udhcpc: add support for DHCP option 212 (RFC 5969)

[oweals/busybox.git] / networking / ftpd.c

diff --git a/networking/ftpd.c b/networking/ftpd.c
index b7d5b20b19b2c6c1a69113a140396e004b34ea42..e38138c0a85b1b4d8ef0e753597ab323c5113ae9 100644 (file)
--- a/networking/ftpd.c
+++ b/networking/ftpd.c
@@ -4,7 +4,7 @@
  *
  * Author: Adam Tkac <vonsch@gmail.com>
  *
- * Licensed under GPLv2, see file LICENSE in this tarball for details.
+ * Licensed under GPLv2, see file LICENSE in this source tree.
  *
  * Only subset of FTP protocol is implemented but vast majority of clients
  * should not have any problem.
@@ -12,6 +12,22 @@
  * You have to run this daemon via inetd.
  */
 
+//usage:#define ftpd_trivial_usage
+//usage:       "[-wvS] [-t N] [-T N] [DIR]"
+//usage:#define ftpd_full_usage "\n\n"
+//usage:       "Anonymous FTP server\n"
+//usage:       "\n"
+//usage:       "ftpd should be used as an inetd service.\n"
+//usage:       "ftpd's line for inetd.conf:\n"
+//usage:       "       21 stream tcp nowait root ftpd ftpd /files/to/serve\n"
+//usage:       "It also can be ran from tcpsvd:\n"
+//usage:       "       tcpsvd -vE 0.0.0.0 21 ftpd /files/to/serve\n"
+//usage:     "\n       -w      Allow upload"
+//usage:     "\n       -v      Log errors to stderr. -vv: verbose log"
+//usage:     "\n       -S      Log errors to syslog. -SS: verbose log"
+//usage:     "\n       -t,-T   Idle and absolute timeouts"
+//usage:     "\n       DIR     Change root to this directory"
+
 #include "libbb.h"
 #include <syslog.h>
 #include <netinet/tcp.h>
@@ -106,7 +122,7 @@ struct globals {
        /* We need these aligned to uint32_t */
        char msg_ok [(sizeof("NNN " MSG_OK ) + 3) & 0xfffc];
        char msg_err[(sizeof("NNN " MSG_ERR) + 3) & 0xfffc];
-};
+} FIX_ALIASING;
 #define G (*(struct globals*)&bb_common_bufsiz1)
 #define INIT_G() do { \
        /* Moved to main */ \
@@ -206,7 +222,7 @@ cmdio_write_error(unsigned status)
 {
        *(uint32_t *) G.msg_err = status;
        xwrite(STDOUT_FILENO, G.msg_err, sizeof("NNN " MSG_ERR) - 1);
-       if (G.verbose > 1)
+       if (G.verbose > 0)
                verbose_log(G.msg_err);
 }
 #define WRITE_ERR(a) cmdio_write_error(STRNUM32sp(a))
@@ -416,7 +432,7 @@ bind_for_passive_mode(void)
        G.pasv_listen_fd = fd = xsocket(G.local_addr->u.sa.sa_family, SOCK_STREAM, 0);
        setsockopt_reuseaddr(fd);
 
-       set_nport(G.local_addr, 0);
+       set_nport(&G.local_addr->u.sa, 0);
        xbind(fd, &G.local_addr->u.sa, G.local_addr->len);
        xlisten(fd, 1);
        getsockname(fd, &G.local_addr->u.sa, &G.local_addr->len);
@@ -461,21 +477,6 @@ handle_epsv(void)
        free(response);
 }
 
-/* libbb candidate */
-static
-len_and_sockaddr* get_peer_lsa(int fd)
-{
-       len_and_sockaddr *lsa;
-       socklen_t len = 0;
-
-       if (getpeername(fd, NULL, &len) != 0)
-               return NULL;
-       lsa = xzalloc(LSA_LEN_SIZE + len);
-       lsa->len = len;
-       getpeername(fd, &lsa->u.sa, &lsa->len);
-       return lsa;
-}
-
 static void
 handle_port(void)
 {
@@ -540,7 +541,7 @@ handle_port(void)
        G.port_addr = xdotted2sockaddr(raw, port);
 #else
        G.port_addr = get_peer_lsa(STDIN_FILENO);
-       set_nport(G.port_addr, htons(port));
+       set_nport(&G.port_addr->u.sa, htons(port));
 #endif
        WRITE_OK(FTP_PORTOK);
 }
@@ -549,7 +550,7 @@ static void
 handle_rest(void)
 {
        /* When ftp_arg == NULL simply restart from beginning */
-       G.restart_pos = G.ftp_arg ? xatoi_u(G.ftp_arg) : 0;
+       G.restart_pos = G.ftp_arg ? xatoi_positive(G.ftp_arg) : 0;
        WRITE_OK(FTP_RESTOK);
 }
 
@@ -633,10 +634,10 @@ popen_ls(const char *opt)
        argv[4] = NULL;
 
        /* Improve compatibility with non-RFC conforming FTP clients
-        * which send e.g. "LIST -l", "LIST -la".
+        * which send e.g. "LIST -l", "LIST -la", "LIST -aL".
         * See https://bugs.kde.org/show_bug.cgi?id=195578 */
        if (ENABLE_FEATURE_FTPD_ACCEPT_BROKEN_LIST
-        && G.ftp_arg && G.ftp_arg[0] == '-' && G.ftp_arg[1] == 'l'
+        && G.ftp_arg && G.ftp_arg[0] == '-'
        ) {
                const char *tmp = strchr(G.ftp_arg, ' ');
                if (tmp) /* skip the space */
@@ -647,10 +648,7 @@ popen_ls(const char *opt)
        xpiped_pair(outfd);
 
        /*fflush_all(); - so far we dont use stdio on output */
-       pid = BB_MMU ? fork() : vfork();
-       if (pid < 0)
-               bb_perror_msg_and_die(BB_MMU ? "fork" : "vfork");
-
+       pid = BB_MMU ? xfork() : xvfork();
        if (pid == 0) {
                /* child */
 #if !BB_MMU
@@ -981,17 +979,23 @@ handle_stou(void)
 static uint32_t
 cmdio_get_cmd_and_arg(void)
 {
-       size_t len;
+       int len;
        uint32_t cmdval;
        char *cmd;
 
        alarm(G.timeout);
 
        free(G.ftp_cmd);
-       len = 8 * 1024; /* Paranoia. Peer may send 1 gigabyte long cmd... */
-       G.ftp_cmd = cmd = xmalloc_fgets_str_len(stdin, "\r\n", &len);
-       if (!cmd)
-               exit(0);
+       {
+               /* Paranoia. Peer may send 1 gigabyte long cmd... */
+               /* Using separate len_on_stk instead of len optimizes
+                * code size (allows len to be in CPU register) */
+               size_t len_on_stk = 8 * 1024;
+               G.ftp_cmd = cmd = xmalloc_fgets_str_len(stdin, "\r\n", &len_on_stk);
+               if (!cmd)
+                       exit(0);
+               len = len_on_stk;
+       }
 
        /* De-escape telnet: 0xff,0xff => 0xff */
        /* RFC959 says that ABOR, STAT, QUIT may be sent even during
@@ -1127,9 +1131,9 @@ int ftpd_main(int argc UNUSED_PARAM, char **argv)
        opts = getopt32(argv, "l1vS" IF_FEATURE_FTP_WRITE("w") "t:T:", &G.timeout, &abs_timeout, &G.verbose, &verbose_S);
        if (opts & (OPT_l|OPT_1)) {
                /* Our secret backdoor to ls */
-/* TODO: pass -n? It prevents user/group resolution, whicj may not work in chroot anyway */
+/* TODO: pass -n? It prevents user/group resolution, which may not work in chroot anyway */
 /* TODO: pass -A? It shows dot files */
-/* TODO: pass --group-directories-first? would be nice, but ls don't do that yet */
+/* TODO: pass --group-directories-first? would be nice, but ls doesn't do that yet */
                xchdir(argv[2]);
                argv[2] = (char*)"--";
                /* memset(&G, 0, sizeof(G)); - ls_main does it */