launchd/src/launchproxy.c

   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 #include "config.h"
  21 #include <sys/types.h>
  22 #include <sys/select.h>
  23 #include <sys/event.h>
  24 #include <sys/socket.h>
  25 #include <sys/time.h>
  26 #include <stdio.h>
  27 #include <stdlib.h>
  28 #include <stdbool.h>
  29 #include <unistd.h>
  30 #include <string.h>
  31 #include <errno.h>
  32 #include <fcntl.h>
  33 #include <syslog.h>
  34 #include <libgen.h>
  35 #include <getopt.h>
  36 #include <signal.h>
  37 #include <netdb.h>
  38
  39 #if !TARGET_OS_EMBEDDED
  40 #include <bsm/audit.h>
  41 #include <bsm/audit_session.h>
  42 #endif
  43
  44 #include "launch.h"
  45
  46 static int kq = 0;
  47
  48 static void find_fds(launch_data_t o, const char *key __attribute__((unused)), void *context __attribute__((unused)))
  49 {
  50         struct kevent kev;
  51         size_t i;
  52         int fd;
  53
  54         switch (launch_data_get_type(o)) {
  55         case LAUNCH_DATA_FD:
  56                 fd = launch_data_get_fd(o);
  57                 if (-1 == fd)
  58                         break;
  59                 fcntl(fd, F_SETFD, 1);
  60                 EV_SET(&kev, fd, EVFILT_READ, EV_ADD, 0, 0, NULL);
  61                 if (kevent(kq, &kev, 1, NULL, 0, NULL) == -1)
  62                         syslog(LOG_DEBUG, "kevent(%d): %m", fd);
  63                 break;
  64         case LAUNCH_DATA_ARRAY:
  65                 for (i = 0; i < launch_data_array_get_count(o); i++)
  66                         find_fds(launch_data_array_get_index(o, i), NULL, NULL);
  67                 break;
  68         case LAUNCH_DATA_DICTIONARY:
  69                 launch_data_dict_iterate(o, find_fds, NULL);
  70                 break;
  71         default:
  72                 break;
  73         }
  74 }
  75
  76 int main(int argc __attribute__((unused)), char *argv[])
  77 {
  78         struct timespec timeout = { 10, 0 };
  79         struct sockaddr_storage ss;
  80         socklen_t slen = (socklen_t)sizeof ss;
  81         struct kevent kev;
  82         int r, ec = EXIT_FAILURE;
  83         launch_data_t tmp, resp, msg = launch_data_alloc(LAUNCH_DATA_STRING);
  84         const char *prog = argv[1];
  85         bool w = false, dupstdout = true, dupstderr = true;
  86
  87         launch_data_set_string(msg, LAUNCH_KEY_CHECKIN);
  88
  89         openlog(getprogname(), LOG_PERROR|LOG_PID|LOG_CONS, LOG_LAUNCHD);
  90
  91         kq = kqueue();
  92
  93         if ((resp = launch_msg(msg)) == NULL) {
  94                 syslog(LOG_ERR, "launch_msg(%s): %m", LAUNCH_KEY_CHECKIN);
  95                 goto out;
  96         }
  97
  98         launch_data_free(msg);
  99
 100         tmp = launch_data_dict_lookup(resp, LAUNCH_JOBKEY_SOCKETS);
 101         if (tmp) {
 102                 find_fds(tmp, NULL, NULL);
 103         } else {
 104                 syslog(LOG_ERR, "No FDs found to answer requests on!");
 105                 goto out;
 106         }
 107
 108         tmp = launch_data_dict_lookup(resp, LAUNCH_JOBKEY_TIMEOUT);
 109         if (tmp)
 110                 timeout.tv_sec = (int)launch_data_get_integer(tmp);
 111
 112         tmp = launch_data_dict_lookup(resp, LAUNCH_JOBKEY_PROGRAM);
 113         if (tmp)
 114                 prog = launch_data_get_string(tmp);
 115
 116         tmp = launch_data_dict_lookup(resp, LAUNCH_JOBKEY_INETDCOMPATIBILITY);
 117         if (tmp) {
 118                 tmp = launch_data_dict_lookup(tmp, LAUNCH_JOBINETDCOMPATIBILITY_WAIT);
 119                 if (tmp)
 120                         w = launch_data_get_bool(tmp);
 121         }
 122
 123         if (launch_data_dict_lookup(resp, LAUNCH_JOBKEY_STANDARDOUTPATH))
 124                 dupstdout = false;
 125
 126         if (launch_data_dict_lookup(resp, LAUNCH_JOBKEY_STANDARDERRORPATH))
 127                 dupstderr = false;
 128
 129         if (!w)
 130                 signal(SIGCHLD, SIG_IGN);
 131
 132         for (;;) {
 133                 if ((r = kevent(kq, NULL, 0, &kev, 1, &timeout)) == -1) {
 134                         syslog(LOG_DEBUG, "kevent(): %m");
 135                         goto out;
 136                 } else if (r == 0) {
 137                         ec = EXIT_SUCCESS;
 138                         goto out;
 139                 }
 140
 141                 if (w) {
 142                         dup2((int)kev.ident, STDIN_FILENO);
 143                         if (dupstdout)
 144                                 dup2((int)kev.ident, STDOUT_FILENO);
 145                         if (dupstderr)
 146                                 dup2((int)kev.ident, STDERR_FILENO);
 147                         execv(prog, argv + 1);
 148                         syslog(LOG_ERR, "execv(): %m");
 149                         exit(EXIT_FAILURE);
 150                 }
 151
 152                 if ((r = accept((int)kev.ident, (struct sockaddr *)&ss, &slen)) == -1) {
 153                         if (errno == EWOULDBLOCK)
 154                                 continue;
 155                         syslog(LOG_WARNING, "accept(): %m");
 156                         goto out;
 157                 } else {
 158                         if (ss.ss_family == AF_INET || ss.ss_family == AF_INET6) {
 159                                 char fromhost[NI_MAXHOST];
 160                                 char fromport[NI_MAXSERV];
 161                                 int gni_r;
 162
 163                                 gni_r = getnameinfo((struct sockaddr *)&ss, slen,
 164                                                 fromhost, (socklen_t) sizeof fromhost,
 165                                                 fromport, (socklen_t) sizeof fromport,
 166                                                 NI_NUMERICHOST | NI_NUMERICSERV);
 167
 168                                 if (gni_r) {
 169                                         syslog(LOG_WARNING, "%s: getnameinfo(): %s", prog, gai_strerror(gni_r));
 170                                 } else {
 171                                         syslog(LOG_INFO, "%s: Connection from: %s on port: %s", prog, fromhost, fromport);
 172                                 }
 173                         } else {
 174                                 syslog(LOG_WARNING, "%s: getnameinfo() only supports IPv4/IPv6. Connection from address family: %u", prog, ss.ss_family);
 175                         }
 176
 177                         switch (fork()) {
 178                         case -1:
 179                                 syslog(LOG_WARNING, "fork(): %m");
 180                                 if (errno != ENOMEM) {
 181                                         continue;
 182                                 }
 183                                 goto out;
 184                         case 0:
 185                                 break;
 186                         default:
 187                                 close(r);
 188                                 continue;
 189                         }
 190
 191                         setpgid(0, 0);
 192
 193 #if !TARGET_OS_EMBEDDED
 194                         if ((tmp = launch_data_dict_lookup(resp, LAUNCH_JOBKEY_SESSIONCREATE)) && launch_data_get_bool(tmp)) {
 195                                 auditinfo_addr_t auinfo = {
 196                                         .ai_termid = { .at_type = AU_IPv4 },
 197                                         .ai_asid = AU_ASSIGN_ASID,
 198                                         .ai_auid = getuid(),
 199                                         .ai_flags = 0,
 200                                 };
 201                                 if (setaudit_addr(&auinfo, sizeof(auinfo)) == 0) {
 202                                         char session[16];
 203                                         snprintf(session, sizeof(session), "%x", auinfo.ai_asid);
 204                                         setenv("SECURITYSESSIONID", session, 1);
 205                                 } else {
 206                                         syslog(LOG_NOTICE, "%s: Setting Audit Session ID failed: %d", prog, errno);
 207                                 }
 208                         }
 209 #endif
 210                         fcntl(r, F_SETFL, 0);
 211                         fcntl(r, F_SETFD, 1);
 212                         dup2(r, STDIN_FILENO);
 213                         if (dupstdout)
 214                                 dup2(r, STDOUT_FILENO);
 215                         if (dupstderr)
 216                                 dup2(r, STDERR_FILENO);
 217                         signal(SIGCHLD, SIG_DFL);
 218                         execv(prog, argv + 1);
 219                         syslog(LOG_ERR, "execv(): %m");
 220                         exit(EXIT_FAILURE);
 221                 }
 222         }
 223
 224 out:
 225         exit(ec);
 226 }