1 | /*
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2 | Copyright (c) 2001-2006, Gerrit Pape
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3 | All rights reserved.
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4 |
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5 | Redistribution and use in source and binary forms, with or without
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6 | modification, are permitted provided that the following conditions are met:
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7 |
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8 | 1. Redistributions of source code must retain the above copyright notice,
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9 | this list of conditions and the following disclaimer.
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10 | 2. Redistributions in binary form must reproduce the above copyright
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11 | notice, this list of conditions and the following disclaimer in the
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12 | documentation and/or other materials provided with the distribution.
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13 | 3. The name of the author may not be used to endorse or promote products
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14 | derived from this software without specific prior written permission.
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15 |
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16 | THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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17 | WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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18 | MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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19 | EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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20 | SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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21 | PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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22 | OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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23 | WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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24 | OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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25 | ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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26 | */
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27 |
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28 | /* Busyboxed by Denys Vlasenko <vda.linux@googlemail.com> */
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29 | /* TODO: depends on runit_lib.c - review and reduce/eliminate */
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30 |
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31 | #include <sys/poll.h>
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32 | #include <sys/file.h>
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33 | #include "libbb.h"
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34 | #include "runit_lib.h"
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35 |
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36 | #define MAXSERVICES 1000
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37 |
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38 | /* Should be not needed - all dirs are on same FS, right? */
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39 | #define CHECK_DEVNO_TOO 0
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40 |
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41 | struct service {
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42 | #if CHECK_DEVNO_TOO
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43 | dev_t dev;
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44 | #endif
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45 | ino_t ino;
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46 | pid_t pid;
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47 | smallint isgone;
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48 | };
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49 |
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50 | struct globals {
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51 | struct service *sv;
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52 | char *svdir;
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53 | int svnum;
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54 | #if ENABLE_FEATURE_RUNSVDIR_LOG
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55 | char *rplog;
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56 | int rploglen;
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57 | struct fd_pair logpipe;
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58 | struct pollfd pfd[1];
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59 | unsigned stamplog;
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60 | #endif
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61 | } FIX_ALIASING;
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62 | #define G (*(struct globals*)&bb_common_bufsiz1)
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63 | #define sv (G.sv )
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64 | #define svdir (G.svdir )
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65 | #define svnum (G.svnum )
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66 | #define rplog (G.rplog )
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67 | #define rploglen (G.rploglen )
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68 | #define logpipe (G.logpipe )
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69 | #define pfd (G.pfd )
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70 | #define stamplog (G.stamplog )
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71 | #define INIT_G() do { \
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72 | } while (0)
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73 |
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74 | static void fatal2_cannot(const char *m1, const char *m2)
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75 | {
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76 | bb_perror_msg_and_die("%s: fatal: can't %s%s", svdir, m1, m2);
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77 | /* was exiting 100 */
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78 | }
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79 | static void warn3x(const char *m1, const char *m2, const char *m3)
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80 | {
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81 | bb_error_msg("%s: warning: %s%s%s", svdir, m1, m2, m3);
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82 | }
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83 | static void warn2_cannot(const char *m1, const char *m2)
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84 | {
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85 | warn3x("can't ", m1, m2);
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86 | }
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87 | #if ENABLE_FEATURE_RUNSVDIR_LOG
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88 | static void warnx(const char *m1)
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89 | {
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90 | warn3x(m1, "", "");
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91 | }
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92 | #endif
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93 |
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94 | /* inlining + vfork -> bigger code */
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95 | static NOINLINE pid_t runsv(const char *name)
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96 | {
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97 | pid_t pid;
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98 |
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99 | /* If we got signaled, stop spawning children at once! */
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100 | if (bb_got_signal)
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101 | return 0;
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102 |
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103 | pid = vfork();
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104 | if (pid == -1) {
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105 | warn2_cannot("vfork", "");
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106 | return 0;
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107 | }
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108 | if (pid == 0) {
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109 | /* child */
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110 | if (option_mask32 & 1) /* -P option? */
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111 | setsid();
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112 | /* man execv:
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113 | * "Signals set to be caught by the calling process image
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114 | * shall be set to the default action in the new process image."
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115 | * Therefore, we do not need this: */
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116 | #if 0
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117 | bb_signals(0
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118 | | (1 << SIGHUP)
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119 | | (1 << SIGTERM)
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120 | , SIG_DFL);
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121 | #endif
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122 | execlp("runsv", "runsv", name, (char *) NULL);
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123 | fatal2_cannot("start runsv ", name);
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124 | }
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125 | return pid;
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126 | }
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127 |
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128 | /* gcc 4.3.0 does better with NOINLINE */
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129 | static NOINLINE int do_rescan(void)
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130 | {
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131 | DIR *dir;
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132 | struct dirent *d;
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133 | int i;
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134 | struct stat s;
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135 | int need_rescan = 0;
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136 |
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137 | dir = opendir(".");
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138 | if (!dir) {
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139 | warn2_cannot("open directory ", svdir);
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140 | return 1; /* need to rescan again soon */
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141 | }
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142 | for (i = 0; i < svnum; i++)
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143 | sv[i].isgone = 1;
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144 |
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145 | while (1) {
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146 | errno = 0;
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147 | d = readdir(dir);
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148 | if (!d)
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149 | break;
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150 | if (d->d_name[0] == '.')
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151 | continue;
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152 | if (stat(d->d_name, &s) == -1) {
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153 | warn2_cannot("stat ", d->d_name);
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154 | continue;
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155 | }
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156 | if (!S_ISDIR(s.st_mode))
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157 | continue;
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158 | /* Do we have this service listed already? */
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159 | for (i = 0; i < svnum; i++) {
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160 | if ((sv[i].ino == s.st_ino)
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161 | #if CHECK_DEVNO_TOO
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162 | && (sv[i].dev == s.st_dev)
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163 | #endif
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164 | ) {
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165 | if (sv[i].pid == 0) /* restart if it has died */
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166 | goto run_ith_sv;
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167 | sv[i].isgone = 0; /* "we still see you" */
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168 | goto next_dentry;
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169 | }
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170 | }
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171 | { /* Not found, make new service */
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172 | struct service *svnew = realloc(sv, (i+1) * sizeof(*sv));
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173 | if (!svnew) {
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174 | warn2_cannot("start runsv ", d->d_name);
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175 | need_rescan = 1;
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176 | continue;
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177 | }
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178 | sv = svnew;
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179 | svnum++;
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180 | #if CHECK_DEVNO_TOO
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181 | sv[i].dev = s.st_dev;
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182 | #endif
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183 | sv[i].ino = s.st_ino;
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184 | run_ith_sv:
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185 | sv[i].pid = runsv(d->d_name);
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186 | sv[i].isgone = 0;
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187 | }
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188 | next_dentry: ;
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189 | }
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190 | i = errno;
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191 | closedir(dir);
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192 | if (i) { /* readdir failed */
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193 | warn2_cannot("read directory ", svdir);
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194 | return 1; /* need to rescan again soon */
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195 | }
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196 |
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197 | /* Send SIGTERM to runsv whose directories
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198 | * were no longer found (-> must have been removed) */
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199 | for (i = 0; i < svnum; i++) {
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200 | if (!sv[i].isgone)
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201 | continue;
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202 | if (sv[i].pid)
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203 | kill(sv[i].pid, SIGTERM);
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204 | svnum--;
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205 | sv[i] = sv[svnum];
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206 | i--; /* so that we don't skip new sv[i] (bug was here!) */
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207 | }
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208 | return need_rescan;
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209 | }
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210 |
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211 | int runsvdir_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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212 | int runsvdir_main(int argc UNUSED_PARAM, char **argv)
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213 | {
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214 | struct stat s;
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215 | dev_t last_dev = last_dev; /* for gcc */
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216 | ino_t last_ino = last_ino; /* for gcc */
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217 | time_t last_mtime = 0;
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218 | int wstat;
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219 | int curdir;
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220 | pid_t pid;
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221 | unsigned deadline;
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222 | unsigned now;
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223 | unsigned stampcheck;
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224 | int i;
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225 | int need_rescan = 1;
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226 | char *opt_s_argv[3];
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227 |
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228 | INIT_G();
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229 |
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230 | opt_complementary = "-1";
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231 | opt_s_argv[0] = NULL;
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232 | opt_s_argv[2] = NULL;
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233 | getopt32(argv, "Ps:", &opt_s_argv[0]);
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234 | argv += optind;
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235 |
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236 | bb_signals(0
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237 | | (1 << SIGTERM)
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238 | | (1 << SIGHUP)
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239 | /* For busybox's init, SIGTERM == reboot,
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240 | * SIGUSR1 == halt
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241 | * SIGUSR2 == poweroff
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242 | * so we need to intercept SIGUSRn too.
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243 | * Note that we do not implement actual reboot
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244 | * (killall(TERM) + umount, etc), we just pause
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245 | * respawing and avoid exiting (-> making kernel oops).
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246 | * The user is responsible for the rest. */
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247 | | (getpid() == 1 ? ((1 << SIGUSR1) | (1 << SIGUSR2)) : 0)
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248 | , record_signo);
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249 | svdir = *argv++;
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250 |
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251 | #if ENABLE_FEATURE_RUNSVDIR_LOG
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252 | /* setup log */
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253 | if (*argv) {
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254 | rplog = *argv;
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255 | rploglen = strlen(rplog);
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256 | if (rploglen < 7) {
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257 | warnx("log must have at least seven characters");
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258 | } else if (piped_pair(logpipe)) {
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259 | warnx("can't create pipe for log");
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260 | } else {
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261 | close_on_exec_on(logpipe.rd);
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262 | close_on_exec_on(logpipe.wr);
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263 | ndelay_on(logpipe.rd);
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264 | ndelay_on(logpipe.wr);
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265 | if (dup2(logpipe.wr, 2) == -1) {
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266 | warnx("can't set filedescriptor for log");
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267 | } else {
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268 | pfd[0].fd = logpipe.rd;
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269 | pfd[0].events = POLLIN;
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270 | stamplog = monotonic_sec();
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271 | goto run;
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272 | }
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273 | }
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274 | rplog = NULL;
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275 | warnx("log service disabled");
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276 | }
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277 | run:
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278 | #endif
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279 | curdir = open(".", O_RDONLY|O_NDELAY);
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280 | if (curdir == -1)
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281 | fatal2_cannot("open current directory", "");
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282 | close_on_exec_on(curdir);
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283 |
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284 | stampcheck = monotonic_sec();
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285 |
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286 | for (;;) {
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287 | /* collect children */
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288 | for (;;) {
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289 | pid = wait_any_nohang(&wstat);
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290 | if (pid <= 0)
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291 | break;
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292 | for (i = 0; i < svnum; i++) {
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293 | if (pid == sv[i].pid) {
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294 | /* runsv has died */
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295 | sv[i].pid = 0;
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296 | need_rescan = 1;
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297 | }
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298 | }
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299 | }
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300 |
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301 | now = monotonic_sec();
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302 | if ((int)(now - stampcheck) >= 0) {
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303 | /* wait at least a second */
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304 | stampcheck = now + 1;
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305 |
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306 | if (stat(svdir, &s) != -1) {
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307 | if (need_rescan || s.st_mtime != last_mtime
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308 | || s.st_ino != last_ino || s.st_dev != last_dev
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309 | ) {
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310 | /* svdir modified */
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311 | if (chdir(svdir) != -1) {
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312 | last_mtime = s.st_mtime;
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313 | last_dev = s.st_dev;
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314 | last_ino = s.st_ino;
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315 | /* if the svdir changed this very second, wait until the
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316 | * next second, because we won't be able to detect more
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317 | * changes within this second */
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318 | while (time(NULL) == last_mtime)
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319 | usleep(100000);
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320 | need_rescan = do_rescan();
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321 | while (fchdir(curdir) == -1) {
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322 | warn2_cannot("change directory, pausing", "");
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323 | sleep(5);
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324 | }
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325 | } else {
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326 | warn2_cannot("change directory to ", svdir);
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327 | }
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328 | }
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329 | } else {
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330 | warn2_cannot("stat ", svdir);
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331 | }
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332 | }
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333 |
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334 | #if ENABLE_FEATURE_RUNSVDIR_LOG
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335 | if (rplog) {
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336 | if ((int)(now - stamplog) >= 0) {
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337 | write(logpipe.wr, ".", 1);
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338 | stamplog = now + 900;
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339 | }
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340 | }
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341 | pfd[0].revents = 0;
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342 | #endif
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343 | deadline = (need_rescan ? 1 : 5);
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344 | sig_block(SIGCHLD);
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345 | #if ENABLE_FEATURE_RUNSVDIR_LOG
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346 | if (rplog)
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347 | poll(pfd, 1, deadline*1000);
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348 | else
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349 | #endif
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350 | sleep(deadline);
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351 | sig_unblock(SIGCHLD);
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352 |
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353 | #if ENABLE_FEATURE_RUNSVDIR_LOG
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354 | if (pfd[0].revents & POLLIN) {
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355 | char ch;
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356 | while (read(logpipe.rd, &ch, 1) > 0) {
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357 | if (ch < ' ')
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358 | ch = ' ';
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359 | for (i = 6; i < rploglen; i++)
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360 | rplog[i-1] = rplog[i];
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361 | rplog[rploglen-1] = ch;
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362 | }
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363 | }
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364 | #endif
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365 | if (!bb_got_signal)
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366 | continue;
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367 |
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368 | /* -s SCRIPT: useful if we are init.
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369 | * In this case typically script never returns,
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370 | * it halts/powers off/reboots the system. */
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371 | if (opt_s_argv[0]) {
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372 | /* Single parameter: signal# */
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373 | opt_s_argv[1] = utoa(bb_got_signal);
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374 | pid = spawn(opt_s_argv);
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375 | if (pid > 0) {
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376 | /* Remembering to wait for _any_ children,
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377 | * not just pid */
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378 | while (wait(NULL) != pid)
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379 | continue;
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380 | }
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381 | }
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382 |
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383 | if (bb_got_signal == SIGHUP) {
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384 | for (i = 0; i < svnum; i++)
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385 | if (sv[i].pid)
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386 | kill(sv[i].pid, SIGTERM);
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387 | }
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388 | /* SIGHUP or SIGTERM (or SIGUSRn if we are init) */
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389 | /* Exit unless we are init */
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390 | if (getpid() != 1)
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391 | return (SIGHUP == bb_got_signal) ? 111 : EXIT_SUCCESS;
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392 |
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393 | /* init continues to monitor services forever */
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394 | bb_got_signal = 0;
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395 | } /* for (;;) */
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396 | }
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