2 * Copyright (C) 1997 Andre Noll <maan@tuebingen.mpg.de>
4 * Licensed under the GPL v2. For licencing details see COPYING.
7 /** \file command.c Client authentication and server commands. */
9 #include <netinet/in.h>
10 #include <sys/socket.h>
13 #include <sys/types.h>
15 #include <arpa/inet.h>
24 #include "server.cmdline.h"
37 #include "user_list.h"
38 #include "server.command_list.h"
39 #include "afs.command_list.h"
43 /* Defines one command of para_server. */
44 struct server_command {
45 /* The name of the command. */
47 /* Pointer to the function that handles the command. */
48 int (*handler)(struct command_context *);
49 /* The privileges a user must have to execute this command. */
51 /* One-line description of the command. */
52 const char *description;
53 /* Summary of the command line options. */
55 /* The long help text. */
59 static struct server_command afs_cmds[] = {DEFINE_AFS_CMD_ARRAY};
60 static struct server_command server_cmds[] = {DEFINE_SERVER_CMD_ARRAY};
62 /** Commands including options must be shorter than this. */
63 #define MAX_COMMAND_LEN 32768
66 extern struct misc_meta_data *mmd;
67 extern struct sender senders[];
68 int send_afs_status(struct command_context *cc, int parser_friendly);
70 static void dummy(__a_unused int s)
74 static void mmd_dup(struct misc_meta_data *new_mmd)
76 mutex_lock(mmd_mutex);
78 mutex_unlock(mmd_mutex);
82 * Compute human readable string containing vss status for given integer value.
84 * We don't want to use vss_playing() and friends here because we take a
85 * snapshot of the mmd struct and use the copy for computing the state of the
86 * vss. If the real data were used, we would take the mmd lock for a rather
87 * long time or risk to get an inconsistent view.
89 static char *vss_status_tohuman(unsigned int flags)
91 if (flags & VSS_PLAYING)
92 return para_strdup("playing");
94 return para_strdup("stopped");
95 return para_strdup("paused");
99 * return human readable permission string. Never returns NULL.
101 static char *cmd_perms_itohuman(unsigned int perms)
103 char *msg = para_malloc(5 * sizeof(char));
105 msg[0] = perms & AFS_READ? 'a' : '-';
106 msg[1] = perms & AFS_WRITE? 'A' : '-';
107 msg[2] = perms & VSS_READ? 'v' : '-';
108 msg[3] = perms & VSS_WRITE? 'V' : '-';
114 * Never returns NULL.
116 static char *vss_get_status_flags(unsigned int flags)
118 char *msg = para_malloc(5 * sizeof(char));
120 msg[0] = (flags & VSS_PLAYING)? 'P' : '_';
121 msg[1] = (flags & VSS_NOMORE)? 'O' : '_';
122 msg[2] = (flags & VSS_NEXT)? 'N' : '_';
123 msg[3] = (flags & VSS_REPOS)? 'R' : '_';
128 static unsigned get_status(struct misc_meta_data *nmmd, int parser_friendly,
131 char *status, *flags; /* vss status info */
132 /* nobody updates our version of "now" */
133 long offset = (nmmd->offset + 500) / 1000;
134 struct timeval current_time;
135 struct para_buffer b = {.flags = parser_friendly? PBF_SIZE_PREFIX : 0};
137 /* report real status */
138 status = vss_status_tohuman(nmmd->vss_status_flags);
139 flags = vss_get_status_flags(nmmd->vss_status_flags);
140 clock_get_realtime(¤t_time);
142 * The calls to WRITE_STATUS_ITEM() below never fail because
143 * b->max_size is zero (unlimited), see para_printf(). However, clang
144 * is not smart enough to prove this and complains nevertheless.
145 * Casting the return value to void silences clang.
147 (void)WRITE_STATUS_ITEM(&b, SI_STATUS, "%s\n", status);
148 (void)WRITE_STATUS_ITEM(&b, SI_STATUS_FLAGS, "%s\n", flags);
149 (void)WRITE_STATUS_ITEM(&b, SI_OFFSET, "%li\n", offset);
150 (void)WRITE_STATUS_ITEM(&b, SI_AFS_MODE, "%s\n", mmd->afs_mode_string);
151 (void)WRITE_STATUS_ITEM(&b, SI_STREAM_START, "%lu.%lu\n",
152 (long unsigned)nmmd->stream_start.tv_sec,
153 (long unsigned)nmmd->stream_start.tv_usec);
154 (void)WRITE_STATUS_ITEM(&b, SI_CURRENT_TIME, "%lu.%lu\n",
155 (long unsigned)current_time.tv_sec,
156 (long unsigned)current_time.tv_usec);
163 static int check_sender_args(int argc, char * const * argv, struct sender_command_data *scd)
166 /* this has to match sender.h */
167 const char *subcmds[] = {"add", "delete", "allow", "deny", "on", "off", NULL};
169 scd->sender_num = -1;
171 return -E_COMMAND_SYNTAX;
172 for (i = 0; senders[i].name; i++)
173 if (!strcmp(senders[i].name, argv[1]))
175 PARA_DEBUG_LOG("%d:%s\n", argc, argv[1]);
176 if (!senders[i].name)
177 return -E_COMMAND_SYNTAX;
179 for (i = 0; subcmds[i]; i++)
180 if (!strcmp(subcmds[i], argv[2]))
183 return -E_COMMAND_SYNTAX;
185 if (!senders[scd->sender_num].client_cmds[scd->cmd_num])
186 return -E_SENDER_CMD;
187 switch (scd->cmd_num) {
191 return -E_COMMAND_SYNTAX;
195 if (argc != 4 || parse_cidr(argv[3], scd->host,
196 sizeof(scd->host), &scd->netmask) == NULL)
197 return -E_COMMAND_SYNTAX;
202 return -E_COMMAND_SYNTAX;
203 return parse_fec_url(argv[3], scd);
205 return -E_COMMAND_SYNTAX;
211 * Send a sideband packet through a blocking file descriptor.
213 * \param scc fd and crypto keys.
214 * \param buf The buffer to send.
215 * \param numbytes The size of \a buf.
216 * \param band The sideband designator of this packet.
217 * \param dont_free If true, never deallocate \a buf.
219 * The nonblock flag must be disabled for the file descriptor given by \a scc.
221 * Stream cipher encryption is automatically activated if necessary via the
222 * sideband transformation, depending on the value of \a band.
226 * \sa \ref send_sb_va().
228 int send_sb(struct stream_cipher_context *scc, void *buf, size_t numbytes,
229 int band, bool dont_free)
232 struct sb_context *sbc;
234 sb_transformation trafo = band < SBD_PROCEED? NULL : sc_trafo;
235 struct sb_buffer sbb = SBB_INIT(band, buf, numbytes);
237 sbc = sb_new_send(&sbb, dont_free, trafo, scc->send);
239 ret = sb_get_send_buffers(sbc, iov);
240 ret = xwritev(scc->fd, iov, ret);
243 } while (sb_sent(sbc, ret) == false);
251 * Create a variable sized buffer and send it as a sideband packet.
253 * \param scc Passed to \ref send_sb.
254 * \param band See \ref send_sb.
255 * \param fmt The format string.
257 * \return The return value of the underlying call to \ref send_sb.
259 __printf_3_4 int send_sb_va(struct stream_cipher_context *scc, int band,
260 const char *fmt, ...)
267 ret = xvasprintf(&msg, fmt, ap);
269 return send_sb(scc, msg, ret, band, false);
273 * Send an error message to a client.
275 * \param cc Client info.
276 * \param err The (positive) error code.
278 * \return The return value of the underlying call to send_sb_va().
280 int send_strerror(struct command_context *cc, int err)
282 return send_sb_va(&cc->scc, SBD_ERROR_LOG, "%s\n", para_strerror(err));
286 * Send a sideband packet through a blocking file descriptor.
288 * \param scc fd and crypto keys.
289 * \param expected_band The expected band designator.
290 * \param max_size Passed to \ref sb_new_recv().
291 * \param result Body of the sideband packet is returned here.
293 * If \a expected_band is not \p SBD_ANY, the band designator of the received
294 * sideband packet is compared to \a expected_band and a mismatch is considered
299 int recv_sb(struct stream_cipher_context *scc,
300 enum sb_designator expected_band,
301 size_t max_size, struct iovec *result)
304 struct sb_context *sbc;
306 struct sb_buffer sbb;
307 sb_transformation trafo;
309 trafo = expected_band != SBD_ANY && expected_band < SBD_PROCEED?
311 sbc = sb_new_recv(max_size, trafo, scc->recv);
313 sb_get_recv_buffer(sbc, &iov);
314 ret = recv_bin_buffer(scc->fd, iov.iov_base, iov.iov_len);
319 ret = sb_received(sbc, ret, &sbb);
326 if (expected_band != SBD_ANY && sbb.band != expected_band)
335 static int com_sender(struct command_context *cc)
339 struct sender_command_data scd;
342 for (i = 0; senders[i].name; i++) {
344 ret = xasprintf(&tmp, "%s%s\n", msg? msg : "",
349 return send_sb(&cc->scc, msg, ret, SBD_OUTPUT, false);
351 ret = check_sender_args(cc->argc, cc->argv, &scd);
353 if (scd.sender_num < 0)
355 if (strcmp(cc->argv[2], "status") == 0)
356 msg = senders[scd.sender_num].status();
358 msg = senders[scd.sender_num].help();
359 return send_sb(&cc->scc, msg, strlen(msg), SBD_OUTPUT, false);
362 switch (scd.cmd_num) {
365 assert(senders[scd.sender_num].resolve_target);
366 ret = senders[scd.sender_num].resolve_target(cc->argv[3], &scd);
371 for (i = 0; i < 10; i++) {
372 mutex_lock(mmd_mutex);
373 if (mmd->sender_cmd_data.cmd_num >= 0) {
374 /* another sender command is active, retry in 100ms */
375 struct timespec ts = {.tv_nsec = 100 * 1000 * 1000};
376 mutex_unlock(mmd_mutex);
377 nanosleep(&ts, NULL);
380 mmd->sender_cmd_data = scd;
381 mutex_unlock(mmd_mutex);
384 return (i < 10)? 1 : -E_LOCK;
388 static int com_si(struct command_context *cc)
394 return -E_COMMAND_SYNTAX;
395 mutex_lock(mmd_mutex);
396 ut = daemon_get_uptime_str(now);
397 ret = xasprintf(&msg,
398 "up: %s\nplayed: %u\n"
401 "connections (active/accepted/total): %u/%u/%u\n"
402 "current loglevel: %s\n"
403 "supported audio formats: %s\n",
407 mmd->active_connections,
411 AUDIO_FORMAT_HANDLERS
413 mutex_unlock(mmd_mutex);
415 return send_sb(&cc->scc, msg, ret, SBD_OUTPUT, false);
419 static int com_version(struct command_context *cc)
425 return -E_COMMAND_SYNTAX;
426 len = xasprintf(&msg, "%s", version_text("server"));
427 return send_sb(&cc->scc, msg, len, SBD_OUTPUT, false);
430 /** These status items are cleared if no audio file is currently open. */
431 #define EMPTY_STATUS_ITEMS \
436 ITEM(ATTRIBUTES_BITMAP) \
437 ITEM(ATTRIBUTES_TXT) \
448 ITEM(SECONDS_TOTAL) \
461 ITEM(AMPLIFICATION) \
464 * Write a list of audio-file related status items with empty values.
466 * This is used by vss when currently no audio file is open.
468 static unsigned empty_status_items(int parser_friendly, char **result)
474 len = xasprintf(&esi,
475 #define ITEM(x) "0004 %02x:\n"
478 #define ITEM(x) , SI_ ## x
483 len = xasprintf(&esi,
484 #define ITEM(x) "%s:\n"
487 #define ITEM(x) ,status_item_list[SI_ ## x]
494 #undef EMPTY_STATUS_ITEMS
497 static int com_stat(struct command_context *cc)
500 struct misc_meta_data tmp, *nmmd = &tmp;
503 int parser_friendly = 0;
505 para_sigaction(SIGUSR1, dummy);
507 for (i = 1; i < cc->argc; i++) {
508 const char *arg = cc->argv[i];
511 if (!strcmp(arg, "--")) {
515 if (!strncmp(arg, "-n=", 3)) {
516 ret = para_atoi32(arg + 3, &num);
521 if (!strcmp(arg, "-p")) {
525 return -E_COMMAND_SYNTAX;
528 return -E_COMMAND_SYNTAX;
531 ret = get_status(nmmd, parser_friendly, &s);
532 ret = send_sb(&cc->scc, s, ret, SBD_OUTPUT, false);
535 if (nmmd->vss_status_flags & VSS_NEXT) {
537 ret = empty_status_items(parser_friendly, &esi);
538 ret = send_sb(&cc->scc, esi, ret, SBD_OUTPUT, false);
542 send_afs_status(cc, parser_friendly);
544 if (num > 0 && !--num)
547 ret = -E_SERVER_CRASH;
555 static int send_list_of_commands(struct command_context *cc, struct server_command *cmd,
560 for (; cmd->name; cmd++) {
561 char *tmp, *perms = cmd_perms_itohuman(cmd->perms);
562 tmp = make_message("%s\t%s\t%s\t%s\n", cmd->name, handler,
563 perms, cmd->description);
565 msg = para_strcat(msg, tmp);
569 return send_sb(&cc->scc, msg, strlen(msg), SBD_OUTPUT, false);
572 /* returns string that must be freed by the caller */
573 static struct server_command *get_cmd_ptr(const char *name, char **handler)
575 struct server_command *cmd;
577 for (cmd = server_cmds; cmd->name; cmd++)
578 if (!strcmp(cmd->name, name)) {
580 *handler = para_strdup("server"); /* server commands */
583 /* not found, look for commands supported by afs */
584 for (cmd = afs_cmds; cmd->name; cmd++)
585 if (!strcmp(cmd->name, name)) {
587 *handler = para_strdup("afs");
594 static int com_help(struct command_context *cc)
596 struct server_command *cmd;
597 char *perms, *handler, *buf;
601 /* no argument given, print list of commands */
602 if ((ret = send_list_of_commands(cc, server_cmds, "server")) < 0)
604 return send_list_of_commands(cc, afs_cmds, "afs");
606 /* argument given for help */
607 cmd = get_cmd_ptr(cc->argv[1], &handler);
610 perms = cmd_perms_itohuman(cmd->perms);
611 ret = xasprintf(&buf, "%s - %s\n\n"
625 return send_sb(&cc->scc, buf, ret, SBD_OUTPUT, false);
629 static int com_hup(struct command_context *cc)
632 return -E_COMMAND_SYNTAX;
633 kill(getppid(), SIGHUP);
638 static int com_term(struct command_context *cc)
641 return -E_COMMAND_SYNTAX;
642 kill(getppid(), SIGTERM);
646 static int com_play(struct command_context *cc)
649 return -E_COMMAND_SYNTAX;
650 mutex_lock(mmd_mutex);
651 mmd->new_vss_status_flags |= VSS_PLAYING;
652 mmd->new_vss_status_flags &= ~VSS_NOMORE;
653 mutex_unlock(mmd_mutex);
658 static int com_stop(struct command_context *cc)
661 return -E_COMMAND_SYNTAX;
662 mutex_lock(mmd_mutex);
663 mmd->new_vss_status_flags &= ~VSS_PLAYING;
664 mmd->new_vss_status_flags &= ~VSS_REPOS;
665 mmd->new_vss_status_flags |= VSS_NEXT;
666 mutex_unlock(mmd_mutex);
671 static int com_pause(struct command_context *cc)
674 return -E_COMMAND_SYNTAX;
675 mutex_lock(mmd_mutex);
676 if (!vss_paused() && !vss_stopped()) {
678 mmd->new_vss_status_flags &= ~VSS_PLAYING;
679 mmd->new_vss_status_flags &= ~VSS_NEXT;
681 mutex_unlock(mmd_mutex);
686 static int com_next(struct command_context *cc)
689 return -E_COMMAND_SYNTAX;
690 mutex_lock(mmd_mutex);
692 mmd->new_vss_status_flags |= VSS_NEXT;
693 mutex_unlock(mmd_mutex);
698 static int com_nomore(struct command_context *cc)
701 return -E_COMMAND_SYNTAX;
702 mutex_lock(mmd_mutex);
703 if (vss_playing() || vss_paused())
704 mmd->new_vss_status_flags |= VSS_NOMORE;
705 mutex_unlock(mmd_mutex);
710 static int com_ff(struct command_context *cc)
713 int ret, backwards = 0;
718 return -E_COMMAND_SYNTAX;
719 if (!(ret = sscanf(cc->argv[1], "%u%c", &i, &c)))
720 return -E_COMMAND_SYNTAX;
721 if (ret > 1 && c == '-')
722 backwards = 1; /* jmp backwards */
723 mutex_lock(mmd_mutex);
724 ret = -E_NO_AUDIO_FILE;
725 if (!mmd->afd.afhi.chunks_total || !mmd->afd.afhi.seconds_total)
727 promille = (1000 * mmd->current_chunk) / mmd->afd.afhi.chunks_total;
729 promille -= 1000 * i / mmd->afd.afhi.seconds_total;
731 promille += 1000 * i / mmd->afd.afhi.seconds_total;
734 if (promille > 1000) {
735 mmd->new_vss_status_flags |= VSS_NEXT;
738 mmd->repos_request = (mmd->afd.afhi.chunks_total * promille) / 1000;
739 mmd->new_vss_status_flags |= VSS_REPOS;
740 mmd->new_vss_status_flags &= ~VSS_NEXT;
744 mutex_unlock(mmd_mutex);
749 static int com_jmp(struct command_context *cc)
755 return -E_COMMAND_SYNTAX;
756 if (sscanf(cc->argv[1], "%lu", &i) <= 0)
757 return -E_COMMAND_SYNTAX;
758 mutex_lock(mmd_mutex);
759 ret = -E_NO_AUDIO_FILE;
760 if (!mmd->afd.afhi.chunks_total)
764 PARA_INFO_LOG("jumping to %lu%%\n", i);
765 mmd->repos_request = (mmd->afd.afhi.chunks_total * i + 50) / 100;
766 PARA_INFO_LOG("sent: %lu, offset before jmp: %lu\n",
767 mmd->chunks_sent, mmd->offset);
768 mmd->new_vss_status_flags |= VSS_REPOS;
769 mmd->new_vss_status_flags &= ~VSS_NEXT;
773 mutex_unlock(mmd_mutex);
777 static int com_tasks(struct command_context *cc)
779 char *tl = server_get_tasks();
783 ret = send_sb(&cc->scc, tl, strlen(tl), SBD_OUTPUT, false);
788 * check if perms are sufficient to exec a command having perms cmd_perms.
789 * Returns 0 if perms are sufficient, -E_PERM otherwise.
791 static int check_perms(unsigned int perms, const struct server_command *cmd_ptr)
793 PARA_DEBUG_LOG("checking permissions\n");
794 return (cmd_ptr->perms & perms) < cmd_ptr->perms ? -E_PERM : 0;
797 static void reset_signals(void)
799 para_sigaction(SIGCHLD, SIG_IGN);
800 para_sigaction(SIGINT, SIG_DFL);
801 para_sigaction(SIGTERM, SIG_DFL);
802 para_sigaction(SIGHUP, SIG_DFL);
805 struct connection_features {
806 bool sideband_requested;
807 bool aes_ctr128_requested;
810 static int parse_auth_request(char *buf, int len, struct user **u,
811 struct connection_features *cf)
814 char *p, *username, **features = NULL;
815 size_t auth_rq_len = strlen(AUTH_REQUEST_MSG);
818 memset(cf, 0, sizeof(*cf));
819 if (len < auth_rq_len + 2)
820 return -E_AUTH_REQUEST;
821 if (strncmp(buf, AUTH_REQUEST_MSG, auth_rq_len) != 0)
822 return -E_AUTH_REQUEST;
823 username = buf + auth_rq_len;
824 p = strchr(username, ' ');
828 return -E_AUTH_REQUEST;
831 create_argv(p, ",", &features);
832 for (i = 0; features[i]; i++) {
833 if (strcmp(features[i], "sideband") == 0)
834 cf->sideband_requested = true;
835 else if (strcmp(features[i], "aes_ctr128") == 0)
836 cf->aes_ctr128_requested = true;
838 ret = -E_BAD_FEATURE;
843 PARA_DEBUG_LOG("received auth request for user %s\n", username);
844 *u = lookup_user(username);
851 #define HANDSHAKE_BUFSIZE 4096
853 static int parse_sb_command(struct command_context *cc, struct iovec *iov)
859 if (iov->iov_base == NULL || iov->iov_len == 0)
862 p[iov->iov_len - 1] = '\0'; /* just to be sure */
863 cc->cmd = get_cmd_ptr(p, NULL);
866 ret = check_perms(cc->u->perms, cc->cmd);
869 end = iov->iov_base + iov->iov_len;
870 for (i = 0; p < end; i++)
873 cc->argv = para_malloc((cc->argc + 1) * sizeof(char *));
874 for (i = 0, p = iov->iov_base; p < end; i++) {
875 cc->argv[i] = para_strdup(p);
878 cc->argv[cc->argc] = NULL;
886 * Perform user authentication and execute a command.
888 * \param fd The file descriptor to send output to.
889 * \param peername Identifies the connecting peer.
891 * Whenever para_server accepts an incoming tcp connection on the port it
892 * listens on, it forks and the resulting child calls this function.
894 * An RSA-based challenge/response is used to authenticate the peer. It that
895 * authentication succeeds, a random session key is generated and sent back to
896 * the peer, encrypted with its RSA public key. From this point on, all
897 * transfers are crypted with this session key.
899 * Next it is checked if the peer supplied a valid server command or a command
900 * for the audio file selector. If yes, and if the user has sufficient
901 * permissions to execute that command, the function calls the corresponding
902 * command handler which does argument checking and further processing.
904 * In order to cope with a DOS attacks, a timeout is set up which terminates
905 * the function if the connection was not authenticated when the timeout
908 * \sa alarm(2), crypt.c, crypt.h
910 __noreturn void handle_connect(int fd, const char *peername)
913 unsigned char rand_buf[CHALLENGE_SIZE + 2 * SESSION_KEY_LEN];
914 unsigned char challenge_hash[HASH_SIZE];
915 char *command = NULL, *buf = para_malloc(HANDSHAKE_BUFSIZE) /* must be on the heap */;
917 struct command_context cc_struct = {.peer = peername}, *cc = &cc_struct;
919 struct connection_features cf;
923 /* we need a blocking fd here as recv() might return EAGAIN otherwise. */
924 ret = mark_fd_blocking(fd);
927 /* send Welcome message */
928 ret = write_va_buffer(fd, "This is para_server, version "
929 PACKAGE_VERSION ".\n"
930 "Features: sideband,aes_ctr128\n"
934 /* recv auth request line */
935 ret = recv_buffer(fd, buf, HANDSHAKE_BUFSIZE);
938 ret = parse_auth_request(buf, ret, &cc->u, &cf);
941 if (!cf.sideband_requested) { /* sideband is mandatory */
942 PARA_ERROR_LOG("client did not request sideband\n");
943 ret = -E_BAD_FEATURE;
947 get_random_bytes_or_die(rand_buf, sizeof(rand_buf));
948 ret = pub_encrypt(cc->u->pubkey, rand_buf, sizeof(rand_buf),
949 (unsigned char *)buf);
955 * We don't want to reveal our user names, so we send a
956 * challenge to the client even if the user does not exist, and
957 * fail the authentication later.
960 get_random_bytes_or_die((unsigned char *)buf, numbytes);
962 PARA_DEBUG_LOG("sending %u byte challenge + session key (%zu bytes)\n",
963 CHALLENGE_SIZE, numbytes);
964 ret = send_sb(&cc->scc, buf, numbytes, SBD_CHALLENGE, false);
968 ret = recv_sb(&cc->scc, SBD_CHALLENGE_RESPONSE,
969 HANDSHAKE_BUFSIZE, &iov);
973 numbytes = iov.iov_len;
974 PARA_DEBUG_LOG("received %zu bytes challenge response\n", numbytes);
979 * The correct response is the hash of the first CHALLENGE_SIZE bytes
980 * of the random data.
983 if (numbytes != HASH_SIZE)
985 hash_function((char *)rand_buf, CHALLENGE_SIZE, challenge_hash);
986 if (memcmp(challenge_hash, buf, HASH_SIZE))
988 /* auth successful */
990 PARA_INFO_LOG("good auth for %s\n", cc->u->name);
991 /* init stream cipher keys with the second part of the random buffer */
992 cc->scc.recv = sc_new(rand_buf + CHALLENGE_SIZE, SESSION_KEY_LEN,
993 cf.aes_ctr128_requested);
994 cc->scc.send = sc_new(rand_buf + CHALLENGE_SIZE + SESSION_KEY_LEN,
995 SESSION_KEY_LEN, cf.aes_ctr128_requested);
996 ret = send_sb(&cc->scc, NULL, 0, SBD_PROCEED, false);
999 ret = recv_sb(&cc->scc, SBD_COMMAND, MAX_COMMAND_LEN, &iov);
1002 ret = parse_sb_command(cc, &iov);
1006 PARA_NOTICE_LOG("calling com_%s() for %s@%s\n", cc->cmd->name,
1007 cc->u->name, peername);
1008 ret = cc->cmd->handler(cc);
1009 free_argv(cc->argv);
1010 mutex_lock(mmd_mutex);
1011 mmd->num_commands++;
1012 mutex_unlock(mmd_mutex);
1016 if (send_strerror(cc, -ret) >= 0)
1017 send_sb(&cc->scc, NULL, 0, SBD_EXIT__FAILURE, true);
1019 PARA_NOTICE_LOG("%s\n", para_strerror(-ret));
1023 mutex_lock(mmd_mutex);
1024 if (cc->cmd && (cc->cmd->perms & AFS_WRITE) && ret >= 0)
1026 mmd->active_connections--;
1027 mutex_unlock(mmd_mutex);
1029 ret = send_sb(&cc->scc, NULL, 0, SBD_EXIT__SUCCESS, true);
1031 PARA_NOTICE_LOG("%s\n", para_strerror(-ret));
1033 sc_free(cc->scc.recv);
1034 sc_free(cc->scc.send);
1035 exit(ret < 0? EXIT_FAILURE : EXIT_SUCCESS);