src/ipc.c

/*
 * Copyright (c) 2005 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_APACHE_LICENSE_HEADER_START@
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * @APPLE_APACHE_LICENSE_HEADER_END@
 */

#include "config.h"
#include "ipc.h"

#include <sys/socket.h>
#include <sys/types.h>
#include <sys/queue.h>
#include <sys/event.h>
#include <sys/stat.h>
#include <sys/ucred.h>
#include <sys/fcntl.h>
#include <sys/un.h>
#include <sys/wait.h>
#include <sys/sysctl.h>
#include <sys/sockio.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <sys/ioctl.h>
#include <unistd.h>
#include <signal.h>
#include <errno.h>
#include <libgen.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <stdbool.h>
#include <paths.h>
#include <string.h>
#include <assumes.h>

#include "launch.h"
#include "launch_priv.h"
#include "launchd.h"
#include "runtime.h"
#include "core.h"

extern char **environ;

static LIST_HEAD(, conncb) connections;

static launch_data_t adjust_rlimits(launch_data_t in);

static void ipc_readmsg2(launch_data_t data, const char *cmd, void *context);
static void ipc_readmsg(launch_data_t msg, void *context);

static void ipc_listen_callback(void *obj __attribute__((unused)), struct kevent *kev);

static kq_callback kqipc_listen_callback = ipc_listen_callback;

static pid_t ipc_self = 0;

char *sockpath = NULL;
static char *sockdir = NULL;

static bool ipc_inited = false;

static void
ipc_clean_up(void)
{
	if (ipc_self != getpid()) {
		return;
	}

	if (-1 == unlink(sockpath)) {
		launchd_syslog(LOG_WARNING, "unlink(\"%s\"): %s", sockpath, strerror(errno));
	} else if (-1 == rmdir(sockdir)) {
		launchd_syslog(LOG_WARNING, "rmdir(\"%s\"): %s", sockdir, strerror(errno));
	}
}

void
ipc_server_init(void)
{
	struct sockaddr_un sun;
	mode_t oldmask;
	int r, fd = -1;
	char ourdir[1024];

	if (ipc_inited) {
		return;
	}

	memset(&sun, 0, sizeof(sun));
	sun.sun_family = AF_UNIX;

	if (pid1_magic) {
		strcpy(ourdir, LAUNCHD_SOCK_PREFIX);
		strncpy(sun.sun_path, LAUNCHD_SOCK_PREFIX "/sock", sizeof(sun.sun_path));

		unlink(ourdir);
		if (mkdir(ourdir, S_IRWXU) == -1) {
			if (errno == EROFS) {
				goto out_bad;
			} else if (errno == EEXIST) {
				struct stat sb;
				stat(ourdir, &sb);
				if (!S_ISDIR(sb.st_mode)) {
					errno = EEXIST;
					launchd_syslog(LOG_ERR, "mkdir(\"%s\"): %s", LAUNCHD_SOCK_PREFIX, strerror(errno));
					goto out_bad;
				}
			} else {
				launchd_syslog(LOG_ERR, "mkdir(\"%s\"): %s", ourdir, strerror(errno));
				goto out_bad;
			}
		}
	} else {
		snprintf(ourdir, sizeof(ourdir), _PATH_TMP "launchd-%u.XXXXXX", getpid());
		if (mkdtemp(ourdir) == NULL) {
			launchd_syslog(LOG_ERR, "Could not create critical directory \"%s\": %s", ourdir, strerror(errno));
			goto out_bad;
		}
		snprintf(sun.sun_path, sizeof(sun.sun_path), "%s/sock", ourdir);
	}

	if (unlink(sun.sun_path) == -1 && errno != ENOENT) {
		if (errno != EROFS) {
			launchd_syslog(LOG_ERR, "unlink(\"thesocket\"): %s", strerror(errno));
		}
		goto out_bad;
	}

	if (posix_assumes_zero(fd = _fd(socket(AF_UNIX, SOCK_STREAM, 0))) == -1) {
		goto out_bad;
	}

	oldmask = umask(S_IRWXG|S_IRWXO);
	r = bind(fd, (struct sockaddr *)&sun, sizeof(sun));
	umask(oldmask);

	if (r == -1) {
		if (errno != EROFS) {
			launchd_syslog(LOG_ERR, "bind(\"thesocket\"): %s", strerror(errno));
		}
		goto out_bad;
	}

	if (listen(fd, SOMAXCONN) == -1) {
		launchd_syslog(LOG_ERR, "listen(\"thesocket\"): %s", strerror(errno));
		goto out_bad;
	}

	if (kevent_mod(fd, EVFILT_READ, EV_ADD, 0, 0, &kqipc_listen_callback) == -1) {
		launchd_syslog(LOG_ERR, "kevent_mod(\"thesocket\", EVFILT_READ): %s", strerror(errno));
		goto out_bad;
	}

	ipc_inited = true;

	sockdir = strdup(ourdir);
	sockpath = strdup(sun.sun_path);
	ipc_self = getpid();
	atexit(ipc_clean_up);

out_bad:
	if (!ipc_inited && fd != -1) {
		(void)runtime_close(fd);
	}
}

void
ipc_open(int fd, job_t j)
{
	struct conncb *c = calloc(1, sizeof(struct conncb));

	fcntl(fd, F_SETFL, O_NONBLOCK);

	c->kqconn_callback = ipc_callback;
	if (j) {
		c->conn = launchd_fdopen(-1, fd);
	} else {
		c->conn = launchd_fdopen(fd, -1);
	}

	c->j = j;
	LIST_INSERT_HEAD(&connections, c, sle);
	kevent_mod(fd, EVFILT_READ, EV_ADD, 0, 0, &c->kqconn_callback);
}

void
ipc_listen_callback(void *obj __attribute__((unused)), struct kevent *kev)
{
	struct sockaddr_un sun;
	socklen_t sl = sizeof(sun);
	int cfd;

	if ((cfd = _fd(accept(kev->ident, (struct sockaddr *)&sun, &sl))) == -1) {
		return;
	}

	ipc_open(cfd, NULL);
}

void
ipc_callback(void *obj, struct kevent *kev)
{
	struct conncb *c = obj;
	int r;

	if (kev->filter == EVFILT_READ) {
		if (launchd_msg_recv(c->conn, ipc_readmsg, c) == -1 && errno != EAGAIN) {
			if (errno != ECONNRESET) {
				launchd_syslog(LOG_DEBUG, "%s(): recv: %s", __func__, strerror(errno));
			}
			ipc_close(c);
		}
	} else if (kev->filter == EVFILT_WRITE) {
		r = launchd_msg_send(c->conn, NULL);
		if (r == -1) {
			if (errno != EAGAIN) {
				launchd_syslog(LOG_DEBUG, "%s(): send: %s", __func__, strerror(errno));
				ipc_close(c);
			}
		} else if (r == 0) {
			kevent_mod(launchd_getfd(c->conn), EVFILT_WRITE, EV_DELETE, 0, 0, NULL);
		}
	} else {
		launchd_syslog(LOG_DEBUG, "%s(): unknown filter type!", __func__);
		ipc_close(c);
	}
}

static void
set_user_env(launch_data_t obj, const char *key, void *context __attribute__((unused)))
{
	const char *v = launch_data_get_string(obj);
	if (v) {
		setenv(key, v, 1);
	} else {
		launchd_syslog(LOG_WARNING, "Attempt to set NULL environment variable: %s (type = %d)", key, launch_data_get_type(obj));
	}
}

void
ipc_close_all_with_job(job_t j)
{
	struct conncb *ci, *cin;

	LIST_FOREACH_SAFE(ci, &connections, sle, cin) {
		if (ci->j == j) {
			ipc_close(ci);
		}
	}
}

void
ipc_close_fds(launch_data_t o)
{
	size_t i;

	switch (launch_data_get_type(o)) {
	case LAUNCH_DATA_DICTIONARY:
		launch_data_dict_iterate(o, (void (*)(launch_data_t, const char *, void *))ipc_close_fds, NULL);
		break;
	case LAUNCH_DATA_ARRAY:
		for (i = 0; i < launch_data_array_get_count(o); i++)
			ipc_close_fds(launch_data_array_get_index(o, i));
		break;
	case LAUNCH_DATA_FD:
		if (launch_data_get_fd(o) != -1) {
			(void)runtime_close(launch_data_get_fd(o));
		}
		break;
	default:
		break;
	}
}

void
ipc_revoke_fds(launch_data_t o)
{
	size_t i;

	switch (launch_data_get_type(o)) {
	case LAUNCH_DATA_DICTIONARY:
		launch_data_dict_iterate(o, (void (*)(launch_data_t, const char *, void *))ipc_revoke_fds, NULL);
		break;
	case LAUNCH_DATA_ARRAY:
		for (i = 0; i < launch_data_array_get_count(o); i++)
			ipc_revoke_fds(launch_data_array_get_index(o, i));
		break;
	case LAUNCH_DATA_FD:
		launch_data_set_fd(o, -1);
		break;
	default:
		break;
	}
}

struct readmsg_context {
	struct conncb *c;
	launch_data_t resp;
};

void
ipc_readmsg(launch_data_t msg, void *context)
{
	struct readmsg_context rmc = { context, NULL };

	if (LAUNCH_DATA_DICTIONARY == launch_data_get_type(msg)) {
		launch_data_dict_iterate(msg, ipc_readmsg2, &rmc);
	} else if (LAUNCH_DATA_STRING == launch_data_get_type(msg)) {
		ipc_readmsg2(NULL, launch_data_get_string(msg), &rmc);
	} else {
		rmc.resp = launch_data_new_errno(EINVAL);
	}

	if (NULL == rmc.resp) {
		rmc.resp = launch_data_new_errno(ENOSYS);
	}

	ipc_close_fds(msg);

	if (launchd_msg_send(rmc.c->conn, rmc.resp) == -1) {
		if (errno == EAGAIN) {
			kevent_mod(launchd_getfd(rmc.c->conn), EVFILT_WRITE, EV_ADD, 0, 0, &rmc.c->kqconn_callback);
		} else {
			launchd_syslog(LOG_DEBUG, "launchd_msg_send() == -1: %s", strerror(errno));
			ipc_close(rmc.c);
		}
	}
	launch_data_free(rmc.resp);
}

void
ipc_readmsg2(launch_data_t data, const char *cmd, void *context)
{
	struct readmsg_context *rmc = context;
	launch_data_t resp = NULL;
	job_t j;

	if (rmc->resp) {
		return;
	}

	/* Do not allow commands other than check-in to come over the trusted socket
	 * on the Desktop. On Embedded, allow all commands over the trusted socket
	 * if the job has the God Mode key set.
	 */
#if TARGET_OS_EMBEDDED
	bool allow_privileged_ops = (!rmc->c->j || job_is_god(rmc->c->j));
#else
	bool allow_privileged_ops = !rmc->c->j;
#endif

	if (rmc->c->j && strcmp(cmd, LAUNCH_KEY_CHECKIN) == 0) {
		resp = job_export(rmc->c->j);
		job_checkin(rmc->c->j);
	} else if (allow_privileged_ops) {
#if TARGET_OS_EMBEDDED
		launchd_embedded_handofgod = rmc->c->j && job_is_god(rmc->c->j);
#endif
		if (data == NULL) {
			if (!strcmp(cmd, LAUNCH_KEY_SHUTDOWN)) {
				launchd_shutdown();
				resp = launch_data_new_errno(0);
			} else if (!strcmp(cmd, LAUNCH_KEY_GETJOBS)) {
				resp = job_export_all();
				ipc_revoke_fds(resp);
			} else if (!strcmp(cmd, LAUNCH_KEY_GETRESOURCELIMITS)) {
				resp = adjust_rlimits(NULL);
			} else if (!strcmp(cmd, LAUNCH_KEY_GETRUSAGESELF)) {
				struct rusage rusage;
				getrusage(RUSAGE_SELF, &rusage);
				resp = launch_data_new_opaque(&rusage, sizeof(rusage));
			} else if (!strcmp(cmd, LAUNCH_KEY_GETRUSAGECHILDREN)) {
				struct rusage rusage;
				getrusage(RUSAGE_CHILDREN, &rusage);
				resp = launch_data_new_opaque(&rusage, sizeof(rusage));
			}
		} else {
			if (!strcmp(cmd, LAUNCH_KEY_STARTJOB)) {
				if ((j = job_find(NULL, launch_data_get_string(data))) != NULL) {
					errno = job_dispatch(j, true) ? 0 : errno;
				}
				resp = launch_data_new_errno(errno);
			} else if (!strcmp(cmd, LAUNCH_KEY_STOPJOB)) {
				if ((j = job_find(NULL, launch_data_get_string(data))) != NULL) {
					errno = 0;
					job_stop(j);
				}
				resp = launch_data_new_errno(errno);
			} else if (!strcmp(cmd, LAUNCH_KEY_REMOVEJOB)) {
				if ((j = job_find(NULL, launch_data_get_string(data))) != NULL) {
					errno = 0;
					job_remove(j);
				}
				resp = launch_data_new_errno(errno);
			} else if (!strcmp(cmd, LAUNCH_KEY_SUBMITJOB)) {
				if (launch_data_get_type(data) == LAUNCH_DATA_ARRAY) {
					resp = job_import_bulk(data);
				} else {
					if (job_import(data)) {
						errno = 0;
					}
					resp = launch_data_new_errno(errno);
				}
			} else if (!strcmp(cmd, LAUNCH_KEY_UNSETUSERENVIRONMENT)) {
				unsetenv(launch_data_get_string(data));
				resp = launch_data_new_errno(0);
			} else if (!strcmp(cmd, LAUNCH_KEY_SETUSERENVIRONMENT)) {
				launch_data_dict_iterate(data, set_user_env, NULL);
				resp = launch_data_new_errno(0);
			} else if (!strcmp(cmd, LAUNCH_KEY_SETRESOURCELIMITS)) {
				resp = adjust_rlimits(data);
			} else if (!strcmp(cmd, LAUNCH_KEY_GETJOB)) {
				if ((j = job_find(NULL, launch_data_get_string(data))) == NULL) {
					resp = launch_data_new_errno(errno);
				} else {
					resp = job_export(j);
					ipc_revoke_fds(resp);
				}
			} else if (!strcmp(cmd, LAUNCH_KEY_SETPRIORITYLIST)) {
#if TARGET_OS_EMBEDDED
				resp = launch_data_new_errno(launchd_set_jetsam_priorities(data));
#else
				resp = launch_data_new_errno(ENOTSUP);
#endif
			}
		}
#if TARGET_OS_EMBEDDED
		launchd_embedded_handofgod = false;
#endif
	} else {
		resp = launch_data_new_errno(EACCES);
	}

	rmc->resp = resp;
}

static int
close_abi_fixup(int fd)
{
	return runtime_close(fd);
}

void
ipc_close(struct conncb *c)
{
	LIST_REMOVE(c, sle);
	launchd_close(c->conn, close_abi_fixup);
	free(c);
}

launch_data_t
adjust_rlimits(launch_data_t in)
{
	/* If I never have to deal with this rlimit nonsense again, I'll be a very
	 * happy man.
	 */
	struct rlimit l[RLIM_NLIMITS];
	struct rlimit *ltmp;
	size_t i,ltmpsz;

	for (i = 0; i < RLIM_NLIMITS; i++) {
		(void)posix_assumes_zero(getrlimit(i, l + i));
	}

	if (in) {
		ltmp = launch_data_get_opaque(in);
		ltmpsz = launch_data_get_opaque_size(in);

		if (ltmpsz > sizeof(l)) {
			launchd_syslog(LOG_WARNING, "Too much rlimit data sent!");
			ltmpsz = sizeof(l);
		}

		for (i = 0; i < (ltmpsz / sizeof(struct rlimit)); i++) {
			if (ltmp[i].rlim_cur == l[i].rlim_cur && ltmp[i].rlim_max == l[i].rlim_max) {
				continue;
			}

			if (/* XXX readcfg_pid && */ pid1_magic && (i == RLIMIT_NOFILE || i == RLIMIT_NPROC)) {
				int gmib[] = { CTL_KERN, KERN_MAXPROC };
				int pmib[] = { CTL_KERN, KERN_MAXPROCPERUID };
				const char *gstr = "kern.maxproc";
				const char *pstr = "kern.maxprocperuid";
				int gval = ltmp[i].rlim_max;
				int pval = ltmp[i].rlim_cur;
				switch (i) {
				case RLIMIT_NOFILE:
					gmib[1] = KERN_MAXFILES;
					pmib[1] = KERN_MAXFILESPERPROC;
					gstr = "kern.maxfiles";
					pstr = "kern.maxfilesperproc";
					break;
				default:
					break;
				}

				if (gval > 0) {
					(void)posix_assumes_zero(sysctl(gmib, 2, NULL, NULL, &gval, sizeof(gval)));
				} else {
					launchd_syslog(LOG_WARNING, "sysctl(\"%s\"): can't be zero", gstr);
				}
				if (pval > 0) {
					(void)posix_assumes_zero(sysctl(pmib, 2, NULL, NULL, &pval, sizeof(pval)));
				} else {
					launchd_syslog(LOG_WARNING, "sysctl(\"%s\"): can't be zero", pstr);
				}
			}
			(void)posix_assumes_zero(setrlimit(i, ltmp + i));
			/* the kernel may have clamped the values we gave it */
			(void)posix_assumes_zero(getrlimit(i, l + i));
		}
	}

	return launch_data_new_opaque(l, sizeof(struct rlimit) * RLIM_NLIMITS);
}
Commit	Line	Data
	1	/*
	2	* Copyright (c) 2005 Apple Computer, Inc. All rights reserved.
	3	*
	4	* @APPLE_APACHE_LICENSE_HEADER_START@
	5	*
	6	* Licensed under the Apache License, Version 2.0 (the "License");
	7	* you may not use this file except in compliance with the License.
	8	* You may obtain a copy of the License at
	9	*
	10	* http://www.apache.org/licenses/LICENSE-2.0
	11	*
	12	* Unless required by applicable law or agreed to in writing, software
	13	* distributed under the License is distributed on an "AS IS" BASIS,
	14	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	15	* See the License for the specific language governing permissions and
	16	* limitations under the License.
	17	*
	18	* @APPLE_APACHE_LICENSE_HEADER_END@
	19	*/
	20
	21	#include "config.h"
	22	#include "ipc.h"
	23
	24	#include <sys/socket.h>
	25	#include <sys/types.h>
	26	#include <sys/queue.h>
	27	#include <sys/event.h>
	28	#include <sys/stat.h>
	29	#include <sys/ucred.h>
	30	#include <sys/fcntl.h>
	31	#include <sys/un.h>
	32	#include <sys/wait.h>
	33	#include <sys/sysctl.h>
	34	#include <sys/sockio.h>
	35	#include <sys/time.h>
	36	#include <sys/resource.h>
	37	#include <sys/ioctl.h>
	38	#include <unistd.h>
	39	#include <signal.h>
	40	#include <errno.h>
	41	#include <libgen.h>
	42	#include <stdio.h>
	43	#include <stdlib.h>
	44	#include <stdarg.h>
	45	#include <stdbool.h>
	46	#include <paths.h>
	47	#include <string.h>
	48	#include <assumes.h>
	49
	50	#include "launch.h"
	51	#include "launch_priv.h"
	52	#include "launchd.h"
	53	#include "runtime.h"
	54	#include "core.h"
	55
	56	extern char **environ;
	57
	58	static LIST_HEAD(, conncb) connections;
	59
	60	static launch_data_t adjust_rlimits(launch_data_t in);
	61
	62	static void ipc_readmsg2(launch_data_t data, const char cmd, void context);
	63	static void ipc_readmsg(launch_data_t msg, void *context);
	64
	65	static void ipc_listen_callback(void obj __attribute__((unused)), struct kevent kev);
	66
	67	static kq_callback kqipc_listen_callback = ipc_listen_callback;
	68
	69	static pid_t ipc_self = 0;
	70
	71	char *sockpath = NULL;
	72	static char *sockdir = NULL;
	73
	74	static bool ipc_inited = false;
	75
	76	static void
	77	ipc_clean_up(void)
	78	{
	79	if (ipc_self != getpid()) {
	80	return;
	81	}
	82
	83	if (-1 == unlink(sockpath)) {
	84	launchd_syslog(LOG_WARNING, "unlink(\"%s\"): %s", sockpath, strerror(errno));
	85	} else if (-1 == rmdir(sockdir)) {
	86	launchd_syslog(LOG_WARNING, "rmdir(\"%s\"): %s", sockdir, strerror(errno));
	87	}
	88	}
	89
	90	void
	91	ipc_server_init(void)
	92	{
	93	struct sockaddr_un sun;
	94	mode_t oldmask;
	95	int r, fd = -1;
	96	char ourdir[1024];
	97
	98	if (ipc_inited) {
	99	return;
	100	}
	101
	102	memset(&sun, 0, sizeof(sun));
	103	sun.sun_family = AF_UNIX;
	104
	105	if (pid1_magic) {
	106	strcpy(ourdir, LAUNCHD_SOCK_PREFIX);
	107	strncpy(sun.sun_path, LAUNCHD_SOCK_PREFIX "/sock", sizeof(sun.sun_path));
	108
	109	unlink(ourdir);
	110	if (mkdir(ourdir, S_IRWXU) == -1) {
	111	if (errno == EROFS) {
	112	goto out_bad;
	113	} else if (errno == EEXIST) {
	114	struct stat sb;
	115	stat(ourdir, &sb);
	116	if (!S_ISDIR(sb.st_mode)) {
	117	errno = EEXIST;
	118	launchd_syslog(LOG_ERR, "mkdir(\"%s\"): %s", LAUNCHD_SOCK_PREFIX, strerror(errno));
	119	goto out_bad;
	120	}
	121	} else {
	122	launchd_syslog(LOG_ERR, "mkdir(\"%s\"): %s", ourdir, strerror(errno));
	123	goto out_bad;
	124	}
	125	}
	126	} else {
	127	snprintf(ourdir, sizeof(ourdir), _PATH_TMP "launchd-%u.XXXXXX", getpid());
	128	if (mkdtemp(ourdir) == NULL) {
	129	launchd_syslog(LOG_ERR, "Could not create critical directory \"%s\": %s", ourdir, strerror(errno));
	130	goto out_bad;
	131	}
	132	snprintf(sun.sun_path, sizeof(sun.sun_path), "%s/sock", ourdir);
	133	}
	134
	135	if (unlink(sun.sun_path) == -1 && errno != ENOENT) {
	136	if (errno != EROFS) {
	137	launchd_syslog(LOG_ERR, "unlink(\"thesocket\"): %s", strerror(errno));
	138	}
	139	goto out_bad;
	140	}
	141
	142	if (posix_assumes_zero(fd = _fd(socket(AF_UNIX, SOCK_STREAM, 0))) == -1) {
	143	goto out_bad;
	144	}
	145
	146	oldmask = umask(S_IRWXG\|S_IRWXO);
	147	r = bind(fd, (struct sockaddr *)&sun, sizeof(sun));
	148	umask(oldmask);
	149
	150	if (r == -1) {
	151	if (errno != EROFS) {
	152	launchd_syslog(LOG_ERR, "bind(\"thesocket\"): %s", strerror(errno));
	153	}
	154	goto out_bad;
	155	}
	156
	157	if (listen(fd, SOMAXCONN) == -1) {
	158	launchd_syslog(LOG_ERR, "listen(\"thesocket\"): %s", strerror(errno));
	159	goto out_bad;
	160	}
	161
	162	if (kevent_mod(fd, EVFILT_READ, EV_ADD, 0, 0, &kqipc_listen_callback) == -1) {
	163	launchd_syslog(LOG_ERR, "kevent_mod(\"thesocket\", EVFILT_READ): %s", strerror(errno));
	164	goto out_bad;
	165	}
	166
	167	ipc_inited = true;
	168
	169	sockdir = strdup(ourdir);
	170	sockpath = strdup(sun.sun_path);
	171	ipc_self = getpid();
	172	atexit(ipc_clean_up);
	173
	174	out_bad:
	175	if (!ipc_inited && fd != -1) {
	176	(void)runtime_close(fd);
	177	}
	178	}
	179
	180	void
	181	ipc_open(int fd, job_t j)
	182	{
	183	struct conncb *c = calloc(1, sizeof(struct conncb));
	184
	185	fcntl(fd, F_SETFL, O_NONBLOCK);
	186
	187	c->kqconn_callback = ipc_callback;
	188	if (j) {
	189	c->conn = launchd_fdopen(-1, fd);
	190	} else {
	191	c->conn = launchd_fdopen(fd, -1);
	192	}
	193
	194	c->j = j;
	195	LIST_INSERT_HEAD(&connections, c, sle);
	196	kevent_mod(fd, EVFILT_READ, EV_ADD, 0, 0, &c->kqconn_callback);
	197	}
	198
	199	void
	200	ipc_listen_callback(void obj __attribute__((unused)), struct kevent kev)
	201	{
	202	struct sockaddr_un sun;
	203	socklen_t sl = sizeof(sun);
	204	int cfd;
	205
	206	if ((cfd = _fd(accept(kev->ident, (struct sockaddr *)&sun, &sl))) == -1) {
	207	return;
	208	}
	209
	210	ipc_open(cfd, NULL);
	211	}
	212
	213	void
	214	ipc_callback(void obj, struct kevent kev)
	215	{
	216	struct conncb *c = obj;
	217	int r;
	218
	219	if (kev->filter == EVFILT_READ) {
	220	if (launchd_msg_recv(c->conn, ipc_readmsg, c) == -1 && errno != EAGAIN) {
	221	if (errno != ECONNRESET) {
	222	launchd_syslog(LOG_DEBUG, "%s(): recv: %s", __func__, strerror(errno));
	223	}
	224	ipc_close(c);
	225	}
	226	} else if (kev->filter == EVFILT_WRITE) {
	227	r = launchd_msg_send(c->conn, NULL);
	228	if (r == -1) {
	229	if (errno != EAGAIN) {
	230	launchd_syslog(LOG_DEBUG, "%s(): send: %s", __func__, strerror(errno));
	231	ipc_close(c);
	232	}
	233	} else if (r == 0) {
	234	kevent_mod(launchd_getfd(c->conn), EVFILT_WRITE, EV_DELETE, 0, 0, NULL);
	235	}
	236	} else {
	237	launchd_syslog(LOG_DEBUG, "%s(): unknown filter type!", __func__);
	238	ipc_close(c);
	239	}
	240	}
	241
	242	static void
	243	set_user_env(launch_data_t obj, const char key, void context __attribute__((unused)))
	244	{
	245	const char *v = launch_data_get_string(obj);
	246	if (v) {
	247	setenv(key, v, 1);
	248	} else {
	249	launchd_syslog(LOG_WARNING, "Attempt to set NULL environment variable: %s (type = %d)", key, launch_data_get_type(obj));
	250	}
	251	}
	252
	253	void
	254	ipc_close_all_with_job(job_t j)
	255	{
	256	struct conncb ci, cin;
	257
	258	LIST_FOREACH_SAFE(ci, &connections, sle, cin) {
	259	if (ci->j == j) {
	260	ipc_close(ci);
	261	}
	262	}
	263	}
	264
	265	void
	266	ipc_close_fds(launch_data_t o)
	267	{
	268	size_t i;
	269
	270	switch (launch_data_get_type(o)) {
	271	case LAUNCH_DATA_DICTIONARY:
	272	launch_data_dict_iterate(o, (void ()(launch_data_t, const char , void *))ipc_close_fds, NULL);
	273	break;
	274	case LAUNCH_DATA_ARRAY:
	275	for (i = 0; i < launch_data_array_get_count(o); i++)
	276	ipc_close_fds(launch_data_array_get_index(o, i));
	277	break;
	278	case LAUNCH_DATA_FD:
	279	if (launch_data_get_fd(o) != -1) {
	280	(void)runtime_close(launch_data_get_fd(o));
	281	}
	282	break;
	283	default:
	284	break;
	285	}
	286	}
	287
	288	void
	289	ipc_revoke_fds(launch_data_t o)
	290	{
	291	size_t i;
	292
	293	switch (launch_data_get_type(o)) {
	294	case LAUNCH_DATA_DICTIONARY:
	295	launch_data_dict_iterate(o, (void ()(launch_data_t, const char , void *))ipc_revoke_fds, NULL);
	296	break;
	297	case LAUNCH_DATA_ARRAY:
	298	for (i = 0; i < launch_data_array_get_count(o); i++)
	299	ipc_revoke_fds(launch_data_array_get_index(o, i));
	300	break;
	301	case LAUNCH_DATA_FD:
	302	launch_data_set_fd(o, -1);
	303	break;
	304	default:
	305	break;
	306	}
	307	}
	308
	309	struct readmsg_context {
	310	struct conncb *c;
	311	launch_data_t resp;
	312	};
	313
	314	void
	315	ipc_readmsg(launch_data_t msg, void *context)
	316	{
	317	struct readmsg_context rmc = { context, NULL };
	318
	319	if (LAUNCH_DATA_DICTIONARY == launch_data_get_type(msg)) {
	320	launch_data_dict_iterate(msg, ipc_readmsg2, &rmc);
	321	} else if (LAUNCH_DATA_STRING == launch_data_get_type(msg)) {
	322	ipc_readmsg2(NULL, launch_data_get_string(msg), &rmc);
	323	} else {
	324	rmc.resp = launch_data_new_errno(EINVAL);
	325	}
	326
	327	if (NULL == rmc.resp) {
	328	rmc.resp = launch_data_new_errno(ENOSYS);
	329	}
	330
	331	ipc_close_fds(msg);
	332
	333	if (launchd_msg_send(rmc.c->conn, rmc.resp) == -1) {
	334	if (errno == EAGAIN) {
	335	kevent_mod(launchd_getfd(rmc.c->conn), EVFILT_WRITE, EV_ADD, 0, 0, &rmc.c->kqconn_callback);
	336	} else {
	337	launchd_syslog(LOG_DEBUG, "launchd_msg_send() == -1: %s", strerror(errno));
	338	ipc_close(rmc.c);
	339	}
	340	}
	341	launch_data_free(rmc.resp);
	342	}
	343
	344	void
	345	ipc_readmsg2(launch_data_t data, const char cmd, void context)
	346	{
	347	struct readmsg_context *rmc = context;
	348	launch_data_t resp = NULL;
	349	job_t j;
	350
	351	if (rmc->resp) {
	352	return;
	353	}
	354
	355	/* Do not allow commands other than check-in to come over the trusted socket
	356	* on the Desktop. On Embedded, allow all commands over the trusted socket
	357	* if the job has the God Mode key set.
	358	*/
	359	#if TARGET_OS_EMBEDDED
	360	bool allow_privileged_ops = (!rmc->c->j \|\| job_is_god(rmc->c->j));
	361	#else
	362	bool allow_privileged_ops = !rmc->c->j;
	363	#endif
	364
	365	if (rmc->c->j && strcmp(cmd, LAUNCH_KEY_CHECKIN) == 0) {
	366	resp = job_export(rmc->c->j);
	367	job_checkin(rmc->c->j);
	368	} else if (allow_privileged_ops) {
	369	#if TARGET_OS_EMBEDDED
	370	launchd_embedded_handofgod = rmc->c->j && job_is_god(rmc->c->j);
	371	#endif
	372	if (data == NULL) {
	373	if (!strcmp(cmd, LAUNCH_KEY_SHUTDOWN)) {
	374	launchd_shutdown();
	375	resp = launch_data_new_errno(0);
	376	} else if (!strcmp(cmd, LAUNCH_KEY_GETJOBS)) {
	377	resp = job_export_all();
	378	ipc_revoke_fds(resp);
	379	} else if (!strcmp(cmd, LAUNCH_KEY_GETRESOURCELIMITS)) {
	380	resp = adjust_rlimits(NULL);
	381	} else if (!strcmp(cmd, LAUNCH_KEY_GETRUSAGESELF)) {
	382	struct rusage rusage;
	383	getrusage(RUSAGE_SELF, &rusage);
	384	resp = launch_data_new_opaque(&rusage, sizeof(rusage));
	385	} else if (!strcmp(cmd, LAUNCH_KEY_GETRUSAGECHILDREN)) {
	386	struct rusage rusage;
	387	getrusage(RUSAGE_CHILDREN, &rusage);
	388	resp = launch_data_new_opaque(&rusage, sizeof(rusage));
	389	}
	390	} else {
	391	if (!strcmp(cmd, LAUNCH_KEY_STARTJOB)) {
	392	if ((j = job_find(NULL, launch_data_get_string(data))) != NULL) {
	393	errno = job_dispatch(j, true) ? 0 : errno;
	394	}
	395	resp = launch_data_new_errno(errno);
	396	} else if (!strcmp(cmd, LAUNCH_KEY_STOPJOB)) {
	397	if ((j = job_find(NULL, launch_data_get_string(data))) != NULL) {
	398	errno = 0;
	399	job_stop(j);
	400	}
	401	resp = launch_data_new_errno(errno);
	402	} else if (!strcmp(cmd, LAUNCH_KEY_REMOVEJOB)) {
	403	if ((j = job_find(NULL, launch_data_get_string(data))) != NULL) {
	404	errno = 0;
	405	job_remove(j);
	406	}
	407	resp = launch_data_new_errno(errno);
	408	} else if (!strcmp(cmd, LAUNCH_KEY_SUBMITJOB)) {
	409	if (launch_data_get_type(data) == LAUNCH_DATA_ARRAY) {
	410	resp = job_import_bulk(data);
	411	} else {
	412	if (job_import(data)) {
	413	errno = 0;
	414	}
	415	resp = launch_data_new_errno(errno);
	416	}
	417	} else if (!strcmp(cmd, LAUNCH_KEY_UNSETUSERENVIRONMENT)) {
	418	unsetenv(launch_data_get_string(data));
	419	resp = launch_data_new_errno(0);
	420	} else if (!strcmp(cmd, LAUNCH_KEY_SETUSERENVIRONMENT)) {
	421	launch_data_dict_iterate(data, set_user_env, NULL);
	422	resp = launch_data_new_errno(0);
	423	} else if (!strcmp(cmd, LAUNCH_KEY_SETRESOURCELIMITS)) {
	424	resp = adjust_rlimits(data);
	425	} else if (!strcmp(cmd, LAUNCH_KEY_GETJOB)) {
	426	if ((j = job_find(NULL, launch_data_get_string(data))) == NULL) {
	427	resp = launch_data_new_errno(errno);
	428	} else {
	429	resp = job_export(j);
	430	ipc_revoke_fds(resp);
	431	}
	432	} else if (!strcmp(cmd, LAUNCH_KEY_SETPRIORITYLIST)) {
	433	#if TARGET_OS_EMBEDDED
	434	resp = launch_data_new_errno(launchd_set_jetsam_priorities(data));
	435	#else
	436	resp = launch_data_new_errno(ENOTSUP);
	437	#endif
	438	}
	439	}
	440	#if TARGET_OS_EMBEDDED
	441	launchd_embedded_handofgod = false;
	442	#endif
	443	} else {
	444	resp = launch_data_new_errno(EACCES);
	445	}
	446
	447	rmc->resp = resp;
	448	}
	449
	450	static int
	451	close_abi_fixup(int fd)
	452	{
	453	return runtime_close(fd);
	454	}
	455
	456	void
	457	ipc_close(struct conncb *c)
	458	{
	459	LIST_REMOVE(c, sle);
	460	launchd_close(c->conn, close_abi_fixup);
	461	free(c);
	462	}
	463
	464	launch_data_t
	465	adjust_rlimits(launch_data_t in)
	466	{
	467	/* If I never have to deal with this rlimit nonsense again, I'll be a very
	468	* happy man.
	469	*/
	470	struct rlimit l[RLIM_NLIMITS];
	471	struct rlimit *ltmp;
	472	size_t i,ltmpsz;
	473
	474	for (i = 0; i < RLIM_NLIMITS; i++) {
	475	(void)posix_assumes_zero(getrlimit(i, l + i));
	476	}
	477
	478	if (in) {
	479	ltmp = launch_data_get_opaque(in);
	480	ltmpsz = launch_data_get_opaque_size(in);
	481
	482	if (ltmpsz > sizeof(l)) {
	483	launchd_syslog(LOG_WARNING, "Too much rlimit data sent!");
	484	ltmpsz = sizeof(l);
	485	}
	486
	487	for (i = 0; i < (ltmpsz / sizeof(struct rlimit)); i++) {
	488	if (ltmp[i].rlim_cur == l[i].rlim_cur && ltmp[i].rlim_max == l[i].rlim_max) {
	489	continue;
	490	}
	491
	492	if (/* XXX readcfg_pid && */ pid1_magic && (i == RLIMIT_NOFILE \|\| i == RLIMIT_NPROC)) {
	493	int gmib[] = { CTL_KERN, KERN_MAXPROC };
	494	int pmib[] = { CTL_KERN, KERN_MAXPROCPERUID };
	495	const char *gstr = "kern.maxproc";
	496	const char *pstr = "kern.maxprocperuid";
	497	int gval = ltmp[i].rlim_max;
	498	int pval = ltmp[i].rlim_cur;
	499	switch (i) {
	500	case RLIMIT_NOFILE:
	501	gmib[1] = KERN_MAXFILES;
	502	pmib[1] = KERN_MAXFILESPERPROC;
	503	gstr = "kern.maxfiles";
	504	pstr = "kern.maxfilesperproc";
	505	break;
	506	default:
	507	break;
	508	}
	509
	510	if (gval > 0) {
	511	(void)posix_assumes_zero(sysctl(gmib, 2, NULL, NULL, &gval, sizeof(gval)));
	512	} else {
	513	launchd_syslog(LOG_WARNING, "sysctl(\"%s\"): can't be zero", gstr);
	514	}
	515	if (pval > 0) {
	516	(void)posix_assumes_zero(sysctl(pmib, 2, NULL, NULL, &pval, sizeof(pval)));
	517	} else {
	518	launchd_syslog(LOG_WARNING, "sysctl(\"%s\"): can't be zero", pstr);
	519	}
	520	}
	521	(void)posix_assumes_zero(setrlimit(i, ltmp + i));
	522	/* the kernel may have clamped the values we gave it */
	523	(void)posix_assumes_zero(getrlimit(i, l + i));
	524	}
	525	}
	526
	527	return launch_data_new_opaque(l, sizeof(struct rlimit) * RLIM_NLIMITS);
	528	}