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-rw-r--r--usr.sbin/iscsid/iscsid.c576
1 files changed, 576 insertions, 0 deletions
diff --git a/usr.sbin/iscsid/iscsid.c b/usr.sbin/iscsid/iscsid.c
new file mode 100644
index 0000000..7943eb1
--- /dev/null
+++ b/usr.sbin/iscsid/iscsid.c
@@ -0,0 +1,576 @@
+/*-
+ * Copyright (c) 2012 The FreeBSD Foundation
+ * All rights reserved.
+ *
+ * This software was developed by Edward Tomasz Napierala under sponsorship
+ * from the FreeBSD Foundation.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+#include <sys/types.h>
+#include <sys/time.h>
+#include <sys/ioctl.h>
+#include <sys/param.h>
+#include <sys/linker.h>
+#include <sys/socket.h>
+#include <sys/capability.h>
+#include <sys/wait.h>
+#include <assert.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <netdb.h>
+#include <signal.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include <libutil.h>
+
+#include "iscsid.h"
+
+static volatile bool sigalrm_received = false;
+
+static int nchildren = 0;
+
+static void
+usage(void)
+{
+
+ fprintf(stderr, "usage: iscsid [-P pidfile][-d][-m maxproc][-t timeout]\n");
+ exit(1);
+}
+
+char *
+checked_strdup(const char *s)
+{
+ char *c;
+
+ c = strdup(s);
+ if (c == NULL)
+ log_err(1, "strdup");
+ return (c);
+}
+
+static int
+resolve_addr(const char *address, struct addrinfo **ai)
+{
+ struct addrinfo hints;
+ char *arg, *addr, *ch;
+ const char *port;
+ int error, colons = 0;
+
+ arg = checked_strdup(address);
+
+ if (arg[0] == '\0') {
+ log_warnx("empty address");
+ return (1);
+ }
+ if (arg[0] == '[') {
+ /*
+ * IPv6 address in square brackets, perhaps with port.
+ */
+ arg++;
+ addr = strsep(&arg, "]");
+ if (arg == NULL) {
+ log_warnx("invalid address %s", address);
+ return (1);
+ }
+ if (arg[0] == '\0') {
+ port = "3260";
+ } else if (arg[0] == ':') {
+ port = arg + 1;
+ } else {
+ log_warnx("invalid address %s", address);
+ return (1);
+ }
+ } else {
+ /*
+ * Either IPv6 address without brackets - and without
+ * a port - or IPv4 address. Just count the colons.
+ */
+ for (ch = arg; *ch != '\0'; ch++) {
+ if (*ch == ':')
+ colons++;
+ }
+ if (colons > 1) {
+ addr = arg;
+ port = "3260";
+ } else {
+ addr = strsep(&arg, ":");
+ if (arg == NULL)
+ port = "3260";
+ else
+ port = arg;
+ }
+ }
+
+ memset(&hints, 0, sizeof(hints));
+ hints.ai_family = PF_UNSPEC;
+ hints.ai_socktype = SOCK_STREAM;
+ hints.ai_flags = AI_PASSIVE;
+
+ error = getaddrinfo(addr, port, &hints, ai);
+ if (error != 0) {
+ log_warnx("getaddrinfo for %s failed: %s",
+ address, gai_strerror(error));
+ return (1);
+ }
+
+ return (0);
+}
+
+static struct connection *
+connection_new(unsigned int session_id, const struct iscsi_session_conf *conf,
+ int iscsi_fd)
+{
+ struct connection *conn;
+ struct addrinfo *from_ai, *to_ai;
+ const char *from_addr, *to_addr;
+#ifdef ICL_KERNEL_PROXY
+ struct iscsi_daemon_connect *idc;
+#endif
+ int error;
+
+ conn = calloc(1, sizeof(*conn));
+ if (conn == NULL)
+ log_err(1, "calloc");
+
+ /*
+ * Default values, from RFC 3720, section 12.
+ */
+ conn->conn_header_digest = CONN_DIGEST_NONE;
+ conn->conn_data_digest = CONN_DIGEST_NONE;
+ conn->conn_initial_r2t = true;
+ conn->conn_immediate_data = true;
+ conn->conn_max_data_segment_length = 8192;
+ conn->conn_max_burst_length = 262144;
+ conn->conn_first_burst_length = 65536;
+
+ conn->conn_session_id = session_id;
+ /*
+ * XXX: Should we sanitize this somehow?
+ */
+ memcpy(&conn->conn_conf, conf, sizeof(conn->conn_conf));
+
+ from_addr = conn->conn_conf.isc_initiator_addr;
+ to_addr = conn->conn_conf.isc_target_addr;
+
+ if (from_addr[0] != '\0') {
+ error = resolve_addr(from_addr, &from_ai);
+ if (error != 0)
+ log_errx(1, "failed to resolve initiator address %s",
+ from_addr);
+ } else {
+ from_ai = NULL;
+ }
+
+ error = resolve_addr(to_addr, &to_ai);
+ if (error != 0)
+ log_errx(1, "failed to resolve target address %s", to_addr);
+
+ conn->conn_iscsi_fd = iscsi_fd;
+
+#ifdef ICL_KERNEL_PROXY
+
+ idc = calloc(1, sizeof(*idc));
+ if (idc == NULL)
+ log_err(1, "calloc");
+
+ idc->idc_session_id = conn->conn_session_id;
+ if (conn->conn_conf.isc_iser)
+ idc->idc_iser = 1;
+ idc->idc_domain = to_ai->ai_family;
+ idc->idc_socktype = to_ai->ai_socktype;
+ idc->idc_protocol = to_ai->ai_protocol;
+ if (from_ai != NULL) {
+ idc->idc_from_addr = from_ai->ai_addr;
+ idc->idc_from_addrlen = from_ai->ai_addrlen;
+ }
+ idc->idc_to_addr = to_ai->ai_addr;
+ idc->idc_to_addrlen = to_ai->ai_addrlen;
+
+ log_debugx("connecting to %s using ICL kernel proxy", to_addr);
+ error = ioctl(iscsi_fd, ISCSIDCONNECT, idc);
+ if (error != 0) {
+ fail(conn, strerror(errno));
+ log_err(1, "failed to connect to %s using ICL kernel proxy",
+ to_addr);
+ }
+
+#else /* !ICL_KERNEL_PROXY */
+
+ if (conn->conn_conf.isc_iser)
+ log_errx(1, "iscsid(8) compiled without ICL_KERNEL_PROXY "
+ "does not support iSER");
+
+ conn->conn_socket = socket(to_ai->ai_family, to_ai->ai_socktype,
+ to_ai->ai_protocol);
+ if (conn->conn_socket < 0)
+ log_err(1, "failed to create socket for %s", from_addr);
+ if (from_ai != NULL) {
+ error = bind(conn->conn_socket, from_ai->ai_addr,
+ from_ai->ai_addrlen);
+ if (error != 0)
+ log_err(1, "failed to bind to %s", from_addr);
+ }
+ log_debugx("connecting to %s", to_addr);
+ error = connect(conn->conn_socket, to_ai->ai_addr, to_ai->ai_addrlen);
+ if (error != 0) {
+ fail(conn, strerror(errno));
+ log_err(1, "failed to connect to %s", to_addr);
+ }
+
+#endif /* !ICL_KERNEL_PROXY */
+
+ return (conn);
+}
+
+static void
+handoff(struct connection *conn)
+{
+ struct iscsi_daemon_handoff *idh;
+ int error;
+
+ log_debugx("handing off connection to the kernel");
+
+ idh = calloc(1, sizeof(*idh));
+ if (idh == NULL)
+ log_err(1, "calloc");
+ idh->idh_session_id = conn->conn_session_id;
+#ifndef ICL_KERNEL_PROXY
+ idh->idh_socket = conn->conn_socket;
+#endif
+ strlcpy(idh->idh_target_alias, conn->conn_target_alias,
+ sizeof(idh->idh_target_alias));
+ memcpy(idh->idh_isid, conn->conn_isid, sizeof(idh->idh_isid));
+ idh->idh_statsn = conn->conn_statsn;
+ idh->idh_header_digest = conn->conn_header_digest;
+ idh->idh_data_digest = conn->conn_data_digest;
+ idh->idh_initial_r2t = conn->conn_initial_r2t;
+ idh->idh_immediate_data = conn->conn_immediate_data;
+ idh->idh_max_data_segment_length = conn->conn_max_data_segment_length;
+ idh->idh_max_burst_length = conn->conn_max_burst_length;
+ idh->idh_first_burst_length = conn->conn_first_burst_length;
+
+ error = ioctl(conn->conn_iscsi_fd, ISCSIDHANDOFF, idh);
+ if (error != 0)
+ log_err(1, "ISCSIDHANDOFF");
+}
+
+void
+fail(const struct connection *conn, const char *reason)
+{
+ struct iscsi_daemon_fail *idf;
+ int error;
+
+ idf = calloc(1, sizeof(*idf));
+ if (idf == NULL)
+ log_err(1, "calloc");
+
+ idf->idf_session_id = conn->conn_session_id;
+ strlcpy(idf->idf_reason, reason, sizeof(idf->idf_reason));
+
+ error = ioctl(conn->conn_iscsi_fd, ISCSIDFAIL, idf);
+ if (error != 0)
+ log_err(1, "ISCSIDFAIL");
+}
+
+/*
+ * XXX: I CANT INTO LATIN
+ */
+static void
+capsicate(struct connection *conn)
+{
+ int error;
+ cap_rights_t rights;
+#ifdef ICL_KERNEL_PROXY
+ const unsigned long cmds[] = { ISCSIDCONNECT, ISCSIDSEND, ISCSIDRECEIVE,
+ ISCSIDHANDOFF, ISCSIDFAIL, ISCSISADD, ISCSISREMOVE };
+#else
+ const unsigned long cmds[] = { ISCSIDHANDOFF, ISCSIDFAIL, ISCSISADD,
+ ISCSISREMOVE };
+#endif
+
+ cap_rights_init(&rights, CAP_IOCTL);
+ error = cap_rights_limit(conn->conn_iscsi_fd, &rights);
+ if (error != 0 && errno != ENOSYS)
+ log_err(1, "cap_rights_limit");
+
+ error = cap_ioctls_limit(conn->conn_iscsi_fd, cmds,
+ sizeof(cmds) / sizeof(cmds[0]));
+ if (error != 0 && errno != ENOSYS)
+ log_err(1, "cap_ioctls_limit");
+
+ error = cap_enter();
+ if (error != 0 && errno != ENOSYS)
+ log_err(1, "cap_enter");
+
+ if (cap_sandboxed())
+ log_debugx("Capsicum capability mode enabled");
+ else
+ log_warnx("Capsicum capability mode not supported");
+}
+
+bool
+timed_out(void)
+{
+
+ return (sigalrm_received);
+}
+
+static void
+sigalrm_handler(int dummy __unused)
+{
+ /*
+ * It would be easiest to just log an error and exit. We can't
+ * do this, though, because log_errx() is not signal safe, since
+ * it calls syslog(3). Instead, set a flag checked by pdu_send()
+ * and pdu_receive(), to call log_errx() there. Should they fail
+ * to notice, we'll exit here one second later.
+ */
+ if (sigalrm_received) {
+ /*
+ * Oh well. Just give up and quit.
+ */
+ _exit(2);
+ }
+
+ sigalrm_received = true;
+}
+
+static void
+set_timeout(int timeout)
+{
+ struct sigaction sa;
+ struct itimerval itv;
+ int error;
+
+ if (timeout <= 0) {
+ log_debugx("session timeout disabled");
+ return;
+ }
+
+ bzero(&sa, sizeof(sa));
+ sa.sa_handler = sigalrm_handler;
+ sigfillset(&sa.sa_mask);
+ error = sigaction(SIGALRM, &sa, NULL);
+ if (error != 0)
+ log_err(1, "sigaction");
+
+ /*
+ * First SIGALRM will arive after conf_timeout seconds.
+ * If we do nothing, another one will arrive a second later.
+ */
+ bzero(&itv, sizeof(itv));
+ itv.it_interval.tv_sec = 1;
+ itv.it_value.tv_sec = timeout;
+
+ log_debugx("setting session timeout to %d seconds",
+ timeout);
+ error = setitimer(ITIMER_REAL, &itv, NULL);
+ if (error != 0)
+ log_err(1, "setitimer");
+}
+
+static void
+handle_request(int iscsi_fd, struct iscsi_daemon_request *request, int timeout)
+{
+ struct connection *conn;
+
+ log_set_peer_addr(request->idr_conf.isc_target_addr);
+ if (request->idr_conf.isc_target[0] != '\0') {
+ log_set_peer_name(request->idr_conf.isc_target);
+ setproctitle("%s (%s)", request->idr_conf.isc_target_addr, request->idr_conf.isc_target);
+ } else {
+ setproctitle("%s", request->idr_conf.isc_target_addr);
+ }
+
+ conn = connection_new(request->idr_session_id, &request->idr_conf, iscsi_fd);
+ set_timeout(timeout);
+ capsicate(conn);
+ login(conn);
+ if (conn->conn_conf.isc_discovery != 0)
+ discovery(conn);
+ else
+ handoff(conn);
+
+ log_debugx("nothing more to do; exiting");
+ exit (0);
+}
+
+static int
+wait_for_children(bool block)
+{
+ pid_t pid;
+ int status;
+ int num = 0;
+
+ for (;;) {
+ /*
+ * If "block" is true, wait for at least one process.
+ */
+ if (block && num == 0)
+ pid = wait4(-1, &status, 0, NULL);
+ else
+ pid = wait4(-1, &status, WNOHANG, NULL);
+ if (pid <= 0)
+ break;
+ if (WIFSIGNALED(status)) {
+ log_warnx("child process %d terminated with signal %d",
+ pid, WTERMSIG(status));
+ } else if (WEXITSTATUS(status) != 0) {
+ log_warnx("child process %d terminated with exit status %d",
+ pid, WEXITSTATUS(status));
+ } else {
+ log_debugx("child process %d terminated gracefully", pid);
+ }
+ num++;
+ }
+
+ return (num);
+}
+
+int
+main(int argc, char **argv)
+{
+ int ch, debug = 0, error, iscsi_fd, maxproc = 30, retval, saved_errno,
+ timeout = 60;
+ bool dont_daemonize = false;
+ struct pidfh *pidfh;
+ pid_t pid, otherpid;
+ const char *pidfile_path = DEFAULT_PIDFILE;
+ struct iscsi_daemon_request *request;
+
+ while ((ch = getopt(argc, argv, "P:dl:m:t:")) != -1) {
+ switch (ch) {
+ case 'P':
+ pidfile_path = optarg;
+ break;
+ case 'd':
+ dont_daemonize = true;
+ debug++;
+ break;
+ case 'l':
+ debug = atoi(optarg);
+ break;
+ case 'm':
+ maxproc = atoi(optarg);
+ break;
+ case 't':
+ timeout = atoi(optarg);
+ break;
+ case '?':
+ default:
+ usage();
+ }
+ }
+ argc -= optind;
+ if (argc != 0)
+ usage();
+
+ log_init(debug);
+
+ pidfh = pidfile_open(pidfile_path, 0600, &otherpid);
+ if (pidfh == NULL) {
+ if (errno == EEXIST)
+ log_errx(1, "daemon already running, pid: %jd.",
+ (intmax_t)otherpid);
+ log_err(1, "cannot open or create pidfile \"%s\"",
+ pidfile_path);
+ }
+
+ iscsi_fd = open(ISCSI_PATH, O_RDWR);
+ if (iscsi_fd < 0) {
+ saved_errno = errno;
+ retval = kldload("iscsi");
+ if (retval != -1)
+ iscsi_fd = open(ISCSI_PATH, O_RDWR);
+ else
+ errno = saved_errno;
+ }
+ if (iscsi_fd < 0)
+ log_err(1, "failed to open %s", ISCSI_PATH);
+
+ if (dont_daemonize == false) {
+ if (daemon(0, 0) == -1) {
+ log_warn("cannot daemonize");
+ pidfile_remove(pidfh);
+ exit(1);
+ }
+ }
+
+ pidfile_write(pidfh);
+
+ for (;;) {
+ log_debugx("waiting for request from the kernel");
+
+ request = calloc(1, sizeof(*request));
+ if (request == NULL)
+ log_err(1, "calloc");
+
+ error = ioctl(iscsi_fd, ISCSIDWAIT, request);
+ if (error != 0) {
+ if (errno == EINTR) {
+ nchildren -= wait_for_children(false);
+ assert(nchildren >= 0);
+ continue;
+ }
+
+ log_err(1, "ISCSIDWAIT");
+ }
+
+ if (dont_daemonize) {
+ log_debugx("not forking due to -d flag; "
+ "will exit after servicing a single request");
+ } else {
+ nchildren -= wait_for_children(false);
+ assert(nchildren >= 0);
+
+ while (maxproc > 0 && nchildren >= maxproc) {
+ log_debugx("maxproc limit of %d child processes hit; "
+ "waiting for child process to exit", maxproc);
+ nchildren -= wait_for_children(true);
+ assert(nchildren >= 0);
+ }
+ log_debugx("incoming connection; forking child process #%d",
+ nchildren);
+ nchildren++;
+
+ pid = fork();
+ if (pid < 0)
+ log_err(1, "fork");
+ if (pid > 0)
+ continue;
+ }
+
+ pidfile_close(pidfh);
+ handle_request(iscsi_fd, request, timeout);
+ }
+
+ return (0);
+}
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