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>
58 static volatile bool sigalrm_received = false;
60 static int nchildren = 0;
66 fprintf(stderr, "usage: iscsid [-P pidfile][-d][-m maxproc][-t timeout]\n");
71 checked_strdup(const char *s)
82 resolve_addr(const struct connection *conn, const char *address,
83 struct addrinfo **ai, bool initiator_side)
85 struct addrinfo hints;
86 char *arg, *addr, *ch;
88 int error, colons = 0;
90 arg = checked_strdup(address);
93 fail(conn, "empty address");
94 log_errx(1, "empty address");
98 * IPv6 address in square brackets, perhaps with port.
101 addr = strsep(&arg, "]");
103 fail(conn, "malformed address");
104 log_errx(1, "malformed address %s", address);
106 if (arg[0] == '\0') {
108 } else if (arg[0] == ':') {
111 fail(conn, "malformed address");
112 log_errx(1, "malformed address %s", address);
116 * Either IPv6 address without brackets - and without
117 * a port - or IPv4 address. Just count the colons.
119 for (ch = arg; *ch != '\0'; ch++) {
127 addr = strsep(&arg, ":");
135 if (port == NULL && !initiator_side)
138 memset(&hints, 0, sizeof(hints));
139 hints.ai_family = PF_UNSPEC;
140 hints.ai_socktype = SOCK_STREAM;
141 hints.ai_flags = AI_ADDRCONFIG | AI_NUMERICSERV;
143 hints.ai_flags |= AI_PASSIVE;
145 error = getaddrinfo(addr, port, &hints, ai);
147 fail(conn, gai_strerror(error));
148 log_errx(1, "getaddrinfo for %s failed: %s",
149 address, gai_strerror(error));
153 static struct connection *
154 connection_new(int iscsi_fd, const struct iscsi_daemon_request *request)
156 struct connection *conn;
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_data_segment_length = 8192;
176 conn->conn_max_burst_length = 262144;
177 conn->conn_first_burst_length = 65536;
178 conn->conn_iscsi_fd = iscsi_fd;
180 conn->conn_session_id = request->idr_session_id;
181 memcpy(&conn->conn_conf, &request->idr_conf, sizeof(conn->conn_conf));
182 memcpy(&conn->conn_isid, &request->idr_isid, sizeof(conn->conn_isid));
183 conn->conn_tsih = request->idr_tsih;
184 memcpy(&conn->conn_limits, &request->idr_limits, sizeof(conn->conn_limits));
186 from_addr = conn->conn_conf.isc_initiator_addr;
187 to_addr = conn->conn_conf.isc_target_addr;
189 if (from_addr[0] != '\0')
190 resolve_addr(conn, from_addr, &from_ai, true);
194 resolve_addr(conn, to_addr, &to_ai, false);
196 #ifdef ICL_KERNEL_PROXY
197 if (conn->conn_conf.isc_iser) {
198 memset(&idc, 0, sizeof(idc));
199 idc.idc_session_id = conn->conn_session_id;
200 if (conn->conn_conf.isc_iser)
202 idc.idc_domain = to_ai->ai_family;
203 idc.idc_socktype = to_ai->ai_socktype;
204 idc.idc_protocol = to_ai->ai_protocol;
205 if (from_ai != NULL) {
206 idc.idc_from_addr = from_ai->ai_addr;
207 idc.idc_from_addrlen = from_ai->ai_addrlen;
209 idc.idc_to_addr = to_ai->ai_addr;
210 idc.idc_to_addrlen = to_ai->ai_addrlen;
212 log_debugx("connecting to %s using ICL kernel proxy", to_addr);
213 error = ioctl(iscsi_fd, ISCSIDCONNECT, &idc);
215 fail(conn, strerror(errno));
216 log_err(1, "failed to connect to %s "
217 "using ICL kernel proxy: ISCSIDCONNECT", to_addr);
222 #endif /* ICL_KERNEL_PROXY */
224 if (conn->conn_conf.isc_iser) {
225 fail(conn, "iSER not supported");
226 log_errx(1, "iscsid(8) compiled without ICL_KERNEL_PROXY "
227 "does not support iSER");
230 conn->conn_socket = socket(to_ai->ai_family, to_ai->ai_socktype,
232 if (conn->conn_socket < 0) {
233 fail(conn, strerror(errno));
234 log_err(1, "failed to create socket for %s", from_addr);
236 sockbuf = SOCKBUF_SIZE;
237 if (setsockopt(conn->conn_socket, SOL_SOCKET, SO_RCVBUF,
238 &sockbuf, sizeof(sockbuf)) == -1)
239 log_warn("setsockopt(SO_RCVBUF) failed");
240 sockbuf = SOCKBUF_SIZE;
241 if (setsockopt(conn->conn_socket, SOL_SOCKET, SO_SNDBUF,
242 &sockbuf, sizeof(sockbuf)) == -1)
243 log_warn("setsockopt(SO_SNDBUF) failed");
244 if (from_ai != NULL) {
245 error = bind(conn->conn_socket, from_ai->ai_addr,
246 from_ai->ai_addrlen);
248 fail(conn, strerror(errno));
249 log_err(1, "failed to bind to %s", from_addr);
252 log_debugx("connecting to %s", to_addr);
253 error = connect(conn->conn_socket, to_ai->ai_addr, to_ai->ai_addrlen);
255 fail(conn, strerror(errno));
256 log_err(1, "failed to connect to %s", to_addr);
263 handoff(struct connection *conn)
265 struct iscsi_daemon_handoff idh;
268 log_debugx("handing off connection to the kernel");
270 memset(&idh, 0, sizeof(idh));
271 idh.idh_session_id = conn->conn_session_id;
272 idh.idh_socket = conn->conn_socket;
273 strlcpy(idh.idh_target_alias, conn->conn_target_alias,
274 sizeof(idh.idh_target_alias));
275 idh.idh_tsih = conn->conn_tsih;
276 idh.idh_statsn = conn->conn_statsn;
277 idh.idh_header_digest = conn->conn_header_digest;
278 idh.idh_data_digest = conn->conn_data_digest;
279 idh.idh_initial_r2t = conn->conn_initial_r2t;
280 idh.idh_immediate_data = conn->conn_immediate_data;
281 idh.idh_max_data_segment_length = conn->conn_max_data_segment_length;
282 idh.idh_max_burst_length = conn->conn_max_burst_length;
283 idh.idh_first_burst_length = conn->conn_first_burst_length;
285 error = ioctl(conn->conn_iscsi_fd, ISCSIDHANDOFF, &idh);
287 log_err(1, "ISCSIDHANDOFF");
291 fail(const struct connection *conn, const char *reason)
293 struct iscsi_daemon_fail idf;
296 memset(&idf, 0, sizeof(idf));
297 idf.idf_session_id = conn->conn_session_id;
298 strlcpy(idf.idf_reason, reason, sizeof(idf.idf_reason));
300 error = ioctl(conn->conn_iscsi_fd, ISCSIDFAIL, &idf);
302 log_err(1, "ISCSIDFAIL");
306 * XXX: I CANT INTO LATIN
309 capsicate(struct connection *conn)
313 #ifdef ICL_KERNEL_PROXY
314 const unsigned long cmds[] = { ISCSIDCONNECT, ISCSIDSEND, ISCSIDRECEIVE,
315 ISCSIDHANDOFF, ISCSIDFAIL, ISCSISADD, ISCSISREMOVE, ISCSISMODIFY };
317 const unsigned long cmds[] = { ISCSIDHANDOFF, ISCSIDFAIL, ISCSISADD,
318 ISCSISREMOVE, ISCSISMODIFY };
321 cap_rights_init(&rights, CAP_IOCTL);
322 error = cap_rights_limit(conn->conn_iscsi_fd, &rights);
323 if (error != 0 && errno != ENOSYS)
324 log_err(1, "cap_rights_limit");
326 error = cap_ioctls_limit(conn->conn_iscsi_fd, cmds,
327 sizeof(cmds) / sizeof(cmds[0]));
328 if (error != 0 && errno != ENOSYS)
329 log_err(1, "cap_ioctls_limit");
332 if (error != 0 && errno != ENOSYS)
333 log_err(1, "cap_enter");
336 log_debugx("Capsicum capability mode enabled");
338 log_warnx("Capsicum capability mode not supported");
345 return (sigalrm_received);
349 sigalrm_handler(int dummy __unused)
352 * It would be easiest to just log an error and exit. We can't
353 * do this, though, because log_errx() is not signal safe, since
354 * it calls syslog(3). Instead, set a flag checked by pdu_send()
355 * and pdu_receive(), to call log_errx() there. Should they fail
356 * to notice, we'll exit here one second later.
358 if (sigalrm_received) {
360 * Oh well. Just give up and quit.
365 sigalrm_received = true;
369 set_timeout(int timeout)
372 struct itimerval itv;
376 log_debugx("session timeout disabled");
380 bzero(&sa, sizeof(sa));
381 sa.sa_handler = sigalrm_handler;
382 sigfillset(&sa.sa_mask);
383 error = sigaction(SIGALRM, &sa, NULL);
385 log_err(1, "sigaction");
388 * First SIGALRM will arive after conf_timeout seconds.
389 * If we do nothing, another one will arrive a second later.
391 bzero(&itv, sizeof(itv));
392 itv.it_interval.tv_sec = 1;
393 itv.it_value.tv_sec = timeout;
395 log_debugx("setting session timeout to %d seconds",
397 error = setitimer(ITIMER_REAL, &itv, NULL);
399 log_err(1, "setitimer");
403 sigchld_handler(int dummy __unused)
407 * The only purpose of this handler is to make SIGCHLD
408 * interrupt the ISCSIDWAIT ioctl(2), so we can call
409 * wait_for_children().
414 register_sigchld(void)
419 bzero(&sa, sizeof(sa));
420 sa.sa_handler = sigchld_handler;
421 sigfillset(&sa.sa_mask);
422 error = sigaction(SIGCHLD, &sa, NULL);
424 log_err(1, "sigaction");
429 handle_request(int iscsi_fd, const struct iscsi_daemon_request *request, int timeout)
431 struct connection *conn;
433 log_set_peer_addr(request->idr_conf.isc_target_addr);
434 if (request->idr_conf.isc_target[0] != '\0') {
435 log_set_peer_name(request->idr_conf.isc_target);
436 setproctitle("%s (%s)", request->idr_conf.isc_target_addr, request->idr_conf.isc_target);
438 setproctitle("%s", request->idr_conf.isc_target_addr);
441 conn = connection_new(iscsi_fd, request);
442 set_timeout(timeout);
445 if (conn->conn_conf.isc_discovery != 0)
450 log_debugx("nothing more to do; exiting");
455 wait_for_children(bool block)
463 * If "block" is true, wait for at least one process.
465 if (block && num == 0)
466 pid = wait4(-1, &status, 0, NULL);
468 pid = wait4(-1, &status, WNOHANG, NULL);
471 if (WIFSIGNALED(status)) {
472 log_warnx("child process %d terminated with signal %d",
473 pid, WTERMSIG(status));
474 } else if (WEXITSTATUS(status) != 0) {
475 log_warnx("child process %d terminated with exit status %d",
476 pid, WEXITSTATUS(status));
478 log_debugx("child process %d terminated gracefully", pid);
487 main(int argc, char **argv)
489 int ch, debug = 0, error, iscsi_fd, maxproc = 30, retval, saved_errno,
491 bool dont_daemonize = false;
494 const char *pidfile_path = DEFAULT_PIDFILE;
495 struct iscsi_daemon_request request;
497 while ((ch = getopt(argc, argv, "P:dl:m:t:")) != -1) {
500 pidfile_path = optarg;
503 dont_daemonize = true;
507 debug = atoi(optarg);
510 maxproc = atoi(optarg);
513 timeout = atoi(optarg);
526 pidfh = pidfile_open(pidfile_path, 0600, &otherpid);
529 log_errx(1, "daemon already running, pid: %jd.",
531 log_err(1, "cannot open or create pidfile \"%s\"",
535 iscsi_fd = open(ISCSI_PATH, O_RDWR);
536 if (iscsi_fd < 0 && errno == ENOENT) {
538 retval = kldload("iscsi");
540 iscsi_fd = open(ISCSI_PATH, O_RDWR);
545 log_err(1, "failed to open %s", ISCSI_PATH);
547 if (dont_daemonize == false) {
548 if (daemon(0, 0) == -1) {
549 log_warn("cannot daemonize");
550 pidfile_remove(pidfh);
555 pidfile_write(pidfh);
560 log_debugx("waiting for request from the kernel");
562 memset(&request, 0, sizeof(request));
563 error = ioctl(iscsi_fd, ISCSIDWAIT, &request);
565 if (errno == EINTR) {
566 nchildren -= wait_for_children(false);
567 assert(nchildren >= 0);
571 log_err(1, "ISCSIDWAIT");
574 if (dont_daemonize) {
575 log_debugx("not forking due to -d flag; "
576 "will exit after servicing a single request");
578 nchildren -= wait_for_children(false);
579 assert(nchildren >= 0);
581 while (maxproc > 0 && nchildren >= maxproc) {
582 log_debugx("maxproc limit of %d child processes hit; "
583 "waiting for child process to exit", maxproc);
584 nchildren -= wait_for_children(true);
585 assert(nchildren >= 0);
587 log_debugx("incoming connection; forking child process #%d",
598 pidfile_close(pidfh);
599 handle_request(iscsi_fd, &request, timeout);