
/* we need to read a new command */
if(pollinfo[0].revents & (POLLERR|POLLHUP))
ftp_session_close_cmd(session);
else if(pollinfo[0].revents & (POLLIN | POLLPRI))
ftp_session_read_command(session, pollinfo[0].revents);
}
/* check the data/pasv socket */
if(nfds > 1 && pollinfo[1].revents != 0)
{
switch(session->state)
{
case COMMAND_STATE:
/* this shouldn't happen? */
break;
case DATA_CONNECT_STATE:
if(pollinfo[1].revents & POLL_UNKNOWN)
console_print(YELLOW "pasv_fd: revents=0x%08X\n" RESET, pollinfo[1].revents);
/* we need to accept the PASV connection */
if(pollinfo[1].revents & (POLLERR|POLLHUP))
{
ftp_session_set_state(session, COMMAND_STATE, CLOSE_PASV | CLOSE_DATA);
ftp_send_response(session, 426, "Data connection failed\r\n");
}
else if(pollinfo[1].revents & POLLIN)
{
if(ftp_session_accept(session) != 0)
ftp_session_set_state(session, COMMAND_STATE, CLOSE_PASV | CLOSE_DATA);
}
break;
case DATA_TRANSFER_STATE:
if(pollinfo[1].revents & POLL_UNKNOWN)
console_print(YELLOW "data_fd: revents=0x%08X\n" RESET, pollinfo[1].revents);
/* we need to transfer data */
if(pollinfo[1].revents & (POLLERR|POLLHUP))
{
ftp_session_set_state(session, COMMAND_STATE, CLOSE_PASV | CLOSE_DATA);
ftp_send_response(session, 426, "Data connection failed\r\n");
}
else if(pollinfo[1].revents & (POLLIN|POLLOUT))
ftp_session_transfer(session);
break;
}
}
}
/* still connected to peer; return next session */
if(session->cmd_fd >= 0)
return session->next;
/* disconnected from peer; destroy it and return next session */
return ftp_session_destroy(session);
}
/*! initialize ftp subsystem */
int
ftp_init(void)
{
int rc;
start_time = time(NULL);
#ifdef _3DS
Result ret = 0;
u32 wifi = 0;
bool loop;
console_print(GREEN "Waiting for wifi...\n" RESET);
/* wait for wifi to be available */
while((loop = aptMainLoop()) && !wifi && (ret == 0 || ret == 0xE0A09D2E))
{
ret = 0;
hidScanInput();
if(hidKeysDown() & KEY_B)
{
/* user canceled */
loop = false;
break;
}
/* update the wifi status */
ret = ACU_GetWifiStatus(&wifi);
if(ret != 0)
wifi = 0;
}
/* check if there was a wifi error */
if(ret != 0)
console_print(RED "ACU_GetWifiStatus returns 0x%lx\n" RESET, ret);
/* check if we need to exit */
if(!loop || ret != 0)
return -1;
console_print(GREEN "Ready!\n" RESET);
#ifdef ENABLE_LOGGING
/* open log file */
FILE *fp = freopen("/ftpd.log", "wb", stderr);
if(fp == NULL)
{
console_print(RED "freopen: 0x%08X\n" RESET, errno);
goto log_fail;
}
/* truncate log file */
if(ftruncate(fileno(fp), 0) != 0)
{
console_print(RED "ftruncate: 0x%08X\n" RESET, errno);
goto ftruncate_fail;
}
#endif
/* allocate buffer for SOC service */
SOCU_buffer = (u32*)memalign(SOCU_ALIGN, SOCU_BUFFERSIZE);
if(SOCU_buffer == NULL)
{
console_print(RED "memalign: failed to allocate\n" RESET);
goto memalign_fail;
}
/* initialize SOC service */
ret = socInit(SOCU_buffer, SOCU_BUFFERSIZE);
if(ret != 0)
{
console_print(RED "socInit: 0x%08X\n" RESET, (unsigned int)ret);
goto soc_fail;
}
#endif
/* allocate socket to listen for clients */
listenfd = socket(AF_INET, SOCK_STREAM, 0);
if(listenfd < 0)
{
console_print(RED "socket: %d %s\n" RESET, errno, strerror(errno));
ftp_exit();
return -1;
}
/* get address to listen on */
serv_addr.sin_family = AF_INET;
#ifdef _3DS
serv_addr.sin_addr.s_addr = gethostid();
serv_addr.sin_port = htons(LISTEN_PORT);
#else
serv_addr.sin_addr.s_addr = INADDR_ANY;
serv_addr.sin_port = htons(LISTEN_PORT);
#endif
/* reuse address */
{
int yes = 1;
rc = setsockopt(listenfd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes));
if(rc != 0)
{
console_print(RED "setsockopt: %d %s\n" RESET, errno, strerror(errno));
ftp_exit();
return -1;
}
}
/* bind socket to listen address */
rc = bind(listenfd, (struct sockaddr*)&serv_addr, sizeof(serv_addr));
if(rc != 0)
{
console_print(RED "bind: %d %s\n" RESET, errno, strerror(errno));
ftp_exit();
return -1;
}
/* listen on socket */
rc = listen(listenfd, 5);
if(rc != 0)
{
console_print(RED "listen: %d %s\n" RESET, errno, strerror(errno));
ftp_exit();
return -1;
}
/* print server address */
#ifdef _3DS
console_set_status("\n" GREEN STATUS_STRING " "
YELLOW "IP:" CYAN "%s "
YELLOW "Port:" CYAN "%u"
RESET,
inet_ntoa(serv_addr.sin_addr),
ntohs(serv_addr.sin_port));
#else
{
char hostname[128];
socklen_t addrlen = sizeof(serv_addr);
rc = getsockname(listenfd, (struct sockaddr*)&serv_addr, &addrlen);
if(rc != 0)
{
console_print(RED "getsockname: %d %s\n" RESET, errno, strerror(errno));
ftp_exit();
return -1;
}
rc = gethostname(hostname, sizeof(hostname));
if(rc != 0)
{
console_print(RED "gethostname: %d %s\n" RESET, errno, strerror(errno));
ftp_exit();
return -1;
}
console_set_status(GREEN STATUS_STRING " "
YELLOW "IP:" CYAN "%s "
YELLOW "Port:" CYAN "%u"
RESET,
hostname,
ntohs(serv_addr.sin_port));
}
#endif
return 0;
#ifdef _3DS
soc_fail:
free(SOCU_buffer);
SOCU_buffer = NULL;
memalign_fail:
#ifdef ENABLE_LOGGING
ftruncate_fail:
if(fclose(stderr) != 0)
console_print(RED "fclose: 0x%08X\n" RESET, errno);
log_fail:
#endif
return -1;
#endif
}
/*! deinitialize ftp subsystem */
void
ftp_exit(void)
{
#ifdef _3DS
Result ret;
#endif
/* clean up all sessions */
while(sessions != NULL)
ftp_session_destroy(sessions);
/* stop listening for new clients */
if(listenfd >= 0)
ftp_closesocket(listenfd, false);
#ifdef _3DS
/* deinitialize SOC service */
console_render();
console_print(CYAN "Waiting for socExit()...\n" RESET);
if(SOCU_buffer != NULL)
{
ret = socExit();
if(ret != 0)
console_print(RED "socExit: 0x%08X\n" RESET, (unsigned int)ret);
free(SOCU_buffer);
}
#ifdef ENABLE_LOGGING
/* close log file */
if(fclose(stderr) != 0)
console_print(RED "fclose: 0x%08X\n" RESET, errno);
#endif
#endif
}
/*! ftp look
*
* @returns whether to keep looping
*/
loop_status_t
ftp_loop(void)
{
int rc;
struct pollfd pollinfo;
ftp_session_t *session;
/* we will poll for new client connections */
pollinfo.fd = listenfd;
pollinfo.events = POLLIN;
pollinfo.revents = 0;
/* poll for a new client */
rc = poll(&pollinfo, 1, 0);
if(rc < 0)
{
/* wifi got disabled */
if(errno == ENETDOWN)
return LOOP_RESTART;
console_print(RED "poll: %d %s\n" RESET, errno, strerror(errno));
return LOOP_EXIT;
}
else if(rc > 0)
{
if(pollinfo.revents & POLLIN)
{
/* we got a new client */
ftp_session_new(listenfd);
}
else
{
console_print(YELLOW "listenfd: revents=0x%08X\n" RESET, pollinfo.revents);
}
}
/* poll each session */
session = sessions;
while(session != NULL)
session = ftp_session_poll(session);
#ifdef _3DS
/* check if the user wants to exit */
hidScanInput();
if(hidKeysDown() & KEY_B)
return LOOP_EXIT;
#endif
return LOOP_CONTINUE;
}
/*! change to parent directory
*
* @param[in] session ftp session
*/
static void
cd_up(ftp_session_t *session)
{
char *slash = NULL, *p;
/* remove basename from cwd */
for(p = session->cwd; *p; ++p)
{
if(*p == '/')
slash = p;
}
*slash = 0;
if(strlen(session->cwd) == 0)
strcat(session->cwd, "/");
}
/*! validate a path
*
* @param[in] args path to validate
*/
static int
validate_path(const char *args)
{
const char *p;
/* make sure no path components are '..' */
p = args;
while((p = strstr(p, "/..")) != NULL)
{
if(p[3] == 0 || p[3] == '/')
return -1;
}
/* make sure there are no '//' */
if(strstr(args, "//") != NULL)
return -1;
return 0;
}
/*! get a path relative to cwd
*
* @param[in] session ftp session
* @param[in] cwd working directory
* @param[in] args path to make
*
* @returns error
*
* @note the output goes to session->buffer
*/
static int
build_path(ftp_session_t *session,
const char *cwd,
const char *args)
{
int rc;
char *p;
memset(session->buffer, 0, sizeof(session->buffer));
/* make sure the input is a valid path */
if(validate_path(args) != 0)
{
errno = EINVAL;
return -1;
}
if(args[0] == '/')
{
/* this is an absolute path */
if(strlen(args) > sizeof(session->buffer)-1)
{
errno = ENAMETOOLONG;
return -1;
}
strncpy(session->buffer, args, sizeof(session->buffer));
}
else
{
/* this is a relative path */
if(strcmp(cwd, "/") == 0)
rc = snprintf(session->buffer, sizeof(session->buffer), "/%s",
args);
else
rc = snprintf(session->buffer, sizeof(session->buffer), "%s/%s",
cwd, args);
if(rc >= sizeof(session->buffer))
{
errno = ENAMETOOLONG;
return -1;
}
}
/* remove trailing / */
p = session->buffer + strlen(session->buffer);
while(p > session->buffer && *--p == '/')
*p = 0;
/* if we ended with an empty path, it is the root directory */
if(strlen(session->buffer) == 0)
strcpy(session->buffer, "/");
return 0;
}
/*! transfer a directory listing
*
* @param[in] session ftp session
*
* @returns whether to call again
*/
static loop_status_t
list_transfer(ftp_session_t *session)
{
ssize_t rc;
size_t len;
uint64_t mtime;
time_t t_mtime;
struct tm *tm;
char *buffer;
struct stat st;
struct dirent *dent;
/* check if we sent all available data */
if(session->bufferpos == session->buffersize)
{
/* check if this was a STAT */
if(session->data_fd == session->cmd_fd)
rc = 213;
else
rc = 226;
/* check if this was for a file */
if(session->dp == NULL)
{
/* we already sent the file's listing */
ftp_session_set_state(session, COMMAND_STATE, CLOSE_PASV | CLOSE_DATA);
ftp_send_response(session, rc, "OK\r\n");
return LOOP_EXIT;
}
/* get the next directory entry */
dent = readdir(session->dp);
if(dent == NULL)
{
/* we have exhausted the directory listing */
ftp_session_set_state(session, COMMAND_STATE, CLOSE_PASV | CLOSE_DATA);
ftp_send_response(session, rc, "OK\r\n");
return LOOP_EXIT;
}
/* TODO I think we are supposed to return entries for . and .. */
if(strcmp(dent->d_name, ".") == 0 || strcmp(dent->d_name, "..") == 0)
return LOOP_CONTINUE;
/* check if this was a NLST */
if(session->flags & SESSION_NLST)
{
/* NLST gives the whole path name */
session->buffersize = 0;
if(build_path(session, session->lwd, dent->d_name) == 0)
{
/* encode \n in path */
len = strlen(session->buffer);
buffer = encode_path(session->buffer, &len, false);
if(buffer != NULL)
{
/* copy to the session buffer to send */
memcpy(session->buffer, buffer, len);
free(buffer);
session->buffer[len++] = '\r';
session->buffer[len++] = '\n';
session->buffersize = len;
}
}
}
else
{
#ifdef _3DS
/* the sdmc directory entry already has the type and size, so no need to do a slow stat */
u32 magic = *(u32*)session->dp->dirData->dirStruct;
if(magic == SDMC_DIRITER_MAGIC)
{
sdmc_dir_t *dir = (sdmc_dir_t*)session->dp->dirData->dirStruct;
FS_DirectoryEntry *entry = &dir->entry_data[dir->index];
if(entry->attributes & FS_ATTRIBUTE_DIRECTORY)
st.st_mode = S_IFDIR | S_IRUSR | S_IRGRP | S_IROTH;
else
st.st_mode = S_IFREG | S_IRUSR | S_IRGRP | S_IROTH;
if(!(entry->attributes & FS_ATTRIBUTE_READ_ONLY))
st.st_mode |= S_IWUSR | S_IWGRP | S_IWOTH;
st.st_size = entry->fileSize;
if((rc = build_path(session, session->lwd, dent->d_name)) != 0)
console_print(RED "build_path: %d %s\n" RESET, errno, strerror(errno));
else if((rc = sdmc_getmtime(session->buffer, &mtime)) != 0)
{
console_print(RED "sdmc_getmtime '%s': 0x%x\n" RESET, session->buffer, rc);
mtime = 0;
}
}
else
{
/* lstat the entry */
if((rc = build_path(session, session->lwd, dent->d_name)) != 0)
console_print(RED "build_path: %d %s\n" RESET, errno, strerror(errno));
else if((rc = lstat(session->buffer, &st)) != 0)
console_print(RED "stat '%s': %d %s\n" RESET, session->buffer, errno, strerror(errno));
if(rc != 0)
{
/* an error occurred */
ftp_session_set_state(session, COMMAND_STATE, CLOSE_PASV | CLOSE_DATA);
ftp_send_response(session, 550, "unavailable\r\n");
return LOOP_EXIT;
}
mtime = st.st_mtime;
}
#else
/* lstat the entry */
if((rc = build_path(session, session->lwd, dent->d_name)) != 0)
console_print(RED "build_path: %d %s\n" RESET, errno, strerror(errno));
else if((rc = lstat(session->buffer, &st)) != 0)
console_print(RED "stat '%s': %d %s\n" RESET, session->buffer, errno, strerror(errno));
if(rc != 0)
{
/* an error occurred */
ftp_session_set_state(session, COMMAND_STATE, CLOSE_PASV | CLOSE_DATA);
ftp_send_response(session, 550, "unavailable\r\n");
return LOOP_EXIT;
}
mtime = st.st_mtime;
#endif
/* encode \n in path */
len = strlen(dent->d_name);
buffer = encode_path(dent->d_name, &len, false);
if(buffer != NULL)
{
/* copy to the session buffer to send */
session->buffersize =
sprintf(session->buffer,
"%c%c%c%c%c%c%c%c%c%c 1 3DS 3DS %lld ",
S_ISREG(st.st_mode) ? '-' :
S_ISDIR(st.st_mode) ? 'd' :
S_ISLNK(st.st_mode) ? 'l' :
S_ISCHR(st.st_mode) ? 'c' :
S_ISBLK(st.st_mode) ? 'b' :
S_ISFIFO(st.st_mode) ? 'p' :
S_ISSOCK(st.st_mode) ? 's' : '?',
st.st_mode & S_IRUSR ? 'r' : '-',
st.st_mode & S_IWUSR ? 'w' : '-',
st.st_mode & S_IXUSR ? 'x' : '-',
st.st_mode & S_IRGRP ? 'r' : '-',
st.st_mode & S_IWGRP ? 'w' : '-',
st.st_mode & S_IXGRP ? 'x' : '-',
st.st_mode & S_IROTH ? 'r' : '-',
st.st_mode & S_IWOTH ? 'w' : '-',
st.st_mode & S_IXOTH ? 'x' : '-',
(signed long long)st.st_size);
t_mtime = mtime;
tm = gmtime(&t_mtime);
if(tm != NULL)
{
const char *fmt = "%b %e %Y ";
if(session->timestamp > mtime && session->timestamp - mtime < (60*60*24*365/2))
fmt = "%b %e %H:%M ";
session->buffersize +=
strftime(session->buffer + session->buffersize,
sizeof(session->buffer) - session->buffersize,
fmt, tm);
}
else
{
session->buffersize +=
sprintf(session->buffer + session->buffersize, "Jan 1 1970 ");
}
if(session->buffersize + len + 2 > sizeof(session->buffer))
{
/* buffer will overflow */
free(buffer);
ftp_session_set_state(session, COMMAND_STATE, CLOSE_PASV | CLOSE_DATA);
ftp_send_response(session, 425, "%s\r\n", strerror(EOVERFLOW));
return LOOP_EXIT;
}
memcpy(session->buffer+session->buffersize, buffer, len);
free(buffer);
len = session->buffersize + len;
session->buffer[len++] = '\r';
session->buffer[len++] = '\n';
session->buffersize = len;
}
else
session->buffersize = 0;
}
session->bufferpos = 0;
}
/* send any pending data */
rc = send(session->data_fd, session->buffer + session->bufferpos,
session->buffersize - session->bufferpos, 0);
if(rc <= 0)
{
/* error sending data */
if(rc < 0)
{
if(errno == EWOULDBLOCK)
return LOOP_EXIT;
console_print(RED "send: %d %s\n" RESET, errno, strerror(errno));
}
else
console_print(YELLOW "send: %d %s\n" RESET, ECONNRESET, strerror(ECONNRESET));
ftp_session_set_state(session, COMMAND_STATE, CLOSE_PASV | CLOSE_DATA);
ftp_send_response(session, 426, "Connection broken during transfer\r\n");
return LOOP_EXIT;
}
/* we can try to send more data */
session->bufferpos += rc;
return LOOP_CONTINUE;
}
/*! send a file to the client
*
* @param[in] session ftp session
*
* @returns whether to call again
*/
static loop_status_t
retrieve_transfer(ftp_session_t *session)
{
ssize_t rc;
if(session->bufferpos == session->buffersize)
{
/* we have sent all the data so read some more */
rc = ftp_session_read_file(session);
if(rc <= 0)
{
/* can't read any more data */
ftp_session_set_state(session, COMMAND_STATE, CLOSE_PASV | CLOSE_DATA);
if(rc < 0)
ftp_send_response(session, 451, "Failed to read file\r\n");
else
ftp_send_response(session, 226, "OK\r\n");
return LOOP_EXIT;
}
/* we read some data so reset the session buffer to send */
session->bufferpos = 0;
session->buffersize = rc;
}
/* send any pending data */
rc = send(session->data_fd, session->buffer + session->bufferpos,
session->buffersize - session->bufferpos, 0);
if(rc <= 0)
{
/* error sending data */
if(rc < 0)
{
if(errno == EWOULDBLOCK)
return LOOP_EXIT;
console_print(RED "send: %d %s\n" RESET, errno, strerror(errno));
}
else
console_print(YELLOW "send: %d %s\n" RESET, ECONNRESET, strerror(ECONNRESET));
ftp_session_set_state(session, COMMAND_STATE, CLOSE_PASV | CLOSE_DATA);
ftp_send_response(session, 426, "Connection broken during transfer\r\n");
return LOOP_EXIT;
}
/* we can try to send more data */
session->bufferpos += rc;
return LOOP_CONTINUE;
}
/*! send a file to the client
*
* @param[in] session ftp session
*
* @returns whether to call again
*/
static loop_status_t
store_transfer(ftp_session_t *session)
{
ssize_t rc;
if(session->bufferpos == session->buffersize)
{
/* we have written all the received data, so try to get some more */
rc = recv(session->data_fd, session->buffer, sizeof(session->buffer), 0);
if(rc <= 0)
{
/* can't read any more data */
if(rc < 0)
{
if(errno == EWOULDBLOCK)
return LOOP_EXIT;
console_print(RED "recv: %d %s\n" RESET, errno, strerror(errno));
}
ftp_session_set_state(session, COMMAND_STATE, CLOSE_PASV | CLOSE_DATA);
if(rc == 0)
ftp_send_response(session, 226, "OK\r\n");
else
ftp_send_response(session, 426, "Connection broken during transfer\r\n");
return LOOP_EXIT;
}
/* we received some data so reset the session buffer to write */
session->bufferpos = 0;
session->buffersize = rc;
}
rc = ftp_session_write_file(session);
if(rc <= 0)
{
/* error writing data */
ftp_session_set_state(session, COMMAND_STATE, CLOSE_PASV | CLOSE_DATA);
ftp_send_response(session, 451, "Failed to write file\r\n");
return LOOP_EXIT;
}
/* we can try to receive more data */
session->bufferpos += rc;
return LOOP_CONTINUE;
}
/*! ftp_xfer_file mode */
typedef enum
{
XFER_FILE_RETR, /*!< Retrieve a file */
XFER_FILE_STOR, /*!< Store a file */
XFER_FILE_APPE, /*!< Append a file */
} xfer_file_mode_t;
/*! Transfer a file
*
* @param[in] session ftp session
* @param[in] args ftp arguments
* @param[in] mode transfer mode
*
* @returns failure
*/
static int
ftp_xfer_file(ftp_session_t *session,
const char *args,
xfer_file_mode_t mode)
{
int rc;
/* build the path of the file to transfer */
if(build_path(session, session->cwd, args) != 0)
{
rc = errno;
ftp_session_set_state(session, COMMAND_STATE, CLOSE_PASV | CLOSE_DATA);
return ftp_send_response(session, 553, "%s\r\n", strerror(rc));
}
/* open the file for retrieving or storing */
if(mode == XFER_FILE_RETR)
rc = ftp_session_open_file_read(session);
else
rc = ftp_session_open_file_write(session, mode == XFER_FILE_APPE);
if(rc != 0)
{
/* error opening the file */
ftp_session_set_state(session, COMMAND_STATE, CLOSE_PASV | CLOSE_DATA);
return ftp_send_response(session, 450, "failed to open file\r\n");
}
if(session->flags & SESSION_PORT)
{
/* connect to the client */
ftp_session_set_state(session, DATA_TRANSFER_STATE, CLOSE_PASV);
rc = ftp_session_connect(session);
if(rc != 0)
{
/* error connecting */
ftp_session_set_state(session, COMMAND_STATE, CLOSE_PASV | CLOSE_DATA);
return ftp_send_response(session, 425, "can't open data connection\r\n");
}
/* set up the transfer */
session->flags &= ~(SESSION_RECV|SESSION_SEND);
if(mode == XFER_FILE_RETR)
{
session->flags |= SESSION_SEND;
session->transfer = retrieve_transfer;
}
else
{
session->flags |= SESSION_RECV;
session->transfer = store_transfer;
}
session->bufferpos = 0;
session->buffersize = 0;
return ftp_send_response(session, 150, "Ready\r\n");
}
else if(session->flags & SESSION_PASV)
{
/* set up the transfer */
session->flags &= ~(SESSION_RECV|SESSION_SEND);
if(mode == XFER_FILE_RETR)
{
session->flags |= SESSION_SEND;
session->transfer = retrieve_transfer;
}
else
{
session->flags |= SESSION_RECV;
session->transfer = store_transfer;
}
session->bufferpos = 0;
session->buffersize = 0;
ftp_session_set_state(session, DATA_CONNECT_STATE, CLOSE_DATA);
return 0;
}
ftp_session_set_state(session, COMMAND_STATE, CLOSE_PASV | CLOSE_DATA);
return ftp_send_response(session, 503, "Bad sequence of commands\r\n");
}
/*! ftp_xfer_dir mode */
typedef enum
{
XFER_DIR_LIST, /*!< Long list */
XFER_DIR_NLST, /*!< Short list */
XFER_DIR_STAT, /*!< Stat command */
} xfer_dir_mode_t;
/*! Transfer a directory
*
* @param[in] session ftp session
* @param[in] args ftp arguments
* @param[in] mode transfer mode
* @param[in] workaround whether to workaround LIST -a
*
* @returns failure
*/
static int
ftp_xfer_dir(ftp_session_t *session,
const char *args,
xfer_dir_mode_t mode,
bool workaround)
{
ssize_t rc;
size_t len;
struct stat st;
const char *base;
char *buffer;
/* set up the transfer */
session->flags &= ~(SESSION_RECV|SESSION_NLST);
session->flags |= SESSION_SEND;
session->transfer = list_transfer;
session->buffersize = 0;
session->bufferpos = 0;
if(strlen(args) > 0)
{
/* an argument was provided */
if(build_path(session, session->cwd, args) != 0)
{
/* error building path */
ftp_session_set_state(session, COMMAND_STATE, CLOSE_PASV | CLOSE_DATA);
return ftp_send_response(session, 550, "%s\r\n", strerror(errno));
}
/* check if this is a directory */
session->dp = opendir(session->buffer);
if(session->dp == NULL)
{
/* not a directory; check if it is a file */
rc = stat(session->buffer, &st);
if(rc != 0)
{
/* error getting stat */
rc = errno;
/* work around broken clients that think LIST -a is a thing */
if(workaround && mode == XFER_DIR_LIST)
{
if(args[0] == '-' && args[1] == 'a')
{
if(args[2] == 0)
buffer = strdup(args+2);
else
buffer = strdup(args+3);
if(buffer != NULL)
{
rc = ftp_xfer_dir(session, buffer, mode, false);
free(buffer);
return rc;
}
rc = ENOMEM;
}
}
ftp_session_set_state(session, COMMAND_STATE, CLOSE_PASV | CLOSE_DATA);
return ftp_send_response(session, 550, "%s\r\n", strerror(rc));
}
else
{
/* get the base name */
base = strrchr(session->buffer, '/') + 1;
/* encode \n in path */
len = strlen(base);
buffer = encode_path(base, &len, false);
if(buffer != NULL)
{
/* copy to the session buffer to send */
session->buffersize =
sprintf(session->buffer,
"-rwxrwxrwx 1 3DS 3DS %lld Jan 1 1970 ",
(signed long long)st.st_size);
if(session->buffersize + len + 2 > sizeof(session->buffer))
{
/* buffer will overflow */
free(buffer);
ftp_session_set_state(session, COMMAND_STATE, CLOSE_PASV | CLOSE_DATA);
ftp_send_response(session, 425, "%s\r\n", strerror(EOVERFLOW));
return LOOP_EXIT;
}
memcpy(session->buffer + session->buffersize, buffer, len);
free(buffer);
len = session->buffersize + len;
session->buffer[len++] = '\r';
session->buffer[len++] = '\n';
session->buffersize = len;
}
else
session->buffersize = 0;
}
}
else
{
/* it was a directory, so set it as the lwd */
strcpy(session->lwd, session->buffer);
}
}
else if(ftp_session_open_cwd(session) != 0)
{
/* no argument, but opening cwd failed */
ftp_session_set_state(session, COMMAND_STATE, CLOSE_PASV | CLOSE_DATA);
return ftp_send_response(session, 550, "%s\r\n", strerror(errno));
}
else
{
/* set the lwd as the cwd */
strcpy(session->lwd, session->cwd);
}
if(session->flags & SESSION_PORT)
{
/* connect to the client */
ftp_session_set_state(session, DATA_TRANSFER_STATE, CLOSE_PASV);
rc = ftp_session_connect(session);
if(rc != 0)
{
ftp_session_set_state(session, COMMAND_STATE, CLOSE_PASV | CLOSE_DATA);
return ftp_send_response(session, 425, "can't open data connection\r\n");
}
/* set up the transfer */
if(mode == XFER_DIR_NLST)
session->flags |= SESSION_NLST;
else if(mode != XFER_DIR_LIST)
{
ftp_session_set_state(session, COMMAND_STATE, CLOSE_PASV | CLOSE_DATA);
return ftp_send_response(session, 503, "Bad sequence of commands\r\n");
}
return ftp_send_response(session, 150, "Ready\r\n");
}
else if(session->flags & SESSION_PASV)
{
/* set up the transfer */
if(mode == XFER_DIR_NLST)
session->flags |= SESSION_NLST;
else if(mode != XFER_DIR_LIST)
{
ftp_session_set_state(session, COMMAND_STATE, CLOSE_PASV | CLOSE_DATA);
return ftp_send_response(session, 503, "Bad sequence of commands\r\n");
}
ftp_session_set_state(session, DATA_CONNECT_STATE, CLOSE_DATA);
return 0;
}
else if(mode == XFER_DIR_STAT)
{
/* this is a little different; we have to send the data over the command socket */
ftp_session_set_state(session, DATA_TRANSFER_STATE, CLOSE_PASV | CLOSE_DATA);
session->data_fd = session->cmd_fd;
session->flags |= SESSION_SEND;
return ftp_send_response(session, -213, "Status\r\n");
}
/* we must have got LIST or NLST without a preceding PORT or PASV */
ftp_session_set_state(session, COMMAND_STATE, CLOSE_PASV | CLOSE_DATA);
return ftp_send_response(session, 503, "Bad sequence of commands\r\n");
}
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* *
* F T P C O M M A N D S *
* *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/*! @fn static int ABOR(ftp_session_t *session, const char *args)
*
* @brief abort a transfer
*
* @param[in] session ftp session
* @param[in] args arguments
*
* @returns error
*/
FTP_DECLARE(ABOR)
{
console_print(CYAN "%s %s\n" RESET, __func__, args ? args : "");
if(session->state == COMMAND_STATE)
return ftp_send_response(session, 225, "No transfer to abort\r\n");
/* abort the transfer */
ftp_session_set_state(session, COMMAND_STATE, CLOSE_PASV | CLOSE_DATA);
/* send response for this request */
ftp_send_response(session, 225, "Aborted\r\n");
/* send response for transfer */
return ftp_send_response(session, 425, "Transfer aborted\r\n");
}
/*! @fn static int ALLO(ftp_session_t *session, const char *args)
*
* @brief allocate space
*
* @param[in] session ftp session
* @param[in] args arguments
*
* @returns error
*/
FTP_DECLARE(ALLO)
{
console_print(CYAN "%s %s\n" RESET, __func__, args ? args : "");
ftp_session_set_state(session, COMMAND_STATE, 0);
return ftp_send_response(session, 202, "superfluous command\r\n");
}
/*! @fn static int APPE(ftp_session_t *session, const char *args)
*
* @brief append data to a file
*
* @note requires a PASV or PORT connection
*
* @param[in] session ftp session
* @param[in] args arguments
*
* @returns error
*/
FTP_DECLARE(APPE)
{
console_print(CYAN "%s %s\n" RESET, __func__, args ? args : "");
/* open the file in append mode */
return ftp_xfer_file(session, args, XFER_FILE_APPE);
}
/*! @fn static int CDUP(ftp_session_t *session, const char *args)
*
* @brief CWD to parent directory
*
* @param[in] session ftp session
* @param[in] args arguments
*
* @returns error
*/
FTP_DECLARE(CDUP)
{
console_print(CYAN "%s %s\n" RESET, __func__, args ? args : "");
ftp_session_set_state(session, COMMAND_STATE, 0);
/* change to parent directory */
cd_up(session);
return ftp_send_response(session, 200, "OK\r\n");
}
/*! @fn static int CWD(ftp_session_t *session, const char *args)
*
* @brief change working directory
*
* @param[in] session ftp session
* @param[in] args arguments
*
* @returns error
*/
FTP_DECLARE(CWD)
{
struct stat st;
int rc;
console_print(CYAN "%s %s\n" RESET, __func__, args ? args : "");
ftp_session_set_state(session, COMMAND_STATE, 0);
/* .. is equivalent to CDUP */
if(strcmp(args, "..") == 0)
{
cd_up(session);
return ftp_send_response(session, 200, "OK\r\n");
}
/* build the new cwd path */
if(build_path(session, session->cwd, args) != 0)
return ftp_send_response(session, 553, "%s\r\n", strerror(errno));
/* get the path status */
rc = stat(session->buffer, &st);
if(rc != 0)
{
console_print(RED "stat '%s': %d %s\n" RESET, session->buffer, errno, strerror(errno));
return ftp_send_response(session, 550, "unavailable\r\n");
}
/* make sure it is a directory */
if(!S_ISDIR(st.st_mode))
return ftp_send_response(session, 553, "not a directory\r\n");
/* copy the path into the cwd */
strncpy(session->cwd, session->buffer, sizeof(session->cwd));
return ftp_send_response(session, 200, "OK\r\n");
}
/*! @fn static int DELE(ftp_session_t *session, const char *args)
*
* @brief delete a file
*
* @param[in] session ftp session
* @param[in] args arguments
*
* @returns error
*/
FTP_DECLARE(DELE)
{
int rc;
console_print(CYAN "%s %s\n" RESET, __func__, args ? args : "");
ftp_session_set_state(session, COMMAND_STATE, 0);
/* build the file path */
if(build_path(session, session->cwd, args) != 0)
return ftp_send_response(session, 553, "%s\r\n", strerror(errno));
/* try to unlink the path */
rc = unlink(session->buffer);
if(rc != 0)
{
/* error unlinking the file */
console_print(RED "unlink: %d %s\n" RESET, errno, strerror(errno));
return ftp_send_response(session, 550, "failed to delete file\r\n");
}
return ftp_send_response(session, 250, "OK\r\n");
}
/*! @fn static int FEAT(ftp_session_t *session, const char *args)
*
* @brief list server features
*
* @param[in] session ftp session
* @param[in] args arguments
*
* @returns error
*/
FTP_DECLARE(FEAT)
{
console_print(CYAN "%s %s\n" RESET, __func__, args ? args : "");
ftp_session_set_state(session, COMMAND_STATE, 0);
/* list our features */
return ftp_send_response(session, -211, "\r\n"
" MDTM\r\n"
" UTF8\r\n"
"\r\n"
"211 End\r\n");
}
/*! @fn static int HELP(ftp_session_t *session, const char *args)
*
* @brief print server help
*
* @param[in] session ftp session
* @param[in] args arguments
*
* @returns error
*/
FTP_DECLARE(HELP)
{
console_print(CYAN "%s %s\n" RESET, __func__, args ? args : "");
ftp_session_set_state(session, COMMAND_STATE, 0);
/* list our accepted commands */
return ftp_send_response(session, -214,
"The following commands are recognized\r\n"
" ABOR ALLO APPE CDUP CWD DELE FEAT HELP LIST MDTM MKD MODE NLST NOOP\r\n"
" OPTS PASS PASV PORT PWD QUIT REST RETR RMD RNFR RNTO STAT STOR STOU\r\n"
" STRU SYST TYPE USER XCUP XCWD XMKD XPWD XRMD\r\n"
"214 End\r\n");
}
/*! @fn static int LIST(ftp_session_t *session, const char *args)
*
* @brief retrieve a directory listing
*
* @note Requires a PORT or PASV connection
*
* @param[in] session ftp session
* @param[in] args arguments
*
* @returns error
*/
FTP_DECLARE(LIST)
{
console_print(CYAN "%s %s\n" RESET, __func__, args ? args : "");
/* open the path in LIST mode */
return ftp_xfer_dir(session, args, XFER_DIR_LIST, true);
}
/*! @fn static int MDTM(ftp_session_t *session, const char *args)
*
* @brief get last modification time
*
* @param[in] session ftp session
* @param[in] args arguments
*
* @returns error
*/
FTP_DECLARE(MDTM)
{
int rc;
#ifdef _3DS
uint64_t mtime;
#else
struct stat st;
#endif
time_t t_mtime;
struct tm *tm;
console_print(CYAN "%s %s\n" RESET, __func__, args ? args : "");
ftp_session_set_state(session, COMMAND_STATE, 0);
/* build the path */
if(build_path(session, session->cwd, args) != 0)
return ftp_send_response(session, 553, "%s\r\n", strerror(errno));
#ifdef _3DS
rc = sdmc_getmtime(session->buffer, &mtime);
if(rc != 0)
return ftp_send_response(session, 550, "Error getting mtime\r\n");
t_mtime = mtime;
#else
rc = stat(session->buffer, &st);
if(rc != 0)
return ftp_send_response(session, 550, "Error getting mtime\r\n");
t_mtime = st.st_mtime;
#endif
tm = gmtime(&t_mtime);
if(tm == NULL)
return ftp_send_response(session, 550, "Error getting mtime\r\n");
session->buffersize = strftime(session->buffer, sizeof(session->buffer), "%Y%m%d%H%M%S", tm);
if(session->buffersize == 0)
return ftp_send_response(session, 550, "Error getting mtime\r\n");
session->buffer[session->buffersize] = 0;
return ftp_send_response(session, 213, "%s\r\n", session->buffer);
}
/*! @fn static int MKD(ftp_session_t *session, const char *args)
*
* @brief create a directory
*
* @param[in] session ftp session
* @param[in] args arguments
*
* @returns error
*/
FTP_DECLARE(MKD)
{
int rc;
console_print(CYAN "%s %s\n" RESET, __func__, args ? args : "");
ftp_session_set_state(session, COMMAND_STATE, 0);
/* build the path */
if(build_path(session, session->cwd, args) != 0)
return ftp_send_response(session, 553, "%s\r\n", strerror(errno));
/* try to create the directory */
rc = mkdir(session->buffer, 0755);
if(rc != 0 && errno != EEXIST)
{
/* mkdir failure */
console_print(RED "mkdir: %d %s\n" RESET, errno, strerror(errno));
return ftp_send_response(session, 550, "failed to create directory\r\n");
}
return ftp_send_response(session, 250, "OK\r\n");
}
/*! @fn static int MODE(ftp_session_t *session, const char *args)
*
* @brief set transfer mode
*
* @param[in] session ftp session
* @param[in] args arguments
*
* @returns error
*/
FTP_DECLARE(MODE)
{
console_print(CYAN "%s %s\n" RESET, __func__, args ? args : "");
ftp_session_set_state(session, COMMAND_STATE, 0);
/* we only accept S (stream) mode */
if(strcasecmp(args, "S") == 0)
return ftp_send_response(session, 200, "OK\r\n");
return ftp_send_response(session, 504, "unavailable\r\n");
}
/*! @fn static int NLST(ftp_session_t *session, const char *args)
*
* @brief retrieve a name list
*
* @note Requires a PASV or PORT connection
*
* @param[in] session ftp session
* @param[in] args arguments
*
* @returns error
*/
FTP_DECLARE(NLST)
{
console_print(CYAN "%s %s\n" RESET, __func__, args ? args : "");
/* open the path in NLST mode */
return ftp_xfer_dir(session, args, XFER_DIR_NLST, false);
}
/*! @fn static int NOOP(ftp_session_t *session, const char *args)
*
* @brief no-op
*
* @param[in] session ftp session
* @param[in] args arguments
*
* @returns error
*/
FTP_DECLARE(NOOP)
{
console_print(CYAN "%s %s\n" RESET, __func__, args ? args : "");
/* this is a no-op */
return ftp_send_response(session, 200, "OK\r\n");
}
/*! @fn static int OPTS(ftp_session_t *session, const char *args)
*
* @brief set options
*
* @param[in] session ftp session
* @param[in] args arguments
*
* @returns error
*/
FTP_DECLARE(OPTS)
{
console_print(CYAN "%s %s\n" RESET, __func__, args ? args : "");
ftp_session_set_state(session, COMMAND_STATE, 0);
/* we only accept the following options */
if(strcasecmp(args, "UTF8") == 0
|| strcasecmp(args, "UTF8 ON") == 0
|| strcasecmp(args, "UTF8 NLST") == 0)
return ftp_send_response(session, 200, "OK\r\n");
return ftp_send_response(session, 504, "invalid argument\r\n");
}
/*! @fn static int PASS(ftp_session_t *session, const char *args)
*
* @brief provide password
*
* @param[in] session ftp session
* @param[in] args arguments
*
* @returns error
*/
FTP_DECLARE(PASS)
{
console_print(CYAN "%s %s\n" RESET, __func__, args ? args : "");
/* we accept any password */
ftp_session_set_state(session, COMMAND_STATE, 0);
return ftp_send_response(session, 230, "OK\r\n");
}
/*! @fn static int PASV(ftp_session_t *session, const char *args)
*
* @brief request an address to connect to
*
* @param[in] session ftp session
* @param[in] args arguments
*
* @returns error
*/
FTP_DECLARE(PASV)
{
int rc;
char buffer[INET_ADDRSTRLEN + 10];
char *p;
in_port_t port;
console_print(CYAN "%s %s\n" RESET, __func__, args ? args : "");
memset(buffer, 0, sizeof(buffer));
/* reset the state */
ftp_session_set_state(session, COMMAND_STATE, CLOSE_PASV | CLOSE_DATA);
session->flags &= ~(SESSION_PASV|SESSION_PORT);
/* create a socket to listen on */
session->pasv_fd = socket(AF_INET, SOCK_STREAM, 0);
if(session->pasv_fd < 0)
{
console_print(RED "socket: %d %s\n" RESET, errno, strerror(errno));
return ftp_send_response(session, 451, "\r\n");
}
/* set the socket options */
rc = ftp_set_socket_options(session->pasv_fd);
if(rc != 0)
{
/* failed to set socket options */
ftp_session_close_pasv(session);
return ftp_send_response(session, 451, "\r\n");
}
/* grab a new port */
session->pasv_addr.sin_port = htons(next_data_port());
#ifdef _3DS
console_print(YELLOW "binding to %s:%u\n" RESET,
inet_ntoa(session->pasv_addr.sin_addr),
ntohs(session->pasv_addr.sin_port));
#endif
/* bind to the port */
rc = bind(session->pasv_fd, (struct sockaddr*)&session->pasv_addr,
sizeof(session->pasv_addr));
if(rc != 0)
{
/* failed to bind */
console_print(RED "bind: %d %s\n" RESET, errno, strerror(errno));
ftp_session_close_pasv(session);
return ftp_send_response(session, 451, "\r\n");
}
/* listen on the socket */
rc = listen(session->pasv_fd, 1);
if(rc != 0)
{
/* failed to listen */
console_print(RED "listen: %d %s\n" RESET, errno, strerror(errno));
ftp_session_close_pasv(session);
return ftp_send_response(session, 451, "\r\n");
}
#ifndef _3DS
{
/* get the socket address since we requested an ephemeral port */
socklen_t addrlen = sizeof(session->pasv_addr);
rc = getsockname(session->pasv_fd, (struct sockaddr*)&session->pasv_addr,
&addrlen);
if(rc != 0)
{
/* failed to get socket address */
console_print(RED "getsockname: %d %s\n" RESET, errno, strerror(errno));
ftp_session_close_pasv(session);
return ftp_send_response(session, 451, "\r\n");
}
}
#endif
/* we are now listening on the socket */
console_print(YELLOW "listening on %s:%u\n" RESET,
inet_ntoa(session->pasv_addr.sin_addr),
ntohs(session->pasv_addr.sin_port));
session->flags |= SESSION_PASV;
/* print the address in the ftp format */
port = ntohs(session->pasv_addr.sin_port);
strcpy(buffer, inet_ntoa(session->pasv_addr.sin_addr));
sprintf(buffer+strlen(buffer), ",%u,%u",
port >> 8, port & 0xFF);
for(p = buffer; *p; ++p)
{
if(*p == '.')
*p = ',';
}
return ftp_send_response(session, 227, "%s\r\n", buffer);
}
/*! @fn static int PORT(ftp_session_t *session, const char *args)
*
* @brief provide an address for the server to connect to
*
* @param[in] session ftp session
* @param[in] args arguments
*
* @returns error
*/
FTP_DECLARE(PORT)
{
char *addrstr, *p, *portstr;
int commas = 0, rc;
short port = 0;
unsigned long val;
struct sockaddr_in addr;
console_print(CYAN "%s %s\n" RESET, __func__, args ? args : "");
/* reset the state */
ftp_session_set_state(session, COMMAND_STATE, CLOSE_PASV | CLOSE_DATA);
session->flags &= ~(SESSION_PASV|SESSION_PORT);
/* dup the args since they are const and we need to change it */
addrstr = strdup(args);
if(addrstr == NULL)
return ftp_send_response(session, 425, "%s\r\n", strerror(ENOMEM));
/* replace a,b,c,d,e,f with a.b.c.d\0e.f */
for(p = addrstr; *p; ++p)
{
if(*p == ',')
{
if(commas != 3)
*p = '.';
else
{
*p = 0;
portstr = p+1;
}
++commas;
}
}
/* make sure we got the right number of values */
if(commas != 5)
{
free(addrstr);
return ftp_send_response(session, 501, "%s\r\n", strerror(EINVAL));
}
/* parse the address */
rc = inet_aton(addrstr, &addr.sin_addr);
if(rc == 0)
{
free(addrstr);
return ftp_send_response(session, 501, "%s\r\n", strerror(EINVAL));
}
/* parse the port */
val = 0;
port = 0;
for(p = portstr; *p; ++p)
{
if(!isdigit((int)*p))
{
if(p == portstr || *p != '.' || val > 0xFF)
{
free(addrstr);
return ftp_send_response(session, 501, "%s\r\n", strerror(EINVAL));
}
port <<= 8;
port += val;
val = 0;
}
else
{
val *= 10;
val += *p - '0';
}
}
/* validate the port */
if(val > 0xFF || port > 0xFF)
{
free(addrstr);
return ftp_send_response(session, 501, "%s\r\n", strerror(EINVAL));
}
port <<= 8;
port += val;
/* fill in the address port and family */
addr.sin_family = AF_INET;
addr.sin_port = htons(port);
free(addrstr);
memcpy(&session->peer_addr, &addr, sizeof(addr));
/* we are ready to connect to the client */
session->flags |= SESSION_PORT;
return ftp_send_response(session, 200, "OK\r\n");
}
/*! @fn static int PWD(ftp_session_t *session, const char *args)
*
* @brief print working directory
*
* @param[in] session ftp session
* @param[in] args arguments
*
* @returns error
*/
FTP_DECLARE(PWD)
{
static char buffer[CMD_BUFFERSIZE];
size_t len = sizeof(buffer), i;
char *path;
console_print(CYAN "%s %s\n" RESET, __func__, args ? args : "");
ftp_session_set_state(session, COMMAND_STATE, 0);
/* encode the cwd */
len = strlen(session->cwd);
path = encode_path(session->cwd, &len, true);
if(path != NULL)
{
i = sprintf(buffer, "257 \"");
if(i + len + 3 > sizeof(buffer))
{
/* buffer will overflow */
free(path);
ftp_session_set_state(session, COMMAND_STATE, CLOSE_PASV | CLOSE_DATA);
ftp_send_response(session, 550, "unavailable\r\n");
return ftp_send_response(session, 425, "%s\r\n", strerror(EOVERFLOW));
}
memcpy(buffer+i, path, len);
free(path);
len += i;
buffer[len++] = '"';
buffer[len++] = '\r';
buffer[len++] = '\n';
return ftp_send_response_buffer(session, buffer, len);
}
return ftp_send_response(session, 425, "%s\r\n", strerror(ENOMEM));
}
/*! @fn static int QUIT(ftp_session_t *session, const char *args)
*
* @brief terminate ftp session
*
* @param[in] session ftp session
* @param[in] args arguments
*
* @returns error
*/
FTP_DECLARE(QUIT)
{
console_print(CYAN "%s %s\n" RESET, __func__, args ? args : "");
/* disconnect from the client */
ftp_send_response(session, 221, "disconnecting\r\n");
ftp_session_close_cmd(session);
return 0;
}
/*! @fn static int REST(ftp_session_t *session, const char *args)
*
* @brief restart a transfer
*
* @note sets file position for a subsequent STOR operation
*
* @param[in] session ftp session
* @param[in] args arguments
*
* @returns error
*/
FTP_DECLARE(REST)
{
const char *p;
uint64_t pos = 0;
console_print(CYAN "%s %s\n" RESET, __func__, args ? args : "");
ftp_session_set_state(session, COMMAND_STATE, 0);
/* make sure an argument is provided */
if(args == NULL)
return ftp_send_response(session, 504, "invalid argument\r\n");
/* parse the offset */
for(p = args; *p; ++p)
{
if(!isdigit((int)*p))
return ftp_send_response(session, 504, "invalid argument\r\n");
if(UINT64_MAX / 10 < pos)
return ftp_send_response(session, 504, "invalid argument\r\n");
pos *= 10;
if(UINT64_MAX - (*p - '0') < pos)
return ftp_send_response(session, 504, "invalid argument\r\n");
pos += (*p - '0');
}
/* set the restart offset */
session->filepos = pos;
return ftp_send_response(session, 200, "OK\r\n");
}
/*! @fn static int RETR(ftp_session_t *session, const char *args)
*
* @brief retrieve a file
*
* @note Requires a PASV or PORT connection
*
* @param[in] session ftp session
* @param[in] args arguments
*
* @returns error
*/
FTP_DECLARE(RETR)
{
console_print(CYAN "%s %s\n" RESET, __func__, args ? args : "");
/* open the file to retrieve */
return ftp_xfer_file(session, args, XFER_FILE_RETR);
}
/*! @fn static int RMD(ftp_session_t *session, const char *args)
*
* @brief remove a directory
*
* @param[in] session ftp session
* @param[in] args arguments
*
* @returns error
*/
FTP_DECLARE(RMD)
{
int rc;
console_print(CYAN "%s %s\n" RESET, __func__, args ? args : "");
ftp_session_set_state(session, COMMAND_STATE, 0);
/* build the path to remove */
if(build_path(session, session->cwd, args) != 0)
return ftp_send_response(session, 553, "%s\r\n", strerror(errno));
/* remove the directory */
rc = rmdir(session->buffer);
if(rc != 0)
{
/* rmdir error */
console_print(RED "rmdir: %d %s\n" RESET, errno, strerror(errno));
return ftp_send_response(session, 550, "failed to delete directory\r\n");
}
return ftp_send_response(session, 250, "OK\r\n");
}
/*! @fn static int RNFR(ftp_session_t *session, const char *args)
*
* @brief rename from
*
* @note Must be followed by RNTO
*
* @param[in] session ftp session
* @param[in] args arguments
*
* @returns error
*/
FTP_DECLARE(RNFR)
{
int rc;
struct stat st;
console_print(CYAN "%s %s\n" RESET, __func__, args ? args : "");
ftp_session_set_state(session, COMMAND_STATE, 0);
/* build the path to rename from */
if(build_path(session, session->cwd, args) != 0)
return ftp_send_response(session, 553, "%s\r\n", strerror(errno));
/* make sure the path exists */
rc = lstat(session->buffer, &st);
if(rc != 0)
{
/* error getting path status */
console_print(RED "lstat: %d %s\n" RESET, errno, strerror(errno));
return ftp_send_response(session, 450, "no such file or directory\r\n");
}
/* we are ready for RNTO */
session->flags |= SESSION_RENAME;
return ftp_send_response(session, 350, "OK\r\n");
}
/*! @fn static int RNTO(ftp_session_t *session, const char *args)
*
* @brief rename to
*
* @note Must be preceded by RNFR
*
* @param[in] session ftp session
* @param[in] args arguments
*
* @returns error
*/
FTP_DECLARE(RNTO)
{
int rc;
console_print(CYAN "%s %s\n" RESET, __func__, args ? args : "");
ftp_session_set_state(session, COMMAND_STATE, 0);
/* make sure the previous command was RNFR */
if(!(session->flags & SESSION_RENAME))
return ftp_send_response(session, 503, "Bad sequence of commands\r\n");
/* clear the rename state */
session->flags &= ~SESSION_RENAME;
/* copy the RNFR path */
memcpy(session->tmp_buffer, session->buffer, XFER_BUFFERSIZE);
/* build the path to rename to */
if(build_path(session, session->cwd, args) != 0)
return ftp_send_response(session, 554, "%s\r\n", strerror(errno));
/* rename the file */
rc = rename(session->tmp_buffer, session->buffer);
if(rc != 0)
{
/* rename failure */
console_print(RED "rename: %d %s\n" RESET, errno, strerror(errno));
return ftp_send_response(session, 550, "failed to rename file/directory\r\n");
}
return ftp_send_response(session, 250, "OK\r\n");
}
/*! @fn static int STAT(ftp_session_t *session, const char *args)
*
* @brief get status
*
* @note If no argument is supplied, and a transfer is occurring, get the
* current transfer status. If no argument is supplied, and no transfer
* is occurring, get the server status. If an argument is supplied, this
* is equivalent to LIST, except the data is sent over the command
* socket.
*
* @param[in] session ftp session
* @param[in] args arguments
*
* @returns error
*/
FTP_DECLARE(STAT)
{
time_t uptime = time(NULL) - start_time;
int hours = uptime / 3600;
int minutes = (uptime / 60) % 60;
int seconds = uptime % 60;
console_print(CYAN "%s %s\n" RESET, __func__, args ? args : "");
if(session->state == DATA_CONNECT_STATE)
{
/* we are waiting to connect to the client */
return ftp_send_response(session, -211, "FTP server status\r\n"
" Waiting for data connection\r\n"
"211 End\r\n");
}
else if(session->state == DATA_TRANSFER_STATE)
{
/* we are in the middle of a transfer */
return ftp_send_response(session, -211, "FTP server status\r\n"
" Transferred %" PRIu64 " bytes\r\n"
"211 End\r\n",
session->filepos);
}
if(strlen(args) == 0)
{
/* no argument provided, send the server status */
return ftp_send_response(session, -211, "FTP server status\r\n"
" Uptime: %02d:%02d:%02d\r\n"
"211 End\r\n",
hours, minutes, seconds);
}
/* argument provided, open the path in STAT mode */
return ftp_xfer_dir(session, args, XFER_DIR_STAT, false);
}
/*! @fn static int STOR(ftp_session_t *session, const char *args)
*
* @brief store a file
*
* @note Requires a PASV or PORT connection
*
* @param[in] session ftp session
* @param[in] args arguments
*
* @returns error
*/
FTP_DECLARE(STOR)
{
console_print(CYAN "%s %s\n" RESET, __func__, args ? args : "");
/* open the file to store */
return ftp_xfer_file(session, args, XFER_FILE_STOR);
}
/*! @fn static int STOU(ftp_session_t *session, const char *args)
*
* @brief store a unique file
*
* @param[in] session ftp session
* @param[in] args arguments
*
* @returns error
*/
FTP_DECLARE(STOU)
{
console_print(CYAN "%s %s\n" RESET, __func__, args ? args : "");
/* we do not support this yet */
ftp_session_set_state(session, COMMAND_STATE, 0);
return ftp_send_response(session, 502, "unavailable\r\n");
}
/*! @fn static int STRU(ftp_session_t *session, const char *args)
*
* @brief set file structure
*
* @param[in] session ftp session
* @param[in] args arguments
*
* @returns error
*/
FTP_DECLARE(STRU)
{
console_print(CYAN "%s %s\n" RESET, __func__, args ? args : "");
ftp_session_set_state(session, COMMAND_STATE, 0);
/* we only support F (no structure) mode */
if(strcasecmp(args, "F") == 0)
return ftp_send_response(session, 200, "OK\r\n");
return ftp_send_response(session, 504, "unavailable\r\n");
}
/*! @fn static int SYST(ftp_session_t *session, const char *args)
*
* @brief identify system
*
* @param[in] session ftp session
* @param[in] args arguments
*
* @returns error
*/
FTP_DECLARE(SYST)
{
console_print(CYAN "%s %s\n" RESET, __func__, args ? args : "");
ftp_session_set_state(session, COMMAND_STATE, 0);
/* we are UNIX compliant with 8-bit characters */
return ftp_send_response(session, 215, "UNIX Type: L8\r\n");
}
/*! @fn static int TYPE(ftp_session_t *session, const char *args)
*
* @brief set transfer mode
*
* @note transfer mode is always binary
*
* @param[in] session ftp session
* @param[in] args arguments
*
* @returns error
*/
FTP_DECLARE(TYPE)
{
console_print(CYAN "%s %s\n" RESET, __func__, args ? args : "");
ftp_session_set_state(session, COMMAND_STATE, 0);
/* we always transfer in binary mode */
return ftp_send_response(session, 200, "OK\r\n");
}
/*! @fn static int USER(ftp_session_t *session, const char *args)
*
* @brief provide user name
*
* @param[in] session ftp session
* @param[in] args arguments
*
* @returns error
*/
FTP_DECLARE(USER)
{
console_print(CYAN "%s %s\n" RESET, __func__, args ? args : "");
ftp_session_set_state(session, COMMAND_STATE, 0);
/* we accept any user name */
return ftp_send_response(session, 230, "OK\r\n");
}
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