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Rev | Author | Line No. | Line |
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1140 | dev | 1 | /****************************************************************** |
1159 | dev | 2 | * rebootd. |
1140 | dev | 3 | * |
1168 | dev | 4 | * A daemon which waits on specified UDP port for special string |
1159 | dev | 5 | * (password) and reboots the computer. |
1140 | dev | 6 | * |
1164 | dev | 7 | * Command line: rebootd [--version] [--help] [--interface IP] [--port PORT] [--config CONFIG_FILE] |
1159 | dev | 8 | * Defaults are port 19 and config /etc/rebootd.conf. |
1140 | dev | 9 | * |
10 | * Config file looks like: |
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11 | * -------------------------- |
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1164 | dev | 12 | * interface=192.168.0.1 |
1140 | dev | 13 | * port=19 |
14 | * password="some password" |
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15 | * -------------------------- |
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16 | * |
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17 | * Usage example (from any other host): |
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1168 | dev | 18 | * echo -n "some password" | nc -uo host_to_rebot 19 |
1140 | dev | 19 | * |
20 | * Copyleft 2005 Anatoli Klassen |
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21 | * |
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22 | ******************************************************************/ |
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23 | |||
24 | #include <stdlib.h> |
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25 | #include <stdio.h> |
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26 | #include <string.h> |
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27 | #include <stdarg.h> |
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1144 | dev | 28 | #include <ctype.h> |
1140 | dev | 29 | #include <errno.h> |
30 | #include <signal.h> |
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31 | #include <unistd.h> |
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32 | #include <netdb.h> |
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33 | #include <syslog.h> |
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1165 | dev | 34 | #include <signal.h> |
35 | #include <fcntl.h> |
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1140 | dev | 36 | #include <sys/types.h> |
1144 | dev | 37 | #include <sys/stat.h> |
1140 | dev | 38 | #include <sys/socket.h> |
39 | #include <sys/wait.h> |
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40 | #include <sys/reboot.h> |
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41 | #include <netinet/in.h> |
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42 | #include <arpa/inet.h> |
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43 | |||
1145 | dev | 44 | /* name version number */ |
1159 | dev | 45 | #define APP_NAME "rebootd" |
1145 | dev | 46 | #define VERSION "1.0" |
47 | #define REVISION "$Rev: 1168 $" |
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1144 | dev | 48 | |
1145 | dev | 49 | #define DEFAULT_PORT 19 |
1159 | dev | 50 | #define DEFAULT_CFG_FILE "/etc/rebootd.conf" |
1145 | dev | 51 | #define CMDSIZE 4096 |
52 | #define BUFSIZE 4096 |
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53 | #define MAX_CONFIG_LINE 4096 |
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54 | #define PORT_MIN 1 |
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55 | #define PORT_MAX 65535 |
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1140 | dev | 56 | |
1145 | dev | 57 | /* return values of functions */ |
58 | #define RESULT_OK 0 |
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59 | #define RESULT_EXIT 1 |
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60 | #define RESULT_ERROR 2 |
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61 | #define RESULT_UNEXPECTED 3 |
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1140 | dev | 62 | |
1145 | dev | 63 | /* return values for the whole program */ |
64 | #define EXIT_OK 0 |
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65 | #define EXIT_USER_ERROR 1 |
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66 | #define EXIT_UNEXPECTED 2 |
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67 | |||
68 | /* command line and config file parameters */ |
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69 | #define PARAM_HELP_1 "-h" |
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70 | #define PARAM_HELP_2 "--help" |
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1165 | dev | 71 | #define PARAM_VERSION "--version" |
72 | #define PARAM_INTERFACE "--interface" |
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73 | #define PARAM_PORT "--port" |
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74 | #define PARAM_CONFIG "--config" |
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75 | #define PARAM_PID_FILE "--pid" |
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1164 | dev | 76 | #define CONFIG_INTERFACE "interface" |
1145 | dev | 77 | #define CONFIG_PORT "port" |
78 | #define CONFIG_PASSWORD "password" |
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1165 | dev | 79 | #define CONFIG_PID_FILE "pid" |
1145 | dev | 80 | |
1165 | dev | 81 | /* priority of defferent sources of options */ |
82 | #define CFG_PRIO_CMD 1 |
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83 | #define CFG_PRIO_CONFIG 2 |
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84 | #define CFG_PRIO_DEFAULT 3 |
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85 | |||
1140 | dev | 86 | struct config { |
1164 | dev | 87 | char config_file[FILENAME_MAX]; |
1165 | dev | 88 | char config_file_prio; |
1164 | dev | 89 | struct in_addr interface; |
1165 | dev | 90 | char interface_prio; |
1164 | dev | 91 | ushort port; |
1165 | dev | 92 | char port_prio; |
1164 | dev | 93 | char password[MAX_CONFIG_LINE]; |
1165 | dev | 94 | char password_prio; |
95 | char pid_file[FILENAME_MAX]; |
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96 | char pid_file_prio; |
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1140 | dev | 97 | }; |
1165 | dev | 98 | |
99 | static struct config global_cfg; |
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100 | static int daemonized = 0; /* we are already a daemon */ |
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101 | volatile static int reconfig_needed = 0; /* we have to stop socket listening and reread config */ |
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1140 | dev | 102 | |
1163 | dev | 103 | static int parse_cmd_line(struct config *cfg, int argc, const char* argv[]); |
104 | static int parse_config_file(struct config *cfg, const char *config_name); |
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1156 | dev | 105 | static int get_revision(void); |
1165 | dev | 106 | static void check_return(int res); |
1140 | dev | 107 | |
1156 | dev | 108 | static uint min(uint a, uint b) |
1140 | dev | 109 | { |
110 | return (a < b) ? a : b; |
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111 | } |
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112 | |||
1164 | dev | 113 | static int establish(const struct config *cfg) |
1140 | dev | 114 | { |
115 | int s; |
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116 | struct sockaddr_in sa; |
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117 | |||
118 | memset(&sa, 0, sizeof(struct sockaddr_in)); |
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119 | |||
120 | sa.sin_family = AF_INET; |
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1164 | dev | 121 | sa.sin_port = htons(cfg->port); |
122 | sa.sin_addr.s_addr = (cfg->interface.s_addr ? cfg->interface.s_addr : INADDR_ANY); |
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1140 | dev | 123 | |
1168 | dev | 124 | if((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) |
1140 | dev | 125 | return -1; |
126 | |||
127 | if(bind(s, (struct sockaddr *)&sa, sizeof(struct sockaddr_in)) < 0) { |
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128 | close(s); |
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129 | return -1; |
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130 | } |
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131 | |||
132 | return s; |
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133 | } |
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134 | |||
1156 | dev | 135 | static void listen_socket(const struct config *cfg, int soc) |
1142 | dev | 136 | { |
1168 | dev | 137 | char buf[BUFSIZE]; |
138 | int br; |
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139 | struct sockaddr_storage ss; |
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140 | socklen_t ss_size; |
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1142 | dev | 141 | |
142 | for(;;) { |
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1168 | dev | 143 | ss_size = sizeof(ss); |
144 | br = recvfrom(soc, buf, sizeof(buf)-1, 0, (struct sockaddr *)&ss, &ss_size); |
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145 | |||
146 | if(br == 0) { |
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147 | if(reconfig_needed) return; |
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1142 | dev | 148 | continue; |
149 | } |
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1168 | dev | 150 | else if(br < 0) { |
151 | syslog(LOG_INFO, "cannot receive: %s", strerror(errno)); |
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152 | continue; |
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153 | } |
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1142 | dev | 154 | |
1168 | dev | 155 | buf[br] = '\0'; |
1142 | dev | 156 | sleep(1); |
1147 | dev | 157 | syslog(LOG_INFO, "got command"); |
1142 | dev | 158 | |
1168 | dev | 159 | if(0 == strncmp(buf, cfg->password, sizeof(buf))) { |
1142 | dev | 160 | syslog(LOG_EMERG, "REBOOT"); |
161 | sleep(5); |
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162 | if(reboot(RB_AUTOBOOT) < 0) { |
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1168 | dev | 163 | syslog(LOG_ERR, "cannot reboot, %s", strerror(errno)); |
1142 | dev | 164 | } |
165 | } |
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166 | } |
||
167 | } |
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168 | |||
1156 | dev | 169 | static void print_version(void) |
1140 | dev | 170 | { |
1145 | dev | 171 | printf("%s %s.%d\n", APP_NAME, VERSION, get_revision()); |
172 | } |
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173 | |||
1156 | dev | 174 | static void pring_usage(int argc, const char* argv[]) |
1145 | dev | 175 | { |
176 | print_version(); |
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1168 | dev | 177 | printf("\nA daemon which waits on specified UDP port for special"); |
1159 | dev | 178 | printf(" string (password) and reboots the computer.\n\n"); |
1164 | dev | 179 | printf("Usage: %s [--interface IP] [--port PORT] [--config CONFIG_FILE]\n", argv[0]); |
1145 | dev | 180 | printf(" or: %s --version\n", argv[0]); |
181 | printf(" or: %s --help\n\n", argv[0]); |
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1159 | dev | 182 | printf("Defaults are port 19 and config /etc/rebootd.conf.\n\n"); |
1145 | dev | 183 | printf("Config file looks like:\n--------------------------\n"); |
1164 | dev | 184 | printf("interface=192.168.0.1\nport=19\npassword=\"some password\"\n--------------------------\n\n"); |
1168 | dev | 185 | printf("Then run from any other host:\necho -n \"some password\" | nc -uo host_to_rebot 19\n"); |
1145 | dev | 186 | } |
187 | |||
1165 | dev | 188 | static int print_error(const char *msg, const char *value) |
189 | { |
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190 | if(daemonized) { |
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191 | syslog(LOG_ERR, "%s", msg); |
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192 | if(value) syslog(LOG_ERR, " - %s\n", value); |
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193 | syslog(LOG_ERR, "\n"); |
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194 | } |
||
195 | else { |
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196 | fprintf(stderr, "%s", msg); |
||
197 | if(value) fprintf(stderr, " - %s\n", value); |
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198 | fprintf(stderr, "\n"); |
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199 | } |
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200 | |||
201 | return RESULT_ERROR; |
||
202 | } |
||
203 | |||
1156 | dev | 204 | static int print_cmd_error(int argc, const char* argv[], const char *msg, const char *value) |
1145 | dev | 205 | { |
1140 | dev | 206 | fprintf(stderr, "%s", msg); |
207 | if(value) fprintf(stderr, " - %s\n", value); |
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208 | fprintf(stderr, "\n"); |
||
209 | |||
1145 | dev | 210 | pring_usage(argc, argv); |
211 | |||
212 | return RESULT_ERROR; |
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1140 | dev | 213 | } |
214 | |||
1156 | dev | 215 | static int print_config_error(const char *config_name, int line, const char *msg, const char *value) |
1140 | dev | 216 | { |
1165 | dev | 217 | if(daemonized) { |
218 | syslog(LOG_ERR, "Error in %s, line %d: %s", config_name, line, msg); |
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219 | if(value) syslog(LOG_ERR, " - %s", value); |
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220 | syslog(LOG_ERR, "\n"); |
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221 | } |
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222 | else { |
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223 | fprintf(stderr, "Error in %s, line %d: %s", config_name, line, msg); |
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224 | if(value) fprintf(stderr, " - %s", value); |
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225 | fprintf(stderr, "\n"); |
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226 | } |
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1140 | dev | 227 | |
1145 | dev | 228 | return RESULT_ERROR; |
1140 | dev | 229 | } |
230 | |||
1165 | dev | 231 | static int check_abs_path(const char *file_name) |
232 | { |
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233 | if(file_name && file_name[0] != '\0' && file_name[0] != '/') { |
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234 | return print_error("File must have an absolute path", file_name); |
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235 | } |
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236 | |||
237 | return RESULT_OK; |
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238 | } |
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239 | |||
1156 | dev | 240 | static int read_config(struct config *cfg, int argc, const char* argv[]) |
1140 | dev | 241 | { |
1165 | dev | 242 | int res_cmd_line; |
243 | int res_config_file; |
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1163 | dev | 244 | struct config cmd_cfg; |
245 | struct config file_cfg; |
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1140 | dev | 246 | |
1164 | dev | 247 | memset(cfg, 0, sizeof(struct config)); |
1163 | dev | 248 | res_cmd_line = parse_cmd_line(&cmd_cfg, argc, argv); |
1145 | dev | 249 | if(res_cmd_line != RESULT_OK) return res_cmd_line; |
1165 | dev | 250 | if(check_abs_path(cmd_cfg.config_file) != RESULT_OK) return RESULT_ERROR; |
1140 | dev | 251 | |
1163 | dev | 252 | res_config_file = parse_config_file(&file_cfg, |
253 | cmd_cfg.config_file[0] != '\0' ? cmd_cfg.config_file : DEFAULT_CFG_FILE); |
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1145 | dev | 254 | if(res_config_file != RESULT_OK) return res_config_file; |
1140 | dev | 255 | |
1165 | dev | 256 | if(file_cfg.password[0] == '\0') |
257 | return print_error("Password is not set", NULL); |
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258 | |||
259 | /* save parsed values to general config */ |
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260 | if(cmd_cfg.config_file[0] != '\0') { |
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261 | strncpy(cfg->config_file, cmd_cfg.config_file, sizeof(cfg->config_file)); |
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262 | cfg->config_file_prio = CFG_PRIO_CMD; |
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1140 | dev | 263 | } |
1165 | dev | 264 | else { |
265 | strncpy(cfg->config_file, DEFAULT_CFG_FILE, sizeof(cfg->config_file)); |
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266 | cfg->config_file_prio = CFG_PRIO_DEFAULT; |
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267 | } |
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1140 | dev | 268 | |
1165 | dev | 269 | if(cmd_cfg.interface.s_addr) { |
270 | cfg->interface = cmd_cfg.interface; |
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271 | cfg->interface_prio = CFG_PRIO_CMD; |
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272 | } |
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273 | else if(file_cfg.interface.s_addr) { |
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274 | cfg->interface = file_cfg.interface; |
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275 | cfg->interface_prio = CFG_PRIO_CONFIG; |
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276 | } |
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277 | else { |
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278 | cfg->interface_prio = CFG_PRIO_DEFAULT; |
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279 | } |
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280 | |||
281 | if(cmd_cfg.port) { |
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282 | cfg->port = cmd_cfg.port; |
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283 | cfg->port_prio = CFG_PRIO_CMD; |
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284 | } |
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285 | else if(file_cfg.port) { |
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286 | cfg->port = file_cfg.port; |
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287 | cfg->port_prio = CFG_PRIO_CONFIG; |
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288 | } |
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289 | else { |
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290 | cfg->port = DEFAULT_PORT; |
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291 | cfg->port_prio = CFG_PRIO_DEFAULT; |
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292 | } |
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293 | |||
294 | if(cmd_cfg.pid_file[0] != '\0') { |
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295 | strncpy(cfg->pid_file, cmd_cfg.pid_file, sizeof(cfg->pid_file)); |
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296 | cfg->pid_file_prio = CFG_PRIO_CMD; |
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297 | } |
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298 | else if(file_cfg.pid_file[0] != '\0') { |
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299 | strncpy(cfg->pid_file, file_cfg.pid_file, sizeof(cfg->pid_file)); |
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300 | cfg->pid_file_prio = CFG_PRIO_CONFIG; |
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301 | } |
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302 | else { |
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303 | cfg->pid_file_prio = CFG_PRIO_DEFAULT; |
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304 | } |
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305 | if(check_abs_path(cfg->config_file) != RESULT_OK) return RESULT_ERROR; |
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306 | |||
307 | strncpy(cfg->password, file_cfg.password, sizeof(cfg->password)); |
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308 | cfg->password_prio = CFG_PRIO_CONFIG; |
||
309 | |||
310 | return RESULT_OK; |
||
311 | } |
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312 | |||
313 | static int reread_config(struct config *cfg, int *reinit_needed) |
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314 | { |
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315 | int res_config_file; |
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316 | struct config file_cfg; |
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317 | |||
318 | *reinit_needed = 0; |
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319 | |||
320 | res_config_file = parse_config_file(&file_cfg, cfg->config_file); |
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321 | if(res_config_file != RESULT_OK) return res_config_file; |
||
322 | |||
323 | if(file_cfg.password[0] == '\0') |
||
324 | return print_error("Password is not set", NULL); |
||
325 | |||
1163 | dev | 326 | /* save parsed values to general config */ |
1165 | dev | 327 | if(cfg->interface_prio >= CFG_PRIO_CONFIG && cfg->interface.s_addr != file_cfg.interface.s_addr) |
328 | { |
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329 | *reinit_needed = 1; |
||
330 | cfg->interface = file_cfg.interface; |
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331 | cfg->interface_prio = CFG_PRIO_CONFIG; |
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332 | } |
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1163 | dev | 333 | |
1165 | dev | 334 | if(cfg->port_prio >= CFG_PRIO_CONFIG && cfg->port != file_cfg.port && file_cfg.port) { |
335 | *reinit_needed = 1; |
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336 | cfg->port = file_cfg.port; |
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337 | cfg->port_prio = CFG_PRIO_CONFIG; |
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338 | } |
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1164 | dev | 339 | |
1165 | dev | 340 | if(check_abs_path(cfg->config_file) != RESULT_OK) return RESULT_ERROR; |
1140 | dev | 341 | |
1163 | dev | 342 | strncpy(cfg->password, file_cfg.password, sizeof(cfg->password)); |
1165 | dev | 343 | cfg->password_prio = CFG_PRIO_CONFIG; |
1163 | dev | 344 | |
1145 | dev | 345 | return RESULT_OK; |
1140 | dev | 346 | } |
347 | |||
1164 | dev | 348 | static int parse_interface(const char *s, char **end, struct in_addr *ip) |
349 | { |
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350 | char buf[MAX_CONFIG_LINE]; |
||
351 | int count; |
||
352 | const char *c; |
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353 | |||
354 | c = s; |
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355 | count = 0; |
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356 | while(c[0] != '\0' && !isspace(c[0])) c++, count++; |
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357 | if(count > MAX_CONFIG_LINE) return RESULT_ERROR; |
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358 | strncpy(buf, s, count); |
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359 | buf[count] = '\0'; |
||
360 | c++; |
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361 | |||
362 | if(end) *end = (char *)c; |
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363 | |||
364 | if(inet_aton(buf, ip) == 1) |
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365 | return RESULT_OK; |
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366 | else |
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367 | return RESULT_ERROR; |
||
368 | } |
||
369 | |||
1163 | dev | 370 | static int parse_cmd_line(struct config *cfg, int argc, const char* argv[]) |
1140 | dev | 371 | { |
372 | char *end; |
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373 | int i; |
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1163 | dev | 374 | long port; |
1140 | dev | 375 | |
1163 | dev | 376 | memset(cfg, 0, sizeof(struct config)); |
1140 | dev | 377 | |
378 | for(i = 1; i < argc; i++) { |
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1165 | dev | 379 | if(0 == strcmp(argv[i], PARAM_INTERFACE)) { |
1164 | dev | 380 | if(cfg->interface.s_addr) |
381 | return print_cmd_error(argc, argv, "Interface is already set", NULL); |
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382 | |||
383 | if(++i < argc) { |
||
384 | if(parse_interface(argv[i], (char **)NULL, &cfg->interface) != RESULT_OK) |
||
385 | return print_cmd_error(argc, argv, |
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386 | "Cannot parse interface", argv[i]); |
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387 | } |
||
388 | else { |
||
389 | return print_cmd_error(argc, argv, "Interface expected", NULL); |
||
390 | } |
||
391 | } |
||
1165 | dev | 392 | else if(0 == strcmp(argv[i], PARAM_PORT)) { |
1164 | dev | 393 | if(cfg->port) |
1145 | dev | 394 | return print_cmd_error(argc, argv, "Port is already set", NULL); |
1140 | dev | 395 | |
396 | if(++i < argc) { |
||
1163 | dev | 397 | port = strtol(argv[i], &end, 10); |
398 | if(*end != '\0' || port < PORT_MIN || port > PORT_MAX) |
||
1145 | dev | 399 | return print_cmd_error(argc, argv, |
400 | "Port number must be integer between 1 and 65535", NULL); |
||
1163 | dev | 401 | cfg->port = (ushort)port; |
1140 | dev | 402 | } |
403 | else { |
||
1145 | dev | 404 | return print_cmd_error(argc, argv, "Port number expected", NULL); |
1140 | dev | 405 | } |
406 | } |
||
1165 | dev | 407 | else if(0 == strcmp(argv[i], PARAM_CONFIG)) { |
1163 | dev | 408 | if(cfg->config_file[0] != '\0') |
1165 | dev | 409 | return print_cmd_error(argc, argv, "Config file name is already set", NULL); |
1140 | dev | 410 | |
411 | if(++i < argc) { |
||
1165 | dev | 412 | strncpy(cfg->config_file, argv[i], FILENAME_MAX); |
413 | if(cfg->config_file[FILENAME_MAX - 1] != '\0') |
||
1155 | dev | 414 | return print_cmd_error(argc, argv, |
415 | "Config file name is too long", NULL); |
||
1140 | dev | 416 | } |
417 | else { |
||
1165 | dev | 418 | return print_cmd_error(argc, argv, "Config file name expected", NULL); |
1140 | dev | 419 | } |
420 | } |
||
1165 | dev | 421 | else if(0 == strcmp(argv[i], PARAM_PID_FILE)) { |
422 | if(cfg->pid_file[0] != '\0') |
||
423 | return print_cmd_error(argc, argv, "PID file name is already set", NULL); |
||
424 | |||
425 | if(++i < argc) { |
||
426 | strncpy(cfg->pid_file, argv[i], FILENAME_MAX); |
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427 | if(cfg->pid_file[FILENAME_MAX - 1] != '\0') |
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428 | return print_cmd_error(argc, argv, |
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429 | "PID file name is too long", NULL); |
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430 | } |
||
431 | else { |
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432 | return print_cmd_error(argc, argv, "PID file name expected", NULL); |
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433 | } |
||
434 | } |
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435 | else if(0 == strcmp(argv[i], PARAM_VERSION)) { |
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1145 | dev | 436 | print_version(); |
437 | return RESULT_EXIT; |
||
438 | } |
||
439 | else if(0 == strcmp(argv[i], PARAM_HELP_1) || 0 == strcmp(argv[i], PARAM_HELP_2)) { |
||
440 | pring_usage(argc, argv); |
||
441 | return RESULT_EXIT; |
||
442 | } |
||
1140 | dev | 443 | else { |
1145 | dev | 444 | return print_cmd_error(argc, argv, "Unknown parameter", argv[i]); |
1140 | dev | 445 | } |
446 | } |
||
447 | |||
1145 | dev | 448 | return RESULT_OK; |
1140 | dev | 449 | } |
450 | |||
1164 | dev | 451 | static int validate_equal_sign(const char *config_name, const int count, const char *line, |
452 | uint name_len, char **subline) |
||
453 | { |
||
454 | const char *c; |
||
1140 | dev | 455 | |
1164 | dev | 456 | c = line + name_len - 1; |
457 | if('=' != c[0] && !isspace(c[0])) |
||
458 | return print_config_error(config_name, count, "Unknown config parameter", line); |
||
459 | while(c[0] != '\0' && isspace(c[0])) c++; |
||
460 | if('=' != c[0]) |
||
461 | return print_config_error(config_name, count, "Equal sign expected", NULL); |
||
462 | c++; |
||
463 | |||
464 | if(subline) *subline = (char *)c; |
||
465 | |||
466 | return RESULT_OK; |
||
467 | } |
||
468 | |||
469 | static int validate_eol(const char *config_name, const int count, const char *line) |
||
470 | { |
||
471 | while(line[0] != '\0' && isspace(line[0])) line++; |
||
472 | if('\0' != line[0] && '#' != line[0]) |
||
473 | return print_config_error(config_name, count, "End of line expected", NULL); |
||
474 | |||
475 | return RESULT_OK; |
||
476 | } |
||
477 | |||
1165 | dev | 478 | static int extract_string_value(const char *config_name, const int count, char **subline, int must_quot, |
479 | char *string, uint len) |
||
1164 | dev | 480 | { |
481 | uint cur_len; |
||
1165 | dev | 482 | int quot; |
1164 | dev | 483 | |
484 | while(*subline[0] != '\0' && isspace(*subline[0])) (*subline)++; |
||
1165 | dev | 485 | if('"' == *subline[0]) { |
486 | quot = 1; |
||
487 | (*subline)++; |
||
488 | } |
||
489 | else { |
||
490 | if(must_quot) { |
||
491 | return print_config_error(config_name, count, "Open quot expected", NULL); |
||
492 | } |
||
493 | else { |
||
494 | quot = 0; |
||
495 | /* skip spaces if not quoted */ |
||
496 | while(*subline[0] != '\0' && isspace(*subline[0])) (*subline)++; |
||
497 | } |
||
498 | } |
||
1164 | dev | 499 | |
500 | cur_len = 0; |
||
1165 | dev | 501 | while(*subline[0] != '\0') |
1164 | dev | 502 | { |
1165 | dev | 503 | if(cur_len >= len) return print_config_error(config_name, count, "Value too long", NULL); |
504 | if(quot && *subline[0] == '"') break; |
||
505 | if(!quot && isspace(*subline[0])) break; |
||
506 | |||
1164 | dev | 507 | string[0] = *subline[0]; |
508 | string++; |
||
509 | (*subline)++; |
||
510 | cur_len++; |
||
511 | } |
||
512 | |||
513 | string[0] = '\0'; |
||
1165 | dev | 514 | if(quot) { |
515 | if('"' != *subline[0]) |
||
516 | return print_config_error(config_name, count, "Close quot expected", NULL); |
||
517 | (*subline)++; |
||
518 | } |
||
1164 | dev | 519 | |
520 | return RESULT_OK; |
||
521 | } |
||
522 | |||
1163 | dev | 523 | static int parse_config_file(struct config *cfg, const char *config_name) |
1140 | dev | 524 | { |
525 | FILE *config_file; |
||
526 | char buf[MAX_CONFIG_LINE]; |
||
527 | char *line; |
||
528 | char *subline; |
||
529 | int count; |
||
1156 | dev | 530 | uint len; |
1163 | dev | 531 | long port; |
1164 | dev | 532 | int res; |
1140 | dev | 533 | |
1163 | dev | 534 | memset(cfg, 0, sizeof(struct config)); |
535 | |||
1140 | dev | 536 | config_file = fopen(config_name, "r"); |
1165 | dev | 537 | if(!config_file) |
538 | return print_error("Can not open config file", strerror(errno)); |
||
1140 | dev | 539 | |
540 | count = 0; |
||
541 | while(fgets(buf, sizeof(buf), config_file)) { |
||
542 | count++; |
||
543 | line = buf; |
||
544 | |||
545 | /* skip end spaces */ |
||
1156 | dev | 546 | len = strlen(line); |
1146 | dev | 547 | if(len == MAX_CONFIG_LINE-1) |
548 | return print_config_error(config_name, count, "Line is too long", NULL); |
||
1140 | dev | 549 | while(len && isspace(line[len-1])) --len; |
550 | if(!len) continue; |
||
551 | line[len] = '\0'; |
||
552 | |||
553 | /* skip begin spaces */ |
||
554 | while(line[0] != '\0' && isspace(line[0])) line++; |
||
555 | |||
556 | if('#' == line[0]) { /* skip comment lines */ |
||
557 | continue; |
||
558 | } |
||
1164 | dev | 559 | else if(strncmp(line, CONFIG_INTERFACE, min(sizeof(CONFIG_INTERFACE) - 1, len)) == 0) { |
560 | if((res = validate_equal_sign(config_name, count, line, |
||
561 | sizeof(CONFIG_INTERFACE), &subline)) != RESULT_OK) return res; |
||
562 | |||
563 | if(parse_interface(subline, &subline, &cfg->interface) != RESULT_OK) |
||
564 | return print_config_error(config_name, count, |
||
565 | "Cannot parse interface", NULL); |
||
566 | |||
567 | if((res = validate_eol(config_name, count, subline)) != RESULT_OK) return res; |
||
568 | } |
||
1140 | dev | 569 | else if(strncmp(line, CONFIG_PORT, min(sizeof(CONFIG_PORT) - 1, len)) == 0) { |
1164 | dev | 570 | if((res = validate_equal_sign(config_name, count, line, sizeof(CONFIG_PORT), |
571 | &subline)) != RESULT_OK) return res; |
||
572 | |||
1163 | dev | 573 | port = strtol(subline, &subline, 10); |
574 | if(port < PORT_MIN || port > PORT_MAX) |
||
1140 | dev | 575 | return print_config_error(config_name, count, |
576 | "Port number must be integer between 1 and 65535", NULL); |
||
1164 | dev | 577 | |
578 | if((res = validate_eol(config_name, count, subline)) != RESULT_OK) return res; |
||
1163 | dev | 579 | cfg->port = (ushort)port; |
1140 | dev | 580 | } |
581 | else if(strncmp(line, CONFIG_PASSWORD, min(sizeof(CONFIG_PASSWORD) - 1, len)) == 0) { |
||
1164 | dev | 582 | if((res = validate_equal_sign(config_name, count, line, |
583 | sizeof(CONFIG_PASSWORD), &subline)) != RESULT_OK) return res; |
||
1140 | dev | 584 | |
1165 | dev | 585 | if((res = extract_string_value(config_name, count, &subline, 1, |
1164 | dev | 586 | cfg->password, sizeof(cfg->password))) != RESULT_OK) return res; |
1140 | dev | 587 | |
1164 | dev | 588 | if((res = validate_eol(config_name, count, subline)) != RESULT_OK) return res; |
1140 | dev | 589 | } |
1165 | dev | 590 | else if(strncmp(line, CONFIG_PID_FILE, min(sizeof(CONFIG_PID_FILE) - 1, len)) == 0) { |
591 | if((res = validate_equal_sign(config_name, count, line, |
||
592 | sizeof(CONFIG_PID_FILE), &subline)) != RESULT_OK) return res; |
||
593 | |||
594 | if((res = extract_string_value(config_name, count, &subline, 0, |
||
595 | cfg->pid_file, sizeof(cfg->pid_file))) != RESULT_OK) return res; |
||
596 | |||
597 | if((res = validate_eol(config_name, count, subline)) != RESULT_OK) return res; |
||
598 | } |
||
1140 | dev | 599 | else { |
600 | return print_config_error(config_name, count, "Unknown config parameter", line); |
||
601 | } |
||
602 | } |
||
1164 | dev | 603 | if(ferror(config_file)) { |
1165 | dev | 604 | print_error("Config file reading failed", strerror(errno)); |
1164 | dev | 605 | } |
1140 | dev | 606 | |
1165 | dev | 607 | if(fclose(config_file) != 0) |
608 | return print_error("Can not close config file", strerror(errno)); |
||
1140 | dev | 609 | |
1145 | dev | 610 | return RESULT_OK; |
1140 | dev | 611 | } |
612 | |||
1156 | dev | 613 | static int get_revision(void) |
1145 | dev | 614 | { |
1156 | dev | 615 | int r; |
616 | const char *begin; |
||
1145 | dev | 617 | |
618 | begin = REVISION; |
||
619 | while(begin[0] != '\0' && begin[0] != ':') begin++; |
||
620 | if(begin[0] == '\0') return 0; |
||
621 | begin++; |
||
1156 | dev | 622 | r = (int)strtol(begin, (char**)NULL, 10); |
1145 | dev | 623 | |
624 | return r; |
||
625 | } |
||
626 | |||
1165 | dev | 627 | static int save_pid(const char *pid_file, const pid_t pid) |
628 | { |
||
629 | int fd; |
||
630 | FILE *file; |
||
631 | |||
632 | if(!pid_file || pid_file[0] == '\0') return RESULT_OK; |
||
633 | |||
634 | unlink(pid_file); |
||
635 | |||
636 | fd = open(pid_file, O_WRONLY | O_CREAT | O_EXCL, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH); |
||
637 | if(fd < 0) { |
||
638 | syslog(LOG_ERR, "Can open PID file %s for write: %s\n", pid_file, strerror(errno)); |
||
639 | return RESULT_ERROR; |
||
640 | } |
||
641 | |||
642 | file = fdopen(fd, "w"); |
||
643 | if(!file) { |
||
644 | syslog(LOG_ERR, "Can open PID file %s for write: %s\n", pid_file, strerror(errno)); |
||
645 | return RESULT_ERROR; |
||
646 | } |
||
647 | |||
648 | if(fprintf(file, "%d\n", pid) < 0) { |
||
649 | syslog(LOG_ERR, "Can write PID to file %s: %s\n", pid_file, strerror(errno)); |
||
650 | return RESULT_ERROR; |
||
651 | } |
||
652 | |||
653 | if(fclose(file) != 0) { |
||
654 | syslog(LOG_ERR, "Can not close PID file %s: %s\n", pid_file, strerror(errno)); |
||
655 | return RESULT_UNEXPECTED; |
||
656 | } |
||
657 | |||
658 | return RESULT_OK; |
||
659 | } |
||
660 | |||
1156 | dev | 661 | static int create_child(int soc) |
1143 | dev | 662 | { |
663 | pid_t child; |
||
664 | |||
665 | child = fork(); |
||
666 | if(child == -1) { |
||
667 | fprintf(stderr, "Cannot fork: %s\n", strerror(errno)); |
||
1145 | dev | 668 | return RESULT_UNEXPECTED; /* an unexpected error */ |
1143 | dev | 669 | } |
670 | else if(child > 0) { |
||
1156 | dev | 671 | if(close(soc) != 0) { |
1143 | dev | 672 | fprintf(stderr, "Cannot close socket: %s\n", strerror(errno)); |
1145 | dev | 673 | return RESULT_UNEXPECTED; /* an unexpected error */ |
1143 | dev | 674 | } |
1165 | dev | 675 | |
1145 | dev | 676 | return RESULT_EXIT; /* we are the parent */ |
1143 | dev | 677 | } |
678 | else { |
||
1145 | dev | 679 | return RESULT_OK; /* we are the child */ |
1143 | dev | 680 | } |
681 | } |
||
682 | |||
683 | static int close_descr(int d) |
||
684 | { |
||
685 | if(close(d) != 0) { |
||
686 | syslog(LOG_ERR, "Cannot close descriptor %d: %s\n", d, strerror(errno)); |
||
1145 | dev | 687 | return RESULT_UNEXPECTED; |
1143 | dev | 688 | } |
1145 | dev | 689 | return RESULT_OK; |
1143 | dev | 690 | } |
691 | |||
1165 | dev | 692 | static void reconfig_signal(void) |
693 | { |
||
694 | syslog(LOG_INFO, "reconfig"); |
||
695 | reconfig_needed = 1; |
||
696 | } |
||
697 | |||
698 | static void delete_pid_file(void) |
||
699 | { |
||
700 | if(global_cfg.pid_file && global_cfg.pid_file[0] != '\0') { |
||
701 | if(unlink(global_cfg.pid_file) != 0) { |
||
702 | syslog(LOG_ERR, "Cannot delete PID file %s: %s\n", |
||
703 | global_cfg.pid_file, strerror(errno)); |
||
704 | } |
||
705 | } |
||
706 | } |
||
707 | |||
708 | static void quit_signal(void) |
||
709 | { |
||
710 | delete_pid_file(); |
||
711 | syslog(LOG_WARNING, "quit"); |
||
712 | exit(0); |
||
713 | } |
||
714 | |||
715 | static void signal_handler(int sig) |
||
716 | { |
||
717 | int saved_errno = errno; |
||
718 | |||
719 | switch(sig) { |
||
720 | case SIGHUP: |
||
721 | reconfig_signal(); |
||
722 | break; |
||
723 | |||
724 | case SIGINT: |
||
725 | case SIGTERM: |
||
726 | case SIGQUIT: |
||
727 | quit_signal(); |
||
728 | break; |
||
729 | } |
||
730 | |||
731 | errno = saved_errno; |
||
732 | } |
||
733 | |||
734 | static int init_signal_handler(int sig) |
||
735 | { |
||
736 | struct sigaction sa; |
||
737 | |||
738 | sa.sa_flags = 0; |
||
739 | sa.sa_handler = signal_handler; |
||
740 | sigemptyset(&sa.sa_mask); |
||
741 | |||
742 | if(sigaction(sig, &sa, (struct sigaction *)NULL) != 0) { |
||
743 | syslog(LOG_ERR, "Cannot register handler for signal %d: %s\n", sig, strerror(errno)); |
||
744 | return RESULT_UNEXPECTED; |
||
745 | } |
||
746 | |||
747 | return RESULT_OK; |
||
748 | } |
||
749 | |||
750 | static int init_signals(void) |
||
751 | { |
||
752 | if(init_signal_handler(SIGHUP) != RESULT_OK) return RESULT_UNEXPECTED; |
||
753 | if(init_signal_handler(SIGINT) != RESULT_OK) return RESULT_UNEXPECTED; |
||
754 | if(init_signal_handler(SIGTERM) != RESULT_OK) return RESULT_UNEXPECTED; |
||
755 | if(init_signal_handler(SIGQUIT) != RESULT_OK) return RESULT_UNEXPECTED; |
||
756 | |||
757 | return RESULT_OK; |
||
758 | } |
||
759 | |||
760 | static void check_return(int res) |
||
761 | { |
||
762 | if(daemonized && res != RESULT_OK) { |
||
763 | delete_pid_file(); |
||
764 | syslog(LOG_WARNING, "quit"); |
||
765 | } |
||
766 | |||
767 | switch(res) { |
||
768 | case RESULT_EXIT: exit(EXIT_OK); return; /* no error but exit */ |
||
769 | case RESULT_ERROR: exit(EXIT_USER_ERROR); return; /* user error */ |
||
770 | case RESULT_UNEXPECTED: exit(EXIT_UNEXPECTED); return; /* unexpected error */ |
||
771 | } |
||
772 | } |
||
773 | |||
1156 | dev | 774 | int main(int argc, const char* argv[]) |
1140 | dev | 775 | { |
1165 | dev | 776 | int soc; |
777 | int reinit_needed; |
||
1140 | dev | 778 | |
1143 | dev | 779 | /* get config */ |
1165 | dev | 780 | check_return(read_config(&global_cfg, argc, argv)); |
1143 | dev | 781 | |
782 | /* try to listen the port */ |
||
1165 | dev | 783 | if((soc = establish(&global_cfg)) < 0) { |
784 | fprintf(stderr, "Cannot listen to port %i\n", global_cfg.port); |
||
1145 | dev | 785 | return EXIT_USER_ERROR; |
1140 | dev | 786 | } |
787 | |||
1143 | dev | 788 | /* fork and release the console */ |
1165 | dev | 789 | check_return(create_child(soc)); |
1140 | dev | 790 | |
1143 | dev | 791 | /* continue as first child */ |
792 | if(setsid() == -1) { |
||
793 | fprintf(stderr, "Cannot create session: %s\n", strerror(errno)); |
||
1145 | dev | 794 | return EXIT_UNEXPECTED; |
1143 | dev | 795 | } |
796 | |||
797 | /* fork the second time */ |
||
1165 | dev | 798 | check_return(create_child(soc)); |
799 | |||
800 | /* continue as final child */ |
||
801 | if(init_signals() != RESULT_OK) return EXIT_UNEXPECTED; |
||
802 | |||
803 | if(chdir("/") < 0) { |
||
804 | fprintf(stderr, "Cannot chdir to /: %s\n", strerror(errno)); |
||
805 | return EXIT_UNEXPECTED; |
||
1143 | dev | 806 | } |
1165 | dev | 807 | umask(0); |
808 | check_return(save_pid(global_cfg.pid_file, getpid())); |
||
809 | daemonized = 1; |
||
1143 | dev | 810 | |
1165 | dev | 811 | /* from now do not use console for error output */ |
1145 | dev | 812 | if(close_descr(0) != RESULT_OK) return EXIT_UNEXPECTED; |
813 | if(close_descr(1) != RESULT_OK) return EXIT_UNEXPECTED; |
||
814 | if(close_descr(2) != RESULT_OK) return EXIT_UNEXPECTED; |
||
1143 | dev | 815 | |
1165 | dev | 816 | for(;;) { |
817 | syslog(LOG_INFO, "listen on %d", global_cfg.port); |
||
818 | listen_socket(&global_cfg, soc); |
||
1143 | dev | 819 | |
1165 | dev | 820 | if(reconfig_needed) { |
821 | reconfig_needed = 0; |
||
822 | check_return(reread_config(&global_cfg, &reinit_needed)); |
||
823 | if(reinit_needed) { |
||
824 | close(soc); |
||
825 | |||
826 | if((soc = establish(&global_cfg)) < 0) { |
||
827 | syslog(LOG_ERR, "Cannot listen to port %i\n", global_cfg.port); |
||
828 | check_return(RESULT_ERROR); |
||
829 | } |
||
830 | } |
||
831 | } |
||
832 | } |
||
833 | |||
834 | return EXIT_OK; /* unreacheable */ |
||
1140 | dev | 835 | } |
836 |