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 addrinfo *from_ai, *to_ai;
157 const char *from_addr, *to_addr;
158 #ifdef ICL_KERNEL_PROXY
159 struct iscsi_daemon_connect idc;
163 conn = calloc(1, sizeof(*conn));
165 log_err(1, "calloc");
168 * Default values, from RFC 3720, section 12.
170 conn->conn_header_digest = CONN_DIGEST_NONE;
171 conn->conn_data_digest = CONN_DIGEST_NONE;
172 conn->conn_initial_r2t = true;
173 conn->conn_immediate_data = true;
174 conn->conn_max_data_segment_length = 8192;
175 conn->conn_max_burst_length = 262144;
176 conn->conn_first_burst_length = 65536;
177 conn->conn_iscsi_fd = iscsi_fd;
179 conn->conn_session_id = request->idr_session_id;
180 memcpy(&conn->conn_conf, &request->idr_conf, sizeof(conn->conn_conf));
181 memcpy(&conn->conn_isid, &request->idr_isid, sizeof(conn->conn_isid));
182 conn->conn_tsih = request->idr_tsih;
183 memcpy(&conn->conn_limits, &request->idr_limits, sizeof(conn->conn_limits));
185 from_addr = conn->conn_conf.isc_initiator_addr;
186 to_addr = conn->conn_conf.isc_target_addr;
188 if (from_addr[0] != '\0')
189 resolve_addr(conn, from_addr, &from_ai, true);
193 resolve_addr(conn, to_addr, &to_ai, false);
195 #ifdef ICL_KERNEL_PROXY
196 if (conn->conn_conf.isc_iser) {
197 memset(&idc, 0, sizeof(idc));
198 idc.idc_session_id = conn->conn_session_id;
199 if (conn->conn_conf.isc_iser)
201 idc.idc_domain = to_ai->ai_family;
202 idc.idc_socktype = to_ai->ai_socktype;
203 idc.idc_protocol = to_ai->ai_protocol;
204 if (from_ai != NULL) {
205 idc.idc_from_addr = from_ai->ai_addr;
206 idc.idc_from_addrlen = from_ai->ai_addrlen;
208 idc.idc_to_addr = to_ai->ai_addr;
209 idc.idc_to_addrlen = to_ai->ai_addrlen;
211 log_debugx("connecting to %s using ICL kernel proxy", to_addr);
212 error = ioctl(iscsi_fd, ISCSIDCONNECT, &idc);
214 fail(conn, strerror(errno));
215 log_err(1, "failed to connect to %s "
216 "using ICL kernel proxy: ISCSIDCONNECT", to_addr);
221 #endif /* ICL_KERNEL_PROXY */
223 if (conn->conn_conf.isc_iser) {
224 fail(conn, "iSER not supported");
225 log_errx(1, "iscsid(8) compiled without ICL_KERNEL_PROXY "
226 "does not support iSER");
229 conn->conn_socket = socket(to_ai->ai_family, to_ai->ai_socktype,
231 if (conn->conn_socket < 0) {
232 fail(conn, strerror(errno));
233 log_err(1, "failed to create socket for %s", from_addr);
235 sockbuf = SOCKBUF_SIZE;
236 if (setsockopt(conn->conn_socket, SOL_SOCKET, SO_RCVBUF,
237 &sockbuf, sizeof(sockbuf)) == -1)
238 log_warn("setsockopt(SO_RCVBUF) failed");
239 sockbuf = SOCKBUF_SIZE;
240 if (setsockopt(conn->conn_socket, SOL_SOCKET, SO_SNDBUF,
241 &sockbuf, sizeof(sockbuf)) == -1)
242 log_warn("setsockopt(SO_SNDBUF) failed");
243 if (from_ai != NULL) {
244 error = bind(conn->conn_socket, from_ai->ai_addr,
245 from_ai->ai_addrlen);
247 fail(conn, strerror(errno));
248 log_err(1, "failed to bind to %s", from_addr);
251 log_debugx("connecting to %s", to_addr);
252 error = connect(conn->conn_socket, to_ai->ai_addr, to_ai->ai_addrlen);
254 fail(conn, strerror(errno));
255 log_err(1, "failed to connect to %s", to_addr);
262 handoff(struct connection *conn)
264 struct iscsi_daemon_handoff idh;
267 log_debugx("handing off connection to the kernel");
269 memset(&idh, 0, sizeof(idh));
270 idh.idh_session_id = conn->conn_session_id;
271 idh.idh_socket = conn->conn_socket;
272 strlcpy(idh.idh_target_alias, conn->conn_target_alias,
273 sizeof(idh.idh_target_alias));
274 idh.idh_tsih = conn->conn_tsih;
275 idh.idh_statsn = conn->conn_statsn;
276 idh.idh_header_digest = conn->conn_header_digest;
277 idh.idh_data_digest = conn->conn_data_digest;
278 idh.idh_initial_r2t = conn->conn_initial_r2t;
279 idh.idh_immediate_data = conn->conn_immediate_data;
280 idh.idh_max_data_segment_length = conn->conn_max_data_segment_length;
281 idh.idh_max_burst_length = conn->conn_max_burst_length;
282 idh.idh_first_burst_length = conn->conn_first_burst_length;
284 error = ioctl(conn->conn_iscsi_fd, ISCSIDHANDOFF, &idh);
286 log_err(1, "ISCSIDHANDOFF");
290 fail(const struct connection *conn, const char *reason)
292 struct iscsi_daemon_fail idf;
293 int error, saved_errno;
297 memset(&idf, 0, sizeof(idf));
298 idf.idf_session_id = conn->conn_session_id;
299 strlcpy(idf.idf_reason, reason, sizeof(idf.idf_reason));
301 error = ioctl(conn->conn_iscsi_fd, ISCSIDFAIL, &idf);
303 log_err(1, "ISCSIDFAIL");
309 * XXX: I CANT INTO LATIN
312 capsicate(struct connection *conn)
316 #ifdef ICL_KERNEL_PROXY
317 const unsigned long cmds[] = { ISCSIDCONNECT, ISCSIDSEND, ISCSIDRECEIVE,
318 ISCSIDHANDOFF, ISCSIDFAIL, ISCSISADD, ISCSISREMOVE, ISCSISMODIFY };
320 const unsigned long cmds[] = { ISCSIDHANDOFF, ISCSIDFAIL, ISCSISADD,
321 ISCSISREMOVE, ISCSISMODIFY };
324 cap_rights_init(&rights, CAP_IOCTL);
325 error = cap_rights_limit(conn->conn_iscsi_fd, &rights);
326 if (error != 0 && errno != ENOSYS)
327 log_err(1, "cap_rights_limit");
329 error = cap_ioctls_limit(conn->conn_iscsi_fd, cmds,
330 sizeof(cmds) / sizeof(cmds[0]));
331 if (error != 0 && errno != ENOSYS)
332 log_err(1, "cap_ioctls_limit");
335 if (error != 0 && errno != ENOSYS)
336 log_err(1, "cap_enter");
339 log_debugx("Capsicum capability mode enabled");
341 log_warnx("Capsicum capability mode not supported");
348 return (sigalrm_received);
352 sigalrm_handler(int dummy __unused)
355 * It would be easiest to just log an error and exit. We can't
356 * do this, though, because log_errx() is not signal safe, since
357 * it calls syslog(3). Instead, set a flag checked by pdu_send()
358 * and pdu_receive(), to call log_errx() there. Should they fail
359 * to notice, we'll exit here one second later.
361 if (sigalrm_received) {
363 * Oh well. Just give up and quit.
368 sigalrm_received = true;
372 set_timeout(int timeout)
375 struct itimerval itv;
379 log_debugx("session timeout disabled");
383 bzero(&sa, sizeof(sa));
384 sa.sa_handler = sigalrm_handler;
385 sigfillset(&sa.sa_mask);
386 error = sigaction(SIGALRM, &sa, NULL);
388 log_err(1, "sigaction");
391 * First SIGALRM will arive after conf_timeout seconds.
392 * If we do nothing, another one will arrive a second later.
394 bzero(&itv, sizeof(itv));
395 itv.it_interval.tv_sec = 1;
396 itv.it_value.tv_sec = timeout;
398 log_debugx("setting session timeout to %d seconds",
400 error = setitimer(ITIMER_REAL, &itv, NULL);
402 log_err(1, "setitimer");
406 sigchld_handler(int dummy __unused)
410 * The only purpose of this handler is to make SIGCHLD
411 * interrupt the ISCSIDWAIT ioctl(2), so we can call
412 * wait_for_children().
417 register_sigchld(void)
422 bzero(&sa, sizeof(sa));
423 sa.sa_handler = sigchld_handler;
424 sigfillset(&sa.sa_mask);
425 error = sigaction(SIGCHLD, &sa, NULL);
427 log_err(1, "sigaction");
432 handle_request(int iscsi_fd, const struct iscsi_daemon_request *request, int timeout)
434 struct connection *conn;
436 log_set_peer_addr(request->idr_conf.isc_target_addr);
437 if (request->idr_conf.isc_target[0] != '\0') {
438 log_set_peer_name(request->idr_conf.isc_target);
439 setproctitle("%s (%s)", request->idr_conf.isc_target_addr, request->idr_conf.isc_target);
441 setproctitle("%s", request->idr_conf.isc_target_addr);
444 conn = connection_new(iscsi_fd, request);
445 set_timeout(timeout);
448 if (conn->conn_conf.isc_discovery != 0)
453 log_debugx("nothing more to do; exiting");
458 wait_for_children(bool block)
466 * If "block" is true, wait for at least one process.
468 if (block && num == 0)
469 pid = wait4(-1, &status, 0, NULL);
471 pid = wait4(-1, &status, WNOHANG, NULL);
474 if (WIFSIGNALED(status)) {
475 log_warnx("child process %d terminated with signal %d",
476 pid, WTERMSIG(status));
477 } else if (WEXITSTATUS(status) != 0) {
478 log_warnx("child process %d terminated with exit status %d",
479 pid, WEXITSTATUS(status));
481 log_debugx("child process %d terminated gracefully", pid);
490 main(int argc, char **argv)
492 int ch, debug = 0, error, iscsi_fd, maxproc = 30, retval, saved_errno,
494 bool dont_daemonize = false;
497 const char *pidfile_path = DEFAULT_PIDFILE;
498 struct iscsi_daemon_request request;
500 while ((ch = getopt(argc, argv, "P:dl:m:t:")) != -1) {
503 pidfile_path = optarg;
506 dont_daemonize = true;
510 debug = atoi(optarg);
513 maxproc = atoi(optarg);
516 timeout = atoi(optarg);
529 pidfh = pidfile_open(pidfile_path, 0600, &otherpid);
532 log_errx(1, "daemon already running, pid: %jd.",
534 log_err(1, "cannot open or create pidfile \"%s\"",
538 iscsi_fd = open(ISCSI_PATH, O_RDWR);
539 if (iscsi_fd < 0 && errno == ENOENT) {
541 retval = kldload("iscsi");
543 iscsi_fd = open(ISCSI_PATH, O_RDWR);
548 log_err(1, "failed to open %s", ISCSI_PATH);
550 if (dont_daemonize == false) {
551 if (daemon(0, 0) == -1) {
552 log_warn("cannot daemonize");
553 pidfile_remove(pidfh);
558 pidfile_write(pidfh);
563 log_debugx("waiting for request from the kernel");
565 memset(&request, 0, sizeof(request));
566 error = ioctl(iscsi_fd, ISCSIDWAIT, &request);
568 if (errno == EINTR) {
569 nchildren -= wait_for_children(false);
570 assert(nchildren >= 0);
574 log_err(1, "ISCSIDWAIT");
577 if (dont_daemonize) {
578 log_debugx("not forking due to -d flag; "
579 "will exit after servicing a single request");
581 nchildren -= wait_for_children(false);
582 assert(nchildren >= 0);
584 while (maxproc > 0 && nchildren >= maxproc) {
585 log_debugx("maxproc limit of %d child processes hit; "
586 "waiting for child process to exit", maxproc);
587 nchildren -= wait_for_children(true);
588 assert(nchildren >= 0);
590 log_debugx("incoming connection; forking child process #%d",
601 pidfile_close(pidfh);
602 handle_request(iscsi_fd, &request, timeout);