[T106][ZXW-22]7520V3SCV2.01.01.02P42U09_VEC_V0.8_AP_VEC origin source commit
Change-Id: Ic6e05d89ecd62fc34f82b23dcf306c93764aec4b
diff --git a/ap/app/busybox/src/networking/ftpd.c b/ap/app/busybox/src/networking/ftpd.c
new file mode 100644
index 0000000..33db964
--- /dev/null
+++ b/ap/app/busybox/src/networking/ftpd.c
@@ -0,0 +1,1378 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * Simple FTP daemon, based on vsftpd 2.0.7 (written by Chris Evans)
+ *
+ * Author: Adam Tkac <vonsch@gmail.com>
+ *
+ * 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.
+ *
+ * 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>
+
+#define FTP_DATACONN 150
+#define FTP_NOOPOK 200
+#define FTP_TYPEOK 200
+#define FTP_PORTOK 200
+#define FTP_STRUOK 200
+#define FTP_MODEOK 200
+#define FTP_ALLOOK 202
+#define FTP_STATOK 211
+#define FTP_STATFILE_OK 213
+#define FTP_HELP 214
+#define FTP_SYSTOK 215
+#define FTP_GREET 220
+#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
+#define FTP_DELEOK 250
+#define FTP_RENAMEOK 250
+#define FTP_PWDOK 257
+#define FTP_MKDIROK 257
+#define FTP_GIVEPWORD 331
+#define FTP_RESTOK 350
+#define FTP_RNFROK 350
+#define FTP_TIMEOUT 421
+#define FTP_BADSENDCONN 425
+#define FTP_BADSENDNET 426
+#define FTP_BADSENDFILE 451
+#define FTP_BADCMD 500
+#define FTP_COMMANDNOTIMPL 502
+#define FTP_NEEDUSER 503
+#define FTP_NEEDRNFR 503
+#define FTP_BADSTRU 504
+#define FTP_BADMODE 504
+#define FTP_LOGINERR 530
+#define FTP_FILEFAIL 550
+#define FTP_NOPERM 550
+#define FTP_UPLOADFAIL 553
+
+#define STR1(s) #s
+#define STR(s) STR1(s)
+
+/* Convert a constant to 3-digit string, packed into uint32_t */
+enum {
+ /* Shift for Nth decimal digit */
+ SHIFT2 = 0 * BB_LITTLE_ENDIAN + 24 * BB_BIG_ENDIAN,
+ SHIFT1 = 8 * BB_LITTLE_ENDIAN + 16 * BB_BIG_ENDIAN,
+ SHIFT0 = 16 * BB_LITTLE_ENDIAN + 8 * BB_BIG_ENDIAN,
+ /* And for 4th position (space) */
+ SHIFTsp = 24 * BB_LITTLE_ENDIAN + 0 * BB_BIG_ENDIAN,
+};
+#define STRNUM32(s) (uint32_t)(0 \
+ | (('0' + ((s) / 1 % 10)) << SHIFT0) \
+ | (('0' + ((s) / 10 % 10)) << SHIFT1) \
+ | (('0' + ((s) / 100 % 10)) << SHIFT2) \
+)
+#define STRNUM32sp(s) (uint32_t)(0 \
+ | (' ' << SHIFTsp) \
+ | (('0' + ((s) / 1 % 10)) << SHIFT0) \
+ | (('0' + ((s) / 10 % 10)) << SHIFT1) \
+ | (('0' + ((s) / 100 % 10)) << SHIFT2) \
+)
+
+#define MSG_OK "Operation successful\r\n"
+#define MSG_ERR "Error\r\n"
+
+struct globals {
+ int pasv_listen_fd;
+#if !BB_MMU
+ int root_fd;
+#endif
+ int local_file_fd;
+ unsigned end_time;
+ unsigned timeout;
+ unsigned verbose;
+ off_t local_file_pos;
+ off_t restart_pos;
+ len_and_sockaddr *local_addr;
+ len_and_sockaddr *port_addr;
+ char *ftp_cmd;
+ char *ftp_arg;
+#if ENABLE_FEATURE_FTP_WRITE
+ char *rnfr_filename;
+#endif
+ /* 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 */ \
+ /*strcpy(G.msg_ok + 4, MSG_OK );*/ \
+ /*strcpy(G.msg_err + 4, MSG_ERR);*/ \
+} while (0)
+
+
+static char *
+escape_text(const char *prepend, const char *str, unsigned escapee)
+{
+ unsigned retlen, remainlen, chunklen;
+ char *ret, *found;
+ char append;
+
+ append = (char)escapee;
+ escapee >>= 8;
+
+ remainlen = strlen(str);
+ retlen = strlen(prepend);
+ ret = xmalloc(retlen + remainlen * 2 + 1 + 1);
+ strcpy(ret, prepend);
+
+ for (;;) {
+ found = strchrnul(str, escapee);
+ chunklen = found - str + 1;
+
+ /* Copy chunk up to and including escapee (or NUL) to ret */
+ memcpy(ret + retlen, str, chunklen);
+ retlen += chunklen;
+
+ if (*found == '\0') {
+ /* It wasn't escapee, it was NUL! */
+ ret[retlen - 1] = append; /* replace NUL */
+ ret[retlen] = '\0'; /* add NUL */
+ break;
+ }
+ ret[retlen++] = escapee; /* duplicate escapee */
+ str = found + 1;
+ }
+ return ret;
+}
+
+/* Returns strlen as a bonus */
+static unsigned
+replace_char(char *str, char from, char to)
+{
+ char *p = str;
+ while (*p) {
+ if (*p == from)
+ *p = to;
+ p++;
+ }
+ return p - str;
+}
+
+static void
+verbose_log(const char *str)
+{
+ bb_error_msg("%.*s", (int)strcspn(str, "\r\n"), str);
+}
+
+/* NB: status_str is char[4] packed into uint32_t */
+static void
+cmdio_write(uint32_t status_str, const char *str)
+{
+ char *response;
+ int len;
+
+ /* FTP uses telnet protocol for command link.
+ * In telnet, 0xff is an escape char, and needs to be escaped: */
+ response = escape_text((char *) &status_str, str, (0xff << 8) + '\r');
+
+ /* FTP sends embedded LFs as NULs */
+ len = replace_char(response, '\n', '\0');
+
+ response[len++] = '\n'; /* tack on trailing '\n' */
+ xwrite(STDOUT_FILENO, response, len);
+ if (G.verbose > 1)
+ verbose_log(response);
+ free(response);
+}
+
+static void
+cmdio_write_ok(unsigned status)
+{
+ *(uint32_t *) G.msg_ok = status;
+ xwrite(STDOUT_FILENO, G.msg_ok, sizeof("NNN " MSG_OK) - 1);
+ if (G.verbose > 1)
+ verbose_log(G.msg_ok);
+}
+#define WRITE_OK(a) cmdio_write_ok(STRNUM32sp(a))
+
+/* TODO: output strerr(errno) if errno != 0? */
+static void
+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 > 0)
+ verbose_log(G.msg_err);
+}
+#define WRITE_ERR(a) cmdio_write_error(STRNUM32sp(a))
+
+static void
+cmdio_write_raw(const char *p_text)
+{
+ xwrite_str(STDOUT_FILENO, p_text);
+ if (G.verbose > 1)
+ verbose_log(p_text);
+}
+
+static void
+timeout_handler(int sig UNUSED_PARAM)
+{
+ off_t pos;
+ int sv_errno = errno;
+
+ if ((int)(monotonic_sec() - G.end_time) >= 0)
+ goto timed_out;
+
+ if (!G.local_file_fd)
+ goto timed_out;
+
+ pos = xlseek(G.local_file_fd, 0, SEEK_CUR);
+ if (pos == G.local_file_pos)
+ goto timed_out;
+ G.local_file_pos = pos;
+
+ alarm(G.timeout);
+ errno = sv_errno;
+ return;
+
+ timed_out:
+ cmdio_write_raw(STR(FTP_TIMEOUT)" Timeout\r\n");
+/* TODO: do we need to abort (as opposed to usual shutdown) data transfer? */
+ exit(1);
+}
+
+/* Simple commands */
+
+static void
+handle_pwd(void)
+{
+ char *cwd, *response;
+
+ cwd = xrealloc_getcwd_or_warn(NULL);
+ if (cwd == NULL)
+ cwd = xstrdup("");
+
+ /* We have to promote each " to "" */
+ response = escape_text(" \"", cwd, ('"' << 8) + '"');
+ free(cwd);
+ cmdio_write(STRNUM32(FTP_PWDOK), response);
+ free(response);
+}
+
+static void
+handle_cwd(void)
+{
+ if (!G.ftp_arg || chdir(G.ftp_arg) != 0) {
+ WRITE_ERR(FTP_FILEFAIL);
+ return;
+ }
+ WRITE_OK(FTP_CWDOK);
+}
+
+static void
+handle_cdup(void)
+{
+ G.ftp_arg = (char*)"..";
+ handle_cwd();
+}
+
+static void
+handle_stat(void)
+{
+ cmdio_write_raw(STR(FTP_STATOK)"-Server status:\r\n"
+ " TYPE: BINARY\r\n"
+ STR(FTP_STATOK)" Ok\r\n");
+}
+
+/* Examples of HELP and FEAT:
+# nc -vvv ftp.kernel.org 21
+ftp.kernel.org (130.239.17.4:21) open
+220 Welcome to ftp.kernel.org.
+FEAT
+211-Features:
+ EPRT
+ EPSV
+ MDTM
+ PASV
+ REST STREAM
+ SIZE
+ TVFS
+ UTF8
+211 End
+HELP
+214-The following commands are recognized.
+ ABOR ACCT ALLO APPE CDUP CWD DELE EPRT EPSV FEAT HELP LIST MDTM MKD
+ MODE NLST NOOP OPTS PASS PASV PORT PWD QUIT REIN REST RETR RMD RNFR
+ RNTO SITE SIZE SMNT STAT STOR STOU STRU SYST TYPE USER XCUP XCWD XMKD
+ XPWD XRMD
+214 Help OK.
+*/
+static void
+handle_feat(unsigned status)
+{
+ cmdio_write(status, "-Features:");
+ cmdio_write_raw(" EPSV\r\n"
+ " PASV\r\n"
+ " REST STREAM\r\n"
+ " MDTM\r\n"
+ " SIZE\r\n");
+ cmdio_write(status, " Ok");
+}
+
+/* Download commands */
+
+static inline int
+port_active(void)
+{
+ return (G.port_addr != NULL);
+}
+
+static inline int
+pasv_active(void)
+{
+ return (G.pasv_listen_fd > STDOUT_FILENO);
+}
+
+static void
+port_pasv_cleanup(void)
+{
+ free(G.port_addr);
+ G.port_addr = NULL;
+ if (G.pasv_listen_fd > STDOUT_FILENO)
+ close(G.pasv_listen_fd);
+ G.pasv_listen_fd = -1;
+}
+
+/* On error, emits error code to the peer */
+static int
+ftpdataio_get_pasv_fd(void)
+{
+ int remote_fd;
+
+ remote_fd = accept(G.pasv_listen_fd, NULL, 0);
+
+ if (remote_fd < 0) {
+ WRITE_ERR(FTP_BADSENDCONN);
+ return remote_fd;
+ }
+
+ setsockopt(remote_fd, SOL_SOCKET, SO_KEEPALIVE, &const_int_1, sizeof(const_int_1));
+ return remote_fd;
+}
+
+/* Clears port/pasv data.
+ * This means we dont waste resources, for example, keeping
+ * PASV listening socket open when it is no longer needed.
+ * On error, emits error code to the peer (or exits).
+ * On success, emits p_status_msg to the peer.
+ */
+static int
+get_remote_transfer_fd(const char *p_status_msg)
+{
+ int remote_fd;
+
+ if (pasv_active())
+ /* On error, emits error code to the peer */
+ remote_fd = ftpdataio_get_pasv_fd();
+ else
+ /* Exits on error */
+ remote_fd = xconnect_stream(G.port_addr);
+
+ port_pasv_cleanup();
+
+ if (remote_fd < 0)
+ return remote_fd;
+
+ cmdio_write(STRNUM32(FTP_DATACONN), p_status_msg);
+ return remote_fd;
+}
+
+/* If there were neither PASV nor PORT, emits error code to the peer */
+static int
+port_or_pasv_was_seen(void)
+{
+ if (!pasv_active() && !port_active()) {
+ cmdio_write_raw(STR(FTP_BADSENDCONN)" Use PORT/PASV first\r\n");
+ return 0;
+ }
+
+ return 1;
+}
+
+/* Exits on error */
+static unsigned
+bind_for_passive_mode(void)
+{
+ int fd;
+ unsigned port;
+
+ port_pasv_cleanup();
+
+ G.pasv_listen_fd = fd = xsocket(G.local_addr->u.sa.sa_family, SOCK_STREAM, 0);
+ setsockopt_reuseaddr(fd);
+
+ 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);
+
+ port = get_nport(&G.local_addr->u.sa);
+ port = ntohs(port);
+ return port;
+}
+
+/* Exits on error */
+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(STR(FTP_PASVOK)" PASV ok (%s,%u,%u)\r\n",
+ addr, (int)(port >> 8), (int)(port & 255));
+ free(addr);
+ cmdio_write_raw(response);
+ free(response);
+}
+
+/* Exits on error */
+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);
+}
+
+static void
+handle_port(void)
+{
+ unsigned port, port_hi;
+ char *raw, *comma;
+#ifdef WHY_BOTHER_WE_CAN_ASSUME_IP_MATCHES
+ socklen_t peer_ipv4_len;
+ struct sockaddr_in peer_ipv4;
+ struct in_addr port_ipv4_sin_addr;
+#endif
+
+ port_pasv_cleanup();
+
+ raw = G.ftp_arg;
+
+ /* PORT command format makes sense only over IPv4 */
+ if (!raw
+#ifdef WHY_BOTHER_WE_CAN_ASSUME_IP_MATCHES
+ || G.local_addr->u.sa.sa_family != AF_INET
+#endif
+ ) {
+ bail:
+ WRITE_ERR(FTP_BADCMD);
+ return;
+ }
+
+ comma = strrchr(raw, ',');
+ if (comma == NULL)
+ goto bail;
+ *comma = '\0';
+ port = bb_strtou(&comma[1], NULL, 10);
+ if (errno || port > 0xff)
+ goto bail;
+
+ comma = strrchr(raw, ',');
+ if (comma == NULL)
+ goto bail;
+ *comma = '\0';
+ port_hi = bb_strtou(&comma[1], NULL, 10);
+ if (errno || port_hi > 0xff)
+ goto bail;
+ port |= port_hi << 8;
+
+#ifdef WHY_BOTHER_WE_CAN_ASSUME_IP_MATCHES
+ replace_char(raw, ',', '.');
+
+ /* We are verifying that PORT's IP matches getpeername().
+ * Otherwise peer can make us open data connections
+ * to other hosts (security problem!)
+ * This code would be too simplistic:
+ * lsa = xdotted2sockaddr(raw, port);
+ * if (lsa == NULL) goto bail;
+ */
+ if (!inet_aton(raw, &port_ipv4_sin_addr))
+ goto bail;
+ peer_ipv4_len = sizeof(peer_ipv4);
+ if (getpeername(STDIN_FILENO, &peer_ipv4, &peer_ipv4_len) != 0)
+ goto bail;
+ if (memcmp(&port_ipv4_sin_addr, &peer_ipv4.sin_addr, sizeof(struct in_addr)) != 0)
+ goto bail;
+
+ G.port_addr = xdotted2sockaddr(raw, port);
+#else
+ G.port_addr = get_peer_lsa(STDIN_FILENO);
+ set_nport(&G.port_addr->u.sa, htons(port));
+#endif
+ WRITE_OK(FTP_PORTOK);
+}
+
+static void
+handle_rest(void)
+{
+ /* When ftp_arg == NULL simply restart from beginning */
+ G.restart_pos = G.ftp_arg ? xatoi_positive(G.ftp_arg) : 0;
+ WRITE_OK(FTP_RESTOK);
+}
+
+static void
+handle_retr(void)
+{
+ struct stat statbuf;
+ off_t bytes_transferred;
+ int remote_fd;
+ int local_file_fd;
+ off_t offset = G.restart_pos;
+ char *response;
+
+ G.restart_pos = 0;
+
+ if (!port_or_pasv_was_seen())
+ return; /* port_or_pasv_was_seen emitted error response */
+
+ /* O_NONBLOCK is useful if file happens to be a device node */
+ local_file_fd = G.ftp_arg ? open(G.ftp_arg, O_RDONLY | O_NONBLOCK) : -1;
+ if (local_file_fd < 0) {
+ WRITE_ERR(FTP_FILEFAIL);
+ return;
+ }
+
+ if (fstat(local_file_fd, &statbuf) != 0 || !S_ISREG(statbuf.st_mode)) {
+ /* Note - pretend open failed */
+ WRITE_ERR(FTP_FILEFAIL);
+ goto file_close_out;
+ }
+ G.local_file_fd = local_file_fd;
+
+ /* Now deactive O_NONBLOCK, otherwise we have a problem
+ * on DMAPI filesystems such as XFS DMAPI.
+ */
+ ndelay_off(local_file_fd);
+
+ /* Set the download offset (from REST) if any */
+ if (offset != 0)
+ xlseek(local_file_fd, offset, SEEK_SET);
+
+ response = xasprintf(
+ " Opening BINARY connection for %s (%"OFF_FMT"u bytes)",
+ G.ftp_arg, statbuf.st_size);
+ remote_fd = get_remote_transfer_fd(response);
+ free(response);
+ if (remote_fd < 0)
+ goto file_close_out;
+
+ bytes_transferred = bb_copyfd_eof(local_file_fd, remote_fd);
+ close(remote_fd);
+ if (bytes_transferred < 0)
+ WRITE_ERR(FTP_BADSENDFILE);
+ else
+ WRITE_OK(FTP_TRANSFEROK);
+
+ file_close_out:
+ close(local_file_fd);
+ G.local_file_fd = 0;
+}
+
+/* List commands */
+
+static int
+popen_ls(const char *opt)
+{
+ const char *argv[5];
+ struct fd_pair outfd;
+ pid_t pid;
+
+ argv[0] = "ftpd";
+ argv[1] = opt; /* "-l" or "-1" */
+#if BB_MMU
+ argv[2] = "--";
+#else
+ /* NOMMU ftpd ls helper chdirs to argv[2],
+ * preventing peer from seeing real root. */
+ argv[2] = xrealloc_getcwd_or_warn(NULL);
+#endif
+ argv[3] = G.ftp_arg;
+ argv[4] = NULL;
+
+ /* Improve compatibility with non-RFC conforming FTP clients
+ * 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] == '-'
+ ) {
+ const char *tmp = strchr(G.ftp_arg, ' ');
+ if (tmp) /* skip the space */
+ tmp++;
+ argv[3] = tmp;
+ }
+
+ xpiped_pair(outfd);
+
+ /*fflush_all(); - so far we dont use stdio on output */
+ pid = BB_MMU ? xfork() : xvfork();
+ if (pid == 0) {
+ /* child */
+#if !BB_MMU
+ /* On NOMMU, we want to execute a child - copy of ourself.
+ * In chroot we usually can't do it. Thus we chdir
+ * out of the chroot back to original root,
+ * and (see later below) execute bb_busybox_exec_path
+ * relative to current directory */
+ if (fchdir(G.root_fd) != 0)
+ _exit(127);
+ /*close(G.root_fd); - close_on_exec_on() took care of this */
+#endif
+ /* NB: close _first_, then move fd! */
+ close(outfd.rd);
+ xmove_fd(outfd.wr, STDOUT_FILENO);
+ /* Opening /dev/null in chroot is hard.
+ * Just making sure STDIN_FILENO is opened
+ * to something harmless. Paranoia,
+ * ls won't read it anyway */
+ close(STDIN_FILENO);
+ dup(STDOUT_FILENO); /* copy will become STDIN_FILENO */
+#if BB_MMU
+ /* memset(&G, 0, sizeof(G)); - ls_main does it */
+ exit(ls_main(ARRAY_SIZE(argv) - 1, (char**) argv));
+#else
+ /* + 1: we must use relative path here if in chroot.
+ * For example, execv("/proc/self/exe") will fail, since
+ * it looks for "/proc/self/exe" _relative to chroot!_ */
+ execv(bb_busybox_exec_path + 1, (char**) argv);
+ _exit(127);
+#endif
+ }
+
+ /* parent */
+ close(outfd.wr);
+#if !BB_MMU
+ free((char*)argv[2]);
+#endif
+ return outfd.rd;
+}
+
+enum {
+ USE_CTRL_CONN = 1,
+ LONG_LISTING = 2,
+};
+
+static void
+handle_dir_common(int opts)
+{
+ FILE *ls_fp;
+ char *line;
+ int ls_fd;
+
+ if (!(opts & USE_CTRL_CONN) && !port_or_pasv_was_seen())
+ return; /* port_or_pasv_was_seen emitted error response */
+
+ /* -n prevents user/groupname display,
+ * which can be problematic in chroot */
+ ls_fd = popen_ls((opts & LONG_LISTING) ? "-l" : "-1");
+ ls_fp = xfdopen_for_read(ls_fd);
+
+ if (opts & USE_CTRL_CONN) {
+ /* STAT <filename> */
+ cmdio_write_raw(STR(FTP_STATFILE_OK)"-File status:\r\n");
+ while (1) {
+ line = xmalloc_fgetline(ls_fp);
+ if (!line)
+ break;
+ /* Hack: 0 results in no status at all */
+ /* Note: it's ok that we don't prepend space,
+ * ftp.kernel.org doesn't do that too */
+ cmdio_write(0, line);
+ free(line);
+ }
+ WRITE_OK(FTP_STATFILE_OK);
+ } else {
+ /* LIST/NLST [<filename>] */
+ int remote_fd = get_remote_transfer_fd(" Directory listing");
+ if (remote_fd >= 0) {
+ while (1) {
+ line = xmalloc_fgetline(ls_fp);
+ if (!line)
+ break;
+ /* I've seen clients complaining when they
+ * are fed with ls output with bare '\n'.
+ * Pity... that would be much simpler.
+ */
+/* TODO: need to s/LF/NUL/g here */
+ xwrite_str(remote_fd, line);
+ xwrite(remote_fd, "\r\n", 2);
+ free(line);
+ }
+ }
+ close(remote_fd);
+ WRITE_OK(FTP_TRANSFEROK);
+ }
+ fclose(ls_fp); /* closes ls_fd too */
+}
+static void
+handle_list(void)
+{
+ handle_dir_common(LONG_LISTING);
+}
+static void
+handle_nlst(void)
+{
+ /* NLST returns list of names, "\r\n" terminated without regard
+ * to the current binary flag. Names may start with "/",
+ * then they represent full names (we don't produce such names),
+ * otherwise names are relative to current directory.
+ * Embedded "\n" are replaced by NULs. This is safe since names
+ * can never contain NUL.
+ */
+ handle_dir_common(0);
+}
+static void
+handle_stat_file(void)
+{
+ handle_dir_common(LONG_LISTING + USE_CTRL_CONN);
+}
+
+/* This can be extended to handle MLST, as all info is available
+ * in struct stat for that:
+ * MLST file_name
+ * 250-Listing file_name
+ * type=file;size=4161;modify=19970214165800; /dir/dir/file_name
+ * 250 End
+ * Nano-doc:
+ * MLST [<file or dir name, "." assumed if not given>]
+ * Returned name should be either the same as requested, or fully qualified.
+ * If there was no parameter, return "" or (preferred) fully-qualified name.
+ * Returned "facts" (case is not important):
+ * size - size in octets
+ * modify - last modification time
+ * type - entry type (file,dir,OS.unix=block)
+ * (+ cdir and pdir types for MLSD)
+ * unique - unique id of file/directory (inode#)
+ * perm -
+ * a: can be appended to (APPE)
+ * d: can be deleted (RMD/DELE)
+ * f: can be renamed (RNFR)
+ * r: can be read (RETR)
+ * w: can be written (STOR)
+ * e: can CWD into this dir
+ * l: this dir can be listed (dir only!)
+ * c: can create files in this dir
+ * m: can create dirs in this dir (MKD)
+ * p: can delete files in this dir
+ * UNIX.mode - unix file mode
+ */
+static void
+handle_size_or_mdtm(int need_size)
+{
+ struct stat statbuf;
+ struct tm broken_out;
+ char buf[(sizeof("NNN %"OFF_FMT"u\r\n") + sizeof(off_t) * 3)
+ | sizeof("NNN YYYYMMDDhhmmss\r\n")
+ ];
+
+ if (!G.ftp_arg
+ || stat(G.ftp_arg, &statbuf) != 0
+ || !S_ISREG(statbuf.st_mode)
+ ) {
+ WRITE_ERR(FTP_FILEFAIL);
+ return;
+ }
+ if (need_size) {
+ sprintf(buf, STR(FTP_STATFILE_OK)" %"OFF_FMT"u\r\n", statbuf.st_size);
+ } else {
+ gmtime_r(&statbuf.st_mtime, &broken_out);
+ sprintf(buf, STR(FTP_STATFILE_OK)" %04u%02u%02u%02u%02u%02u\r\n",
+ broken_out.tm_year + 1900,
+ broken_out.tm_mon + 1,
+ broken_out.tm_mday,
+ broken_out.tm_hour,
+ broken_out.tm_min,
+ broken_out.tm_sec);
+ }
+ cmdio_write_raw(buf);
+}
+
+/* Upload commands */
+
+#if ENABLE_FEATURE_FTP_WRITE
+static void
+handle_mkd(void)
+{
+ if (!G.ftp_arg || mkdir(G.ftp_arg, 0777) != 0) {
+ WRITE_ERR(FTP_FILEFAIL);
+ return;
+ }
+ WRITE_OK(FTP_MKDIROK);
+}
+
+static void
+handle_rmd(void)
+{
+ if (!G.ftp_arg || rmdir(G.ftp_arg) != 0) {
+ WRITE_ERR(FTP_FILEFAIL);
+ return;
+ }
+ WRITE_OK(FTP_RMDIROK);
+}
+
+static void
+handle_dele(void)
+{
+ if (!G.ftp_arg || unlink(G.ftp_arg) != 0) {
+ WRITE_ERR(FTP_FILEFAIL);
+ return;
+ }
+ WRITE_OK(FTP_DELEOK);
+}
+
+static void
+handle_rnfr(void)
+{
+ free(G.rnfr_filename);
+ G.rnfr_filename = xstrdup(G.ftp_arg);
+ WRITE_OK(FTP_RNFROK);
+}
+
+static void
+handle_rnto(void)
+{
+ int retval;
+
+ /* If we didn't get a RNFR, throw a wobbly */
+ if (G.rnfr_filename == NULL || G.ftp_arg == NULL) {
+ cmdio_write_raw(STR(FTP_NEEDRNFR)" Use RNFR first\r\n");
+ return;
+ }
+
+ retval = rename(G.rnfr_filename, G.ftp_arg);
+ free(G.rnfr_filename);
+ G.rnfr_filename = NULL;
+
+ if (retval) {
+ WRITE_ERR(FTP_FILEFAIL);
+ return;
+ }
+ WRITE_OK(FTP_RENAMEOK);
+}
+
+static void
+handle_upload_common(int is_append, int is_unique)
+{
+ struct stat statbuf;
+ char *tempname;
+ off_t bytes_transferred;
+ off_t offset;
+ int local_file_fd;
+ int remote_fd;
+
+ offset = G.restart_pos;
+ G.restart_pos = 0;
+
+ if (!port_or_pasv_was_seen())
+ return; /* port_or_pasv_was_seen emitted error response */
+
+ tempname = NULL;
+ local_file_fd = -1;
+ if (is_unique) {
+ tempname = xstrdup(" FILE: uniq.XXXXXX");
+ local_file_fd = mkstemp(tempname + 7);
+ } else if (G.ftp_arg) {
+ int flags = O_WRONLY | O_CREAT | O_TRUNC;
+ if (is_append)
+ flags = O_WRONLY | O_CREAT | O_APPEND;
+ if (offset)
+ flags = O_WRONLY | O_CREAT;
+ local_file_fd = open(G.ftp_arg, flags, 0666);
+ }
+
+ if (local_file_fd < 0
+ || fstat(local_file_fd, &statbuf) != 0
+ || !S_ISREG(statbuf.st_mode)
+ ) {
+ free(tempname);
+ WRITE_ERR(FTP_UPLOADFAIL);
+ if (local_file_fd >= 0)
+ goto close_local_and_bail;
+ return;
+ }
+ G.local_file_fd = local_file_fd;
+
+ if (offset)
+ xlseek(local_file_fd, offset, SEEK_SET);
+
+ remote_fd = get_remote_transfer_fd(tempname ? tempname : " Ok to send data");
+ free(tempname);
+
+ if (remote_fd < 0)
+ goto close_local_and_bail;
+
+ bytes_transferred = bb_copyfd_eof(remote_fd, local_file_fd);
+ close(remote_fd);
+ if (bytes_transferred < 0)
+ WRITE_ERR(FTP_BADSENDFILE);
+ else
+ WRITE_OK(FTP_TRANSFEROK);
+
+ close_local_and_bail:
+ close(local_file_fd);
+ G.local_file_fd = 0;
+}
+
+static void
+handle_stor(void)
+{
+ handle_upload_common(0, 0);
+}
+
+static void
+handle_appe(void)
+{
+ G.restart_pos = 0;
+ handle_upload_common(1, 0);
+}
+
+static void
+handle_stou(void)
+{
+ G.restart_pos = 0;
+ handle_upload_common(0, 1);
+}
+#endif /* ENABLE_FEATURE_FTP_WRITE */
+
+static uint32_t
+cmdio_get_cmd_and_arg(void)
+{
+ int len;
+ uint32_t cmdval;
+ char *cmd;
+
+ alarm(G.timeout);
+
+ free(G.ftp_cmd);
+ {
+ /* 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
+ * data transfer, and may be preceded by telnet's "Interrupt Process"
+ * code (two-byte sequence 255,244) and then by telnet "Synch" code
+ * 255,242 (byte 242 is sent with TCP URG bit using send(MSG_OOB)
+ * and may generate SIGURG on our side. See RFC854).
+ * So far we don't support that (may install SIGURG handler if we'd want to),
+ * but we need to at least remove 255,xxx pairs. lftp sends those. */
+ /* Then de-escape FTP: NUL => '\n' */
+ /* Testing for \xff:
+ * Create file named '\xff': echo Hello >`echo -ne "\xff"`
+ * Try to get it: ftpget -v 127.0.0.1 Eff `echo -ne "\xff\xff"`
+ * (need "\xff\xff" until ftpget applet is fixed to do escaping :)
+ * Testing for embedded LF:
+ * LF_HERE=`echo -ne "LF\nHERE"`
+ * echo Hello >"$LF_HERE"
+ * ftpget -v 127.0.0.1 LF_HERE "$LF_HERE"
+ */
+ {
+ int dst, src;
+
+ /* Strip "\r\n" if it is there */
+ if (len != 0 && cmd[len - 1] == '\n') {
+ len--;
+ if (len != 0 && cmd[len - 1] == '\r')
+ len--;
+ cmd[len] = '\0';
+ }
+ src = strchrnul(cmd, 0xff) - cmd;
+ /* 99,99% there are neither NULs nor 255s and src == len */
+ if (src < len) {
+ dst = src;
+ do {
+ if ((unsigned char)(cmd[src]) == 255) {
+ src++;
+ /* 255,xxx - skip 255 */
+ if ((unsigned char)(cmd[src]) != 255) {
+ /* 255,!255 - skip both */
+ src++;
+ continue;
+ }
+ /* 255,255 - retain one 255 */
+ }
+ /* NUL => '\n' */
+ cmd[dst++] = cmd[src] ? cmd[src] : '\n';
+ src++;
+ } while (src < len);
+ cmd[dst] = '\0';
+ }
+ }
+
+ if (G.verbose > 1)
+ verbose_log(cmd);
+
+ G.ftp_arg = strchr(cmd, ' ');
+ if (G.ftp_arg != NULL)
+ *G.ftp_arg++ = '\0';
+
+ /* Uppercase and pack into uint32_t first word of the command */
+ cmdval = 0;
+ while (*cmd)
+ cmdval = (cmdval << 8) + ((unsigned char)*cmd++ & (unsigned char)~0x20);
+
+ return cmdval;
+}
+
+#define mk_const4(a,b,c,d) (((a * 0x100 + b) * 0x100 + c) * 0x100 + d)
+#define mk_const3(a,b,c) ((a * 0x100 + b) * 0x100 + c)
+enum {
+ const_ALLO = mk_const4('A', 'L', 'L', 'O'),
+ const_APPE = mk_const4('A', 'P', 'P', 'E'),
+ 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_FEAT = mk_const4('F', 'E', 'A', 'T'),
+ const_HELP = mk_const4('H', 'E', 'L', 'P'),
+ const_LIST = mk_const4('L', 'I', 'S', 'T'),
+ const_MDTM = mk_const4('M', 'D', 'T', 'M'),
+ const_MKD = mk_const3('M', 'K', 'D'),
+ const_MODE = mk_const4('M', 'O', 'D', 'E'),
+ const_NLST = mk_const4('N', 'L', 'S', 'T'),
+ const_NOOP = mk_const4('N', 'O', 'O', 'P'),
+ const_PASS = mk_const4('P', 'A', 'S', 'S'),
+ const_PASV = mk_const4('P', 'A', 'S', 'V'),
+ const_PORT = mk_const4('P', 'O', 'R', 'T'),
+ const_PWD = mk_const3('P', 'W', 'D'),
+ const_QUIT = mk_const4('Q', 'U', 'I', 'T'),
+ const_REST = mk_const4('R', 'E', 'S', 'T'),
+ const_RETR = mk_const4('R', 'E', 'T', 'R'),
+ 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'),
+ const_STRU = mk_const4('S', 'T', 'R', 'U'),
+ const_SYST = mk_const4('S', 'Y', 'S', 'T'),
+ const_TYPE = mk_const4('T', 'Y', 'P', 'E'),
+ const_USER = mk_const4('U', 'S', 'E', 'R'),
+
+#if !BB_MMU
+ OPT_l = (1 << 0),
+ OPT_1 = (1 << 1),
+#endif
+ OPT_v = (1 << ((!BB_MMU) * 2 + 0)),
+ OPT_S = (1 << ((!BB_MMU) * 2 + 1)),
+ OPT_w = (1 << ((!BB_MMU) * 2 + 2)) * ENABLE_FEATURE_FTP_WRITE,
+};
+
+int ftpd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+#if !BB_MMU
+int ftpd_main(int argc, char **argv)
+#else
+int ftpd_main(int argc UNUSED_PARAM, char **argv)
+#endif
+{
+ unsigned abs_timeout;
+ unsigned verbose_S;
+ smallint opts;
+
+ INIT_G();
+
+ abs_timeout = 1 * 60 * 60;
+ verbose_S = 0;
+ G.timeout = 2 * 60;
+ opt_complementary = "t+:T+:vv:SS";
+#if BB_MMU
+ opts = getopt32(argv, "vS" IF_FEATURE_FTP_WRITE("w") "t:T:", &G.timeout, &abs_timeout, &G.verbose, &verbose_S);
+#else
+ 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, which may not work in chroot anyway */
+/* TODO: pass -A? It shows dot files */
+/* 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 */
+ return ls_main(argc, argv);
+ }
+#endif
+ if (G.verbose < verbose_S)
+ G.verbose = verbose_S;
+ if (abs_timeout | G.timeout) {
+ if (abs_timeout == 0)
+ abs_timeout = INT_MAX;
+ G.end_time = monotonic_sec() + abs_timeout;
+ if (G.timeout > abs_timeout)
+ G.timeout = abs_timeout;
+ }
+ strcpy(G.msg_ok + 4, MSG_OK );
+ strcpy(G.msg_err + 4, MSG_ERR);
+
+ G.local_addr = get_sock_lsa(STDIN_FILENO);
+ if (!G.local_addr) {
+ /* This is confusing:
+ * bb_error_msg_and_die("stdin is not a socket");
+ * Better: */
+ bb_show_usage();
+ /* Help text says that ftpd must be used as inetd service,
+ * which is by far the most usual cause of get_sock_lsa
+ * failure */
+ }
+
+ if (!(opts & OPT_v))
+ logmode = LOGMODE_NONE;
+ if (opts & OPT_S) {
+ /* LOG_NDELAY is needed since we may chroot later */
+ openlog(applet_name, LOG_PID | LOG_NDELAY, LOG_DAEMON);
+ logmode |= LOGMODE_SYSLOG;
+ }
+ if (logmode)
+ applet_name = xasprintf("%s[%u]", applet_name, (int)getpid());
+
+#if !BB_MMU
+ G.root_fd = xopen("/", O_RDONLY | O_DIRECTORY);
+ close_on_exec_on(G.root_fd);
+#endif
+
+ if (argv[optind]) {
+ xchroot(argv[optind]);
+ }
+
+ //umask(077); - admin can set umask before starting us
+
+ /* Signals. We'll always take -EPIPE rather than a rude signal, thanks */
+ signal(SIGPIPE, SIG_IGN);
+
+ /* Set up options on the command socket (do we need these all? why?) */
+ setsockopt(STDIN_FILENO, IPPROTO_TCP, TCP_NODELAY, &const_int_1, sizeof(const_int_1));
+ setsockopt(STDIN_FILENO, SOL_SOCKET, SO_KEEPALIVE, &const_int_1, sizeof(const_int_1));
+ /* Telnet protocol over command link may send "urgent" data,
+ * we prefer it to be received in the "normal" data stream: */
+ setsockopt(STDIN_FILENO, SOL_SOCKET, SO_OOBINLINE, &const_int_1, sizeof(const_int_1));
+
+ WRITE_OK(FTP_GREET);
+ signal(SIGALRM, timeout_handler);
+
+#ifdef IF_WE_WANT_TO_REQUIRE_LOGIN
+ {
+ smallint user_was_specified = 0;
+ while (1) {
+ uint32_t cmdval = cmdio_get_cmd_and_arg();
+
+ if (cmdval == const_USER) {
+ if (G.ftp_arg == NULL || strcasecmp(G.ftp_arg, "anonymous") != 0)
+ cmdio_write_raw(STR(FTP_LOGINERR)" Server is anonymous only\r\n");
+ else {
+ user_was_specified = 1;
+ cmdio_write_raw(STR(FTP_GIVEPWORD)" Please specify the password\r\n");
+ }
+ } else if (cmdval == const_PASS) {
+ if (user_was_specified)
+ break;
+ cmdio_write_raw(STR(FTP_NEEDUSER)" Login with USER\r\n");
+ } else if (cmdval == const_QUIT) {
+ WRITE_OK(FTP_GOODBYE);
+ return 0;
+ } else {
+ cmdio_write_raw(STR(FTP_LOGINERR)" Login with USER and PASS\r\n");
+ }
+ }
+ }
+ WRITE_OK(FTP_LOGINOK);
+#endif
+
+ /* RFC-959 Section 5.1
+ * The following commands and options MUST be supported by every
+ * server-FTP and user-FTP, except in cases where the underlying
+ * file system or operating system does not allow or support
+ * a particular command.
+ * Type: ASCII Non-print, IMAGE, LOCAL 8
+ * Mode: Stream
+ * Structure: File, Record*
+ * (Record structure is REQUIRED only for hosts whose file
+ * systems support record structure).
+ * Commands:
+ * USER, PASS, ACCT, [bbox: ACCT not supported]
+ * PORT, PASV,
+ * TYPE, MODE, STRU,
+ * RETR, STOR, APPE,
+ * RNFR, RNTO, DELE,
+ * CWD, CDUP, RMD, MKD, PWD,
+ * LIST, NLST,
+ * SYST, STAT,
+ * HELP, NOOP, QUIT.
+ */
+ /* ACCOUNT (ACCT)
+ * "The argument field is a Telnet string identifying the user's account.
+ * The command is not necessarily related to the USER command, as some
+ * sites may require an account for login and others only for specific
+ * access, such as storing files. In the latter case the command may
+ * arrive at any time.
+ * There are reply codes to differentiate these cases for the automation:
+ * when account information is required for login, the response to
+ * a successful PASSword command is reply code 332. On the other hand,
+ * if account information is NOT required for login, the reply to
+ * a successful PASSword command is 230; and if the account information
+ * is needed for a command issued later in the dialogue, the server
+ * should return a 332 or 532 reply depending on whether it stores
+ * (pending receipt of the ACCounT command) or discards the command,
+ * respectively."
+ */
+
+ while (1) {
+ uint32_t cmdval = cmdio_get_cmd_and_arg();
+
+ if (cmdval == const_QUIT) {
+ WRITE_OK(FTP_GOODBYE);
+ return 0;
+ }
+ else if (cmdval == const_USER)
+ /* This would mean "ok, now give me PASS". */
+ /*WRITE_OK(FTP_GIVEPWORD);*/
+ /* vsftpd can be configured to not require that,
+ * and this also saves one roundtrip:
+ */
+ WRITE_OK(FTP_LOGINOK);
+ else if (cmdval == const_PASS)
+ WRITE_OK(FTP_LOGINOK);
+ else if (cmdval == const_NOOP)
+ WRITE_OK(FTP_NOOPOK);
+ else if (cmdval == const_TYPE)
+ WRITE_OK(FTP_TYPEOK);
+ else if (cmdval == const_STRU)
+ WRITE_OK(FTP_STRUOK);
+ else if (cmdval == const_MODE)
+ WRITE_OK(FTP_MODEOK);
+ else if (cmdval == const_ALLO)
+ 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();
+ /* HELP is nearly useless, but we can reuse FEAT for it */
+ /* lftp uses FEAT */
+ else if (cmdval == const_HELP || cmdval == const_FEAT)
+ handle_feat(cmdval == const_HELP
+ ? STRNUM32(FTP_HELP)
+ : STRNUM32(FTP_STATOK)
+ );
+ else if (cmdval == const_LIST) /* ls -l */
+ handle_list();
+ else if (cmdval == const_NLST) /* "name list", bare ls */
+ handle_nlst();
+ /* SIZE is crucial for wget's download indicator etc */
+ /* Mozilla, lftp use MDTM (presumably for caching) */
+ else if (cmdval == const_SIZE || cmdval == const_MDTM)
+ handle_size_or_mdtm(cmdval == const_SIZE);
+ else if (cmdval == const_STAT) {
+ if (G.ftp_arg == NULL)
+ handle_stat();
+ else
+ handle_stat_file();
+ }
+ 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 (opts & OPT_w) {
+ if (cmdval == const_STOR)
+ handle_stor();
+ else if (cmdval == const_MKD)
+ handle_mkd();
+ else if (cmdval == const_RMD)
+ handle_rmd();
+ else if (cmdval == const_DELE)
+ handle_dele();
+ else if (cmdval == const_RNFR) /* "rename from" */
+ handle_rnfr();
+ else if (cmdval == const_RNTO) /* "rename to" */
+ handle_rnto();
+ else if (cmdval == const_APPE)
+ handle_appe();
+ else if (cmdval == const_STOU) /* "store unique" */
+ handle_stou();
+ else
+ goto bad_cmd;
+ }
+#endif
+#if 0
+ else if (cmdval == const_STOR
+ || cmdval == const_MKD
+ || cmdval == const_RMD
+ || cmdval == const_DELE
+ || cmdval == const_RNFR
+ || cmdval == const_RNTO
+ || cmdval == const_APPE
+ || cmdval == const_STOU
+ ) {
+ cmdio_write_raw(STR(FTP_NOPERM)" Permission denied\r\n");
+ }
+#endif
+ else {
+ /* Which unsupported commands were seen in the wild?
+ * (doesn't necessarily mean "we must support them")
+ * foo 1.2.3: XXXX - comment
+ */
+#if ENABLE_FEATURE_FTP_WRITE
+ bad_cmd:
+#endif
+ cmdio_write_raw(STR(FTP_BADCMD)" Unknown command\r\n");
+ }
+ }
+}