1 | /* |
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2 | * Copyright (c) 1999-2003 Red Hat, Inc. All rights reserved. |
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3 | * |
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4 | * This program is free software; you can redistribute it and/or modify |
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5 | * it under the terms of the GNU General Public License, version 2, |
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6 | * as published by the Free Software Foundation. |
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7 | * |
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8 | * This program is distributed in the hope that it will be useful, |
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9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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11 | * GNU General Public License for more details. |
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12 | * |
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13 | * You should have received a copy of the GNU General Public License |
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14 | * along with this program; if not, write to the Free Software |
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15 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA |
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16 | * |
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17 | */ |
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18 | |
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19 | #include <errno.h> |
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20 | #include <fcntl.h> |
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21 | #include <stdlib.h> |
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22 | #include <string.h> |
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23 | #include <unistd.h> |
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24 | |
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25 | #include <sys/signal.h> |
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26 | #include <sys/poll.h> |
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27 | #include <sys/stat.h> |
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28 | #include <sys/wait.h> |
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29 | |
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30 | #include <popt.h> |
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31 | |
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32 | #include <regex.h> |
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33 | |
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34 | #include "initlog.h" |
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35 | #include "process.h" |
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36 | |
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37 | extern regex_t **regList; |
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38 | |
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39 | int forkCommand(char **args, int *outfd, int *errfd, int *cmdfd, int quiet) { |
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40 | /* Fork command 'cmd', returning pid, and optionally pointer |
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41 | * to open file descriptor fd */ |
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42 | int fdout=-1, fderr=-1, fdcmd=-1, pid; |
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43 | int outpipe[2], errpipe[2], fdpipe[2]; |
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44 | int ourpid; |
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45 | |
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46 | if ( (pipe(outpipe)==-1) || (pipe(errpipe)==-1) || (pipe(fdpipe)==-1) ) { |
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47 | perror("pipe"); |
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48 | return -1; |
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49 | } |
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50 | |
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51 | if (outfd) { |
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52 | fdout = outpipe[1]; |
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53 | *outfd = outpipe[0]; |
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54 | } else { |
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55 | if (!quiet) |
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56 | fdout=dup(1); |
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57 | } |
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58 | if (errfd) { |
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59 | fderr = errpipe[1]; |
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60 | *errfd = errpipe[0]; |
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61 | } else { |
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62 | if (!quiet) |
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63 | fderr=dup(2); |
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64 | } |
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65 | |
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66 | if (cmdfd) { |
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67 | *cmdfd = fdpipe[0]; |
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68 | fdcmd = fdpipe[1]; |
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69 | } else { |
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70 | fdcmd = open("/dev/null",O_WRONLY); |
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71 | } |
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72 | if (fdout==-1 || fderr==-1 || fdcmd==-1) |
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73 | return -1; |
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74 | ourpid = getpid(); |
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75 | if ((pid = fork())==-1) { |
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76 | perror("fork"); |
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77 | return -1; |
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78 | } |
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79 | /* We exec the command normally as the child. However, if we're getting passed |
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80 | * back arguments via an fd, we'll exec it as the parent. Therefore, if Bill |
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81 | * fucks up and we segfault or something, we don't kill rc.sysinit. */ |
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82 | if ( (cmdfd&&!pid) || (pid &&!cmdfd)) { |
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83 | /* parent */ |
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84 | close(fdout); |
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85 | close(fderr); |
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86 | close(fdcmd); |
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87 | if (!pid) |
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88 | return ourpid; |
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89 | else |
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90 | return pid; |
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91 | } else { |
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92 | /* kid */ |
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93 | int sc_open_max; |
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94 | |
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95 | if (outfd) { |
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96 | if ( (dup2(fdout,1)==-1) ) { |
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97 | perror("dup2"); |
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98 | exit(-1); |
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99 | } |
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100 | } else if (quiet) |
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101 | if ((dup2(open("/dev/null",O_WRONLY),1))==-1) { |
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102 | perror("dup2"); |
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103 | exit(-1); |
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104 | } |
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105 | |
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106 | if (errfd) { |
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107 | if ((dup2(fderr,2)==-1)) { |
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108 | perror("dup2"); |
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109 | exit(-1); |
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110 | } |
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111 | } else if (quiet) |
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112 | if ((dup2(open("/dev/null",O_WRONLY),2))==-1) { |
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113 | perror("dup2"); |
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114 | exit(-1); |
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115 | } |
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116 | |
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117 | |
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118 | if ((dup2(fdcmd,CMD_FD)==-1)) { |
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119 | perror("dup2"); |
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120 | exit(-1); |
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121 | } |
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122 | close(fdout); |
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123 | close(fderr); |
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124 | close(fdcmd); |
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125 | if (outfd) |
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126 | close(*outfd); |
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127 | if (errfd) |
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128 | close(*errfd); |
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129 | if (cmdfd) |
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130 | close(*cmdfd); |
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131 | |
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132 | /* close up extra fds, and hope this doesn't break anything */ |
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133 | sc_open_max = sysconf(_SC_OPEN_MAX); |
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134 | if(sc_open_max > 1) { |
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135 | int fd; |
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136 | for(fd = 3; fd < sc_open_max; fd++) { |
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137 | if (!(cmdfd && fd == CMD_FD)) |
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138 | close(fd); |
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139 | } |
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140 | } |
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141 | |
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142 | execvp(args[0],args); |
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143 | perror("execvp"); |
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144 | exit(-1); |
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145 | } |
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146 | } |
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147 | |
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148 | int monitor(char *cmdname, int pid, int numfds, int *fds, int reexec, int quiet, int debug) { |
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149 | struct pollfd *pfds; |
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150 | char *outbuf=NULL; |
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151 | char *tmpstr=NULL; |
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152 | int x,y,rc=-1; |
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153 | int done=0; |
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154 | int output=0; |
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155 | char **cmdargs=NULL; |
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156 | char **tmpargs=NULL; |
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157 | int cmdargc; |
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158 | char *procpath = NULL; |
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159 | |
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160 | if (reexec) { |
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161 | procpath=malloc(20*sizeof(char)); |
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162 | snprintf(procpath,20,"/proc/%d",pid); |
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163 | } |
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164 | |
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165 | pfds = malloc(numfds*sizeof(struct pollfd)); |
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166 | for (x=0;x<numfds;x++) { |
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167 | pfds[x].fd = fds[x]; |
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168 | pfds[x].events = POLLIN | POLLPRI; |
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169 | } |
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170 | |
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171 | while (!done) { |
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172 | usleep(500); |
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173 | if (((x=poll(pfds,numfds,500))==-1)&&errno!=EINTR) { |
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174 | perror("poll"); |
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175 | free(pfds); |
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176 | if (procpath) |
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177 | free(procpath); |
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178 | return -1; |
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179 | } |
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180 | if (!reexec) { |
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181 | if (waitpid(pid,&rc,WNOHANG)) |
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182 | done=1; |
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183 | } else { |
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184 | struct stat sbuf; |
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185 | /* if /proc/pid ain't there and /proc is, it's dead... */ |
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186 | if (stat(procpath,&sbuf)&&!stat("/proc/cpuinfo",&sbuf)) |
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187 | done=1; |
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188 | } |
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189 | if (x<0) |
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190 | continue; |
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191 | y=0; |
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192 | while (y<numfds) { |
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193 | if ( x && ((pfds[y].revents & (POLLIN | POLLPRI)) )) { |
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194 | int bytesread = 0; |
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195 | |
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196 | do { |
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197 | char *b, *buf=calloc(8193,sizeof(char)); |
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198 | b = buf; |
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199 | bytesread = read(pfds[y].fd,buf,8192); |
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200 | if (bytesread==-1) { |
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201 | perror("read"); |
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202 | free(pfds); |
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203 | if (procpath) |
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204 | free(procpath); |
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205 | free(buf); |
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206 | return -1; |
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207 | } |
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208 | if (bytesread) { |
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209 | if (!quiet && !reexec) |
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210 | write(1,buf,bytesread); |
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211 | if (quiet) { |
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212 | outbuf=realloc(outbuf,(outbuf ? strlen(outbuf)+bytesread+1 : bytesread+1)); |
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213 | if (!output) outbuf[0]='\0'; |
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214 | strcat(outbuf,buf); |
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215 | output = 1; |
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216 | } |
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217 | while ((tmpstr=getLine(&buf))) { |
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218 | int ignore=0; |
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219 | |
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220 | if (regList) { |
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221 | int count=0; |
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222 | |
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223 | while (regList[count]) { |
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224 | if (!regexec(regList[count],tmpstr,0,NULL,0)) { |
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225 | ignore=1; |
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226 | break; |
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227 | } |
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228 | count++; |
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229 | } |
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230 | } |
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231 | if (!ignore) { |
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232 | if (!reexec) { |
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233 | if (getenv("IN_INITLOG")) { |
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234 | char *buffer=calloc(8192,sizeof(char)); |
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235 | DDEBUG("sending =%s= to initlog parent\n",tmpstr); |
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236 | snprintf(buffer,8192,"-n %s -s \"%s\"\n", |
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237 | cmdname,tmpstr); |
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238 | /* don't blow up if parent isn't there */ |
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239 | signal(SIGPIPE,SIG_IGN); |
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240 | write(CMD_FD,buffer,strlen(buffer)); |
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241 | signal(SIGPIPE,SIG_DFL); |
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242 | free(buffer); |
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243 | } else { |
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244 | logString(cmdname,tmpstr); |
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245 | } |
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246 | } else { |
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247 | int z; |
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248 | |
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249 | cmdargs=NULL; |
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250 | tmpargs=NULL; |
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251 | cmdargc=0; |
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252 | |
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253 | poptParseArgvString(tmpstr,&cmdargc,&tmpargs); |
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254 | cmdargs=malloc( (cmdargc+2) * sizeof(char *) ); |
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255 | cmdargs[0]=strdup("initlog"); |
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256 | for (z=0;z<(cmdargc);z++) { |
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257 | cmdargs[z+1]=tmpargs[z]; |
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258 | } |
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259 | cmdargs[cmdargc+1]=NULL; |
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260 | processArgs(cmdargc+1,cmdargs,1); |
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261 | free(cmdargs[0]); |
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262 | free(tmpargs); |
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263 | free(cmdargs); |
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264 | } |
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265 | } |
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266 | if (tmpstr) free(tmpstr); |
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267 | } |
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268 | } |
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269 | free(b); |
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270 | } while ( bytesread==8192 ); |
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271 | } |
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272 | y++; |
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273 | } |
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274 | } |
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275 | if ((!WIFEXITED(rc)) || (rc=WEXITSTATUS(rc))) { |
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276 | /* If there was an error and we're quiet, be loud */ |
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277 | |
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278 | if (quiet && output) { |
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279 | write(1,outbuf,strlen(outbuf)); |
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280 | } |
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281 | free(pfds); |
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282 | if (procpath) |
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283 | free(procpath); |
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284 | if(outbuf) |
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285 | free(outbuf); |
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286 | return (rc); |
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287 | } |
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288 | free(pfds); |
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289 | if (procpath) |
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290 | free(procpath); |
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291 | if(outbuf) |
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292 | free(outbuf); |
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293 | return 0; |
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294 | } |
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295 | |
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296 | int runCommand(char *cmd, int reexec, int quiet, int debug) { |
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297 | int fds[2]; |
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298 | int pid,x; |
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299 | char **args, **tmpargs; |
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300 | char *cmdname; |
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301 | |
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302 | poptParseArgvString(cmd,&x,&tmpargs); |
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303 | args = malloc((x+1)*sizeof(char *)); |
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304 | for ( pid = 0; pid < x ; pid++) { |
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305 | args[pid] = strdup(tmpargs[pid]); |
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306 | } |
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307 | args[pid] = NULL; |
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308 | if (strcmp(args[0],"sh") && strcmp(args[0],"/bin/sh")) |
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309 | cmdname = basename(args[0]); |
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310 | else |
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311 | cmdname = basename(args[1]); |
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312 | if ((cmdname[0] =='K' || cmdname[0] == 'S') && |
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313 | ( cmdname[1] >= '0' && cmdname[1] <= '9' ) && |
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314 | ( cmdname[2] >= '0' && cmdname[2] <= '9' ) ) |
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315 | cmdname+=3; |
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316 | if (!reexec) { |
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317 | pid=forkCommand(args,&fds[0],&fds[1],NULL,quiet); |
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318 | if (pid == -1) |
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319 | return -1; |
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320 | x=monitor(cmdname,pid,2,fds,reexec,quiet,debug); |
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321 | } else { |
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322 | setenv("IN_INITLOG","yes",1); |
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323 | pid=forkCommand(args,NULL,NULL,&fds[0],quiet); |
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324 | if (pid == -1) |
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325 | return -1; |
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326 | unsetenv("IN_INITLOG"); |
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327 | x=monitor(cmdname,pid,1,&fds[0],reexec,quiet,debug); |
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328 | } |
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329 | return x; |
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330 | } |
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