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annotate proc.c @ 33:fa93d2ff9c62

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Prevent potential division by zero Add safeguard ensuring that there is at least one possible character to generate passwords from in order to exclude the possibility of a division by zero error in rand_uniform.
author Guido Berhoerster <guido+pwm@berhoerster.name>
date Tue, 30 Jul 2019 20:38:08 +0200
parents 5c6155c8e9b6
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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19
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1 /*
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2 * Copyright (C) 2017 Guido Berhoerster <guido+pwm@berhoerster.name>
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3 *
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4 * Permission is hereby granted, free of charge, to any person obtaining
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5 * a copy of this software and associated documentation files (the
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6 * "Software"), to deal in the Software without restriction, including
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7 * without limitation the rights to use, copy, modify, merge, publish,
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8 * distribute, sublicense, and/or sell copies of the Software, and to
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9 * permit persons to whom the Software is furnished to do so, subject to
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10 * the following conditions:
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11 *
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12 * The above copyright notice and this permission notice shall be included
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13 * in all copies or substantial portions of the Software.
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14 *
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15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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16 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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17 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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18 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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19 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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20 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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21 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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22 */
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23
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24 #include "compat.h"
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25
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26 #ifdef HAVE_ERR_H
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27 #include <err.h>
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28 #endif /* HAVE_ERR_H */
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29 #include <errno.h>
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30 #include <setjmp.h>
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31 #include <signal.h>
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32 #include <string.h>
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33 #include <sys/wait.h>
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34 #include <unistd.h>
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35
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36 #include "util.h"
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37 #include "proc.h"
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38 #include "pwm.h"
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39
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40 #define PIPE_R 0
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41 #define PIPE_W 1
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42
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43 static sigjmp_buf signal_env;
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44
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45 static void
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46 signal_handler(int signal_no)
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47 {
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48 siglongjmp(signal_env, signal_no);
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49 }
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50
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51 enum io_status
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52 proc_open(struct proc *proc, const char *command, const char *type)
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53 {
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54 int pipe_fds[2];
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55 pid_t pid;
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56
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57 if ((strlen(type) != 1) || ((*type != 'r') && (*type != 'w'))) {
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58 return (IO_ERROR);
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59 }
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60
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61 if (pipe(pipe_fds) < 0) {
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62 return (IO_ERROR);
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63 }
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64
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65 switch (pid = fork()) {
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66 case -1:
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67 return (IO_ERROR);
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68 case 0:
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69 if (*type == 'r') {
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70 close(pipe_fds[PIPE_R]);
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71 dup2(pipe_fds[PIPE_W], STDOUT_FILENO);
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72 } else {
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73 close(pipe_fds[PIPE_W]);
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74 dup2(pipe_fds[PIPE_R], STDIN_FILENO);
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75 }
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76 closefrom(STDERR_FILENO + 1);
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77 execlp("sh", "sh", "-c", command, (char *)0);
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78 err(1, "execlp");
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79 default:
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80 if (*type == 'r') {
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81 close(pipe_fds[PIPE_W]);
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82 proc->fd = pipe_fds[PIPE_R];
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83 } else {
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84 close(pipe_fds[PIPE_R]);
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85 proc->fd = pipe_fds[PIPE_W];
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86 }
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87 proc->pid = pid;
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88 return (IO_OK);
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89 }
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90 }
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91
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92 enum io_status
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93 proc_close(struct proc *proc)
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94 {
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95 struct sigaction action;
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96 struct sigaction oaction;
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97 int signal_no = 0;
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98 pid_t wpid;
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99 int status;
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100
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101 close(proc->fd);
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102
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103 /* install signal handlers */
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104 action.sa_handler = signal_handler;
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105 action.sa_flags = 0;
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106 sigemptyset(&action.sa_mask);
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107 sigaddset(&action.sa_mask, SIGINT);
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108 sigaddset(&action.sa_mask, SIGTERM);
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109 sigaddset(&action.sa_mask, SIGHUP);
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110 sigaddset(&action.sa_mask, SIGQUIT);
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111 if ((sigaction(SIGINT, &action, &oaction) != 0) ||
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112 (sigaction(SIGTERM, &action, &oaction) != 0) ||
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113 (sigaction(SIGHUP, &action, &oaction) != 0) ||
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114 (sigaction(SIGQUIT, &action, &oaction) != 0)) {
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115 err(1, "sigaction");
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116 }
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117
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118 if ((signal_no = sigsetjmp(signal_env, 1)) != 0) {
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119 /*
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120 * signal received, signal mask has been restored, send SIGTERM
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121 * to the child process, wait 500 ms and send a SIGKILL if the
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122 * child still exists
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123 */
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124 kill(proc->pid, SIGTERM);
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125 nanosleep(&(struct timespec){ .tv_nsec = 500 * 1000 * 1000 },
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126 NULL);
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127 do {
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128 wpid = waitpid(proc->pid, &status, WNOHANG);
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129 } while ((wpid == -1) && (errno == EINTR));
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130 if (wpid == proc->pid) {
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131 goto out;
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132 }
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133
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134 kill(proc->pid, SIGKILL);
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135 do {
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136 wpid = waitpid(proc->pid, &status, 0);
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137 } while ((wpid == -1) && (errno == EINTR));
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138
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139 goto out;
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140 }
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141
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142 pwm_unblock_signals();
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143 do {
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144 wpid = waitpid(proc->pid, &status, 0);
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145 } while ((wpid == -1) && (errno == EINTR));
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146 pwm_block_signals();
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147
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148 out:
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149 /* restore signal handlers */
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150 if ((sigaction(SIGINT, &oaction, NULL) != 0) ||
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151 (sigaction(SIGTERM, &oaction, NULL) != 0) ||
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152 (sigaction(SIGHUP, &oaction, NULL) != 0) ||
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153 (sigaction(SIGQUIT, &oaction, NULL) != 0)) {
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154 err(1, "sigaction");
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155 }
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156
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157 proc->fd = -1;
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158 proc->pid = (pid_t)-1;
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159
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160 return ((signal_no == 0) ? IO_OK : IO_SIGNAL);
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161 }