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 typedef int server_command_handler_t(struct command_context *);
44 static server_command_handler_t SERVER_COMMAND_HANDLERS;
45 server_command_handler_t AFS_COMMAND_HANDLERS;
47 /* Defines one command of para_server. */
48 struct server_command {
49 /* The name of the command. */
51 /* Pointer to the function that handles the command. */
52 server_command_handler_t *handler;
53 /* The privileges a user must have to execute this command. */
55 /* One-line description of the command. */
56 const char *description;
57 /* Summary of the command line options. */
59 /* The long help text. */
63 static struct server_command afs_cmds[] = {DEFINE_AFS_CMD_ARRAY};
64 static struct server_command server_cmds[] = {DEFINE_SERVER_CMD_ARRAY};
66 /** Commands including options must be shorter than this. */
67 #define MAX_COMMAND_LEN 32768
70 extern struct misc_meta_data *mmd;
71 extern struct sender senders[];
72 int send_afs_status(struct command_context *cc, int parser_friendly);
74 static void dummy(__a_unused int s)
79 * Compute human readable vss status text.
81 * We can't call vss_playing() and friends here because those functions read
82 * the flags from the primary mmd structure, so calling them from command
83 * handler context would require to take the mmd lock. At the time the function
84 * is called we already took a copy of the mmd structure and want to use the
85 * flags value of the copy for computing the vss status text.
87 static char *vss_status_tohuman(unsigned int flags)
89 if (flags & VSS_PLAYING)
90 return para_strdup("playing");
92 return para_strdup("stopped");
93 return para_strdup("paused");
97 * return human readable permission string. Never returns NULL.
99 static char *cmd_perms_itohuman(unsigned int perms)
101 char *msg = para_malloc(5 * sizeof(char));
103 msg[0] = perms & AFS_READ? 'a' : '-';
104 msg[1] = perms & AFS_WRITE? 'A' : '-';
105 msg[2] = perms & VSS_READ? 'v' : '-';
106 msg[3] = perms & VSS_WRITE? 'V' : '-';
112 * Never returns NULL.
114 static char *vss_get_status_flags(unsigned int flags)
116 char *msg = para_malloc(5 * sizeof(char));
118 msg[0] = (flags & VSS_PLAYING)? 'P' : '_';
119 msg[1] = (flags & VSS_NOMORE)? 'O' : '_';
120 msg[2] = (flags & VSS_NEXT)? 'N' : '_';
121 msg[3] = (flags & VSS_REPOS)? 'R' : '_';
126 static unsigned get_status(struct misc_meta_data *nmmd, int parser_friendly,
129 char *status, *flags; /* vss status info */
130 /* nobody updates our version of "now" */
131 long offset = (nmmd->offset + 500) / 1000;
132 struct timeval current_time;
133 struct para_buffer b = {.flags = parser_friendly? PBF_SIZE_PREFIX : 0};
135 /* report real status */
136 status = vss_status_tohuman(nmmd->vss_status_flags);
137 flags = vss_get_status_flags(nmmd->vss_status_flags);
138 clock_get_realtime(¤t_time);
140 * The calls to WRITE_STATUS_ITEM() below never fail because
141 * b->max_size is zero (unlimited), see para_printf(). However, clang
142 * is not smart enough to prove this and complains nevertheless.
143 * Casting the return value to void silences clang.
145 (void)WRITE_STATUS_ITEM(&b, SI_STATUS, "%s\n", status);
146 (void)WRITE_STATUS_ITEM(&b, SI_STATUS_FLAGS, "%s\n", flags);
147 (void)WRITE_STATUS_ITEM(&b, SI_OFFSET, "%li\n", offset);
148 (void)WRITE_STATUS_ITEM(&b, SI_AFS_MODE, "%s\n", mmd->afs_mode_string);
149 (void)WRITE_STATUS_ITEM(&b, SI_STREAM_START, "%lu.%lu\n",
150 (long unsigned)nmmd->stream_start.tv_sec,
151 (long unsigned)nmmd->stream_start.tv_usec);
152 (void)WRITE_STATUS_ITEM(&b, SI_CURRENT_TIME, "%lu.%lu\n",
153 (long unsigned)current_time.tv_sec,
154 (long unsigned)current_time.tv_usec);
161 static int check_sender_args(int argc, char * const * argv, struct sender_command_data *scd)
165 const char *subcmds[] = {SENDER_SUBCOMMANDS NULL};
166 scd->sender_num = -1;
168 return -E_COMMAND_SYNTAX;
169 for (i = 0; senders[i].name; i++)
170 if (!strcmp(senders[i].name, argv[1]))
172 PARA_DEBUG_LOG("%d:%s\n", argc, argv[1]);
173 if (!senders[i].name)
174 return -E_COMMAND_SYNTAX;
176 for (i = 0; subcmds[i]; i++)
177 if (!strcmp(subcmds[i], argv[2]))
180 return -E_COMMAND_SYNTAX;
182 if (!senders[scd->sender_num].client_cmds[scd->cmd_num])
183 return -E_SENDER_CMD;
184 switch (scd->cmd_num) {
188 return -E_COMMAND_SYNTAX;
192 if (argc != 4 || parse_cidr(argv[3], scd->host,
193 sizeof(scd->host), &scd->netmask) == NULL)
194 return -E_COMMAND_SYNTAX;
199 return -E_COMMAND_SYNTAX;
200 return parse_fec_url(argv[3], scd);
202 return -E_COMMAND_SYNTAX;
208 * Send a sideband packet through a blocking file descriptor.
210 * \param scc fd and crypto keys.
211 * \param buf The buffer to send.
212 * \param numbytes The size of \a buf.
213 * \param band The sideband designator of this packet.
214 * \param dont_free If true, never deallocate \a buf.
216 * The nonblock flag must be disabled for the file descriptor given by \a scc.
218 * Stream cipher encryption is automatically activated if necessary via the
219 * sideband transformation, depending on the value of \a band.
223 * \sa \ref send_sb_va().
225 int send_sb(struct stream_cipher_context *scc, void *buf, size_t numbytes,
226 int band, bool dont_free)
229 struct sb_context *sbc;
231 sb_transformation trafo = band < SBD_PROCEED? NULL : sc_trafo;
232 struct sb_buffer sbb = SBB_INIT(band, buf, numbytes);
234 sbc = sb_new_send(&sbb, dont_free, trafo, scc->send);
236 ret = sb_get_send_buffers(sbc, iov);
237 ret = xwritev(scc->fd, iov, ret);
240 } while (sb_sent(sbc, ret) == false);
248 * Create a variable sized buffer and send it as a sideband packet.
250 * \param scc Passed to \ref send_sb.
251 * \param band See \ref send_sb.
252 * \param fmt The format string.
254 * \return The return value of the underlying call to \ref send_sb.
256 __printf_3_4 int send_sb_va(struct stream_cipher_context *scc, int band,
257 const char *fmt, ...)
264 ret = xvasprintf(&msg, fmt, ap);
266 return send_sb(scc, msg, ret, band, false);
270 * Send an error message to a client.
272 * \param cc Client info.
273 * \param err The (positive) error code.
275 * \return The return value of the underlying call to send_sb_va().
277 int send_strerror(struct command_context *cc, int err)
279 return send_sb_va(&cc->scc, SBD_ERROR_LOG, "%s\n", para_strerror(err));
283 * Send a sideband packet through a blocking file descriptor.
285 * \param scc fd and crypto keys.
286 * \param expected_band The expected band designator.
287 * \param max_size Passed to \ref sb_new_recv().
288 * \param result Body of the sideband packet is returned here.
290 * If \a expected_band is not \p SBD_ANY, the band designator of the received
291 * sideband packet is compared to \a expected_band and a mismatch is considered
296 int recv_sb(struct stream_cipher_context *scc,
297 enum sb_designator expected_band,
298 size_t max_size, struct iovec *result)
301 struct sb_context *sbc;
303 struct sb_buffer sbb;
304 sb_transformation trafo;
306 trafo = expected_band != SBD_ANY && expected_band < SBD_PROCEED?
308 sbc = sb_new_recv(max_size, trafo, scc->recv);
310 sb_get_recv_buffer(sbc, &iov);
311 ret = recv_bin_buffer(scc->fd, iov.iov_base, iov.iov_len);
316 ret = sb_received(sbc, ret, &sbb);
323 if (expected_band != SBD_ANY && sbb.band != expected_band)
332 static int com_sender(struct command_context *cc)
336 struct sender_command_data scd;
339 for (i = 0; senders[i].name; i++) {
341 ret = xasprintf(&tmp, "%s%s\n", msg? msg : "",
346 return send_sb(&cc->scc, msg, ret, SBD_OUTPUT, false);
348 ret = check_sender_args(cc->argc, cc->argv, &scd);
350 if (scd.sender_num < 0)
352 if (strcmp(cc->argv[2], "status") == 0)
353 msg = senders[scd.sender_num].status();
355 msg = senders[scd.sender_num].help();
356 return send_sb(&cc->scc, msg, strlen(msg), SBD_OUTPUT, false);
359 switch (scd.cmd_num) {
362 assert(senders[scd.sender_num].resolve_target);
363 ret = senders[scd.sender_num].resolve_target(cc->argv[3], &scd);
368 for (i = 0; i < 10; i++) {
369 mutex_lock(mmd_mutex);
370 if (mmd->sender_cmd_data.cmd_num >= 0) {
371 /* another sender command is active, retry in 100ms */
372 struct timespec ts = {.tv_nsec = 100 * 1000 * 1000};
373 mutex_unlock(mmd_mutex);
374 nanosleep(&ts, NULL);
377 mmd->sender_cmd_data = scd;
378 mutex_unlock(mmd_mutex);
381 return (i < 10)? 1 : -E_LOCK;
385 static int com_si(struct command_context *cc)
391 return -E_COMMAND_SYNTAX;
392 mutex_lock(mmd_mutex);
393 ut = daemon_get_uptime_str(now);
394 ret = xasprintf(&msg,
395 "up: %s\nplayed: %u\n"
398 "connections (active/accepted/total): %u/%u/%u\n"
399 "current loglevel: %s\n"
400 "supported audio formats: %s\n",
404 mmd->active_connections,
408 AUDIO_FORMAT_HANDLERS
410 mutex_unlock(mmd_mutex);
412 return send_sb(&cc->scc, msg, ret, SBD_OUTPUT, false);
416 static int com_version(struct command_context *cc)
421 if (cc->argc > 1 && strcmp(cc->argv[1], "-v") == 0)
422 len = xasprintf(&msg, "%s", version_text("server"));
424 len = xasprintf(&msg, "%s\n", version_single_line("server"));
425 return send_sb(&cc->scc, msg, len, SBD_OUTPUT, false);
428 /** These status items are cleared if no audio file is currently open. */
429 #define EMPTY_STATUS_ITEMS \
434 ITEM(ATTRIBUTES_BITMAP) \
435 ITEM(ATTRIBUTES_TXT) \
446 ITEM(SECONDS_TOTAL) \
459 ITEM(AMPLIFICATION) \
462 * Write a list of audio-file related status items with empty values.
464 * This is used by vss when currently no audio file is open.
466 static unsigned empty_status_items(int parser_friendly, char **result)
472 len = xasprintf(&esi,
473 #define ITEM(x) "0004 %02x:\n"
476 #define ITEM(x) , (unsigned) SI_ ## x
481 len = xasprintf(&esi,
482 #define ITEM(x) "%s:\n"
485 #define ITEM(x) ,status_item_list[SI_ ## x]
492 #undef EMPTY_STATUS_ITEMS
495 static int com_stat(struct command_context *cc)
498 struct misc_meta_data tmp, *nmmd = &tmp;
501 int parser_friendly = 0;
503 para_sigaction(SIGUSR1, dummy);
505 for (i = 1; i < cc->argc; i++) {
506 const char *arg = cc->argv[i];
509 if (!strcmp(arg, "--")) {
513 if (!strncmp(arg, "-n=", 3)) {
514 ret = para_atoi32(arg + 3, &num);
519 if (!strcmp(arg, "-p")) {
523 return -E_COMMAND_SYNTAX;
526 return -E_COMMAND_SYNTAX;
529 * Copy the mmd structure to minimize the time we hold the mmd
532 mutex_lock(mmd_mutex);
534 mutex_unlock(mmd_mutex);
535 ret = get_status(nmmd, parser_friendly, &s);
536 ret = send_sb(&cc->scc, s, ret, SBD_OUTPUT, false);
539 if (nmmd->vss_status_flags & VSS_NEXT) {
541 ret = empty_status_items(parser_friendly, &esi);
542 ret = send_sb(&cc->scc, esi, ret, SBD_OUTPUT, false);
546 send_afs_status(cc, parser_friendly);
548 if (num > 0 && !--num)
551 ret = -E_SERVER_CRASH;
559 static int send_list_of_commands(struct command_context *cc, struct server_command *cmd,
564 for (; cmd->name; cmd++) {
565 char *tmp, *perms = cmd_perms_itohuman(cmd->perms);
566 tmp = make_message("%s\t%s\t%s\t%s\n", cmd->name, handler,
567 perms, cmd->description);
569 msg = para_strcat(msg, tmp);
573 return send_sb(&cc->scc, msg, strlen(msg), SBD_OUTPUT, false);
576 /* returns string that must be freed by the caller */
577 static struct server_command *get_cmd_ptr(const char *name, char **handler)
579 struct server_command *cmd;
581 for (cmd = server_cmds; cmd->name; cmd++)
582 if (!strcmp(cmd->name, name)) {
584 *handler = para_strdup("server"); /* server commands */
587 /* not found, look for commands supported by afs */
588 for (cmd = afs_cmds; cmd->name; cmd++)
589 if (!strcmp(cmd->name, name)) {
591 *handler = para_strdup("afs");
598 static int com_help(struct command_context *cc)
600 struct server_command *cmd;
601 char *perms, *handler, *buf;
605 /* no argument given, print list of commands */
606 if ((ret = send_list_of_commands(cc, server_cmds, "server")) < 0)
608 return send_list_of_commands(cc, afs_cmds, "afs");
610 /* argument given for help */
611 cmd = get_cmd_ptr(cc->argv[1], &handler);
614 perms = cmd_perms_itohuman(cmd->perms);
615 ret = xasprintf(&buf, "%s - %s\n\n"
629 return send_sb(&cc->scc, buf, ret, SBD_OUTPUT, false);
633 static int com_hup(struct command_context *cc)
636 return -E_COMMAND_SYNTAX;
637 kill(getppid(), SIGHUP);
642 static int com_term(struct command_context *cc)
645 return -E_COMMAND_SYNTAX;
646 kill(getppid(), SIGTERM);
650 static int com_play(struct command_context *cc)
653 return -E_COMMAND_SYNTAX;
654 mutex_lock(mmd_mutex);
655 mmd->new_vss_status_flags |= VSS_PLAYING;
656 mmd->new_vss_status_flags &= ~VSS_NOMORE;
657 mutex_unlock(mmd_mutex);
662 static int com_stop(struct command_context *cc)
665 return -E_COMMAND_SYNTAX;
666 mutex_lock(mmd_mutex);
667 mmd->new_vss_status_flags &= ~VSS_PLAYING;
668 mmd->new_vss_status_flags &= ~VSS_REPOS;
669 mmd->new_vss_status_flags |= VSS_NEXT;
670 mutex_unlock(mmd_mutex);
675 static int com_pause(struct command_context *cc)
678 return -E_COMMAND_SYNTAX;
679 mutex_lock(mmd_mutex);
680 if (!vss_paused() && !vss_stopped()) {
682 mmd->new_vss_status_flags &= ~VSS_PLAYING;
683 mmd->new_vss_status_flags &= ~VSS_NEXT;
685 mutex_unlock(mmd_mutex);
690 static int com_next(struct command_context *cc)
693 return -E_COMMAND_SYNTAX;
694 mutex_lock(mmd_mutex);
696 mmd->new_vss_status_flags |= VSS_NEXT;
697 mutex_unlock(mmd_mutex);
702 static int com_nomore(struct command_context *cc)
705 return -E_COMMAND_SYNTAX;
706 mutex_lock(mmd_mutex);
707 if (vss_playing() || vss_paused())
708 mmd->new_vss_status_flags |= VSS_NOMORE;
709 mutex_unlock(mmd_mutex);
714 static int com_ff(struct command_context *cc)
717 int ret, backwards = 0;
722 return -E_COMMAND_SYNTAX;
723 if (!(ret = sscanf(cc->argv[1], "%u%c", &i, &c)))
724 return -E_COMMAND_SYNTAX;
725 if (ret > 1 && c == '-')
726 backwards = 1; /* jmp backwards */
727 mutex_lock(mmd_mutex);
728 ret = -E_NO_AUDIO_FILE;
729 if (!mmd->afd.afhi.chunks_total || !mmd->afd.afhi.seconds_total)
731 promille = (1000 * mmd->current_chunk) / mmd->afd.afhi.chunks_total;
733 promille -= 1000 * i / mmd->afd.afhi.seconds_total;
735 promille += 1000 * i / mmd->afd.afhi.seconds_total;
738 if (promille > 1000) {
739 mmd->new_vss_status_flags |= VSS_NEXT;
742 mmd->repos_request = (mmd->afd.afhi.chunks_total * promille) / 1000;
743 mmd->new_vss_status_flags |= VSS_REPOS;
744 mmd->new_vss_status_flags &= ~VSS_NEXT;
748 mutex_unlock(mmd_mutex);
753 static int com_jmp(struct command_context *cc)
759 return -E_COMMAND_SYNTAX;
760 if (sscanf(cc->argv[1], "%lu", &i) <= 0)
761 return -E_COMMAND_SYNTAX;
762 mutex_lock(mmd_mutex);
763 ret = -E_NO_AUDIO_FILE;
764 if (!mmd->afd.afhi.chunks_total)
768 PARA_INFO_LOG("jumping to %lu%%\n", i);
769 mmd->repos_request = (mmd->afd.afhi.chunks_total * i + 50) / 100;
770 PARA_INFO_LOG("sent: %lu, offset before jmp: %li\n",
771 mmd->chunks_sent, mmd->offset);
772 mmd->new_vss_status_flags |= VSS_REPOS;
773 mmd->new_vss_status_flags &= ~VSS_NEXT;
777 mutex_unlock(mmd_mutex);
781 static int com_tasks(struct command_context *cc)
783 char *tl = server_get_tasks();
787 ret = send_sb(&cc->scc, tl, strlen(tl), SBD_OUTPUT, false);
792 * check if perms are sufficient to exec a command having perms cmd_perms.
793 * Returns 0 if perms are sufficient, -E_PERM otherwise.
795 static int check_perms(unsigned int perms, const struct server_command *cmd_ptr)
797 PARA_DEBUG_LOG("checking permissions\n");
798 return (cmd_ptr->perms & perms) < cmd_ptr->perms ? -E_PERM : 0;
801 static void reset_signals(void)
803 para_sigaction(SIGCHLD, SIG_IGN);
804 para_sigaction(SIGINT, SIG_DFL);
805 para_sigaction(SIGTERM, SIG_DFL);
806 para_sigaction(SIGHUP, SIG_DFL);
809 struct connection_features {
810 bool aes_ctr128_requested;
813 static int parse_auth_request(char *buf, int len, struct user **u,
814 struct connection_features *cf)
817 char *p, *username, **features = NULL;
818 size_t auth_rq_len = strlen(AUTH_REQUEST_MSG);
821 memset(cf, 0, sizeof(*cf));
822 if (len < auth_rq_len + 2)
823 return -E_AUTH_REQUEST;
824 if (strncmp(buf, AUTH_REQUEST_MSG, auth_rq_len) != 0)
825 return -E_AUTH_REQUEST;
826 username = buf + auth_rq_len;
827 p = strchr(username, ' ');
831 return -E_AUTH_REQUEST;
834 create_argv(p, ",", &features);
835 for (i = 0; features[i]; i++) {
836 if (strcmp(features[i], "sideband") == 0)
838 if (strcmp(features[i], "aes_ctr128") == 0)
839 cf->aes_ctr128_requested = true;
841 ret = -E_BAD_FEATURE;
846 PARA_DEBUG_LOG("received auth request for user %s\n", username);
847 *u = lookup_user(username);
854 #define HANDSHAKE_BUFSIZE 4096
856 static int run_command(struct command_context *cc, struct iovec *iov,
857 const char *peername)
861 struct server_command *cmd;
863 if (iov->iov_base == NULL || iov->iov_len == 0)
866 p[iov->iov_len - 1] = '\0'; /* just to be sure */
867 cmd = get_cmd_ptr(p, NULL);
870 ret = check_perms(cc->u->perms, cmd);
873 end = iov->iov_base + iov->iov_len;
874 for (i = 0; p < end; i++)
877 cc->argv = para_malloc((cc->argc + 1) * sizeof(char *));
878 for (i = 0, p = iov->iov_base; p < end; i++) {
879 cc->argv[i] = para_strdup(p);
882 cc->argv[cc->argc] = NULL;
883 PARA_NOTICE_LOG("calling com_%s() for %s@%s\n", cmd->name,
884 cc->u->name, peername);
885 ret = cmd->handler(cc);
887 mutex_lock(mmd_mutex);
889 if (ret >= 0 && (cmd->perms & AFS_WRITE))
891 mutex_unlock(mmd_mutex);
896 * Perform user authentication and execute a command.
898 * \param fd The file descriptor to send output to.
899 * \param peername Identifies the connecting peer.
901 * Whenever para_server accepts an incoming tcp connection on the port it
902 * listens on, it forks and the resulting child calls this function.
904 * An RSA-based challenge/response is used to authenticate the peer. It that
905 * authentication succeeds, a random session key is generated and sent back to
906 * the peer, encrypted with its RSA public key. From this point on, all
907 * transfers are crypted with this session key.
909 * Next it is checked if the peer supplied a valid server command or a command
910 * for the audio file selector. If yes, and if the user has sufficient
911 * permissions to execute that command, the function calls the corresponding
912 * command handler which does argument checking and further processing.
914 * In order to cope with a DOS attacks, a timeout is set up which terminates
915 * the function if the connection was not authenticated when the timeout
918 * \sa alarm(2), crypt.c, crypt.h
920 __noreturn void handle_connect(int fd, const char *peername)
923 unsigned char rand_buf[CHALLENGE_SIZE + 2 * SESSION_KEY_LEN];
924 unsigned char challenge_hash[HASH_SIZE];
925 char *command = NULL, *buf = para_malloc(HANDSHAKE_BUFSIZE) /* must be on the heap */;
927 struct command_context cc_struct = {.peer = peername}, *cc = &cc_struct;
929 struct connection_features cf;
933 /* we need a blocking fd here as recv() might return EAGAIN otherwise. */
934 ret = mark_fd_blocking(fd);
937 /* send Welcome message */
938 ret = write_va_buffer(fd, "This is para_server, version "
939 PACKAGE_VERSION ".\n"
940 "Features: sideband,aes_ctr128\n"
944 /* recv auth request line */
945 ret = recv_buffer(fd, buf, HANDSHAKE_BUFSIZE);
948 ret = parse_auth_request(buf, ret, &cc->u, &cf);
952 get_random_bytes_or_die(rand_buf, sizeof(rand_buf));
953 ret = pub_encrypt(cc->u->pubkey, rand_buf, sizeof(rand_buf),
954 (unsigned char *)buf);
960 * We don't want to reveal our user names, so we send a
961 * challenge to the client even if the user does not exist, and
962 * fail the authentication later.
965 get_random_bytes_or_die((unsigned char *)buf, numbytes);
967 PARA_DEBUG_LOG("sending %d byte challenge + session key (%zu bytes)\n",
968 CHALLENGE_SIZE, numbytes);
969 ret = send_sb(&cc->scc, buf, numbytes, SBD_CHALLENGE, false);
973 ret = recv_sb(&cc->scc, SBD_CHALLENGE_RESPONSE,
974 HANDSHAKE_BUFSIZE, &iov);
978 numbytes = iov.iov_len;
979 PARA_DEBUG_LOG("received %zu bytes challenge response\n", numbytes);
984 * The correct response is the hash of the first CHALLENGE_SIZE bytes
985 * of the random data.
988 if (numbytes != HASH_SIZE)
990 hash_function((char *)rand_buf, CHALLENGE_SIZE, challenge_hash);
991 if (memcmp(challenge_hash, buf, HASH_SIZE))
993 /* auth successful */
995 PARA_INFO_LOG("good auth for %s\n", cc->u->name);
996 /* init stream cipher keys with the second part of the random buffer */
997 cc->scc.recv = sc_new(rand_buf + CHALLENGE_SIZE, SESSION_KEY_LEN,
998 cf.aes_ctr128_requested);
999 cc->scc.send = sc_new(rand_buf + CHALLENGE_SIZE + SESSION_KEY_LEN,
1000 SESSION_KEY_LEN, cf.aes_ctr128_requested);
1001 ret = send_sb(&cc->scc, NULL, 0, SBD_PROCEED, false);
1004 ret = recv_sb(&cc->scc, SBD_COMMAND, MAX_COMMAND_LEN, &iov);
1007 ret = run_command(cc, &iov, peername);
1014 if (send_strerror(cc, -ret) >= 0)
1015 send_sb(&cc->scc, NULL, 0, SBD_EXIT__FAILURE, true);
1017 PARA_NOTICE_LOG("%s\n", para_strerror(-ret));
1021 mutex_lock(mmd_mutex);
1022 mmd->active_connections--;
1023 mutex_unlock(mmd_mutex);
1025 ret = send_sb(&cc->scc, NULL, 0, SBD_EXIT__SUCCESS, true);
1027 PARA_NOTICE_LOG("%s\n", para_strerror(-ret));
1029 sc_free(cc->scc.recv);
1030 sc_free(cc->scc.send);
1031 exit(ret < 0? EXIT_FAILURE : EXIT_SUCCESS);