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Diffstat (limited to 'networking/ftpd.c')
-rw-r--r--networking/ftpd.c193
1 files changed, 97 insertions, 96 deletions
diff --git a/networking/ftpd.c b/networking/ftpd.c
index b2d6ef2..e830660 100644
--- a/networking/ftpd.c
+++ b/networking/ftpd.c
@@ -4,6 +4,8 @@
*
* Author: Adam Tkac <vonsch@gmail.com>
*
+ * Licensed under GPLv2, see file LICENSE in this tarball for details.
+ *
* Only subset of FTP protocol is implemented but vast majority of clients
* should not have any problem. You have to run this daemon via inetd.
*
@@ -32,6 +34,8 @@
#define FTP_GOODBYE 221
#define FTP_TRANSFEROK 226
#define FTP_PASVOK 227
+/*#define FTP_EPRTOK 228*/
+#define FTP_EPSVOK 229
#define FTP_LOGINOK 230
#define FTP_CWDOK 250
#define FTP_RMDIROK 250
@@ -70,6 +74,7 @@ enum {
const_CDUP = mk_const4('C', 'D', 'U', 'P'),
const_CWD = mk_const3('C', 'W', 'D'),
const_DELE = mk_const4('D', 'E', 'L', 'E'),
+ const_EPSV = mk_const4('E', 'P', 'S', 'V'),
const_HELP = mk_const4('H', 'E', 'L', 'P'),
const_LIST = mk_const4('L', 'I', 'S', 'T'),
const_MKD = mk_const3('M', 'K', 'D'),
@@ -86,6 +91,7 @@ enum {
const_RMD = mk_const3('R', 'M', 'D'),
const_RNFR = mk_const4('R', 'N', 'F', 'R'),
const_RNTO = mk_const4('R', 'N', 'T', 'O'),
+ const_SIZE = mk_const4('S', 'I', 'Z', 'E'),
const_STAT = mk_const4('S', 'T', 'A', 'T'),
const_STOR = mk_const4('S', 'T', 'O', 'R'),
const_STOU = mk_const4('S', 'T', 'O', 'U'),
@@ -232,26 +238,11 @@ handle_cdup(void)
handle_cwd();
}
-//static void
-//handle_type(void)
-//{
-// if (G.ftp_arg
-// && ( ((G.ftp_arg[0] | 0x20) == 'i' && G.ftp_arg[1] == '\0')
-// || !strcasecmp(G.ftp_arg, "L8")
-// || !strcasecmp(G.ftp_arg, "L 8")
-// )
-// ) {
-// cmdio_write_ok(FTP_TYPEOK);
-// } else {
-// cmdio_write_error(FTP_BADCMD);
-// }
-//}
-
static void
handle_stat(void)
{
cmdio_write_raw(STR(FTP_STATOK)"-FTP server status:\r\n"
- "TYPE: BINARY\r\n"
+ " TYPE: BINARY\r\n"
STR(FTP_STATOK)" Ok\r\n");
}
@@ -259,11 +250,11 @@ static void
handle_help(void)
{
cmdio_write_raw(STR(FTP_HELP)"-Commands:\r\n"
- "ALLO CDUP CWD HELP LIST\r\n"
- "MODE NLST NOOP PASS PASV PORT PWD QUIT\r\n"
- "REST RETR STAT STRU SYST TYPE USER\r\n"
+ " ALLO CDUP CWD EPSV HELP LIST\r\n"
+ " MODE NLST NOOP PASS PASV PORT PWD QUIT\r\n"
+ " REST RETR SIZE STAT STRU SYST TYPE USER\r\n"
#if ENABLE_FEATURE_FTP_WRITE
- "APPE DELE MKD RMD RNFR RNTO STOR STOU\r\n"
+ " APPE DELE MKD RMD RNFR RNTO STOR STOU\r\n"
#endif
STR(FTP_HELP)" Ok\r\n");
}
@@ -380,47 +371,57 @@ port_pasv_cleanup(void)
G.pasv_listen_fd = -1;
}
-static void
-handle_pasv(void)
+static unsigned
+bind_for_passive_mode(void)
{
- int bind_retries = 10;
- unsigned short port;
- enum { min_port = 1024, max_port = 65535 };
- char *addr, *response;
+ unsigned port;
port_pasv_cleanup();
G.pasv_listen_fd = xsocket(G.local_addr->u.sa.sa_family, SOCK_STREAM, 0);
setsockopt_reuseaddr(G.pasv_listen_fd);
- /* TODO bind() with port == 0 and then call getsockname */
- while (--bind_retries) {
- port = rand() % max_port;
- if (port < min_port) {
- port += min_port;
- }
+ set_nport(G.local_addr, 0);
+ xbind(G.pasv_listen_fd, &G.local_addr->u.sa, G.local_addr->len);
+ xlisten(G.pasv_listen_fd, 1);
+ getsockname(G.pasv_listen_fd, &G.local_addr->u.sa, &G.local_addr->len);
- set_nport(G.local_addr, htons(port));
- /* We don't want to use xbind, it'll die if port is in use */
- if (bind(G.pasv_listen_fd, &G.local_addr->u.sa, G.local_addr->len) != 0) {
- /* do we want check if errno == EADDRINUSE ? */
- continue;
- }
- xlisten(G.pasv_listen_fd, 1);
- break;
- }
+ port = get_nport(&G.local_addr->u.sa);
+ port = ntohs(port);
- if (!bind_retries)
- bb_error_msg_and_die("can't create pasv socket");
+ return port;
+}
- addr = xmalloc_sockaddr2dotted_noport(&G.local_addr->u.sa);
+static void
+handle_pasv(void)
+{
+ unsigned port;
+ char *addr, *response;
+
+ port = bind_for_passive_mode();
+
+ if (G.local_addr->u.sa.sa_family == AF_INET)
+ addr = xmalloc_sockaddr2dotted_noport(&G.local_addr->u.sa);
+ else /* seen this in the wild done by other ftp servers: */
+ addr = xstrdup("0.0.0.0");
replace_char(addr, '.', ',');
- response = xasprintf(" Entering Passive Mode (%s,%u,%u)",
+ response = xasprintf(STR(FTP_PASVOK)" Entering Passive Mode (%s,%u,%u)\r\n",
addr, (int)(port >> 8), (int)(port & 255));
free(addr);
+ cmdio_write_raw(response);
+ free(response);
+}
- cmdio_write(FTP_PASVOK, response);
+static void
+handle_epsv(void)
+{
+ unsigned port;
+ char *response;
+
+ port = bind_for_passive_mode();
+ response = xasprintf(STR(FTP_EPSVOK)" EPSV Ok (|||%u|)\r\n", port);
+ cmdio_write_raw(response);
free(response);
}
@@ -477,7 +478,7 @@ static void
handle_retr(void)
{
struct stat statbuf;
- int trans_ret, retval;
+ int trans_ret;
int remote_fd;
int opened_file;
off_t offset = G.restart_pos;
@@ -495,8 +496,7 @@ handle_retr(void)
return;
}
- retval = fstat(opened_file, &statbuf);
- if (retval < 0 || !S_ISREG(statbuf.st_mode)) {
+ if (fstat(opened_file, &statbuf) != 0 || !S_ISREG(statbuf.st_mode)) {
/* Note - pretend open failed */
cmdio_write_error(FTP_FILEFAIL);
goto file_close_out;
@@ -580,10 +580,8 @@ write_filestats(int fd, const char *filename,
off_t size;
char *stats, *lnkname = NULL, *perms;
const char *name;
- int retval;
char timestr[32];
struct tm *tm;
- const char *format = "%b %d %H:%M";
name = bb_get_last_path_component_nostrip(filename);
@@ -595,8 +593,7 @@ write_filestats(int fd, const char *filename,
lnkname = xmalloc_readlink(filename);
tm = gmtime(&statbuf->st_mtime);
- retval = strftime(timestr, sizeof(timestr), format, tm);
- if (retval == 0)
+ if (strftime(timestr, sizeof(timestr), "%b %d %H:%M", tm) == 0)
bb_error_msg_and_die("strftime");
timestr[sizeof(timestr) - 1] = '\0';
@@ -719,6 +716,23 @@ handle_stat_file(void)
handle_dir_common(1, 1);
}
+static void
+handle_size(void)
+{
+ struct stat statbuf;
+ char buf[sizeof(STR(FTP_STATFILE_OK)" %"OFF_FMT"u\r\n") + sizeof(off_t)*3];
+
+ if (!G.ftp_arg
+ || stat(G.ftp_arg, &statbuf) != 0
+ || !S_ISREG(statbuf.st_mode)
+ ) {
+ cmdio_write_error(FTP_FILEFAIL);
+ return;
+ }
+ sprintf(buf, STR(FTP_STATFILE_OK)" %"OFF_FMT"u\r\n", statbuf.st_size);
+ cmdio_write_raw(buf);
+}
+
/* Upload commands */
#if ENABLE_FEATURE_FTP_WRITE
@@ -1003,63 +1017,52 @@ int ftpd_main(int argc UNUSED_PARAM, char **argv)
cmdio_write_ok(FTP_GOODBYE);
return 0;
}
- if (cmdval == const_PWD)
+ else if (cmdval == const_USER)
+ cmdio_write_ok(FTP_GIVEPWORD);
+ else if (cmdval == const_PASS)
+ cmdio_write_ok(FTP_LOGINOK);
+ else if (cmdval == const_NOOP)
+ cmdio_write_ok(FTP_NOOPOK);
+ else if (cmdval == const_TYPE)
+ cmdio_write_ok(FTP_TYPEOK);
+ else if (cmdval == const_STRU)
+ cmdio_write_ok(FTP_STRUOK);
+ else if (cmdval == const_MODE)
+ cmdio_write_ok(FTP_MODEOK);
+ else if (cmdval == const_ALLO)
+ cmdio_write_ok(FTP_ALLOOK);
+ else if (cmdval == const_SYST)
+ cmdio_write_raw(STR(FTP_SYSTOK)" UNIX Type: L8\r\n");
+ else if (cmdval == const_PWD)
handle_pwd();
else if (cmdval == const_CWD)
handle_cwd();
else if (cmdval == const_CDUP) /* cd .. */
handle_cdup();
- else if (cmdval == const_PASV)
- handle_pasv();
- else if (cmdval == const_RETR)
- handle_retr();
- else if (cmdval == const_NOOP)
- cmdio_write_ok(FTP_NOOPOK);
- else if (cmdval == const_SYST)
- cmdio_write_raw(STR(FTP_SYSTOK)" UNIX Type: L8\r\n");
else if (cmdval == const_HELP)
handle_help();
else if (cmdval == const_LIST) /* ls -l */
handle_list();
- else if (cmdval == const_TYPE)
- //handle_type();
- cmdio_write_ok(FTP_TYPEOK);
- else if (cmdval == const_PORT)
- handle_port();
- else if (cmdval == const_REST)
- handle_rest();
else if (cmdval == const_NLST) /* "name list", bare ls */
handle_nlst();
- else if (cmdval == const_STRU) {
- //if (G.ftp_arg
- // && (G.ftp_arg[0] | 0x20) == 'f'
- // && G.ftp_arg[1] == '\0'
- //) {
- cmdio_write_ok(FTP_STRUOK);
- //} else
- // cmdio_write_raw(STR(FTP_BADSTRU)" Bad STRU command\r\n");
- } else if (cmdval == const_MODE) {
- //if (G.ftp_arg
- // && (G.ftp_arg[0] | 0x20) == 's'
- // && G.ftp_arg[1] == '\0'
- //) {
- cmdio_write_ok(FTP_MODEOK);
- //} else
- // cmdio_write_raw(STR(FTP_BADMODE)" Bad MODE command\r\n");
- }
- else if (cmdval == const_ALLO)
- cmdio_write_ok(FTP_ALLOOK);
+ else if (cmdval == const_SIZE)
+ handle_size();
else if (cmdval == const_STAT) {
if (G.ftp_arg == NULL)
handle_stat();
else
handle_stat_file();
- } else if (cmdval == const_USER) {
- /* FTP_LOGINERR confuses clients: */
- /* cmdio_write_raw(STR(FTP_LOGINERR)" Can't change to another user\r\n"); */
- cmdio_write_ok(FTP_GIVEPWORD);
- } else if (cmdval == const_PASS)
- cmdio_write_ok(FTP_LOGINOK);
+ }
+ else if (cmdval == const_PASV)
+ handle_pasv();
+ else if (cmdval == const_EPSV)
+ handle_epsv();
+ else if (cmdval == const_RETR)
+ handle_retr();
+ else if (cmdval == const_PORT)
+ handle_port();
+ else if (cmdval == const_REST)
+ handle_rest();
#if ENABLE_FEATURE_FTP_WRITE
else if (G.opts & OPT_w) {
if (cmdval == const_STOR)
@@ -1096,10 +1099,8 @@ int ftpd_main(int argc UNUSED_PARAM, char **argv)
else {
/* Which unsupported commands were seen in the wild?
* (doesn't necessarily mean "we must support them")
- * wget 1.11.4: SIZE - todo
* lftp 3.6.3: FEAT - is it useful?
* MDTM - works fine without it anyway
- * IPv6-style PASV: "EPSV 2" - todo
*/
cmdio_write_raw(STR(FTP_BADCMD)" Unknown command\r\n");
}
generated by cgit v1.1 at 2024-12-27 22:23:41 +0000