1 | /* |
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2 | * dhcpcd - DHCP client daemon |
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3 | * Copyright (c) 2006-2013 Roy Marples <roy@marples.name> |
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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 |
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7 | * are met: |
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8 | * 1. Redistributions of source code must retain the above copyright |
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9 | * notice, 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 | * |
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14 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
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15 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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16 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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17 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
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18 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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19 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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20 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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21 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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22 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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23 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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24 | * SUCH DAMAGE. |
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25 | */ |
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26 | |
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27 | #include <dirent.h> |
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28 | #include <dlfcn.h> |
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29 | #include <stdio.h> |
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30 | #include <stdlib.h> |
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31 | #include <string.h> |
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32 | #include <syslog.h> |
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33 | |
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34 | #include "common.h" |
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35 | #include "dev.h" |
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36 | #include "eloop.h" |
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37 | #include "dhcpcd.h" |
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38 | |
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39 | static struct dev *dev; |
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40 | static void *handle; |
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41 | static int fd = -1; |
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42 | |
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43 | static struct dev_dhcpcd dev_dhcpcd = { |
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44 | .handle_interface = &handle_interface |
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45 | }; |
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46 | |
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47 | int |
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48 | dev_initialized(const char *ifname) |
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49 | { |
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50 | |
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51 | if (dev == NULL) |
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52 | return 1; |
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53 | return dev->initialized(ifname); |
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54 | } |
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55 | |
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56 | int |
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57 | dev_listening(void) |
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58 | { |
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59 | |
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60 | if (dev == NULL) |
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61 | return 0; |
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62 | return dev->listening(); |
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63 | } |
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64 | |
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65 | void |
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66 | dev_stop(void) |
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67 | { |
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68 | |
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69 | if (dev) { |
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70 | syslog(LOG_DEBUG, "dev: unloaded %s", dev->name); |
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71 | dev->stop(); |
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72 | free(dev); |
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73 | dev = NULL; |
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74 | } |
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75 | if (handle) { |
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76 | dlclose(handle); |
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77 | handle = NULL; |
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78 | } |
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79 | } |
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80 | |
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81 | static int |
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82 | dev_start2(const char *name) |
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83 | { |
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84 | char file[PATH_MAX]; |
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85 | void *h; |
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86 | void (*fptr)(struct dev *, const struct dev_dhcpcd *); |
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87 | int r; |
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88 | |
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89 | snprintf(file, sizeof(file), DEVDIR "/%s", name); |
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90 | h = dlopen(file, RTLD_LAZY); |
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91 | if (h == NULL) { |
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92 | syslog(LOG_ERR, "dlopen: %s", dlerror()); |
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93 | return -1; |
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94 | } |
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95 | fptr = (void (*)(struct dev *, const struct dev_dhcpcd *)) |
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96 | dlsym(h, "dev_init"); |
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97 | if (fptr == NULL) { |
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98 | syslog(LOG_ERR, "dlsym: %s", dlerror()); |
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99 | dlclose(h); |
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100 | return -1; |
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101 | } |
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102 | dev = calloc(1, sizeof(*dev)); |
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103 | fptr(dev, &dev_dhcpcd); |
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104 | if (dev->start == NULL || (r = dev->start()) == -1) { |
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105 | free(dev); |
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106 | dev = NULL; |
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107 | dlclose(h); |
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108 | return -1; |
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109 | } |
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110 | syslog(LOG_INFO, "dev: loaded %s", dev->name); |
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111 | handle = h; |
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112 | return r; |
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113 | } |
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114 | |
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115 | static int |
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116 | dev_start1(const char *plugin) |
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117 | { |
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118 | DIR *dp; |
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119 | struct dirent *d; |
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120 | int r; |
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121 | |
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122 | if (dev) { |
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123 | syslog(LOG_ERR, "dev: already started %s", dev->name); |
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124 | return -1; |
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125 | } |
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126 | |
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127 | if (plugin) |
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128 | return dev_start2(plugin); |
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129 | |
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130 | dp = opendir(DEVDIR); |
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131 | if (dp == NULL) { |
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132 | syslog(LOG_DEBUG, "dev: %s: %m", DEVDIR); |
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133 | return 0; |
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134 | } |
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135 | |
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136 | r = 0; |
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137 | while ((d = readdir(dp))) { |
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138 | if (d->d_name[0] == '.') |
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139 | continue; |
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140 | |
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141 | r = dev_start2(d->d_name); |
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142 | if (r != -1) |
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143 | break; |
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144 | } |
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145 | closedir(dp); |
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146 | return r; |
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147 | } |
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148 | |
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149 | static void |
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150 | dev_handle_data(__unused void *arg) |
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151 | { |
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152 | |
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153 | if (dev->handle_device() == -1) { |
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154 | /* XXX: an error occured. should we restart dev? */ |
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155 | } |
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156 | } |
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157 | |
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158 | int |
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159 | dev_start(const char *plugin) |
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160 | { |
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161 | |
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162 | if (fd != -1) { |
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163 | syslog(LOG_ERR, "%s: already started on fd %d", __func__, fd); |
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164 | return fd; |
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165 | } |
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166 | |
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167 | fd = dev_start1(plugin); |
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168 | if (fd != -1) { |
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169 | if (eloop_event_add(fd, dev_handle_data, NULL) == -1) { |
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170 | syslog(LOG_ERR, "%s: eloop_event_add: %m", __func__); |
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171 | dev_stop(); |
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172 | return -1; |
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173 | } |
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174 | } |
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175 | |
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176 | return fd; |
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177 | } |
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