2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2012 The FreeBSD Foundation
7 * This software was developed by Edward Tomasz Napierala under sponsorship
8 * from the FreeBSD Foundation.
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 #include <sys/cdefs.h>
34 __FBSDID("$FreeBSD$");
36 #include <sys/types.h>
38 #include <sys/ioctl.h>
39 #include <sys/param.h>
40 #include <sys/linker.h>
41 #include <sys/socket.h>
42 #include <sys/capsicum.h>
44 #include <netinet/in.h>
60 static volatile bool sigalrm_received = false;
62 static int nchildren = 0;
68 fprintf(stderr, "usage: iscsid [-P pidfile][-d][-m maxproc][-t timeout]\n");
73 checked_strdup(const char *s)
84 resolve_addr(const struct connection *conn, const char *address,
85 struct addrinfo **ai, bool initiator_side)
87 struct addrinfo hints;
88 char *arg, *addr, *ch;
90 int error, colons = 0;
92 arg = checked_strdup(address);
95 fail(conn, "empty address");
96 log_errx(1, "empty address");
100 * IPv6 address in square brackets, perhaps with port.
103 addr = strsep(&arg, "]");
105 fail(conn, "malformed address");
106 log_errx(1, "malformed address %s", address);
108 if (arg[0] == '\0') {
110 } else if (arg[0] == ':') {
113 fail(conn, "malformed address");
114 log_errx(1, "malformed address %s", address);
118 * Either IPv6 address without brackets - and without
119 * a port - or IPv4 address. Just count the colons.
121 for (ch = arg; *ch != '\0'; ch++) {
129 addr = strsep(&arg, ":");
137 if (port == NULL && !initiator_side)
140 memset(&hints, 0, sizeof(hints));
141 hints.ai_family = PF_UNSPEC;
142 hints.ai_socktype = SOCK_STREAM;
143 hints.ai_flags = AI_ADDRCONFIG | AI_NUMERICSERV;
145 hints.ai_flags |= AI_PASSIVE;
147 error = getaddrinfo(addr, port, &hints, ai);
149 fail(conn, gai_strerror(error));
150 log_errx(1, "getaddrinfo for %s failed: %s",
151 address, gai_strerror(error));
155 static struct connection *
156 connection_new(int iscsi_fd, const struct iscsi_daemon_request *request)
158 struct connection *conn;
159 struct iscsi_session_limits *isl;
160 struct addrinfo *from_ai, *to_ai;
161 const char *from_addr, *to_addr;
162 #ifdef ICL_KERNEL_PROXY
163 struct iscsi_daemon_connect idc;
167 conn = calloc(1, sizeof(*conn));
169 log_err(1, "calloc");
172 * Default values, from RFC 3720, section 12.
174 conn->conn_header_digest = CONN_DIGEST_NONE;
175 conn->conn_data_digest = CONN_DIGEST_NONE;
176 conn->conn_initial_r2t = true;
177 conn->conn_immediate_data = true;
178 conn->conn_max_recv_data_segment_length = 8192;
179 conn->conn_max_send_data_segment_length = 8192;
180 conn->conn_max_burst_length = 262144;
181 conn->conn_first_burst_length = 65536;
182 conn->conn_iscsi_fd = iscsi_fd;
184 conn->conn_session_id = request->idr_session_id;
185 memcpy(&conn->conn_conf, &request->idr_conf, sizeof(conn->conn_conf));
186 memcpy(&conn->conn_isid, &request->idr_isid, sizeof(conn->conn_isid));
187 conn->conn_tsih = request->idr_tsih;
190 * Read the driver limits and provide reasonable defaults for the ones
191 * the driver doesn't care about. If a max_snd_dsl is not explicitly
192 * provided by the driver then we'll make sure both conn->max_snd_dsl
193 * and isl->max_snd_dsl are set to the rcv_dsl. This preserves historic
196 isl = &conn->conn_limits;
197 memcpy(isl, &request->idr_limits, sizeof(*isl));
198 if (isl->isl_max_recv_data_segment_length == 0)
199 isl->isl_max_recv_data_segment_length = (1 << 24) - 1;
200 if (isl->isl_max_send_data_segment_length == 0)
201 isl->isl_max_send_data_segment_length =
202 isl->isl_max_recv_data_segment_length;
203 if (isl->isl_max_burst_length == 0)
204 isl->isl_max_burst_length = (1 << 24) - 1;
205 if (isl->isl_first_burst_length == 0)
206 isl->isl_first_burst_length = (1 << 24) - 1;
207 if (isl->isl_first_burst_length > isl->isl_max_burst_length)
208 isl->isl_first_burst_length = isl->isl_max_burst_length;
211 * Limit default send length in case it won't be negotiated.
212 * We can't do it for other limits, since they may affect both
213 * sender and receiver operation, and we must obey defaults.
215 if (conn->conn_max_send_data_segment_length >
216 isl->isl_max_send_data_segment_length) {
217 conn->conn_max_send_data_segment_length =
218 isl->isl_max_send_data_segment_length;
221 from_addr = conn->conn_conf.isc_initiator_addr;
222 to_addr = conn->conn_conf.isc_target_addr;
224 if (from_addr[0] != '\0')
225 resolve_addr(conn, from_addr, &from_ai, true);
229 resolve_addr(conn, to_addr, &to_ai, false);
231 #ifdef ICL_KERNEL_PROXY
232 if (conn->conn_conf.isc_iser) {
233 memset(&idc, 0, sizeof(idc));
234 idc.idc_session_id = conn->conn_session_id;
235 if (conn->conn_conf.isc_iser)
237 idc.idc_domain = to_ai->ai_family;
238 idc.idc_socktype = to_ai->ai_socktype;
239 idc.idc_protocol = to_ai->ai_protocol;
240 if (from_ai != NULL) {
241 idc.idc_from_addr = from_ai->ai_addr;
242 idc.idc_from_addrlen = from_ai->ai_addrlen;
244 idc.idc_to_addr = to_ai->ai_addr;
245 idc.idc_to_addrlen = to_ai->ai_addrlen;
247 log_debugx("connecting to %s using ICL kernel proxy", to_addr);
248 error = ioctl(iscsi_fd, ISCSIDCONNECT, &idc);
250 fail(conn, strerror(errno));
251 log_err(1, "failed to connect to %s "
252 "using ICL kernel proxy: ISCSIDCONNECT", to_addr);
257 #endif /* ICL_KERNEL_PROXY */
259 if (conn->conn_conf.isc_iser) {
260 fail(conn, "iSER not supported");
261 log_errx(1, "iscsid(8) compiled without ICL_KERNEL_PROXY "
262 "does not support iSER");
265 conn->conn_socket = socket(to_ai->ai_family, to_ai->ai_socktype,
267 if (conn->conn_socket < 0) {
268 fail(conn, strerror(errno));
269 log_err(1, "failed to create socket for %s", from_addr);
271 sockbuf = SOCKBUF_SIZE;
272 if (setsockopt(conn->conn_socket, SOL_SOCKET, SO_RCVBUF,
273 &sockbuf, sizeof(sockbuf)) == -1)
274 log_warn("setsockopt(SO_RCVBUF) failed");
275 sockbuf = SOCKBUF_SIZE;
276 if (setsockopt(conn->conn_socket, SOL_SOCKET, SO_SNDBUF,
277 &sockbuf, sizeof(sockbuf)) == -1)
278 log_warn("setsockopt(SO_SNDBUF) failed");
279 if (conn->conn_conf.isc_dscp != -1) {
280 int tos = conn->conn_conf.isc_dscp << 2;
281 if (to_ai->ai_family == AF_INET) {
282 if (setsockopt(conn->conn_socket,
284 &tos, sizeof(tos)) == -1)
285 log_warn("setsockopt(IP_TOS) "
289 if (to_ai->ai_family == AF_INET6) {
290 if (setsockopt(conn->conn_socket,
291 IPPROTO_IPV6, IPV6_TCLASS,
292 &tos, sizeof(tos)) == -1)
293 log_warn("setsockopt(IPV6_TCLASS) "
298 if (from_ai != NULL) {
299 error = bind(conn->conn_socket, from_ai->ai_addr,
300 from_ai->ai_addrlen);
302 fail(conn, strerror(errno));
303 log_err(1, "failed to bind to %s", from_addr);
306 log_debugx("connecting to %s", to_addr);
307 error = connect(conn->conn_socket, to_ai->ai_addr, to_ai->ai_addrlen);
309 fail(conn, strerror(errno));
310 log_err(1, "failed to connect to %s", to_addr);
317 handoff(struct connection *conn)
319 struct iscsi_daemon_handoff idh;
322 log_debugx("handing off connection to the kernel");
324 memset(&idh, 0, sizeof(idh));
325 idh.idh_session_id = conn->conn_session_id;
326 idh.idh_socket = conn->conn_socket;
327 strlcpy(idh.idh_target_alias, conn->conn_target_alias,
328 sizeof(idh.idh_target_alias));
329 idh.idh_tsih = conn->conn_tsih;
330 idh.idh_statsn = conn->conn_statsn;
331 idh.idh_header_digest = conn->conn_header_digest;
332 idh.idh_data_digest = conn->conn_data_digest;
333 idh.idh_initial_r2t = conn->conn_initial_r2t;
334 idh.idh_immediate_data = conn->conn_immediate_data;
335 idh.idh_max_recv_data_segment_length =
336 conn->conn_max_recv_data_segment_length;
337 idh.idh_max_send_data_segment_length =
338 conn->conn_max_send_data_segment_length;
339 idh.idh_max_burst_length = conn->conn_max_burst_length;
340 idh.idh_first_burst_length = conn->conn_first_burst_length;
342 error = ioctl(conn->conn_iscsi_fd, ISCSIDHANDOFF, &idh);
344 log_err(1, "ISCSIDHANDOFF");
348 fail(const struct connection *conn, const char *reason)
350 struct iscsi_daemon_fail idf;
351 int error, saved_errno;
355 memset(&idf, 0, sizeof(idf));
356 idf.idf_session_id = conn->conn_session_id;
357 strlcpy(idf.idf_reason, reason, sizeof(idf.idf_reason));
359 error = ioctl(conn->conn_iscsi_fd, ISCSIDFAIL, &idf);
361 log_err(1, "ISCSIDFAIL");
367 * XXX: I CANT INTO LATIN
370 capsicate(struct connection *conn)
374 #ifdef ICL_KERNEL_PROXY
375 const unsigned long cmds[] = { ISCSIDCONNECT, ISCSIDSEND, ISCSIDRECEIVE,
376 ISCSIDHANDOFF, ISCSIDFAIL, ISCSISADD, ISCSISREMOVE, ISCSISMODIFY };
378 const unsigned long cmds[] = { ISCSIDHANDOFF, ISCSIDFAIL, ISCSISADD,
379 ISCSISREMOVE, ISCSISMODIFY };
382 cap_rights_init(&rights, CAP_IOCTL);
383 error = cap_rights_limit(conn->conn_iscsi_fd, &rights);
384 if (error != 0 && errno != ENOSYS)
385 log_err(1, "cap_rights_limit");
387 error = cap_ioctls_limit(conn->conn_iscsi_fd, cmds, nitems(cmds));
389 if (error != 0 && errno != ENOSYS)
390 log_err(1, "cap_ioctls_limit");
393 if (error != 0 && errno != ENOSYS)
394 log_err(1, "cap_enter");
397 log_debugx("Capsicum capability mode enabled");
399 log_warnx("Capsicum capability mode not supported");
406 return (sigalrm_received);
410 sigalrm_handler(int dummy __unused)
413 * It would be easiest to just log an error and exit. We can't
414 * do this, though, because log_errx() is not signal safe, since
415 * it calls syslog(3). Instead, set a flag checked by pdu_send()
416 * and pdu_receive(), to call log_errx() there. Should they fail
417 * to notice, we'll exit here one second later.
419 if (sigalrm_received) {
421 * Oh well. Just give up and quit.
426 sigalrm_received = true;
430 set_timeout(int timeout)
433 struct itimerval itv;
437 log_debugx("session timeout disabled");
441 bzero(&sa, sizeof(sa));
442 sa.sa_handler = sigalrm_handler;
443 sigfillset(&sa.sa_mask);
444 error = sigaction(SIGALRM, &sa, NULL);
446 log_err(1, "sigaction");
449 * First SIGALRM will arive after conf_timeout seconds.
450 * If we do nothing, another one will arrive a second later.
452 bzero(&itv, sizeof(itv));
453 itv.it_interval.tv_sec = 1;
454 itv.it_value.tv_sec = timeout;
456 log_debugx("setting session timeout to %d seconds",
458 error = setitimer(ITIMER_REAL, &itv, NULL);
460 log_err(1, "setitimer");
464 sigchld_handler(int dummy __unused)
468 * The only purpose of this handler is to make SIGCHLD
469 * interrupt the ISCSIDWAIT ioctl(2), so we can call
470 * wait_for_children().
475 register_sigchld(void)
480 bzero(&sa, sizeof(sa));
481 sa.sa_handler = sigchld_handler;
482 sigfillset(&sa.sa_mask);
483 error = sigaction(SIGCHLD, &sa, NULL);
485 log_err(1, "sigaction");
490 handle_request(int iscsi_fd, const struct iscsi_daemon_request *request, int timeout)
492 struct connection *conn;
494 log_set_peer_addr(request->idr_conf.isc_target_addr);
495 if (request->idr_conf.isc_target[0] != '\0') {
496 log_set_peer_name(request->idr_conf.isc_target);
497 setproctitle("%s (%s)", request->idr_conf.isc_target_addr, request->idr_conf.isc_target);
499 setproctitle("%s", request->idr_conf.isc_target_addr);
502 conn = connection_new(iscsi_fd, request);
503 set_timeout(timeout);
506 if (conn->conn_conf.isc_discovery != 0)
511 log_debugx("nothing more to do; exiting");
516 wait_for_children(bool block)
524 * If "block" is true, wait for at least one process.
526 if (block && num == 0)
527 pid = wait4(-1, &status, 0, NULL);
529 pid = wait4(-1, &status, WNOHANG, NULL);
532 if (WIFSIGNALED(status)) {
533 log_warnx("child process %d terminated with signal %d",
534 pid, WTERMSIG(status));
535 } else if (WEXITSTATUS(status) != 0) {
536 log_warnx("child process %d terminated with exit status %d",
537 pid, WEXITSTATUS(status));
539 log_debugx("child process %d terminated gracefully", pid);
548 main(int argc, char **argv)
550 int ch, debug = 0, error, iscsi_fd, maxproc = 30, retval, saved_errno,
552 bool dont_daemonize = false;
555 const char *pidfile_path = DEFAULT_PIDFILE;
556 struct iscsi_daemon_request request;
558 while ((ch = getopt(argc, argv, "P:dl:m:t:")) != -1) {
561 pidfile_path = optarg;
564 dont_daemonize = true;
568 debug = atoi(optarg);
571 maxproc = atoi(optarg);
574 timeout = atoi(optarg);
587 pidfh = pidfile_open(pidfile_path, 0600, &otherpid);
590 log_errx(1, "daemon already running, pid: %jd.",
592 log_err(1, "cannot open or create pidfile \"%s\"",
596 iscsi_fd = open(ISCSI_PATH, O_RDWR);
597 if (iscsi_fd < 0 && errno == ENOENT) {
599 retval = kldload("iscsi");
601 iscsi_fd = open(ISCSI_PATH, O_RDWR);
606 log_err(1, "failed to open %s", ISCSI_PATH);
608 if (dont_daemonize == false) {
609 if (daemon(0, 0) == -1) {
610 log_warn("cannot daemonize");
611 pidfile_remove(pidfh);
616 pidfile_write(pidfh);
621 log_debugx("waiting for request from the kernel");
623 memset(&request, 0, sizeof(request));
624 error = ioctl(iscsi_fd, ISCSIDWAIT, &request);
626 if (errno == EINTR) {
627 nchildren -= wait_for_children(false);
628 assert(nchildren >= 0);
632 log_err(1, "ISCSIDWAIT");
635 if (dont_daemonize) {
636 log_debugx("not forking due to -d flag; "
637 "will exit after servicing a single request");
639 nchildren -= wait_for_children(false);
640 assert(nchildren >= 0);
642 while (maxproc > 0 && nchildren >= maxproc) {
643 log_debugx("maxproc limit of %d child processes hit; "
644 "waiting for child process to exit", maxproc);
645 nchildren -= wait_for_children(true);
646 assert(nchildren >= 0);
648 log_debugx("incoming connection; forking child process #%d",
659 pidfile_close(pidfh);
660 handle_request(iscsi_fd, &request, timeout);