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_burst_length = MAX_BURST_LENGTH;
176 conn->conn_first_burst_length = FIRST_BURST_LENGTH;
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;
185 * Read the driver limits and provide reasonable defaults for the ones
186 * the driver doesn't care about. If a max_snd_dsl is not explicitly
187 * provided by the driver then we'll make sure both conn->max_snd_dsl
188 * and isl->max_snd_dsl are set to the rcv_dsl. This preserves historic
191 isl = &conn->conn_limits;
192 memcpy(isl, &request->idr_limits, sizeof(*isl));
193 if (isl->isl_max_recv_data_segment_length == 0) {
194 conn->conn_max_recv_data_segment_length = 8192;
195 conn->conn_max_send_data_segment_length = 8192;
196 isl->isl_max_recv_data_segment_length = 8192;
198 conn->conn_max_recv_data_segment_length =
199 isl->isl_max_recv_data_segment_length;
200 conn->conn_max_send_data_segment_length =
201 isl->isl_max_recv_data_segment_length;
203 if (isl->isl_max_send_data_segment_length == 0) {
204 isl->isl_max_send_data_segment_length =
205 isl->isl_max_recv_data_segment_length;
207 conn->conn_max_send_data_segment_length =
208 isl->isl_max_send_data_segment_length;
210 if (isl->isl_max_burst_length == 0)
211 isl->isl_max_burst_length = conn->conn_max_burst_length;
212 if (isl->isl_first_burst_length == 0) {
213 if (isl->isl_max_burst_length < (int)conn->conn_first_burst_length)
214 isl->isl_first_burst_length = isl->isl_max_burst_length;
216 isl->isl_first_burst_length = conn->conn_first_burst_length;
219 from_addr = conn->conn_conf.isc_initiator_addr;
220 to_addr = conn->conn_conf.isc_target_addr;
222 if (from_addr[0] != '\0')
223 resolve_addr(conn, from_addr, &from_ai, true);
227 resolve_addr(conn, to_addr, &to_ai, false);
229 #ifdef ICL_KERNEL_PROXY
230 if (conn->conn_conf.isc_iser) {
231 memset(&idc, 0, sizeof(idc));
232 idc.idc_session_id = conn->conn_session_id;
233 if (conn->conn_conf.isc_iser)
235 idc.idc_domain = to_ai->ai_family;
236 idc.idc_socktype = to_ai->ai_socktype;
237 idc.idc_protocol = to_ai->ai_protocol;
238 if (from_ai != NULL) {
239 idc.idc_from_addr = from_ai->ai_addr;
240 idc.idc_from_addrlen = from_ai->ai_addrlen;
242 idc.idc_to_addr = to_ai->ai_addr;
243 idc.idc_to_addrlen = to_ai->ai_addrlen;
245 log_debugx("connecting to %s using ICL kernel proxy", to_addr);
246 error = ioctl(iscsi_fd, ISCSIDCONNECT, &idc);
248 fail(conn, strerror(errno));
249 log_err(1, "failed to connect to %s "
250 "using ICL kernel proxy: ISCSIDCONNECT", to_addr);
255 #endif /* ICL_KERNEL_PROXY */
257 if (conn->conn_conf.isc_iser) {
258 fail(conn, "iSER not supported");
259 log_errx(1, "iscsid(8) compiled without ICL_KERNEL_PROXY "
260 "does not support iSER");
263 conn->conn_socket = socket(to_ai->ai_family, to_ai->ai_socktype,
265 if (conn->conn_socket < 0) {
266 fail(conn, strerror(errno));
267 log_err(1, "failed to create socket for %s", from_addr);
269 sockbuf = SOCKBUF_SIZE;
270 if (setsockopt(conn->conn_socket, SOL_SOCKET, SO_RCVBUF,
271 &sockbuf, sizeof(sockbuf)) == -1)
272 log_warn("setsockopt(SO_RCVBUF) failed");
273 sockbuf = SOCKBUF_SIZE;
274 if (setsockopt(conn->conn_socket, SOL_SOCKET, SO_SNDBUF,
275 &sockbuf, sizeof(sockbuf)) == -1)
276 log_warn("setsockopt(SO_SNDBUF) failed");
277 if (from_ai != NULL) {
278 error = bind(conn->conn_socket, from_ai->ai_addr,
279 from_ai->ai_addrlen);
281 fail(conn, strerror(errno));
282 log_err(1, "failed to bind to %s", from_addr);
285 log_debugx("connecting to %s", to_addr);
286 error = connect(conn->conn_socket, to_ai->ai_addr, to_ai->ai_addrlen);
288 fail(conn, strerror(errno));
289 log_err(1, "failed to connect to %s", to_addr);
296 handoff(struct connection *conn)
298 struct iscsi_daemon_handoff idh;
301 log_debugx("handing off connection to the kernel");
303 memset(&idh, 0, sizeof(idh));
304 idh.idh_session_id = conn->conn_session_id;
305 idh.idh_socket = conn->conn_socket;
306 strlcpy(idh.idh_target_alias, conn->conn_target_alias,
307 sizeof(idh.idh_target_alias));
308 idh.idh_tsih = conn->conn_tsih;
309 idh.idh_statsn = conn->conn_statsn;
310 idh.idh_header_digest = conn->conn_header_digest;
311 idh.idh_data_digest = conn->conn_data_digest;
312 idh.idh_initial_r2t = conn->conn_initial_r2t;
313 idh.idh_immediate_data = conn->conn_immediate_data;
314 idh.idh_max_recv_data_segment_length =
315 conn->conn_max_recv_data_segment_length;
316 idh.idh_max_send_data_segment_length =
317 conn->conn_max_send_data_segment_length;
318 idh.idh_max_burst_length = conn->conn_max_burst_length;
319 idh.idh_first_burst_length = conn->conn_first_burst_length;
321 error = ioctl(conn->conn_iscsi_fd, ISCSIDHANDOFF, &idh);
323 log_err(1, "ISCSIDHANDOFF");
327 fail(const struct connection *conn, const char *reason)
329 struct iscsi_daemon_fail idf;
330 int error, saved_errno;
334 memset(&idf, 0, sizeof(idf));
335 idf.idf_session_id = conn->conn_session_id;
336 strlcpy(idf.idf_reason, reason, sizeof(idf.idf_reason));
338 error = ioctl(conn->conn_iscsi_fd, ISCSIDFAIL, &idf);
340 log_err(1, "ISCSIDFAIL");
346 * XXX: I CANT INTO LATIN
349 capsicate(struct connection *conn)
353 #ifdef ICL_KERNEL_PROXY
354 const unsigned long cmds[] = { ISCSIDCONNECT, ISCSIDSEND, ISCSIDRECEIVE,
355 ISCSIDHANDOFF, ISCSIDFAIL, ISCSISADD, ISCSISREMOVE, ISCSISMODIFY };
357 const unsigned long cmds[] = { ISCSIDHANDOFF, ISCSIDFAIL, ISCSISADD,
358 ISCSISREMOVE, ISCSISMODIFY };
361 cap_rights_init(&rights, CAP_IOCTL);
362 error = cap_rights_limit(conn->conn_iscsi_fd, &rights);
363 if (error != 0 && errno != ENOSYS)
364 log_err(1, "cap_rights_limit");
366 error = cap_ioctls_limit(conn->conn_iscsi_fd, cmds,
367 sizeof(cmds) / sizeof(cmds[0]));
368 if (error != 0 && errno != ENOSYS)
369 log_err(1, "cap_ioctls_limit");
372 if (error != 0 && errno != ENOSYS)
373 log_err(1, "cap_enter");
376 log_debugx("Capsicum capability mode enabled");
378 log_warnx("Capsicum capability mode not supported");
385 return (sigalrm_received);
389 sigalrm_handler(int dummy __unused)
392 * It would be easiest to just log an error and exit. We can't
393 * do this, though, because log_errx() is not signal safe, since
394 * it calls syslog(3). Instead, set a flag checked by pdu_send()
395 * and pdu_receive(), to call log_errx() there. Should they fail
396 * to notice, we'll exit here one second later.
398 if (sigalrm_received) {
400 * Oh well. Just give up and quit.
405 sigalrm_received = true;
409 set_timeout(int timeout)
412 struct itimerval itv;
416 log_debugx("session timeout disabled");
420 bzero(&sa, sizeof(sa));
421 sa.sa_handler = sigalrm_handler;
422 sigfillset(&sa.sa_mask);
423 error = sigaction(SIGALRM, &sa, NULL);
425 log_err(1, "sigaction");
428 * First SIGALRM will arive after conf_timeout seconds.
429 * If we do nothing, another one will arrive a second later.
431 bzero(&itv, sizeof(itv));
432 itv.it_interval.tv_sec = 1;
433 itv.it_value.tv_sec = timeout;
435 log_debugx("setting session timeout to %d seconds",
437 error = setitimer(ITIMER_REAL, &itv, NULL);
439 log_err(1, "setitimer");
443 sigchld_handler(int dummy __unused)
447 * The only purpose of this handler is to make SIGCHLD
448 * interrupt the ISCSIDWAIT ioctl(2), so we can call
449 * wait_for_children().
454 register_sigchld(void)
459 bzero(&sa, sizeof(sa));
460 sa.sa_handler = sigchld_handler;
461 sigfillset(&sa.sa_mask);
462 error = sigaction(SIGCHLD, &sa, NULL);
464 log_err(1, "sigaction");
469 handle_request(int iscsi_fd, const struct iscsi_daemon_request *request, int timeout)
471 struct connection *conn;
473 log_set_peer_addr(request->idr_conf.isc_target_addr);
474 if (request->idr_conf.isc_target[0] != '\0') {
475 log_set_peer_name(request->idr_conf.isc_target);
476 setproctitle("%s (%s)", request->idr_conf.isc_target_addr, request->idr_conf.isc_target);
478 setproctitle("%s", request->idr_conf.isc_target_addr);
481 conn = connection_new(iscsi_fd, request);
482 set_timeout(timeout);
485 if (conn->conn_conf.isc_discovery != 0)
490 log_debugx("nothing more to do; exiting");
495 wait_for_children(bool block)
503 * If "block" is true, wait for at least one process.
505 if (block && num == 0)
506 pid = wait4(-1, &status, 0, NULL);
508 pid = wait4(-1, &status, WNOHANG, NULL);
511 if (WIFSIGNALED(status)) {
512 log_warnx("child process %d terminated with signal %d",
513 pid, WTERMSIG(status));
514 } else if (WEXITSTATUS(status) != 0) {
515 log_warnx("child process %d terminated with exit status %d",
516 pid, WEXITSTATUS(status));
518 log_debugx("child process %d terminated gracefully", pid);
527 main(int argc, char **argv)
529 int ch, debug = 0, error, iscsi_fd, maxproc = 30, retval, saved_errno,
531 bool dont_daemonize = false;
534 const char *pidfile_path = DEFAULT_PIDFILE;
535 struct iscsi_daemon_request request;
537 while ((ch = getopt(argc, argv, "P:dl:m:t:")) != -1) {
540 pidfile_path = optarg;
543 dont_daemonize = true;
547 debug = atoi(optarg);
550 maxproc = atoi(optarg);
553 timeout = atoi(optarg);
566 pidfh = pidfile_open(pidfile_path, 0600, &otherpid);
569 log_errx(1, "daemon already running, pid: %jd.",
571 log_err(1, "cannot open or create pidfile \"%s\"",
575 iscsi_fd = open(ISCSI_PATH, O_RDWR);
576 if (iscsi_fd < 0 && errno == ENOENT) {
578 retval = kldload("iscsi");
580 iscsi_fd = open(ISCSI_PATH, O_RDWR);
585 log_err(1, "failed to open %s", ISCSI_PATH);
587 if (dont_daemonize == false) {
588 if (daemon(0, 0) == -1) {
589 log_warn("cannot daemonize");
590 pidfile_remove(pidfh);
595 pidfile_write(pidfh);
600 log_debugx("waiting for request from the kernel");
602 memset(&request, 0, sizeof(request));
603 error = ioctl(iscsi_fd, ISCSIDWAIT, &request);
605 if (errno == EINTR) {
606 nchildren -= wait_for_children(false);
607 assert(nchildren >= 0);
611 log_err(1, "ISCSIDWAIT");
614 if (dont_daemonize) {
615 log_debugx("not forking due to -d flag; "
616 "will exit after servicing a single request");
618 nchildren -= wait_for_children(false);
619 assert(nchildren >= 0);
621 while (maxproc > 0 && nchildren >= maxproc) {
622 log_debugx("maxproc limit of %d child processes hit; "
623 "waiting for child process to exit", maxproc);
624 nchildren -= wait_for_children(true);
625 assert(nchildren >= 0);
627 log_debugx("incoming connection; forking child process #%d",
638 pidfile_close(pidfh);
639 handle_request(iscsi_fd, &request, timeout);