1 | /* |
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2 | * dhcpcd - DHCP client daemon |
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3 | * Copyright (c) 2006-2012 Roy Marples <roy@marples.name> |
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4 | * All rights reserved |
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5 | |
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6 | * Redistribution and use in source and binary forms, with or without |
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7 | * modification, are permitted provided that the following conditions |
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8 | * are met: |
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9 | * 1. Redistributions of source code must retain the above copyright |
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10 | * notice, this list of conditions and the following disclaimer. |
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11 | * 2. Redistributions in binary form must reproduce the above copyright |
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12 | * notice, this list of conditions and the following disclaimer in the |
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13 | * documentation and/or other materials provided with the distribution. |
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14 | * |
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15 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
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16 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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17 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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18 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
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19 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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20 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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21 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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22 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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23 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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24 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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25 | * SUCH DAMAGE. |
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26 | */ |
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27 | |
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28 | #include <sys/stat.h> |
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29 | #include <sys/un.h> |
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30 | |
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31 | #include <errno.h> |
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32 | #include <stdio.h> |
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33 | #include <stdlib.h> |
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34 | #include <string.h> |
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35 | #include <time.h> |
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36 | #include <unistd.h> |
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37 | |
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38 | #include "config.h" |
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39 | #include "common.h" |
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40 | #include "dhcpcd.h" |
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41 | #include "control.h" |
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42 | #include "eloop.h" |
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43 | |
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44 | static int fd = -1; |
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45 | static char buffer[1024]; |
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46 | static char *argvp[255]; |
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47 | |
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48 | static struct sockaddr_un sun; |
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49 | struct fd_list *control_fds = NULL; |
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50 | |
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51 | #ifdef DEBUG_MEMORY |
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52 | static void |
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53 | cleanup(void) |
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54 | { |
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55 | struct fd_list *f; |
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56 | |
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57 | f = control_fds; |
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58 | while (f) { |
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59 | control_fds = f->next; |
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60 | free(f); |
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61 | f = control_fds; |
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62 | } |
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63 | } |
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64 | #endif |
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65 | |
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66 | static void |
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67 | control_remove(void *arg) |
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68 | { |
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69 | struct fd_list *l, *n, *last = NULL; |
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70 | |
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71 | l = control_fds; |
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72 | while (l) { |
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73 | n = l->next; |
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74 | if (l == arg) { |
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75 | close(l->fd); |
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76 | eloop_event_delete(l->fd); |
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77 | if (last == NULL) |
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78 | control_fds = l->next; |
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79 | else |
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80 | last->next = l->next; |
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81 | free(l); |
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82 | break; |
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83 | } |
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84 | last = l; |
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85 | l = n; |
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86 | } |
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87 | } |
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88 | |
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89 | static void |
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90 | control_handle_data(void *arg) |
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91 | { |
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92 | struct fd_list *l = arg; |
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93 | ssize_t bytes; |
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94 | int argc; |
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95 | char *e, *p; |
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96 | char **ap; |
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97 | |
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98 | bytes = read(l->fd, buffer, sizeof(buffer) - 1); |
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99 | if (bytes == -1 || bytes == 0) { |
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100 | control_remove(l); |
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101 | return; |
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102 | } |
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103 | buffer[bytes] = '\0'; |
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104 | p = buffer; |
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105 | e = buffer + bytes; |
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106 | argc = 0; |
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107 | ap = argvp; |
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108 | while (p < e && (size_t)argc < sizeof(argvp)) { |
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109 | argc++; |
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110 | *ap++ = p; |
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111 | p += strlen(p) + 1; |
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112 | } |
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113 | handle_args(l, argc, argvp); |
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114 | } |
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115 | |
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116 | /* ARGSUSED */ |
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117 | static void |
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118 | control_handle(__unused void *arg) |
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119 | { |
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120 | struct sockaddr_un run; |
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121 | socklen_t len; |
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122 | struct fd_list *l; |
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123 | int f; |
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124 | |
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125 | len = sizeof(run); |
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126 | if ((f = accept(fd, (struct sockaddr *)&run, &len)) == -1) |
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127 | return; |
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128 | set_cloexec(f); |
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129 | l = malloc(sizeof(*l)); |
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130 | if (l) { |
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131 | l->fd = f; |
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132 | l->listener = 0; |
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133 | l->next = control_fds; |
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134 | control_fds = l; |
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135 | eloop_event_add(l->fd, control_handle_data, l); |
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136 | } |
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137 | } |
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138 | |
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139 | static int |
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140 | make_sock(void) |
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141 | { |
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142 | if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) |
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143 | return -1; |
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144 | memset(&sun, 0, sizeof(sun)); |
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145 | sun.sun_family = AF_UNIX; |
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146 | strlcpy(sun.sun_path, CONTROLSOCKET, sizeof(sun.sun_path)); |
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147 | return sizeof(sun.sun_family) + strlen(sun.sun_path) + 1; |
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148 | } |
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149 | |
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150 | int |
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151 | control_start(void) |
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152 | { |
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153 | int len; |
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154 | |
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155 | if ((len = make_sock()) == -1) |
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156 | return -1; |
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157 | unlink(CONTROLSOCKET); |
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158 | if (bind(fd, (struct sockaddr *)&sun, len) == -1 || |
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159 | chmod(CONTROLSOCKET, |
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160 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP) == -1 || |
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161 | set_cloexec(fd) == -1 || |
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162 | set_nonblock(fd) == -1 || |
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163 | listen(fd, sizeof(control_fds)) == -1) |
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164 | { |
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165 | close(fd); |
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166 | return -1; |
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167 | } |
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168 | eloop_event_add(fd, control_handle, NULL); |
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169 | return fd; |
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170 | } |
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171 | |
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172 | int |
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173 | control_stop(void) |
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174 | { |
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175 | int retval = 0; |
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176 | struct fd_list *l; |
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177 | |
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178 | eloop_event_delete(fd); |
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179 | if (shutdown(fd, SHUT_RDWR) == -1) |
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180 | retval = 1; |
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181 | fd = -1; |
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182 | if (unlink(CONTROLSOCKET) == -1) |
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183 | retval = -1; |
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184 | |
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185 | l = control_fds; |
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186 | while (l != NULL) { |
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187 | control_fds = l->next; |
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188 | eloop_event_delete(l->fd); |
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189 | shutdown(l->fd, SHUT_RDWR); |
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190 | free(l); |
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191 | l = control_fds; |
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192 | } |
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193 | |
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194 | return retval; |
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195 | } |
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196 | |
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197 | int |
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198 | control_open(void) |
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199 | { |
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200 | int len; |
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201 | |
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202 | if ((len = make_sock()) == -1) |
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203 | return -1; |
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204 | #ifdef DEBUG_MEMORY |
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205 | atexit(cleanup); |
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206 | #endif |
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207 | return connect(fd, (struct sockaddr *)&sun, len); |
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208 | } |
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209 | |
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210 | int |
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211 | control_send(int argc, char * const *argv) |
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212 | { |
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213 | char *p = buffer; |
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214 | int i; |
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215 | size_t len; |
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216 | |
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217 | if (argc > 255) { |
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218 | errno = ENOBUFS; |
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219 | return -1; |
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220 | } |
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221 | for (i = 0; i < argc; i++) { |
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222 | len = strlen(argv[i]) + 1; |
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223 | if ((p - buffer) + len > sizeof(buffer)) { |
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224 | errno = ENOBUFS; |
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225 | return -1; |
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226 | } |
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227 | memcpy(p, argv[i], len); |
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228 | p += len; |
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229 | } |
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230 | return write(fd, buffer, p - buffer); |
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231 | } |
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