| /* 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 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. |
| */ |
| |
| #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]; |
| }; |
| #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 > 1) |
| 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, 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); |
| } |
| |
| /* 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) |
| { |
| 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, 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_u(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) |
| { |
| char *cwd; |
| const char *argv[] = { |
| "ftpd", |
| opt, |
| BB_MMU ? "--" : NULL, |
| G.ftp_arg, |
| NULL |
| }; |
| struct fd_pair outfd; |
| pid_t pid; |
| |
| cwd = xrealloc_getcwd_or_warn(NULL); |
| xpiped_pair(outfd); |
| |
| /*fflush(NULL); - 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"); |
| |
| if (pid == 0) { |
| /* child */ |
| #if !BB_MMU |
| if (fchdir(G.root_fd) != 0) |
| _exit(127); |
| close(G.root_fd); |
| #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 |
| /* ftpd ls helper chdirs to argv[2], |
| * preventing peer from seeing real root we are in now |
| */ |
| argv[2] = cwd; |
| /* + 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); |
| #else |
| memset(&G, 0, sizeof(G)); |
| exit(ls_main(ARRAY_SIZE(argv) - 1, (char**) argv)); |
| #endif |
| } |
| |
| /* parent */ |
| close(outfd.wr); |
| free(cwd); |
| 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 = fdopen(ls_fd, "r"); |
| if (!ls_fp) /* never happens. paranoia */ |
| bb_perror_msg_and_die("fdopen"); |
| |
| 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, |
| 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) |
| ) { |
| 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) |
| { |
| size_t 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); |
| |
| /* 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 too? */ |
| /* --group-directories-first would be nice, but ls don't do that yet */ |
| xchdir(argv[2]); |
| argv[2] = (char*)"--"; |
| memset(&G, 0, sizeof(G)); |
| 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); |
| #endif |
| |
| if (argv[optind]) { |
| xchdir(argv[optind]); |
| chroot("."); |
| } |
| |
| //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"); |
| } |
| } |
| } |