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ftpcmd.c
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ftpcmd.c
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/* FTP engine
*
* Copyright (c) 2014-2019 Joachim Nilsson <troglobit@gmail.com>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include "uftpd.h"
#include <ctype.h>
#include <arpa/ftp.h>
#ifdef HAVE_SYS_TIME_H
# include <sys/time.h>
#endif
typedef struct {
char *command;
void (*cb)(ctrl_t *ctr, char *arg);
} ftp_cmd_t;
static ftp_cmd_t supported[];
static void do_PORT(ctrl_t *ctrl, int pending);
static void do_LIST(uev_t *w, void *arg, int events);
static void do_RETR(uev_t *w, void *arg, int events);
static void do_STOR(uev_t *w, void *arg, int events);
static int is_cont(char *msg)
{
char *ptr;
ptr = strchr(msg, '\r');
if (ptr) {
ptr++;
if (strchr(ptr, '\r'))
return 1;
}
return 0;
}
static int send_msg(int sd, char *msg)
{
int n = 0;
int l;
if (!msg) {
err:
ERR(EINVAL, "Missing argument to send_msg()");
return 1;
}
l = strlen(msg);
if (l <= 0)
goto err;
while (n < l) {
int result = send(sd, msg + n, l, 0);
if (result < 0) {
ERR(errno, "Failed sending message to client");
return 1;
}
n += result;
}
DBG("Sent: %s%s", is_cont(msg) ? "\n" : "", msg);
return 0;
}
/*
* Receive message from client, split into command and argument
*/
static int recv_msg(int sd, char *msg, size_t len, char **cmd, char **argument)
{
char *ptr;
ssize_t bytes;
uint8_t *raw = (uint8_t *)msg;
/* Clear for every new command. */
memset(msg, 0, len);
/* Save one byte (-1) for NUL termination */
bytes = recv(sd, msg, len - 1, 0);
if (bytes < 0) {
if (EINTR == errno)
return 1;
if (ECONNRESET == errno)
DBG("Connection reset by client.");
else
ERR(errno, "Failed reading client command");
return 1;
}
if (!bytes) {
INFO("Client disconnected.");
return 1;
}
if (raw[0] == 0xff) {
char tmp[4];
char buf[20] = { 0 };
int i;
i = recv(sd, &msg[bytes], len - bytes - 1, MSG_OOB | MSG_DONTWAIT);
if (i > 0)
bytes += i;
for (i = 0; i < bytes; i++) {
snprintf(tmp, sizeof(tmp), "%2X%s", raw[i], i + 1 < bytes ? " " : "");
strlcat(buf, tmp, sizeof(buf));
}
strlcpy(msg, buf, len);
*cmd = msg;
*argument = NULL;
DBG("Recv: [%s], %d bytes", msg, bytes);
return 0;
}
/* NUL terminate for strpbrk() */
msg[bytes] = 0;
*cmd = msg;
ptr = strpbrk(msg, " ");
if (ptr) {
*ptr = 0;
ptr++;
*argument = ptr;
} else {
*argument = NULL;
ptr = msg;
}
ptr = strpbrk(ptr, "\r\n");
if (ptr)
*ptr = 0;
/* Convert command to std ftp upper case, issue #18 */
for (ptr = msg; *ptr; ++ptr) *ptr = toupper(*ptr);
DBG("Recv: %s %s", *cmd, *argument ?: "");
return 0;
}
static int open_data_connection(ctrl_t *ctrl)
{
socklen_t len = sizeof(struct sockaddr);
struct sockaddr_in sin;
/* Previous PORT command from client */
if (ctrl->data_address[0]) {
int rc;
ctrl->data_sd = socket(AF_INET, SOCK_STREAM | SOCK_NONBLOCK, 0);
if (-1 == ctrl->data_sd) {
ERR(errno, "Failed creating data socket");
return -1;
}
memset(&sin, 0, sizeof(sin));
sin.sin_family = AF_INET;
sin.sin_port = htons(ctrl->data_port);
inet_aton(ctrl->data_address, &(sin.sin_addr));
rc = connect(ctrl->data_sd, (struct sockaddr *)&sin, len);
if (rc == -1 && EINPROGRESS != errno) {
ERR(errno, "Failed connecting data socket to client");
close(ctrl->data_sd);
ctrl->data_sd = -1;
return -1;
}
DBG("Connected successfully to client's previously requested address:PORT %s:%d",
ctrl->data_address, ctrl->data_port);
return 0;
}
/* Previous PASV command, accept connect from client */
if (ctrl->data_listen_sd > 0) {
const int const_int_1 = 1;
int retries = 3;
char client_ip[100];
retry:
ctrl->data_sd = accept(ctrl->data_listen_sd, (struct sockaddr *)&sin, &len);
if (-1 == ctrl->data_sd) {
if (EAGAIN == errno && --retries) {
sleep(1);
goto retry;
}
ERR(errno, "Failed accepting connection from client");
return -1;
}
setsockopt(ctrl->data_sd, SOL_SOCKET, SO_KEEPALIVE, &const_int_1, sizeof(const_int_1));
set_nonblock(ctrl->data_sd);
inet_ntop(AF_INET, &(sin.sin_addr), client_ip, INET_ADDRSTRLEN);
DBG("Client PASV data connection from %s:%d", client_ip, ntohs(sin.sin_port));
close(ctrl->data_listen_sd);
ctrl->data_listen_sd = -1;
}
return 0;
}
static int close_data_connection(ctrl_t *ctrl)
{
int ret = 0;
DBG("Closing data connection ...");
/* PASV server listening socket */
if (ctrl->data_listen_sd > 0) {
shutdown(ctrl->data_listen_sd, SHUT_RDWR);
close(ctrl->data_listen_sd);
ctrl->data_listen_sd = -1;
ret++;
}
/* PASV client socket */
if (ctrl->data_sd > 0) {
shutdown(ctrl->data_sd, SHUT_RDWR);
close(ctrl->data_sd);
ctrl->data_sd = -1;
ret++;
}
/* PORT */
if (ctrl->data_address[0]) {
ctrl->data_address[0] = 0;
ctrl->data_port = 0;
}
return ret;
}
static int check_user_pass(ctrl_t *ctrl)
{
if (!ctrl->name[0])
return -1;
if (!strcmp("anonymous", ctrl->name))
return 1;
return 0;
}
static int do_abort(ctrl_t *ctrl)
{
if (ctrl->d || ctrl->d_num) {
uev_io_stop(&ctrl->data_watcher);
if (ctrl->d_num > 0)
free(ctrl->d);
ctrl->d_num = 0;
ctrl->d = NULL;
ctrl->i = 0;
if (ctrl->file)
free(ctrl->file);
ctrl->file = NULL;
}
if (ctrl->file) {
uev_io_stop(&ctrl->data_watcher);
free(ctrl->file);
ctrl->file = NULL;
}
if (ctrl->fp) {
fclose(ctrl->fp);
ctrl->fp = NULL;
}
ctrl->pending = 0;
ctrl->offset = 0;
return close_data_connection(ctrl);
}
static void handle_ABOR(ctrl_t *ctrl, char *arg)
{
DBG("Aborting any current transfer ...");
if (do_abort(ctrl))
send_msg(ctrl->sd, "426 Connection closed; transfer aborted.\r\n");
send_msg(ctrl->sd, "226 Closing data connection.\r\n");
}
static void handle_USER(ctrl_t *ctrl, char *name)
{
if (ctrl->name[0]) {
ctrl->name[0] = 0;
ctrl->pass[0] = 0;
}
if (name) {
strlcpy(ctrl->name, name, sizeof(ctrl->name));
if (check_user_pass(ctrl) == 1) {
INFO("Guest logged in from %s", ctrl->clientaddr);
send_msg(ctrl->sd, "230 Guest login OK, access restrictions apply.\r\n");
} else {
send_msg(ctrl->sd, "331 Login OK, please enter password.\r\n");
}
} else {
send_msg(ctrl->sd, "530 You must input your name.\r\n");
}
}
static void handle_PASS(ctrl_t *ctrl, char *pass)
{
if (!ctrl->name[0]) {
send_msg(ctrl->sd, "503 No username given.\r\n");
return;
}
strlcpy(ctrl->pass, pass, sizeof(ctrl->pass));
if (check_user_pass(ctrl) < 0) {
LOG("User %s from %s, invalid password!", ctrl->name, ctrl->clientaddr);
send_msg(ctrl->sd, "530 username or password is unacceptable\r\n");
return;
}
INFO("User %s login from %s", ctrl->name, ctrl->clientaddr);
send_msg(ctrl->sd, "230 Guest login OK, access restrictions apply.\r\n");
}
static void handle_SYST(ctrl_t *ctrl, char *arg)
{
char system[] = "215 UNIX Type: L8\r\n";
send_msg(ctrl->sd, system);
}
static void handle_TYPE(ctrl_t *ctrl, char *argument)
{
char type[24] = "200 Type set to I.\r\n";
char unknown[] = "501 Invalid argument to TYPE.\r\n";
if (!argument)
argument = "Z";
switch (argument[0]) {
case 'A':
ctrl->type = TYPE_A; /* ASCII */
break;
case 'I':
ctrl->type = TYPE_I; /* IMAGE/BINARY */
break;
default:
send_msg(ctrl->sd, unknown);
return;
}
type[16] = argument[0];
send_msg(ctrl->sd, type);
}
static void handle_PWD(ctrl_t *ctrl, char *arg)
{
char buf[sizeof(ctrl->cwd) + 10];
snprintf(buf, sizeof(buf), "257 \"%s\"\r\n", ctrl->cwd);
send_msg(ctrl->sd, buf);
}
static void handle_CWD(ctrl_t *ctrl, char *path)
{
struct stat st;
char *dir;
if (!path)
goto done;
/*
* Some FTP clients, most notably Chrome, use CWD to check if an
* entry is a file or directory.
*/
dir = compose_abspath(ctrl, path);
if (!dir || stat(dir, &st) || !S_ISDIR(st.st_mode) || strlen(home) > strlen(dir)) {
send_msg(ctrl->sd, "550 No such directory.\r\n");
return;
}
if (!chrooted) {
size_t len = strlen(home);
DBG("non-chrooted CWD, home:%s, dir:%s, len:%zd, dirlen:%zd",
home, dir, len, strlen(dir));
dir += len;
}
snprintf(ctrl->cwd, sizeof(ctrl->cwd), "%s", dir);
if (ctrl->cwd[0] == 0)
snprintf(ctrl->cwd, sizeof(ctrl->cwd), "/");
done:
DBG("New CWD: '%s'", ctrl->cwd);
send_msg(ctrl->sd, "250 OK\r\n");
}
static void handle_CDUP(ctrl_t *ctrl, char *path)
{
handle_CWD(ctrl, "..");
}
static void handle_PORT(ctrl_t *ctrl, char *str)
{
int a, b, c, d, e, f;
char addr[INET_ADDRSTRLEN];
struct sockaddr_in sin;
if (ctrl->data_sd > 0) {
uev_io_stop(&ctrl->data_watcher);
close(ctrl->data_sd);
ctrl->data_sd = -1;
}
/* Convert PORT command's argument to IP address + port */
sscanf(str, "%d,%d,%d,%d,%d,%d", &a, &b, &c, &d, &e, &f);
sprintf(addr, "%d.%d.%d.%d", a, b, c, d);
/* Check IPv4 address using inet_aton(), throw away converted result */
if (!inet_aton(addr, &(sin.sin_addr))) {
ERR(0, "Invalid address '%s' given to PORT command", addr);
send_msg(ctrl->sd, "500 Illegal PORT command.\r\n");
return;
}
strlcpy(ctrl->data_address, addr, sizeof(ctrl->data_address));
ctrl->data_port = e * 256 + f;
DBG("Client PORT command accepted for %s:%d", ctrl->data_address, ctrl->data_port);
send_msg(ctrl->sd, "200 PORT command successful.\r\n");
}
static void handle_EPRT(ctrl_t *ctrl, char *str)
{
send_msg(ctrl->sd, "502 Command not implemented.\r\n");
}
static char *mode_to_str(mode_t m)
{
static char str[11];
snprintf(str, sizeof(str), "%c%c%c%c%c%c%c%c%c%c",
S_ISDIR(m) ? 'd' : '-',
m & S_IRUSR ? 'r' : '-',
m & S_IWUSR ? 'w' : '-',
m & S_IXUSR ? 'x' : '-',
m & S_IRGRP ? 'r' : '-',
m & S_IWGRP ? 'w' : '-',
m & S_IXGRP ? 'x' : '-',
m & S_IROTH ? 'r' : '-',
m & S_IWOTH ? 'w' : '-',
m & S_IXOTH ? 'x' : '-');
return str;
}
static char *time_to_str(time_t mtime)
{
struct tm *t = localtime(&mtime);
static char str[20];
setlocale(LC_TIME, "C");
strftime(str, sizeof(str), "%b %e %H:%M", t);
return str;
}
static char *mlsd_time(time_t mtime)
{
struct tm *t = localtime(&mtime);
static char str[20];
strftime(str, sizeof(str), "%Y%m%d%H%M%S", t);
return str;
}
static const char *mlsd_type(char *name, int mode)
{
if (!strcmp(name, "."))
return "cdir";
if (!strcmp(name, ".."))
return "pdir";
return S_ISDIR(mode) ? "dir" : "file";
}
void mlsd_fact(char fact, char *buf, size_t len, char *name, char *perms, struct stat *st)
{
char size[20];
switch (fact) {
case 'm':
strlcat(buf, "modify=", len);
strlcat(buf, mlsd_time(st->st_mtime), len);
break;
case 'p':
strlcat(buf, "perm=", len);
strlcat(buf, perms, len);
break;
case 't':
strlcat(buf, "type=", len);
strlcat(buf, mlsd_type(name, st->st_mode), len);
break;
case 's':
if (S_ISDIR(st->st_mode))
return;
snprintf(size, sizeof(size), "size=%" PRIu64, st->st_size);
strlcat(buf, size, len);
break;
default:
return;
}
strlcat(buf, ";", len);
}
static void mlsd_printf(ctrl_t *ctrl, char *buf, size_t len, char *path, char *name, struct stat *st)
{
char perms[10] = "";
int ro = !access(path, R_OK);
int rw = !access(path, W_OK);
if (S_ISDIR(st->st_mode)) {
/* XXX: Verify 'e' by checking that we can CD to the 'name' */
if (ro)
strlcat(perms, "le", sizeof(perms));
if (rw)
strlcat(perms, "pc", sizeof(perms)); /* 'd' RMD, 'm' MKD */
} else {
if (ro)
strlcat(perms, "r", sizeof(perms));
if (rw)
strlcat(perms, "w", sizeof(perms)); /* 'f' RNFR, 'd' DELE */
}
memset(buf, 0, len);
if (ctrl->d_num == -1 && (ctrl->list_mode & 0x0F) == 2)
strlcat(buf, " ", len);
for (int i = 0; ctrl->facts[i]; i++)
mlsd_fact(ctrl->facts[i], buf, len, name, perms, st);
strlcat(buf, " ", len);
strlcat(buf, name, len);
strlcat(buf, "\r\n", len);
}
static int list_printf(ctrl_t *ctrl, char *buf, size_t len, char *path, char *name)
{
int dirs;
int mode = ctrl->list_mode;
struct stat st;
if (stat(path, &st))
return -1;
dirs = mode & 0xF0;
mode = mode & 0x0F;
if (dirs && !S_ISDIR(st.st_mode))
return 1;
if (!dirs && S_ISDIR(st.st_mode))
return 1;
switch (mode) {
case 3: /* MLSD */
/* fallthrough */
case 2: /* MLST */
mlsd_printf(ctrl, buf, len, path, name, &st);
break;
case 1: /* NLST */
snprintf(buf, len, "%s\r\n", name);
break;
case 0: /* LIST */
snprintf(buf, len, "%s 1 %5d %5d %12" PRIu64 " %s %s\r\n",
mode_to_str(st.st_mode),
0, 0, (uint64_t)st.st_size,
time_to_str(st.st_mtime), name);
break;
}
return 0;
}
static void do_MLST(ctrl_t *ctrl)
{
size_t len = 0;
char buf[512] = { 0 };
int sd = ctrl->sd;
if (ctrl->data_sd != -1)
sd = ctrl->data_sd;
snprintf(buf, sizeof(buf), "250- Listing %s\r\n", ctrl->file);
len = strlen(buf);
if (list_printf(ctrl, &buf[len], sizeof(buf) - len, ctrl->file, basename(ctrl->file))) {
do_abort(ctrl);
send_msg(ctrl->sd, "550 No such file or directory.\r\n");
return;
}
strlcat(buf, "250 End.\r\n", sizeof(buf));
send_msg(sd, buf);
}
static void do_MLSD(ctrl_t *ctrl)
{
char buf[512] = { 0 };
if (list_printf(ctrl, buf, sizeof(buf), ctrl->file, basename(ctrl->file))) {
do_abort(ctrl);
send_msg(ctrl->sd, "550 No such file or directory.\r\n");
return;
}
send_msg(ctrl->data_sd, buf);
send_msg(ctrl->sd, "226 Transfer complete.\r\n");
}
static void do_LIST(uev_t *w, void *arg, int events)
{
ctrl_t *ctrl = (ctrl_t *)arg;
struct timeval tv;
ssize_t bytes;
char buf[BUFFER_SIZE] = { 0 };
if (UEV_ERROR == events || UEV_HUP == events) {
uev_io_start(w);
return;
}
/* Reset inactivity timer. */
uev_timer_set(&ctrl->timeout_watcher, INACTIVITY_TIMER, 0);
if (ctrl->d_num == -1) {
if (ctrl->list_mode == 3)
do_MLSD(ctrl);
else
do_MLST(ctrl);
do_abort(ctrl);
return;
}
gettimeofday(&tv, NULL);
if (tv.tv_sec - ctrl->tv.tv_sec > 3) {
DBG("Sending LIST entry %d of %d to %s ...", ctrl->i, ctrl->d_num, ctrl->clientaddr);
ctrl->tv.tv_sec = tv.tv_sec;
}
ctrl->list_mode |= (ctrl->pending ? 0 : 0x80);
while (ctrl->i < ctrl->d_num) {
struct dirent *entry;
char *name, *path;
char cwd[PATH_MAX];
entry = ctrl->d[ctrl->i++];
name = entry->d_name;
DBG("Found directory entry %s", name);
if ((!strcmp(name, ".") || !strcmp(name, "..")) && ctrl->list_mode < 2)
continue;
snprintf(cwd, sizeof(cwd), "%s%s%s", ctrl->file,
ctrl->file[strlen(ctrl->file) - 1] == '/' ? "" : "/", name);
path = compose_path(ctrl, cwd);
if (!path) {
fail:
LOGIT(LOG_INFO, errno, "Failed reading status for %s", path ? path : name);
continue;
}
switch (list_printf(ctrl, buf, sizeof(buf), path, name)) {
case -1:
goto fail;
case 1:
continue;
default:
break;
}
DBG("LIST %s", buf);
free(entry);
bytes = send(ctrl->data_sd, buf, strlen(buf), 0);
if (-1 == bytes) {
if (ECONNRESET == errno)
DBG("Connection reset by client.");
else
ERR(errno, "Failed sending file %s to client", ctrl->file);
while (ctrl->i < ctrl->d_num) {
struct dirent *entry = ctrl->d[ctrl->i++];
free(entry);
}
do_abort(ctrl);
send_msg(ctrl->sd, "426 TCP connection was established but then broken!\r\n");
}
return;
}
ctrl->list_mode &= 0x0F;
/* Rewind and list files */
if (ctrl->pending == 0) {
ctrl->pending++;
ctrl->i = 0;
return;
}
do_abort(ctrl);
send_msg(ctrl->sd, "226 Transfer complete.\r\n");
}
static void list(ctrl_t *ctrl, char *arg, int mode)
{
char *path;
if (string_valid(arg)) {
char *ptr, *quot;
/* Check if client sends ls arguments ... */
ptr = arg;
while (*ptr) {
if (isspace(*ptr))
ptr++;
if (*ptr == '-') {
while (*ptr && !isspace(*ptr))
ptr++;
}
break;
}
/* Strip any "" from "<arg>" */
while ((quot = strchr(ptr, '"'))) {
char *ptr2;
ptr2 = strchr("[1], '"');
if (ptr2) {
memmove(ptr2, &ptr2[1], strlen(ptr2));
memmove(quot, "[1], strlen(quot));
}
}
arg = ptr;
}
if (mode >= 2)
path = compose_abspath(ctrl, arg);
else
path = compose_path(ctrl, arg);
if (!path) {
send_msg(ctrl->sd, "550 No such file or directory.\r\n");
return;
}
ctrl->list_mode = mode;
ctrl->file = strdup(arg ? arg : "");
ctrl->i = 0;
ctrl->d_num = scandir(path, &ctrl->d, NULL, alphasort);
if (ctrl->d_num == -1) {
send_msg(ctrl->sd, "550 No such file or directory.\r\n");
DBG("Failed reading directory '%s': %s", path, strerror(errno));
return;
}
DBG("Reading directory %s ... %d number of entries", path, ctrl->d_num);
if (ctrl->data_sd > -1) {
send_msg(ctrl->sd, "125 Data connection already open; transfer starting.\r\n");
uev_io_init(ctrl->ctx, &ctrl->data_watcher, do_LIST, ctrl, ctrl->data_sd, UEV_WRITE);
return;
}
do_PORT(ctrl, 1);
}
static void handle_LIST(ctrl_t *ctrl, char *arg)
{
list(ctrl, arg, 0);
}
static void handle_NLST(ctrl_t *ctrl, char *arg)
{
list(ctrl, arg, 1);
}
static void handle_MLST(ctrl_t *ctrl, char *arg)
{
list(ctrl, arg, 2);
}
static void handle_MLSD(ctrl_t *ctrl, char *arg)
{
list(ctrl, arg, 3);
}
static void do_pasv_connection(uev_t *w, void *arg, int events)
{
ctrl_t *ctrl = (ctrl_t *)arg;
int rc = 0;
if (UEV_ERROR == events || UEV_HUP == events) {
DBG("error on data_listen_sd ...");
uev_io_start(w);
return;
}
DBG("Event on data_listen_sd ...");
uev_io_stop(&ctrl->data_watcher);
if (open_data_connection(ctrl))
return;
switch (ctrl->pending) {
case 3:
/* fall-through */
case 2:
if (ctrl->offset)
rc = fseek(ctrl->fp, ctrl->offset, SEEK_SET);
if (rc) {
do_abort(ctrl);
send_msg(ctrl->sd, "551 Failed seeking to that position in file.\r\n");
return;
}
/* fall-through */
case 1:
break;
default:
DBG("No pending command, waiting ...");
return;
}
switch (ctrl->pending) {
case 3: /* STOR */
DBG("Pending STOR, starting ...");
uev_io_init(ctrl->ctx, &ctrl->data_watcher, do_STOR, ctrl, ctrl->data_sd, UEV_READ);
break;
case 2: /* RETR */
DBG("Pending RETR, starting ...");
uev_io_init(ctrl->ctx, &ctrl->data_watcher, do_RETR, ctrl, ctrl->data_sd, UEV_WRITE);
break;
case 1: /* LIST */
DBG("Pending LIST, starting ...");
uev_io_init(ctrl->ctx, &ctrl->data_watcher, do_LIST, ctrl, ctrl->data_sd, UEV_WRITE);
break;
}
if (ctrl->pending == 1 && ctrl->list_mode == 2)
send_msg(ctrl->sd, "150 Opening ASCII mode data connection for MLSD.\r\n");
else
send_msg(ctrl->sd, "150 Data connection accepted; transfer starting.\r\n");
ctrl->pending = 0;
}
static int do_PASV(ctrl_t *ctrl, char *arg, struct sockaddr *data, socklen_t *len)
{
struct sockaddr_in server;
if (ctrl->data_sd > 0) {
close(ctrl->data_sd);
ctrl->data_sd = -1;
}
if (ctrl->data_listen_sd > 0)
close(ctrl->data_listen_sd);
ctrl->data_listen_sd = socket(AF_INET, SOCK_STREAM | SOCK_NONBLOCK, 0);
if (ctrl->data_listen_sd < 0) {
ERR(errno, "Failed opening data server socket");
send_msg(ctrl->sd, "426 Internal server error.\r\n");
return 1;
}
memset(&server, 0, sizeof(server));
server.sin_family = AF_INET;
server.sin_addr.s_addr = inet_addr(ctrl->serveraddr);
server.sin_port = htons(0);
if (bind(ctrl->data_listen_sd, (struct sockaddr *)&server, sizeof(server)) < 0) {
ERR(errno, "Failed binding to client socket");
send_msg(ctrl->sd, "426 Internal server error.\r\n");
close(ctrl->data_listen_sd);
ctrl->data_listen_sd = -1;
return 1;
}
INFO("Data server port estabished. Waiting for client connnect ...");
if (listen(ctrl->data_listen_sd, 1) < 0) {
ERR(errno, "Client data connection failure");
send_msg(ctrl->sd, "426 Internal server error.\r\n");
close(ctrl->data_listen_sd);
ctrl->data_listen_sd = -1;
return 1;
}
memset(data, 0, sizeof(*data));
if (-1 == getsockname(ctrl->data_listen_sd, data, len)) {
ERR(errno, "Cannot determine our address, need it if client should connect to us");
close(ctrl->data_listen_sd);
ctrl->data_listen_sd = -1;
return 1;
}
uev_io_init(ctrl->ctx, &ctrl->data_watcher, do_pasv_connection, ctrl, ctrl->data_listen_sd, UEV_READ);
return 0;
}
static void handle_PASV(ctrl_t *ctrl, char *arg)
{
struct sockaddr_in data;
socklen_t len = sizeof(data);
char *msg, *p, buf[200];
int port;
if (do_PASV(ctrl, arg, (struct sockaddr *)&data, &len))
return;
/* Convert server IP address and port to comma separated list */
msg = strdup(ctrl->serveraddr);
if (!msg) {
send_msg(ctrl->sd, "426 Internal server error.\r\n");
exit(1);
}
p = msg;
while ((p = strchr(p, '.')))
*p++ = ',';
port = ntohs(data.sin_port);
snprintf(buf, sizeof(buf), "227 Entering Passive Mode (%s,%d,%d)\r\n",
msg, port / 256, port % 256);
send_msg(ctrl->sd, buf);
free(msg);
}
static void handle_EPSV(ctrl_t *ctrl, char *arg)
{
struct sockaddr_in data;
socklen_t len = sizeof(data);
char buf[200];
if (string_valid(arg) && string_case_compare(arg, "ALL")) {
send_msg(ctrl->sd, "200 Command OK\r\n");
return;
}
if (do_PASV(ctrl, arg, (struct sockaddr *)&data, &len))
return;
snprintf(buf, sizeof(buf), "229 Entering Extended Passive Mode (|||%d|)\r\n", ntohs(data.sin_port));
send_msg(ctrl->sd, buf);
}
static void do_RETR(uev_t *w, void *arg, int events)
{
ctrl_t *ctrl = (ctrl_t *)arg;
struct timeval tv;
ssize_t bytes;
size_t num;
char buf[BUFFER_SIZE];
if (UEV_ERROR == events || UEV_HUP == events) {
DBG("error on data_sd ...");
uev_io_start(w);
return;