2 * Copyright (c) 2012 The FreeBSD Foundation
5 * This software was developed by Edward Tomasz Napierala under sponsorship
6 * from the FreeBSD Foundation.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 #include <sys/cdefs.h>
32 __FBSDID("$FreeBSD$");
34 #include <sys/types.h>
36 #include <sys/ioctl.h>
37 #include <sys/param.h>
38 #include <sys/linker.h>
39 #include <sys/socket.h>
40 #include <sys/capsicum.h>
57 static volatile bool sigalrm_received = false;
59 static int nchildren = 0;
65 fprintf(stderr, "usage: iscsid [-P pidfile][-d][-m maxproc][-t timeout]\n");
70 checked_strdup(const char *s)
81 resolve_addr(const struct connection *conn, const char *address,
82 struct addrinfo **ai, bool initiator_side)
84 struct addrinfo hints;
85 char *arg, *addr, *ch;
87 int error, colons = 0;
89 arg = checked_strdup(address);
92 fail(conn, "empty address");
93 log_errx(1, "empty address");
97 * IPv6 address in square brackets, perhaps with port.
100 addr = strsep(&arg, "]");
102 fail(conn, "malformed address");
103 log_errx(1, "malformed address %s", address);
105 if (arg[0] == '\0') {
107 } else if (arg[0] == ':') {
110 fail(conn, "malformed address");
111 log_errx(1, "malformed address %s", address);
115 * Either IPv6 address without brackets - and without
116 * a port - or IPv4 address. Just count the colons.
118 for (ch = arg; *ch != '\0'; ch++) {
126 addr = strsep(&arg, ":");
134 if (port == NULL && !initiator_side)
137 memset(&hints, 0, sizeof(hints));
138 hints.ai_family = PF_UNSPEC;
139 hints.ai_socktype = SOCK_STREAM;
140 hints.ai_flags = AI_ADDRCONFIG | AI_NUMERICSERV;
142 hints.ai_flags |= AI_PASSIVE;
144 error = getaddrinfo(addr, port, &hints, ai);
146 fail(conn, gai_strerror(error));
147 log_errx(1, "getaddrinfo for %s failed: %s",
148 address, gai_strerror(error));
152 static struct connection *
153 connection_new(int iscsi_fd, const struct iscsi_daemon_request *request)
155 struct connection *conn;
156 struct iscsi_session_limits *isl;
157 struct addrinfo *from_ai, *to_ai;
158 const char *from_addr, *to_addr;
159 #ifdef ICL_KERNEL_PROXY
160 struct iscsi_daemon_connect idc;
164 conn = calloc(1, sizeof(*conn));
166 log_err(1, "calloc");
169 * Default values, from RFC 3720, section 12.
171 conn->conn_header_digest = CONN_DIGEST_NONE;
172 conn->conn_data_digest = CONN_DIGEST_NONE;
173 conn->conn_initial_r2t = true;
174 conn->conn_immediate_data = true;
175 conn->conn_max_recv_data_segment_length = 8192;
176 conn->conn_max_send_data_segment_length = 8192;
177 conn->conn_max_burst_length = 262144;
178 conn->conn_first_burst_length = 65536;
179 conn->conn_iscsi_fd = iscsi_fd;
181 conn->conn_session_id = request->idr_session_id;
182 memcpy(&conn->conn_conf, &request->idr_conf, sizeof(conn->conn_conf));
183 memcpy(&conn->conn_isid, &request->idr_isid, sizeof(conn->conn_isid));
184 conn->conn_tsih = request->idr_tsih;
187 * Read the driver limits and provide reasonable defaults for the ones
188 * the driver doesn't care about. If a max_snd_dsl is not explicitly
189 * provided by the driver then we'll make sure both conn->max_snd_dsl
190 * and isl->max_snd_dsl are set to the rcv_dsl. This preserves historic
193 isl = &conn->conn_limits;
194 memcpy(isl, &request->idr_limits, sizeof(*isl));
195 if (isl->isl_max_recv_data_segment_length == 0)
196 isl->isl_max_recv_data_segment_length = (1 << 24) - 1;
197 if (isl->isl_max_send_data_segment_length == 0)
198 isl->isl_max_send_data_segment_length =
199 isl->isl_max_recv_data_segment_length;
200 if (isl->isl_max_burst_length == 0)
201 isl->isl_max_burst_length = (1 << 24) - 1;
202 if (isl->isl_first_burst_length == 0)
203 isl->isl_first_burst_length = (1 << 24) - 1;
204 if (isl->isl_first_burst_length > isl->isl_max_burst_length)
205 isl->isl_first_burst_length = isl->isl_max_burst_length;
208 * Limit default send length in case it won't be negotiated.
209 * We can't do it for other limits, since they may affect both
210 * sender and receiver operation, and we must obey defaults.
212 if (conn->conn_max_send_data_segment_length >
213 isl->isl_max_send_data_segment_length) {
214 conn->conn_max_send_data_segment_length =
215 isl->isl_max_send_data_segment_length;
218 from_addr = conn->conn_conf.isc_initiator_addr;
219 to_addr = conn->conn_conf.isc_target_addr;
221 if (from_addr[0] != '\0')
222 resolve_addr(conn, from_addr, &from_ai, true);
226 resolve_addr(conn, to_addr, &to_ai, false);
228 #ifdef ICL_KERNEL_PROXY
229 if (conn->conn_conf.isc_iser) {
230 memset(&idc, 0, sizeof(idc));
231 idc.idc_session_id = conn->conn_session_id;
232 if (conn->conn_conf.isc_iser)
234 idc.idc_domain = to_ai->ai_family;
235 idc.idc_socktype = to_ai->ai_socktype;
236 idc.idc_protocol = to_ai->ai_protocol;
237 if (from_ai != NULL) {
238 idc.idc_from_addr = from_ai->ai_addr;
239 idc.idc_from_addrlen = from_ai->ai_addrlen;
241 idc.idc_to_addr = to_ai->ai_addr;
242 idc.idc_to_addrlen = to_ai->ai_addrlen;
244 log_debugx("connecting to %s using ICL kernel proxy", to_addr);
245 error = ioctl(iscsi_fd, ISCSIDCONNECT, &idc);
247 fail(conn, strerror(errno));
248 log_err(1, "failed to connect to %s "
249 "using ICL kernel proxy: ISCSIDCONNECT", to_addr);
254 #endif /* ICL_KERNEL_PROXY */
256 if (conn->conn_conf.isc_iser) {
257 fail(conn, "iSER not supported");
258 log_errx(1, "iscsid(8) compiled without ICL_KERNEL_PROXY "
259 "does not support iSER");
262 conn->conn_socket = socket(to_ai->ai_family, to_ai->ai_socktype,
264 if (conn->conn_socket < 0) {
265 fail(conn, strerror(errno));
266 log_err(1, "failed to create socket for %s", from_addr);
268 sockbuf = SOCKBUF_SIZE;
269 if (setsockopt(conn->conn_socket, SOL_SOCKET, SO_RCVBUF,
270 &sockbuf, sizeof(sockbuf)) == -1)
271 log_warn("setsockopt(SO_RCVBUF) failed");
272 sockbuf = SOCKBUF_SIZE;
273 if (setsockopt(conn->conn_socket, SOL_SOCKET, SO_SNDBUF,
274 &sockbuf, sizeof(sockbuf)) == -1)
275 log_warn("setsockopt(SO_SNDBUF) failed");
276 if (from_ai != NULL) {
277 error = bind(conn->conn_socket, from_ai->ai_addr,
278 from_ai->ai_addrlen);
280 fail(conn, strerror(errno));
281 log_err(1, "failed to bind to %s", from_addr);
284 log_debugx("connecting to %s", to_addr);
285 error = connect(conn->conn_socket, to_ai->ai_addr, to_ai->ai_addrlen);
287 fail(conn, strerror(errno));
288 log_err(1, "failed to connect to %s", to_addr);
295 handoff(struct connection *conn)
297 struct iscsi_daemon_handoff idh;
300 log_debugx("handing off connection to the kernel");
302 memset(&idh, 0, sizeof(idh));
303 idh.idh_session_id = conn->conn_session_id;
304 idh.idh_socket = conn->conn_socket;
305 strlcpy(idh.idh_target_alias, conn->conn_target_alias,
306 sizeof(idh.idh_target_alias));
307 idh.idh_tsih = conn->conn_tsih;
308 idh.idh_statsn = conn->conn_statsn;
309 idh.idh_header_digest = conn->conn_header_digest;
310 idh.idh_data_digest = conn->conn_data_digest;
311 idh.idh_initial_r2t = conn->conn_initial_r2t;
312 idh.idh_immediate_data = conn->conn_immediate_data;
313 idh.idh_max_recv_data_segment_length =
314 conn->conn_max_recv_data_segment_length;
315 idh.idh_max_send_data_segment_length =
316 conn->conn_max_send_data_segment_length;
317 idh.idh_max_burst_length = conn->conn_max_burst_length;
318 idh.idh_first_burst_length = conn->conn_first_burst_length;
320 error = ioctl(conn->conn_iscsi_fd, ISCSIDHANDOFF, &idh);
322 log_err(1, "ISCSIDHANDOFF");
326 fail(const struct connection *conn, const char *reason)
328 struct iscsi_daemon_fail idf;
329 int error, saved_errno;
333 memset(&idf, 0, sizeof(idf));
334 idf.idf_session_id = conn->conn_session_id;
335 strlcpy(idf.idf_reason, reason, sizeof(idf.idf_reason));
337 error = ioctl(conn->conn_iscsi_fd, ISCSIDFAIL, &idf);
339 log_err(1, "ISCSIDFAIL");
345 * XXX: I CANT INTO LATIN
348 capsicate(struct connection *conn)
352 #ifdef ICL_KERNEL_PROXY
353 const unsigned long cmds[] = { ISCSIDCONNECT, ISCSIDSEND, ISCSIDRECEIVE,
354 ISCSIDHANDOFF, ISCSIDFAIL, ISCSISADD, ISCSISREMOVE, ISCSISMODIFY };
356 const unsigned long cmds[] = { ISCSIDHANDOFF, ISCSIDFAIL, ISCSISADD,
357 ISCSISREMOVE, ISCSISMODIFY };
360 cap_rights_init(&rights, CAP_IOCTL);
361 error = cap_rights_limit(conn->conn_iscsi_fd, &rights);
362 if (error != 0 && errno != ENOSYS)
363 log_err(1, "cap_rights_limit");
365 error = cap_ioctls_limit(conn->conn_iscsi_fd, cmds, nitems(cmds));
367 if (error != 0 && errno != ENOSYS)
368 log_err(1, "cap_ioctls_limit");
371 if (error != 0 && errno != ENOSYS)
372 log_err(1, "cap_enter");
375 log_debugx("Capsicum capability mode enabled");
377 log_warnx("Capsicum capability mode not supported");
384 return (sigalrm_received);
388 sigalrm_handler(int dummy __unused)
391 * It would be easiest to just log an error and exit. We can't
392 * do this, though, because log_errx() is not signal safe, since
393 * it calls syslog(3). Instead, set a flag checked by pdu_send()
394 * and pdu_receive(), to call log_errx() there. Should they fail
395 * to notice, we'll exit here one second later.
397 if (sigalrm_received) {
399 * Oh well. Just give up and quit.
404 sigalrm_received = true;
408 set_timeout(int timeout)
411 struct itimerval itv;
415 log_debugx("session timeout disabled");
419 bzero(&sa, sizeof(sa));
420 sa.sa_handler = sigalrm_handler;
421 sigfillset(&sa.sa_mask);
422 error = sigaction(SIGALRM, &sa, NULL);
424 log_err(1, "sigaction");
427 * First SIGALRM will arive after conf_timeout seconds.
428 * If we do nothing, another one will arrive a second later.
430 bzero(&itv, sizeof(itv));
431 itv.it_interval.tv_sec = 1;
432 itv.it_value.tv_sec = timeout;
434 log_debugx("setting session timeout to %d seconds",
436 error = setitimer(ITIMER_REAL, &itv, NULL);
438 log_err(1, "setitimer");
442 sigchld_handler(int dummy __unused)
446 * The only purpose of this handler is to make SIGCHLD
447 * interrupt the ISCSIDWAIT ioctl(2), so we can call
448 * wait_for_children().
453 register_sigchld(void)
458 bzero(&sa, sizeof(sa));
459 sa.sa_handler = sigchld_handler;
460 sigfillset(&sa.sa_mask);
461 error = sigaction(SIGCHLD, &sa, NULL);
463 log_err(1, "sigaction");
468 handle_request(int iscsi_fd, const struct iscsi_daemon_request *request, int timeout)
470 struct connection *conn;
472 log_set_peer_addr(request->idr_conf.isc_target_addr);
473 if (request->idr_conf.isc_target[0] != '\0') {
474 log_set_peer_name(request->idr_conf.isc_target);
475 setproctitle("%s (%s)", request->idr_conf.isc_target_addr, request->idr_conf.isc_target);
477 setproctitle("%s", request->idr_conf.isc_target_addr);
480 conn = connection_new(iscsi_fd, request);
481 set_timeout(timeout);
484 if (conn->conn_conf.isc_discovery != 0)
489 log_debugx("nothing more to do; exiting");
494 wait_for_children(bool block)
502 * If "block" is true, wait for at least one process.
504 if (block && num == 0)
505 pid = wait4(-1, &status, 0, NULL);
507 pid = wait4(-1, &status, WNOHANG, NULL);
510 if (WIFSIGNALED(status)) {
511 log_warnx("child process %d terminated with signal %d",
512 pid, WTERMSIG(status));
513 } else if (WEXITSTATUS(status) != 0) {
514 log_warnx("child process %d terminated with exit status %d",
515 pid, WEXITSTATUS(status));
517 log_debugx("child process %d terminated gracefully", pid);
526 main(int argc, char **argv)
528 int ch, debug = 0, error, iscsi_fd, maxproc = 30, retval, saved_errno,
530 bool dont_daemonize = false;
533 const char *pidfile_path = DEFAULT_PIDFILE;
534 struct iscsi_daemon_request request;
536 while ((ch = getopt(argc, argv, "P:dl:m:t:")) != -1) {
539 pidfile_path = optarg;
542 dont_daemonize = true;
546 debug = atoi(optarg);
549 maxproc = atoi(optarg);
552 timeout = atoi(optarg);
565 pidfh = pidfile_open(pidfile_path, 0600, &otherpid);
568 log_errx(1, "daemon already running, pid: %jd.",
570 log_err(1, "cannot open or create pidfile \"%s\"",
574 iscsi_fd = open(ISCSI_PATH, O_RDWR);
575 if (iscsi_fd < 0 && errno == ENOENT) {
577 retval = kldload("iscsi");
579 iscsi_fd = open(ISCSI_PATH, O_RDWR);
584 log_err(1, "failed to open %s", ISCSI_PATH);
586 if (dont_daemonize == false) {
587 if (daemon(0, 0) == -1) {
588 log_warn("cannot daemonize");
589 pidfile_remove(pidfh);
594 pidfile_write(pidfh);
599 log_debugx("waiting for request from the kernel");
601 memset(&request, 0, sizeof(request));
602 error = ioctl(iscsi_fd, ISCSIDWAIT, &request);
604 if (errno == EINTR) {
605 nchildren -= wait_for_children(false);
606 assert(nchildren >= 0);
610 log_err(1, "ISCSIDWAIT");
613 if (dont_daemonize) {
614 log_debugx("not forking due to -d flag; "
615 "will exit after servicing a single request");
617 nchildren -= wait_for_children(false);
618 assert(nchildren >= 0);
620 while (maxproc > 0 && nchildren >= maxproc) {
621 log_debugx("maxproc limit of %d child processes hit; "
622 "waiting for child process to exit", maxproc);
623 nchildren -= wait_for_children(true);
624 assert(nchildren >= 0);
626 log_debugx("incoming connection; forking child process #%d",
637 pidfile_close(pidfh);
638 handle_request(iscsi_fd, &request, timeout);