mirror of
https://github.com/sheumann/hush.git
synced 2024-08-20 19:29:02 +00:00
ftpd: EPSV and SIZE support. Tested to work on IPv6 too.
libbb: str2sockaddr shuld accept [IPv6] addr without port - wget 'ftp://[::1]/file' needs that to work. function old new delta bind_for_passive_mode - 129 +129 get_nport - 30 +30 ftpd_main 1731 1760 +29 str2sockaddr 412 431 +19 ------------------------------------------------------------------------------ (add/remove: 2/0 grow/shrink: 2/0 up/down: 207/0) Total: 207 bytes text data bss dec hex filename 808568 476 7864 816908 c770c busybox_old 808804 476 7864 817144 c77f8 busybox_unstripped
This commit is contained in:
Denis Vlasenko
parent
57a3b17498
commit
9b2fbda538
@ -167,7 +167,8 @@ USE_FEATURE_IPV6(sa_family_t af,)
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/* Even uglier parsing of [xx]:nn */
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host++;
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cp = strchr(host, ']');
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if (!cp || cp[1] != ':') { /* Malformed: must have [xx]:nn */
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if (!cp || (cp[1] != ':' && cp[1] != '\0')) {
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/* Malformed: must be [xx]:nn or [xx] */
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bb_error_msg("bad address '%s'", org_host);
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if (ai_flags & DIE_ON_ERROR)
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xfunc_die();
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@ -183,8 +184,11 @@ USE_FEATURE_IPV6(sa_family_t af,)
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if (cp) { /* points to ":" or "]:" */
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int sz = cp - host + 1;
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host = safe_strncpy(alloca(sz), host, sz);
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if (ENABLE_FEATURE_IPV6 && *cp != ':')
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if (ENABLE_FEATURE_IPV6 && *cp != ':') {
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cp++; /* skip ']' */
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if (*cp == '\0') /* [xx] without port */
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goto skip;
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}
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cp++; /* skip ':' */
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port = bb_strtou(cp, NULL, 10);
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if (errno || (unsigned)port > 0xffff) {
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@ -193,6 +197,7 @@ USE_FEATURE_IPV6(sa_family_t af,)
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xfunc_die();
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return NULL;
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}
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skip: ;
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}
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memset(&hint, 0 , sizeof(hint));
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@ -4,6 +4,8 @@
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*
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* Author: Adam Tkac <vonsch@gmail.com>
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*
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* Licensed under GPLv2, see file LICENSE in this tarball for details.
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*
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* Only subset of FTP protocol is implemented but vast majority of clients
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* should not have any problem. You have to run this daemon via inetd.
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*
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@ -32,6 +34,8 @@
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#define FTP_GOODBYE 221
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#define FTP_TRANSFEROK 226
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#define FTP_PASVOK 227
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/*#define FTP_EPRTOK 228*/
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#define FTP_EPSVOK 229
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#define FTP_LOGINOK 230
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#define FTP_CWDOK 250
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#define FTP_RMDIROK 250
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@ -70,6 +74,7 @@ enum {
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const_CDUP = mk_const4('C', 'D', 'U', 'P'),
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const_CWD = mk_const3('C', 'W', 'D'),
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const_DELE = mk_const4('D', 'E', 'L', 'E'),
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const_EPSV = mk_const4('E', 'P', 'S', 'V'),
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const_HELP = mk_const4('H', 'E', 'L', 'P'),
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const_LIST = mk_const4('L', 'I', 'S', 'T'),
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const_MKD = mk_const3('M', 'K', 'D'),
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@ -86,6 +91,7 @@ enum {
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const_RMD = mk_const3('R', 'M', 'D'),
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const_RNFR = mk_const4('R', 'N', 'F', 'R'),
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const_RNTO = mk_const4('R', 'N', 'T', 'O'),
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const_SIZE = mk_const4('S', 'I', 'Z', 'E'),
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const_STAT = mk_const4('S', 'T', 'A', 'T'),
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const_STOR = mk_const4('S', 'T', 'O', 'R'),
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const_STOU = mk_const4('S', 'T', 'O', 'U'),
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@ -232,26 +238,11 @@ handle_cdup(void)
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handle_cwd();
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}
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//static void
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//handle_type(void)
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//{
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// if (G.ftp_arg
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// && ( ((G.ftp_arg[0] | 0x20) == 'i' && G.ftp_arg[1] == '\0')
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// || !strcasecmp(G.ftp_arg, "L8")
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// || !strcasecmp(G.ftp_arg, "L 8")
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// )
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// ) {
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// cmdio_write_ok(FTP_TYPEOK);
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// } else {
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// cmdio_write_error(FTP_BADCMD);
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// }
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//}
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static void
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handle_stat(void)
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{
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cmdio_write_raw(STR(FTP_STATOK)"-FTP server status:\r\n"
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"TYPE: BINARY\r\n"
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" TYPE: BINARY\r\n"
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STR(FTP_STATOK)" Ok\r\n");
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}
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@ -259,11 +250,11 @@ static void
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handle_help(void)
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{
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cmdio_write_raw(STR(FTP_HELP)"-Commands:\r\n"
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"ALLO CDUP CWD HELP LIST\r\n"
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"MODE NLST NOOP PASS PASV PORT PWD QUIT\r\n"
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"REST RETR STAT STRU SYST TYPE USER\r\n"
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" ALLO CDUP CWD EPSV HELP LIST\r\n"
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" MODE NLST NOOP PASS PASV PORT PWD QUIT\r\n"
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" REST RETR SIZE STAT STRU SYST TYPE USER\r\n"
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#if ENABLE_FEATURE_FTP_WRITE
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"APPE DELE MKD RMD RNFR RNTO STOR STOU\r\n"
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" APPE DELE MKD RMD RNFR RNTO STOR STOU\r\n"
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#endif
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STR(FTP_HELP)" Ok\r\n");
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}
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@ -380,47 +371,57 @@ port_pasv_cleanup(void)
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G.pasv_listen_fd = -1;
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}
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static void
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handle_pasv(void)
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static unsigned
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bind_for_passive_mode(void)
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{
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int bind_retries = 10;
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unsigned short port;
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enum { min_port = 1024, max_port = 65535 };
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char *addr, *response;
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unsigned port;
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port_pasv_cleanup();
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G.pasv_listen_fd = xsocket(G.local_addr->u.sa.sa_family, SOCK_STREAM, 0);
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setsockopt_reuseaddr(G.pasv_listen_fd);
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/* TODO bind() with port == 0 and then call getsockname */
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while (--bind_retries) {
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port = rand() % max_port;
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if (port < min_port) {
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port += min_port;
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}
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set_nport(G.local_addr, 0);
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xbind(G.pasv_listen_fd, &G.local_addr->u.sa, G.local_addr->len);
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xlisten(G.pasv_listen_fd, 1);
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getsockname(G.pasv_listen_fd, &G.local_addr->u.sa, &G.local_addr->len);
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set_nport(G.local_addr, htons(port));
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/* We don't want to use xbind, it'll die if port is in use */
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if (bind(G.pasv_listen_fd, &G.local_addr->u.sa, G.local_addr->len) != 0) {
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/* do we want check if errno == EADDRINUSE ? */
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continue;
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}
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xlisten(G.pasv_listen_fd, 1);
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break;
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}
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port = get_nport(&G.local_addr->u.sa);
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port = ntohs(port);
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if (!bind_retries)
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bb_error_msg_and_die("can't create pasv socket");
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return port;
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}
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addr = xmalloc_sockaddr2dotted_noport(&G.local_addr->u.sa);
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static void
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handle_pasv(void)
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{
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unsigned port;
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char *addr, *response;
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port = bind_for_passive_mode();
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if (G.local_addr->u.sa.sa_family == AF_INET)
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addr = xmalloc_sockaddr2dotted_noport(&G.local_addr->u.sa);
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else /* seen this in the wild done by other ftp servers: */
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addr = xstrdup("0.0.0.0");
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replace_char(addr, '.', ',');
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response = xasprintf(" Entering Passive Mode (%s,%u,%u)",
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response = xasprintf(STR(FTP_PASVOK)" Entering Passive Mode (%s,%u,%u)\r\n",
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addr, (int)(port >> 8), (int)(port & 255));
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free(addr);
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cmdio_write_raw(response);
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free(response);
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}
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cmdio_write(FTP_PASVOK, response);
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static void
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handle_epsv(void)
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{
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unsigned port;
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char *response;
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port = bind_for_passive_mode();
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response = xasprintf(STR(FTP_EPSVOK)" EPSV Ok (|||%u|)\r\n", port);
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cmdio_write_raw(response);
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free(response);
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}
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@ -477,7 +478,7 @@ static void
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handle_retr(void)
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{
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struct stat statbuf;
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int trans_ret, retval;
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int trans_ret;
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int remote_fd;
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int opened_file;
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off_t offset = G.restart_pos;
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@ -495,8 +496,7 @@ handle_retr(void)
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return;
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}
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retval = fstat(opened_file, &statbuf);
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if (retval < 0 || !S_ISREG(statbuf.st_mode)) {
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if (fstat(opened_file, &statbuf) != 0 || !S_ISREG(statbuf.st_mode)) {
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/* Note - pretend open failed */
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cmdio_write_error(FTP_FILEFAIL);
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goto file_close_out;
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@ -580,10 +580,8 @@ write_filestats(int fd, const char *filename,
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off_t size;
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char *stats, *lnkname = NULL, *perms;
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const char *name;
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int retval;
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char timestr[32];
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struct tm *tm;
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const char *format = "%b %d %H:%M";
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name = bb_get_last_path_component_nostrip(filename);
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@ -595,8 +593,7 @@ write_filestats(int fd, const char *filename,
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lnkname = xmalloc_readlink(filename);
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tm = gmtime(&statbuf->st_mtime);
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retval = strftime(timestr, sizeof(timestr), format, tm);
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if (retval == 0)
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if (strftime(timestr, sizeof(timestr), "%b %d %H:%M", tm) == 0)
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bb_error_msg_and_die("strftime");
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timestr[sizeof(timestr) - 1] = '\0';
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@ -719,6 +716,23 @@ handle_stat_file(void)
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handle_dir_common(1, 1);
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}
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static void
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handle_size(void)
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{
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struct stat statbuf;
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char buf[sizeof(STR(FTP_STATFILE_OK)" %"OFF_FMT"u\r\n") + sizeof(off_t)*3];
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if (!G.ftp_arg
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|| stat(G.ftp_arg, &statbuf) != 0
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|| !S_ISREG(statbuf.st_mode)
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) {
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cmdio_write_error(FTP_FILEFAIL);
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return;
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}
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sprintf(buf, STR(FTP_STATFILE_OK)" %"OFF_FMT"u\r\n", statbuf.st_size);
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cmdio_write_raw(buf);
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}
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/* Upload commands */
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#if ENABLE_FEATURE_FTP_WRITE
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@ -1003,63 +1017,52 @@ int ftpd_main(int argc UNUSED_PARAM, char **argv)
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cmdio_write_ok(FTP_GOODBYE);
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return 0;
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}
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if (cmdval == const_PWD)
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else if (cmdval == const_USER)
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cmdio_write_ok(FTP_GIVEPWORD);
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else if (cmdval == const_PASS)
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cmdio_write_ok(FTP_LOGINOK);
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else if (cmdval == const_NOOP)
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cmdio_write_ok(FTP_NOOPOK);
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else if (cmdval == const_TYPE)
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cmdio_write_ok(FTP_TYPEOK);
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else if (cmdval == const_STRU)
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cmdio_write_ok(FTP_STRUOK);
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else if (cmdval == const_MODE)
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cmdio_write_ok(FTP_MODEOK);
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else if (cmdval == const_ALLO)
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cmdio_write_ok(FTP_ALLOOK);
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else if (cmdval == const_SYST)
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cmdio_write_raw(STR(FTP_SYSTOK)" UNIX Type: L8\r\n");
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else if (cmdval == const_PWD)
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handle_pwd();
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else if (cmdval == const_CWD)
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handle_cwd();
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else if (cmdval == const_CDUP) /* cd .. */
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handle_cdup();
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else if (cmdval == const_PASV)
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handle_pasv();
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else if (cmdval == const_RETR)
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handle_retr();
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else if (cmdval == const_NOOP)
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cmdio_write_ok(FTP_NOOPOK);
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else if (cmdval == const_SYST)
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cmdio_write_raw(STR(FTP_SYSTOK)" UNIX Type: L8\r\n");
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else if (cmdval == const_HELP)
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handle_help();
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else if (cmdval == const_LIST) /* ls -l */
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handle_list();
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else if (cmdval == const_TYPE)
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//handle_type();
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cmdio_write_ok(FTP_TYPEOK);
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else if (cmdval == const_PORT)
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handle_port();
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else if (cmdval == const_REST)
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handle_rest();
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else if (cmdval == const_NLST) /* "name list", bare ls */
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handle_nlst();
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else if (cmdval == const_STRU) {
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//if (G.ftp_arg
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// && (G.ftp_arg[0] | 0x20) == 'f'
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// && G.ftp_arg[1] == '\0'
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//) {
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cmdio_write_ok(FTP_STRUOK);
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//} else
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// cmdio_write_raw(STR(FTP_BADSTRU)" Bad STRU command\r\n");
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} else if (cmdval == const_MODE) {
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//if (G.ftp_arg
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// && (G.ftp_arg[0] | 0x20) == 's'
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// && G.ftp_arg[1] == '\0'
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//) {
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cmdio_write_ok(FTP_MODEOK);
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//} else
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// cmdio_write_raw(STR(FTP_BADMODE)" Bad MODE command\r\n");
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}
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else if (cmdval == const_ALLO)
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cmdio_write_ok(FTP_ALLOOK);
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else if (cmdval == const_SIZE)
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handle_size();
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else if (cmdval == const_STAT) {
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if (G.ftp_arg == NULL)
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handle_stat();
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else
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handle_stat_file();
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} else if (cmdval == const_USER) {
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/* FTP_LOGINERR confuses clients: */
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/* cmdio_write_raw(STR(FTP_LOGINERR)" Can't change to another user\r\n"); */
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cmdio_write_ok(FTP_GIVEPWORD);
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} else if (cmdval == const_PASS)
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cmdio_write_ok(FTP_LOGINOK);
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}
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else if (cmdval == const_PASV)
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handle_pasv();
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else if (cmdval == const_EPSV)
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handle_epsv();
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else if (cmdval == const_RETR)
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handle_retr();
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else if (cmdval == const_PORT)
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handle_port();
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else if (cmdval == const_REST)
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handle_rest();
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#if ENABLE_FEATURE_FTP_WRITE
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else if (G.opts & OPT_w) {
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if (cmdval == const_STOR)
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@ -1096,10 +1099,8 @@ int ftpd_main(int argc UNUSED_PARAM, char **argv)
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else {
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/* Which unsupported commands were seen in the wild?
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* (doesn't necessarily mean "we must support them")
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* wget 1.11.4: SIZE - todo
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* lftp 3.6.3: FEAT - is it useful?
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* MDTM - works fine without it anyway
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* IPv6-style PASV: "EPSV 2" - todo
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*/
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cmdio_write_raw(STR(FTP_BADCMD)" Unknown command\r\n");
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}
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