1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * run as root, but NOT setuid root
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4 | *
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5 | * Copyright 1994 Matthew Dillon (dillon@apollo.west.oic.com)
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6 | * (version 2.3.2)
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7 | * Vladimir Oleynik <dzo@simtreas.ru> (C) 2002
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8 | *
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9 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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10 | */
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11 | //config:config CROND
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12 | //config: bool "crond"
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13 | //config: default y
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14 | //config: select FEATURE_SYSLOG
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15 | //config: help
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16 | //config: Crond is a background daemon that parses individual crontab
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17 | //config: files and executes commands on behalf of the users in question.
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18 | //config: This is a port of dcron from slackware. It uses files of the
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19 | //config: format /var/spool/cron/crontabs/<username> files, for example:
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20 | //config: $ cat /var/spool/cron/crontabs/root
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21 | //config: # Run daily cron jobs at 4:40 every day:
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22 | //config: 40 4 * * * /etc/cron/daily > /dev/null 2>&1
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23 | //config:
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24 | //config:config FEATURE_CROND_D
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25 | //config: bool "Support option -d to redirect output to stderr"
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26 | //config: depends on CROND
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27 | //config: default y
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28 | //config: help
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29 | //config: -d N sets loglevel (0:most verbose) and directs all output to stderr.
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30 | //config:
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31 | //config:config FEATURE_CROND_CALL_SENDMAIL
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32 | //config: bool "Report command output via email (using sendmail)"
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33 | //config: default y
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34 | //config: depends on CROND
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35 | //config: help
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36 | //config: Command output will be sent to corresponding user via email.
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37 | //config:
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38 | //config:config FEATURE_CROND_DIR
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39 | //config: string "crond spool directory"
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40 | //config: default "/var/spool/cron"
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41 | //config: depends on CROND || CRONTAB
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42 | //config: help
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43 | //config: Location of crond spool.
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44 |
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45 | //applet:IF_CROND(APPLET(crond, BB_DIR_USR_SBIN, BB_SUID_DROP))
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46 |
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47 | //kbuild:lib-$(CONFIG_CROND) += crond.o
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48 |
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49 | //usage:#define crond_trivial_usage
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50 | //usage: "-fbS -l N " IF_FEATURE_CROND_D("-d N ") "-L LOGFILE -c DIR"
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51 | //usage:#define crond_full_usage "\n\n"
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52 | //usage: " -f Foreground"
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53 | //usage: "\n -b Background (default)"
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54 | //usage: "\n -S Log to syslog (default)"
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55 | //usage: "\n -l N Set log level. Most verbose:0, default:8"
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56 | //usage: IF_FEATURE_CROND_D(
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57 | //usage: "\n -d N Set log level, log to stderr"
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58 | //usage: )
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59 | //usage: "\n -L FILE Log to FILE"
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60 | //usage: "\n -c DIR Cron dir. Default:"CONFIG_FEATURE_CROND_DIR"/crontabs"
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61 |
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62 | #include "libbb.h"
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63 | #include "common_bufsiz.h"
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64 | #include <syslog.h>
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65 |
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66 | /* glibc frees previous setenv'ed value when we do next setenv()
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67 | * of the same variable. uclibc does not do this! */
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68 | #if (defined(__GLIBC__) && !defined(__UCLIBC__)) /* || OTHER_SAFE_LIBC... */
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69 | # define SETENV_LEAKS 0
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70 | #else
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71 | # define SETENV_LEAKS 1
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72 | #endif
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73 |
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74 |
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75 | #define CRON_DIR CONFIG_FEATURE_CROND_DIR
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76 | #define CRONTABS CONFIG_FEATURE_CROND_DIR "/crontabs"
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77 | #ifndef SENDMAIL
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78 | # define SENDMAIL "sendmail"
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79 | #endif
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80 | #ifndef SENDMAIL_ARGS
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81 | # define SENDMAIL_ARGS "-ti"
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82 | #endif
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83 | #ifndef CRONUPDATE
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84 | # define CRONUPDATE "cron.update"
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85 | #endif
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86 | #ifndef MAXLINES
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87 | # define MAXLINES 256 /* max lines in non-root crontabs */
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88 | #endif
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89 |
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90 |
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91 | typedef struct CronFile {
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92 | struct CronFile *cf_next;
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93 | struct CronLine *cf_lines;
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94 | char *cf_username;
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95 | smallint cf_wants_starting; /* bool: one or more jobs ready */
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96 | smallint cf_has_running; /* bool: one or more jobs running */
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97 | smallint cf_deleted; /* marked for deletion (but still has running jobs) */
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98 | } CronFile;
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99 |
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100 | typedef struct CronLine {
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101 | struct CronLine *cl_next;
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102 | char *cl_cmd; /* shell command */
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103 | pid_t cl_pid; /* >0:running, <0:needs to be started in this minute, 0:dormant */
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104 | #if ENABLE_FEATURE_CROND_CALL_SENDMAIL
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105 | int cl_empty_mail_size; /* size of mail header only, 0 if no mailfile */
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106 | char *cl_mailto; /* whom to mail results, may be NULL */
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107 | #endif
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108 | char *cl_shell;
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109 | /* ordered by size, not in natural order. makes code smaller: */
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110 | char cl_Dow[7]; /* 0-6, beginning sunday */
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111 | char cl_Mons[12]; /* 0-11 */
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112 | char cl_Hrs[24]; /* 0-23 */
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113 | char cl_Days[32]; /* 1-31 */
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114 | char cl_Mins[60]; /* 0-59 */
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115 | } CronLine;
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116 |
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117 |
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118 | #define DAEMON_UID 0
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119 |
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120 |
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121 | enum {
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122 | OPT_l = (1 << 0),
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123 | OPT_L = (1 << 1),
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124 | OPT_f = (1 << 2),
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125 | OPT_b = (1 << 3),
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126 | OPT_S = (1 << 4),
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127 | OPT_c = (1 << 5),
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128 | OPT_d = (1 << 6) * ENABLE_FEATURE_CROND_D,
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129 | };
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130 |
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131 | struct globals {
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132 | unsigned log_level; /* = 8; */
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133 | time_t crontab_dir_mtime;
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134 | const char *log_filename;
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135 | const char *crontab_dir_name; /* = CRONTABS; */
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136 | CronFile *cron_files;
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137 | #if SETENV_LEAKS
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138 | char *env_var_user;
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139 | char *env_var_home;
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140 | char *env_var_shell;
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141 | char *env_var_logname;
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142 | #endif
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143 | } FIX_ALIASING;
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144 | #define G (*(struct globals*)bb_common_bufsiz1)
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145 | #define INIT_G() do { \
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146 | setup_common_bufsiz(); \
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147 | G.log_level = 8; \
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148 | G.crontab_dir_name = CRONTABS; \
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149 | } while (0)
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150 |
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151 | /* Log levels:
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152 | * 0 is the most verbose, default 8.
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153 | * For some reason, in fact only 5, 7 and 8 are used.
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154 | */
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155 | static void crondlog(unsigned level, const char *msg, va_list va)
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156 | {
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157 | if (level >= G.log_level) {
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158 | /*
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159 | * We are called only for info meesages.
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160 | * Warnings/errors use plain bb_[p]error_msg's, which
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161 | * need not touch syslog_level
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162 | * (they are ok with LOG_ERR default).
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163 | */
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164 | syslog_level = LOG_INFO;
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165 | bb_verror_msg(msg, va, /* strerr: */ NULL);
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166 | syslog_level = LOG_ERR;
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167 | }
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168 | }
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169 |
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170 | static void log5(const char *msg, ...)
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171 | {
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172 | va_list va;
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173 | va_start(va, msg);
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174 | crondlog(4, msg, va);
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175 | va_end(va);
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176 | }
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177 |
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178 | static void log7(const char *msg, ...)
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179 | {
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180 | va_list va;
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181 | va_start(va, msg);
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182 | crondlog(7, msg, va);
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183 | va_end(va);
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184 | }
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185 |
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186 | static void log8(const char *msg, ...)
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187 | {
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188 | va_list va;
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189 | va_start(va, msg);
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190 | crondlog(8, msg, va);
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191 | va_end(va);
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192 | }
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193 |
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194 |
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195 | static const char DowAry[] ALIGN1 =
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196 | "sun""mon""tue""wed""thu""fri""sat"
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197 | ;
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198 |
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199 | static const char MonAry[] ALIGN1 =
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200 | "jan""feb""mar""apr""may""jun""jul""aug""sep""oct""nov""dec"
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201 | ;
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202 |
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203 | static void ParseField(char *user, char *ary, int modvalue, int off,
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204 | const char *names, char *ptr)
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205 | /* 'names' is a pointer to a set of 3-char abbreviations */
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206 | {
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207 | char *base = ptr;
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208 | int n1 = -1;
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209 | int n2 = -1;
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210 |
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211 | // this can't happen due to config_read()
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212 | /*if (base == NULL)
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213 | return;*/
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214 |
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215 | while (1) {
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216 | int skip = 0;
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217 |
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218 | /* Handle numeric digit or symbol or '*' */
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219 | if (*ptr == '*') {
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220 | n1 = 0; /* everything will be filled */
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221 | n2 = modvalue - 1;
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222 | skip = 1;
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223 | ++ptr;
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224 | } else if (isdigit(*ptr)) {
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225 | char *endp;
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226 | if (n1 < 0) {
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227 | n1 = strtol(ptr, &endp, 10) + off;
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228 | } else {
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229 | n2 = strtol(ptr, &endp, 10) + off;
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230 | }
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231 | ptr = endp; /* gcc likes temp var for &endp */
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232 | skip = 1;
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233 | } else if (names) {
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234 | int i;
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235 |
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236 | for (i = 0; names[i]; i += 3) {
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237 | /* was using strncmp before... */
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238 | if (strncasecmp(ptr, &names[i], 3) == 0) {
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239 | ptr += 3;
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240 | if (n1 < 0) {
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241 | n1 = i / 3;
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242 | } else {
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243 | n2 = i / 3;
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244 | }
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245 | skip = 1;
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246 | break;
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247 | }
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248 | }
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249 | }
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250 |
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251 | /* handle optional range '-' */
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252 | if (skip == 0) {
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253 | goto err;
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254 | }
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255 | if (*ptr == '-' && n2 < 0) {
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256 | ++ptr;
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257 | continue;
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258 | }
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259 |
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260 | /*
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261 | * collapse single-value ranges, handle skipmark, and fill
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262 | * in the character array appropriately.
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263 | */
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264 | if (n2 < 0) {
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265 | n2 = n1;
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266 | }
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267 | if (*ptr == '/') {
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268 | char *endp;
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269 | skip = strtol(ptr + 1, &endp, 10);
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270 | ptr = endp; /* gcc likes temp var for &endp */
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271 | }
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272 |
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273 | /*
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274 | * fill array, using a failsafe is the easiest way to prevent
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275 | * an endless loop
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276 | */
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277 | {
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278 | int s0 = 1;
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279 | int failsafe = 1024;
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280 |
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281 | --n1;
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282 | do {
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283 | n1 = (n1 + 1) % modvalue;
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284 |
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285 | if (--s0 == 0) {
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286 | ary[n1 % modvalue] = 1;
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287 | s0 = skip;
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288 | }
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289 | if (--failsafe == 0) {
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290 | goto err;
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291 | }
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292 | } while (n1 != n2);
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293 | }
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294 | if (*ptr != ',') {
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295 | break;
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296 | }
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297 | ++ptr;
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298 | n1 = -1;
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299 | n2 = -1;
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300 | }
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301 |
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302 | if (*ptr) {
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303 | err:
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304 | bb_error_msg("user %s: parse error at %s", user, base);
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305 | return;
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306 | }
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307 |
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308 | /* can't use log5 (it inserts newlines), open-coding it */
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309 | if (G.log_level <= 5 && logmode != LOGMODE_SYSLOG) {
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310 | int i;
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311 | for (i = 0; i < modvalue; ++i)
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312 | fprintf(stderr, "%d", (unsigned char)ary[i]);
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313 | bb_putchar_stderr('\n');
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314 | }
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315 | }
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316 |
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317 | static void FixDayDow(CronLine *line)
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318 | {
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319 | unsigned i;
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320 | int weekUsed = 0;
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321 | int daysUsed = 0;
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322 |
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323 | for (i = 0; i < ARRAY_SIZE(line->cl_Dow); ++i) {
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324 | if (line->cl_Dow[i] == 0) {
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325 | weekUsed = 1;
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326 | break;
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327 | }
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328 | }
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329 | for (i = 0; i < ARRAY_SIZE(line->cl_Days); ++i) {
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330 | if (line->cl_Days[i] == 0) {
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331 | daysUsed = 1;
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332 | break;
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333 | }
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334 | }
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335 | if (weekUsed != daysUsed) {
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336 | if (weekUsed)
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337 | memset(line->cl_Days, 0, sizeof(line->cl_Days));
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338 | else /* daysUsed */
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339 | memset(line->cl_Dow, 0, sizeof(line->cl_Dow));
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340 | }
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341 | }
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342 |
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343 | /*
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344 | * delete_cronfile() - delete user database
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345 | *
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346 | * Note: multiple entries for same user may exist if we were unable to
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347 | * completely delete a database due to running processes.
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348 | */
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349 | //FIXME: we will start a new job even if the old job is running
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350 | //if crontab was reloaded: crond thinks that "new" job is different from "old"
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351 | //even if they are in fact completely the same. Example
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352 | //Crontab was:
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353 | // 0-59 * * * * job1
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354 | // 0-59 * * * * long_running_job2
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355 | //User edits crontab to:
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356 | // 0-59 * * * * job1_updated
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357 | // 0-59 * * * * long_running_job2
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358 | //Bug: crond can now start another long_running_job2 even if old one
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359 | //is still running.
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360 | //OTOH most other versions of cron do not wait for job termination anyway,
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361 | //they end up with multiple copies of jobs if they don't terminate soon enough.
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362 | static void delete_cronfile(const char *userName)
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363 | {
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364 | CronFile **pfile = &G.cron_files;
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365 | CronFile *file;
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366 |
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367 | while ((file = *pfile) != NULL) {
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368 | if (strcmp(userName, file->cf_username) == 0) {
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369 | CronLine **pline = &file->cf_lines;
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370 | CronLine *line;
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371 |
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372 | file->cf_has_running = 0;
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373 | file->cf_deleted = 1;
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374 |
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375 | while ((line = *pline) != NULL) {
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376 | if (line->cl_pid > 0) {
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377 | file->cf_has_running = 1;
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378 | pline = &line->cl_next;
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379 | } else {
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380 | *pline = line->cl_next;
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381 | free(line->cl_cmd);
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382 | free(line);
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383 | }
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384 | }
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385 | if (file->cf_has_running == 0) {
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386 | *pfile = file->cf_next;
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387 | free(file->cf_username);
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388 | free(file);
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389 | continue;
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390 | }
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391 | }
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392 | pfile = &file->cf_next;
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393 | }
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394 | }
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395 |
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396 | static void load_crontab(const char *fileName)
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397 | {
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398 | struct parser_t *parser;
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399 | struct stat sbuf;
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400 | int maxLines;
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401 | char *tokens[6];
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402 | #if ENABLE_FEATURE_CROND_CALL_SENDMAIL
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403 | char *mailTo = NULL;
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404 | #endif
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405 | char *shell = NULL;
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406 |
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407 | delete_cronfile(fileName);
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408 |
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409 | if (!getpwnam(fileName)) {
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410 | log7("ignoring file '%s' (no such user)", fileName);
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411 | return;
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412 | }
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413 |
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414 | parser = config_open(fileName);
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415 | if (!parser)
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416 | return;
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417 |
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418 | maxLines = (strcmp(fileName, "root") == 0) ? 65535 : MAXLINES;
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419 |
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420 | if (fstat(fileno(parser->fp), &sbuf) == 0 && sbuf.st_uid == DAEMON_UID) {
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421 | CronFile *file = xzalloc(sizeof(CronFile));
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422 | CronLine **pline;
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423 | int n;
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424 |
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425 | file->cf_username = xstrdup(fileName);
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426 | pline = &file->cf_lines;
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427 |
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428 | while (1) {
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429 | CronLine *line;
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430 |
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431 | if (!--maxLines) {
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432 | bb_error_msg("user %s: too many lines", fileName);
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433 | break;
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434 | }
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435 |
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436 | n = config_read(parser, tokens, 6, 1, "# \t", PARSE_NORMAL | PARSE_KEEP_COPY);
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437 | if (!n)
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438 | break;
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439 |
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440 | log5("user:%s entry:%s", fileName, parser->data);
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441 |
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442 | /* check if line is setting MAILTO= */
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443 | if (is_prefixed_with(tokens[0], "MAILTO=")) {
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444 | #if ENABLE_FEATURE_CROND_CALL_SENDMAIL
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445 | free(mailTo);
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446 | mailTo = (tokens[0][7]) ? xstrdup(&tokens[0][7]) : NULL;
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447 | #endif /* otherwise just ignore such lines */
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448 | continue;
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449 | }
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450 | if (is_prefixed_with(tokens[0], "SHELL=")) {
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451 | free(shell);
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452 | shell = xstrdup(&tokens[0][6]);
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453 | continue;
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454 | }
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455 | //TODO: handle HOME= too? "man crontab" says:
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456 | //name = value
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457 | //
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458 | //where the spaces around the equal-sign (=) are optional, and any subsequent
|
---|
459 | //non-leading spaces in value will be part of the value assigned to name.
|
---|
460 | //The value string may be placed in quotes (single or double, but matching)
|
---|
461 | //to preserve leading or trailing blanks.
|
---|
462 | //
|
---|
463 | //Several environment variables are set up automatically by the cron(8) daemon.
|
---|
464 | //SHELL is set to /bin/sh, and LOGNAME and HOME are set from the /etc/passwd
|
---|
465 | //line of the crontab's owner. HOME and SHELL may be overridden by settings
|
---|
466 | //in the crontab; LOGNAME may not.
|
---|
467 |
|
---|
468 | /* check if a minimum of tokens is specified */
|
---|
469 | if (n < 6)
|
---|
470 | continue;
|
---|
471 | *pline = line = xzalloc(sizeof(*line));
|
---|
472 | /* parse date ranges */
|
---|
473 | ParseField(file->cf_username, line->cl_Mins, 60, 0, NULL, tokens[0]);
|
---|
474 | ParseField(file->cf_username, line->cl_Hrs, 24, 0, NULL, tokens[1]);
|
---|
475 | ParseField(file->cf_username, line->cl_Days, 32, 0, NULL, tokens[2]);
|
---|
476 | ParseField(file->cf_username, line->cl_Mons, 12, -1, MonAry, tokens[3]);
|
---|
477 | ParseField(file->cf_username, line->cl_Dow, 7, 0, DowAry, tokens[4]);
|
---|
478 | /*
|
---|
479 | * fix days and dow - if one is not "*" and the other
|
---|
480 | * is "*", the other is set to 0, and vise-versa
|
---|
481 | */
|
---|
482 | FixDayDow(line);
|
---|
483 | #if ENABLE_FEATURE_CROND_CALL_SENDMAIL
|
---|
484 | /* copy mailto (can be NULL) */
|
---|
485 | line->cl_mailto = xstrdup(mailTo);
|
---|
486 | #endif
|
---|
487 | line->cl_shell = xstrdup(shell);
|
---|
488 | /* copy command */
|
---|
489 | line->cl_cmd = xstrdup(tokens[5]);
|
---|
490 | pline = &line->cl_next;
|
---|
491 | //bb_error_msg("M[%s]F[%s][%s][%s][%s][%s][%s]", mailTo, tokens[0], tokens[1], tokens[2], tokens[3], tokens[4], tokens[5]);
|
---|
492 | }
|
---|
493 | *pline = NULL;
|
---|
494 |
|
---|
495 | file->cf_next = G.cron_files;
|
---|
496 | G.cron_files = file;
|
---|
497 | }
|
---|
498 | config_close(parser);
|
---|
499 | #if ENABLE_FEATURE_CROND_CALL_SENDMAIL
|
---|
500 | free(mailTo);
|
---|
501 | #endif
|
---|
502 | free(shell);
|
---|
503 | }
|
---|
504 |
|
---|
505 | static void process_cron_update_file(void)
|
---|
506 | {
|
---|
507 | FILE *fi;
|
---|
508 | char buf[256];
|
---|
509 |
|
---|
510 | fi = fopen_for_read(CRONUPDATE);
|
---|
511 | if (fi != NULL) {
|
---|
512 | unlink(CRONUPDATE);
|
---|
513 | while (fgets(buf, sizeof(buf), fi) != NULL) {
|
---|
514 | /* use first word only */
|
---|
515 | skip_non_whitespace(buf)[0] = '\0';
|
---|
516 | load_crontab(buf);
|
---|
517 | }
|
---|
518 | fclose(fi);
|
---|
519 | }
|
---|
520 | }
|
---|
521 |
|
---|
522 | static void rescan_crontab_dir(void)
|
---|
523 | {
|
---|
524 | CronFile *file;
|
---|
525 |
|
---|
526 | /* Delete all files until we only have ones with running jobs (or none) */
|
---|
527 | again:
|
---|
528 | for (file = G.cron_files; file; file = file->cf_next) {
|
---|
529 | if (!file->cf_deleted) {
|
---|
530 | delete_cronfile(file->cf_username);
|
---|
531 | goto again;
|
---|
532 | }
|
---|
533 | }
|
---|
534 |
|
---|
535 | /* Remove cron update file */
|
---|
536 | unlink(CRONUPDATE);
|
---|
537 | /* Re-chdir, in case directory was renamed & deleted */
|
---|
538 | xchdir(G.crontab_dir_name);
|
---|
539 |
|
---|
540 | /* Scan directory and add associated users */
|
---|
541 | {
|
---|
542 | DIR *dir = opendir(".");
|
---|
543 | struct dirent *den;
|
---|
544 |
|
---|
545 | /* xopendir exists, but "can't open '.'" is not informative */
|
---|
546 | if (!dir)
|
---|
547 | bb_error_msg_and_die("can't open '%s'", G.crontab_dir_name);
|
---|
548 | while ((den = readdir(dir)) != NULL) {
|
---|
549 | if (strchr(den->d_name, '.') != NULL) {
|
---|
550 | continue;
|
---|
551 | }
|
---|
552 | load_crontab(den->d_name);
|
---|
553 | }
|
---|
554 | closedir(dir);
|
---|
555 | }
|
---|
556 | }
|
---|
557 |
|
---|
558 | #if SETENV_LEAKS
|
---|
559 | /* We set environment *before* vfork (because we want to use vfork),
|
---|
560 | * so we cannot use setenv() - repeated calls to setenv() may leak memory!
|
---|
561 | * Using putenv(), and freeing memory after unsetenv() won't leak */
|
---|
562 | static void safe_setenv(char **pvar_val, const char *var, const char *val)
|
---|
563 | {
|
---|
564 | char *var_val = *pvar_val;
|
---|
565 |
|
---|
566 | if (var_val) {
|
---|
567 | bb_unsetenv_and_free(var_val);
|
---|
568 | }
|
---|
569 | *pvar_val = xasprintf("%s=%s", var, val);
|
---|
570 | putenv(*pvar_val);
|
---|
571 | }
|
---|
572 | #endif
|
---|
573 |
|
---|
574 | static void set_env_vars(struct passwd *pas, const char *shell)
|
---|
575 | {
|
---|
576 | /* POSIX requires crond to set up at least HOME, LOGNAME, PATH, SHELL.
|
---|
577 | * We assume crond inherited suitable PATH.
|
---|
578 | */
|
---|
579 | #if SETENV_LEAKS
|
---|
580 | safe_setenv(&G.env_var_logname, "LOGNAME", pas->pw_name);
|
---|
581 | safe_setenv(&G.env_var_user, "USER", pas->pw_name);
|
---|
582 | safe_setenv(&G.env_var_home, "HOME", pas->pw_dir);
|
---|
583 | safe_setenv(&G.env_var_shell, "SHELL", shell);
|
---|
584 | #else
|
---|
585 | xsetenv("LOGNAME", pas->pw_name);
|
---|
586 | xsetenv("USER", pas->pw_name);
|
---|
587 | xsetenv("HOME", pas->pw_dir);
|
---|
588 | xsetenv("SHELL", shell);
|
---|
589 | #endif
|
---|
590 | }
|
---|
591 |
|
---|
592 | static void change_user(struct passwd *pas)
|
---|
593 | {
|
---|
594 | /* careful: we're after vfork! */
|
---|
595 | change_identity(pas); /* - initgroups, setgid, setuid */
|
---|
596 | if (chdir(pas->pw_dir) < 0) {
|
---|
597 | bb_error_msg("can't change directory to '%s'", pas->pw_dir);
|
---|
598 | xchdir(CRON_DIR);
|
---|
599 | }
|
---|
600 | }
|
---|
601 |
|
---|
602 | // TODO: sendmail should be _run-time_ option, not compile-time!
|
---|
603 | #if ENABLE_FEATURE_CROND_CALL_SENDMAIL
|
---|
604 |
|
---|
605 | static pid_t
|
---|
606 | fork_job(const char *user, int mailFd, CronLine *line, bool run_sendmail)
|
---|
607 | {
|
---|
608 | struct passwd *pas;
|
---|
609 | const char *shell, *prog;
|
---|
610 | smallint sv_logmode;
|
---|
611 | pid_t pid;
|
---|
612 |
|
---|
613 | /* prepare things before vfork */
|
---|
614 | pas = getpwnam(user);
|
---|
615 | if (!pas) {
|
---|
616 | bb_error_msg("can't get uid for %s", user);
|
---|
617 | goto err;
|
---|
618 | }
|
---|
619 |
|
---|
620 | shell = line->cl_shell ? line->cl_shell : DEFAULT_SHELL;
|
---|
621 | prog = run_sendmail ? SENDMAIL : shell;
|
---|
622 |
|
---|
623 | set_env_vars(pas, shell);
|
---|
624 |
|
---|
625 | sv_logmode = logmode;
|
---|
626 | pid = vfork();
|
---|
627 | if (pid == 0) {
|
---|
628 | /* CHILD */
|
---|
629 | /* initgroups, setgid, setuid, and chdir to home or CRON_DIR */
|
---|
630 | change_user(pas);
|
---|
631 | log5("child running %s", prog);
|
---|
632 | if (mailFd >= 0) {
|
---|
633 | xmove_fd(mailFd, run_sendmail ? 0 : 1);
|
---|
634 | dup2(1, 2);
|
---|
635 | }
|
---|
636 | /* crond 3.0pl1-100 puts tasks in separate process groups */
|
---|
637 | bb_setpgrp();
|
---|
638 | if (!run_sendmail)
|
---|
639 | execlp(prog, prog, "-c", line->cl_cmd, (char *) NULL);
|
---|
640 | else
|
---|
641 | execlp(prog, prog, SENDMAIL_ARGS, (char *) NULL);
|
---|
642 | /*
|
---|
643 | * I want this error message on stderr too,
|
---|
644 | * even if other messages go only to syslog:
|
---|
645 | */
|
---|
646 | logmode |= LOGMODE_STDIO;
|
---|
647 | bb_error_msg_and_die("can't execute '%s' for user %s", prog, user);
|
---|
648 | }
|
---|
649 | logmode = sv_logmode;
|
---|
650 |
|
---|
651 | if (pid < 0) {
|
---|
652 | bb_perror_msg("vfork");
|
---|
653 | err:
|
---|
654 | pid = 0;
|
---|
655 | } /* else: PARENT, FORK SUCCESS */
|
---|
656 |
|
---|
657 | /*
|
---|
658 | * Close the mail file descriptor.. we can't just leave it open in
|
---|
659 | * a structure, closing it later, because we might run out of descriptors
|
---|
660 | */
|
---|
661 | if (mailFd >= 0) {
|
---|
662 | close(mailFd);
|
---|
663 | }
|
---|
664 | return pid;
|
---|
665 | }
|
---|
666 |
|
---|
667 | static void start_one_job(const char *user, CronLine *line)
|
---|
668 | {
|
---|
669 | char mailFile[128];
|
---|
670 | int mailFd = -1;
|
---|
671 |
|
---|
672 | line->cl_pid = 0;
|
---|
673 | line->cl_empty_mail_size = 0;
|
---|
674 |
|
---|
675 | if (line->cl_mailto) {
|
---|
676 | /* Open mail file (owner is root so nobody can screw with it) */
|
---|
677 | snprintf(mailFile, sizeof(mailFile), "%s/cron.%s.%d", CRON_DIR, user, getpid());
|
---|
678 | mailFd = open(mailFile, O_CREAT | O_TRUNC | O_WRONLY | O_EXCL | O_APPEND, 0600);
|
---|
679 |
|
---|
680 | if (mailFd >= 0) {
|
---|
681 | fdprintf(mailFd, "To: %s\nSubject: cron: %s\n\n", line->cl_mailto,
|
---|
682 | line->cl_cmd);
|
---|
683 | line->cl_empty_mail_size = lseek(mailFd, 0, SEEK_CUR);
|
---|
684 | } else {
|
---|
685 | bb_error_msg("can't create mail file %s for user %s, "
|
---|
686 | "discarding output", mailFile, user);
|
---|
687 | }
|
---|
688 | }
|
---|
689 |
|
---|
690 | line->cl_pid = fork_job(user, mailFd, line, /*sendmail?*/ 0);
|
---|
691 | if (mailFd >= 0) {
|
---|
692 | if (line->cl_pid <= 0) {
|
---|
693 | unlink(mailFile);
|
---|
694 | } else {
|
---|
695 | /* rename mail-file based on pid of process */
|
---|
696 | char *mailFile2 = xasprintf("%s/cron.%s.%d", CRON_DIR, user, (int)line->cl_pid);
|
---|
697 | rename(mailFile, mailFile2); // TODO: xrename?
|
---|
698 | free(mailFile2);
|
---|
699 | }
|
---|
700 | }
|
---|
701 | }
|
---|
702 |
|
---|
703 | /*
|
---|
704 | * process_finished_job - called when job terminates and when mail terminates
|
---|
705 | */
|
---|
706 | static void process_finished_job(const char *user, CronLine *line)
|
---|
707 | {
|
---|
708 | pid_t pid;
|
---|
709 | int mailFd;
|
---|
710 | char mailFile[128];
|
---|
711 | struct stat sbuf;
|
---|
712 |
|
---|
713 | pid = line->cl_pid;
|
---|
714 | line->cl_pid = 0;
|
---|
715 | if (pid <= 0) {
|
---|
716 | /* No job */
|
---|
717 | return;
|
---|
718 | }
|
---|
719 | if (line->cl_empty_mail_size <= 0) {
|
---|
720 | /* End of job and no mail file, or end of sendmail job */
|
---|
721 | return;
|
---|
722 | }
|
---|
723 |
|
---|
724 | /*
|
---|
725 | * End of primary job - check for mail file.
|
---|
726 | * If size has changed and the file is still valid, we send it.
|
---|
727 | */
|
---|
728 | snprintf(mailFile, sizeof(mailFile), "%s/cron.%s.%d", CRON_DIR, user, (int)pid);
|
---|
729 | mailFd = open(mailFile, O_RDONLY);
|
---|
730 | unlink(mailFile);
|
---|
731 | if (mailFd < 0) {
|
---|
732 | return;
|
---|
733 | }
|
---|
734 |
|
---|
735 | if (fstat(mailFd, &sbuf) < 0
|
---|
736 | || sbuf.st_uid != DAEMON_UID
|
---|
737 | || sbuf.st_nlink != 0
|
---|
738 | || sbuf.st_size == line->cl_empty_mail_size
|
---|
739 | || !S_ISREG(sbuf.st_mode)
|
---|
740 | ) {
|
---|
741 | close(mailFd);
|
---|
742 | return;
|
---|
743 | }
|
---|
744 | line->cl_empty_mail_size = 0;
|
---|
745 | /* if (line->cl_mailto) - always true if cl_empty_mail_size was nonzero */
|
---|
746 | line->cl_pid = fork_job(user, mailFd, line, /*sendmail?*/ 1);
|
---|
747 | }
|
---|
748 |
|
---|
749 | #else /* !ENABLE_FEATURE_CROND_CALL_SENDMAIL */
|
---|
750 |
|
---|
751 | static void start_one_job(const char *user, CronLine *line)
|
---|
752 | {
|
---|
753 | const char *shell;
|
---|
754 | struct passwd *pas;
|
---|
755 | pid_t pid;
|
---|
756 |
|
---|
757 | pas = getpwnam(user);
|
---|
758 | if (!pas) {
|
---|
759 | bb_error_msg("can't get uid for %s", user);
|
---|
760 | goto err;
|
---|
761 | }
|
---|
762 |
|
---|
763 | /* Prepare things before vfork */
|
---|
764 | shell = line->cl_shell ? line->cl_shell : DEFAULT_SHELL;
|
---|
765 | set_env_vars(pas, shell);
|
---|
766 |
|
---|
767 | /* Fork as the user in question and run program */
|
---|
768 | pid = vfork();
|
---|
769 | if (pid == 0) {
|
---|
770 | /* CHILD */
|
---|
771 | /* initgroups, setgid, setuid, and chdir to home or CRON_DIR */
|
---|
772 | change_user(pas);
|
---|
773 | log5("child running %s", shell);
|
---|
774 | /* crond 3.0pl1-100 puts tasks in separate process groups */
|
---|
775 | bb_setpgrp();
|
---|
776 | execl(shell, shell, "-c", line->cl_cmd, (char *) NULL);
|
---|
777 | bb_error_msg_and_die("can't execute '%s' for user %s", shell, user);
|
---|
778 | }
|
---|
779 | if (pid < 0) {
|
---|
780 | bb_perror_msg("vfork");
|
---|
781 | err:
|
---|
782 | pid = 0;
|
---|
783 | }
|
---|
784 | line->cl_pid = pid;
|
---|
785 | }
|
---|
786 |
|
---|
787 | #define process_finished_job(user, line) ((line)->cl_pid = 0)
|
---|
788 |
|
---|
789 | #endif /* !ENABLE_FEATURE_CROND_CALL_SENDMAIL */
|
---|
790 |
|
---|
791 | /*
|
---|
792 | * Determine which jobs need to be run. Under normal conditions, the
|
---|
793 | * period is about a minute (one scan). Worst case it will be one
|
---|
794 | * hour (60 scans).
|
---|
795 | */
|
---|
796 | static void flag_starting_jobs(time_t t1, time_t t2)
|
---|
797 | {
|
---|
798 | time_t t;
|
---|
799 |
|
---|
800 | /* Find jobs > t1 and <= t2 */
|
---|
801 |
|
---|
802 | for (t = t1 - t1 % 60; t <= t2; t += 60) {
|
---|
803 | struct tm *ptm;
|
---|
804 | CronFile *file;
|
---|
805 | CronLine *line;
|
---|
806 |
|
---|
807 | if (t <= t1)
|
---|
808 | continue;
|
---|
809 |
|
---|
810 | ptm = localtime(&t);
|
---|
811 | for (file = G.cron_files; file; file = file->cf_next) {
|
---|
812 | log5("file %s:", file->cf_username);
|
---|
813 | if (file->cf_deleted)
|
---|
814 | continue;
|
---|
815 | for (line = file->cf_lines; line; line = line->cl_next) {
|
---|
816 | log5(" line %s", line->cl_cmd);
|
---|
817 | if (line->cl_Mins[ptm->tm_min]
|
---|
818 | && line->cl_Hrs[ptm->tm_hour]
|
---|
819 | && (line->cl_Days[ptm->tm_mday] || line->cl_Dow[ptm->tm_wday])
|
---|
820 | && line->cl_Mons[ptm->tm_mon]
|
---|
821 | ) {
|
---|
822 | log5(" job: %d %s",
|
---|
823 | (int)line->cl_pid, line->cl_cmd);
|
---|
824 | if (line->cl_pid > 0) {
|
---|
825 | log8("user %s: process already running: %s",
|
---|
826 | file->cf_username, line->cl_cmd);
|
---|
827 | } else if (line->cl_pid == 0) {
|
---|
828 | line->cl_pid = -1;
|
---|
829 | file->cf_wants_starting = 1;
|
---|
830 | }
|
---|
831 | }
|
---|
832 | }
|
---|
833 | }
|
---|
834 | }
|
---|
835 | }
|
---|
836 |
|
---|
837 | static void start_jobs(void)
|
---|
838 | {
|
---|
839 | CronFile *file;
|
---|
840 | CronLine *line;
|
---|
841 |
|
---|
842 | for (file = G.cron_files; file; file = file->cf_next) {
|
---|
843 | if (!file->cf_wants_starting)
|
---|
844 | continue;
|
---|
845 |
|
---|
846 | file->cf_wants_starting = 0;
|
---|
847 | for (line = file->cf_lines; line; line = line->cl_next) {
|
---|
848 | pid_t pid;
|
---|
849 | if (line->cl_pid >= 0)
|
---|
850 | continue;
|
---|
851 |
|
---|
852 | start_one_job(file->cf_username, line);
|
---|
853 | pid = line->cl_pid;
|
---|
854 | log8("USER %s pid %3d cmd %s",
|
---|
855 | file->cf_username, (int)pid, line->cl_cmd);
|
---|
856 | if (pid < 0) {
|
---|
857 | file->cf_wants_starting = 1;
|
---|
858 | }
|
---|
859 | if (pid > 0) {
|
---|
860 | file->cf_has_running = 1;
|
---|
861 | }
|
---|
862 | }
|
---|
863 | }
|
---|
864 | }
|
---|
865 |
|
---|
866 | /*
|
---|
867 | * Check for job completion, return number of jobs still running after
|
---|
868 | * all done.
|
---|
869 | */
|
---|
870 | static int check_completions(void)
|
---|
871 | {
|
---|
872 | CronFile *file;
|
---|
873 | CronLine *line;
|
---|
874 | int num_still_running = 0;
|
---|
875 |
|
---|
876 | for (file = G.cron_files; file; file = file->cf_next) {
|
---|
877 | if (!file->cf_has_running)
|
---|
878 | continue;
|
---|
879 |
|
---|
880 | file->cf_has_running = 0;
|
---|
881 | for (line = file->cf_lines; line; line = line->cl_next) {
|
---|
882 | int r;
|
---|
883 |
|
---|
884 | if (line->cl_pid <= 0)
|
---|
885 | continue;
|
---|
886 |
|
---|
887 | r = waitpid(line->cl_pid, NULL, WNOHANG);
|
---|
888 | if (r < 0 || r == line->cl_pid) {
|
---|
889 | process_finished_job(file->cf_username, line);
|
---|
890 | if (line->cl_pid == 0) {
|
---|
891 | /* sendmail was not started for it */
|
---|
892 | continue;
|
---|
893 | }
|
---|
894 | /* else: sendmail was started, job is still running, fall thru */
|
---|
895 | }
|
---|
896 | /* else: r == 0: "process is still running" */
|
---|
897 | file->cf_has_running = 1;
|
---|
898 | }
|
---|
899 | //FIXME: if !file->cf_has_running && file->deleted: delete it!
|
---|
900 | //otherwise deleted entries will stay forever, right?
|
---|
901 | num_still_running += file->cf_has_running;
|
---|
902 | }
|
---|
903 | return num_still_running;
|
---|
904 | }
|
---|
905 |
|
---|
906 | static void reopen_logfile_to_stderr(void)
|
---|
907 | {
|
---|
908 | if (G.log_filename) {
|
---|
909 | int logfd = open_or_warn(G.log_filename, O_WRONLY | O_CREAT | O_APPEND);
|
---|
910 | if (logfd >= 0)
|
---|
911 | xmove_fd(logfd, STDERR_FILENO);
|
---|
912 | }
|
---|
913 | }
|
---|
914 |
|
---|
915 | int crond_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
---|
916 | int crond_main(int argc UNUSED_PARAM, char **argv)
|
---|
917 | {
|
---|
918 | time_t t2;
|
---|
919 | unsigned rescan;
|
---|
920 | unsigned sleep_time;
|
---|
921 | unsigned opts;
|
---|
922 |
|
---|
923 | INIT_G();
|
---|
924 |
|
---|
925 | /* "-b after -f is ignored", and so on for every pair a-b */
|
---|
926 | opt_complementary = "f-b:b-f:S-L:L-S" IF_FEATURE_CROND_D(":d-l")
|
---|
927 | /* -l and -d have numeric param */
|
---|
928 | ":l+" IF_FEATURE_CROND_D(":d+");
|
---|
929 | opts = getopt32(argv, "l:L:fbSc:" IF_FEATURE_CROND_D("d:"),
|
---|
930 | &G.log_level, &G.log_filename, &G.crontab_dir_name
|
---|
931 | IF_FEATURE_CROND_D(,&G.log_level));
|
---|
932 | /* both -d N and -l N set the same variable: G.log_level */
|
---|
933 |
|
---|
934 | if (!(opts & OPT_f)) {
|
---|
935 | /* close stdin, stdout, stderr.
|
---|
936 | * close unused descriptors - don't need them. */
|
---|
937 | bb_daemonize_or_rexec(DAEMON_CLOSE_EXTRA_FDS, argv);
|
---|
938 | }
|
---|
939 |
|
---|
940 | if (!(opts & OPT_d) && G.log_filename == NULL) {
|
---|
941 | /* logging to syslog */
|
---|
942 | openlog(applet_name, LOG_CONS | LOG_PID, LOG_CRON);
|
---|
943 | logmode = LOGMODE_SYSLOG;
|
---|
944 | }
|
---|
945 |
|
---|
946 | //signal(SIGHUP, SIG_IGN); /* ? original crond dies on HUP... */
|
---|
947 |
|
---|
948 | reopen_logfile_to_stderr();
|
---|
949 | xchdir(G.crontab_dir_name);
|
---|
950 | log8("crond (busybox "BB_VER") started, log level %d", G.log_level);
|
---|
951 | rescan_crontab_dir();
|
---|
952 | write_pidfile(CONFIG_PID_FILE_PATH "/crond.pid");
|
---|
953 |
|
---|
954 | /* Main loop */
|
---|
955 | t2 = time(NULL);
|
---|
956 | rescan = 60;
|
---|
957 | sleep_time = 60;
|
---|
958 | for (;;) {
|
---|
959 | struct stat sbuf;
|
---|
960 | time_t t1;
|
---|
961 | long dt;
|
---|
962 |
|
---|
963 | /* Synchronize to 1 minute, minimum 1 second */
|
---|
964 | t1 = t2;
|
---|
965 | sleep(sleep_time - (time(NULL) % sleep_time));
|
---|
966 | t2 = time(NULL);
|
---|
967 | dt = (long)t2 - (long)t1;
|
---|
968 |
|
---|
969 | reopen_logfile_to_stderr();
|
---|
970 |
|
---|
971 | /*
|
---|
972 | * The file 'cron.update' is checked to determine new cron
|
---|
973 | * jobs. The directory is rescanned once an hour to deal
|
---|
974 | * with any screwups.
|
---|
975 | *
|
---|
976 | * Check for time jump. Disparities over an hour either way
|
---|
977 | * result in resynchronization. A negative disparity
|
---|
978 | * less than an hour causes us to effectively sleep until we
|
---|
979 | * match the original time (i.e. no re-execution of jobs that
|
---|
980 | * have just been run). A positive disparity less than
|
---|
981 | * an hour causes intermediate jobs to be run, but only once
|
---|
982 | * in the worst case.
|
---|
983 | *
|
---|
984 | * When running jobs, the inequality used is greater but not
|
---|
985 | * equal to t1, and less then or equal to t2.
|
---|
986 | */
|
---|
987 | if (stat(G.crontab_dir_name, &sbuf) != 0)
|
---|
988 | sbuf.st_mtime = 0; /* force update (once) if dir was deleted */
|
---|
989 | if (G.crontab_dir_mtime != sbuf.st_mtime) {
|
---|
990 | G.crontab_dir_mtime = sbuf.st_mtime;
|
---|
991 | rescan = 1;
|
---|
992 | }
|
---|
993 | if (--rescan == 0) {
|
---|
994 | rescan = 60;
|
---|
995 | rescan_crontab_dir();
|
---|
996 | }
|
---|
997 | process_cron_update_file();
|
---|
998 | log5("wakeup dt=%ld", dt);
|
---|
999 | if (dt < -60 * 60 || dt > 60 * 60) {
|
---|
1000 | bb_error_msg("time disparity of %ld minutes detected", dt / 60);
|
---|
1001 | /* and we do not run any jobs in this case */
|
---|
1002 | } else if (dt > 0) {
|
---|
1003 | /* Usual case: time advances forward, as expected */
|
---|
1004 | flag_starting_jobs(t1, t2);
|
---|
1005 | start_jobs();
|
---|
1006 | sleep_time = 60;
|
---|
1007 | if (check_completions() > 0) {
|
---|
1008 | /* some jobs are still running */
|
---|
1009 | sleep_time = 10;
|
---|
1010 | }
|
---|
1011 | }
|
---|
1012 | /* else: time jumped back, do not run any jobs */
|
---|
1013 | } /* for (;;) */
|
---|
1014 |
|
---|
1015 | return 0; /* not reached */
|
---|
1016 | }
|
---|