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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: 1169 $" |
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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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1169 | dev | 76 | #define PARAM_DEBUG "--debug" |
1164 | dev | 77 | #define CONFIG_INTERFACE "interface" |
1145 | dev | 78 | #define CONFIG_PORT "port" |
79 | #define CONFIG_PASSWORD "password" |
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1165 | dev | 80 | #define CONFIG_PID_FILE "pid" |
1145 | dev | 81 | |
1165 | dev | 82 | /* priority of defferent sources of options */ |
83 | #define CFG_PRIO_CMD 1 |
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84 | #define CFG_PRIO_CONFIG 2 |
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85 | #define CFG_PRIO_DEFAULT 3 |
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86 | |||
1140 | dev | 87 | struct config { |
1164 | dev | 88 | char config_file[FILENAME_MAX]; |
1165 | dev | 89 | char config_file_prio; |
1164 | dev | 90 | struct in_addr interface; |
1165 | dev | 91 | char interface_prio; |
1164 | dev | 92 | ushort port; |
1165 | dev | 93 | char port_prio; |
1164 | dev | 94 | char password[MAX_CONFIG_LINE]; |
1165 | dev | 95 | char password_prio; |
96 | char pid_file[FILENAME_MAX]; |
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97 | char pid_file_prio; |
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1169 | dev | 98 | char debug_mode; |
1140 | dev | 99 | }; |
1165 | dev | 100 | |
101 | static struct config global_cfg; |
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1169 | dev | 102 | static int daemonized = 0; /* we are already a daemon */ |
103 | volatile static int reconfig_required = 0; /* we have to stop socket listening and reread config */ |
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104 | volatile static int quit_required = 0; /* we have to stop socket listening and exit */ |
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1140 | dev | 105 | |
1163 | dev | 106 | static int parse_cmd_line(struct config *cfg, int argc, const char* argv[]); |
107 | static int parse_config_file(struct config *cfg, const char *config_name); |
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1156 | dev | 108 | static int get_revision(void); |
1165 | dev | 109 | static void check_return(int res); |
1140 | dev | 110 | |
1156 | dev | 111 | static uint min(uint a, uint b) |
1140 | dev | 112 | { |
113 | return (a < b) ? a : b; |
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114 | } |
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115 | |||
1164 | dev | 116 | static int establish(const struct config *cfg) |
1140 | dev | 117 | { |
118 | int s; |
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119 | struct sockaddr_in sa; |
||
120 | |||
121 | memset(&sa, 0, sizeof(struct sockaddr_in)); |
||
122 | |||
123 | sa.sin_family = AF_INET; |
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1164 | dev | 124 | sa.sin_port = htons(cfg->port); |
125 | sa.sin_addr.s_addr = (cfg->interface.s_addr ? cfg->interface.s_addr : INADDR_ANY); |
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1140 | dev | 126 | |
1168 | dev | 127 | if((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) |
1140 | dev | 128 | return -1; |
129 | |||
130 | if(bind(s, (struct sockaddr *)&sa, sizeof(struct sockaddr_in)) < 0) { |
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131 | close(s); |
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132 | return -1; |
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133 | } |
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134 | |||
135 | return s; |
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136 | } |
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137 | |||
1156 | dev | 138 | static void listen_socket(const struct config *cfg, int soc) |
1142 | dev | 139 | { |
1168 | dev | 140 | char buf[BUFSIZE]; |
141 | int br; |
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142 | struct sockaddr_storage ss; |
||
143 | socklen_t ss_size; |
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1142 | dev | 144 | |
145 | for(;;) { |
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1168 | dev | 146 | ss_size = sizeof(ss); |
147 | br = recvfrom(soc, buf, sizeof(buf)-1, 0, (struct sockaddr *)&ss, &ss_size); |
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148 | |||
1169 | dev | 149 | if(br < 0) { |
150 | if(errno == EINTR) { |
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151 | if(reconfig_required || quit_required) break; |
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152 | } |
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153 | else { |
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154 | syslog(LOG_INFO, "cannot receive: %s", strerror(errno)); |
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155 | } |
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156 | |||
1142 | dev | 157 | continue; |
158 | } |
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159 | |||
1168 | dev | 160 | buf[br] = '\0'; |
1142 | dev | 161 | sleep(1); |
1147 | dev | 162 | syslog(LOG_INFO, "got command"); |
1142 | dev | 163 | |
1168 | dev | 164 | if(0 == strncmp(buf, cfg->password, sizeof(buf))) { |
1169 | dev | 165 | if(cfg->debug_mode) { |
166 | syslog(LOG_INFO, "REBOOT, debug mode"); |
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1142 | dev | 167 | } |
1169 | dev | 168 | else { |
169 | syslog(LOG_EMERG, "REBOOT"); |
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170 | sleep(5); |
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171 | if(reboot(RB_AUTOBOOT) < 0) { |
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172 | syslog(LOG_ERR, "cannot reboot, %s", strerror(errno)); |
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173 | } |
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174 | } |
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1142 | dev | 175 | } |
176 | } |
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177 | } |
||
178 | |||
1156 | dev | 179 | static void print_version(void) |
1140 | dev | 180 | { |
1145 | dev | 181 | printf("%s %s.%d\n", APP_NAME, VERSION, get_revision()); |
182 | } |
||
183 | |||
1156 | dev | 184 | static void pring_usage(int argc, const char* argv[]) |
1145 | dev | 185 | { |
186 | print_version(); |
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1168 | dev | 187 | printf("\nA daemon which waits on specified UDP port for special"); |
1159 | dev | 188 | printf(" string (password) and reboots the computer.\n\n"); |
1164 | dev | 189 | printf("Usage: %s [--interface IP] [--port PORT] [--config CONFIG_FILE]\n", argv[0]); |
1145 | dev | 190 | printf(" or: %s --version\n", argv[0]); |
191 | printf(" or: %s --help\n\n", argv[0]); |
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1159 | dev | 192 | printf("Defaults are port 19 and config /etc/rebootd.conf.\n\n"); |
1145 | dev | 193 | printf("Config file looks like:\n--------------------------\n"); |
1164 | dev | 194 | printf("interface=192.168.0.1\nport=19\npassword=\"some password\"\n--------------------------\n\n"); |
1168 | dev | 195 | printf("Then run from any other host:\necho -n \"some password\" | nc -uo host_to_rebot 19\n"); |
1145 | dev | 196 | } |
197 | |||
1165 | dev | 198 | static int print_error(const char *msg, const char *value) |
199 | { |
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200 | if(daemonized) { |
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201 | syslog(LOG_ERR, "%s", msg); |
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202 | if(value) syslog(LOG_ERR, " - %s\n", value); |
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203 | syslog(LOG_ERR, "\n"); |
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204 | } |
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205 | else { |
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206 | fprintf(stderr, "%s", msg); |
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207 | if(value) fprintf(stderr, " - %s\n", value); |
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208 | fprintf(stderr, "\n"); |
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209 | } |
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210 | |||
211 | return RESULT_ERROR; |
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212 | } |
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213 | |||
1156 | dev | 214 | static int print_cmd_error(int argc, const char* argv[], const char *msg, const char *value) |
1145 | dev | 215 | { |
1140 | dev | 216 | fprintf(stderr, "%s", msg); |
217 | if(value) fprintf(stderr, " - %s\n", value); |
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218 | fprintf(stderr, "\n"); |
||
219 | |||
1145 | dev | 220 | pring_usage(argc, argv); |
221 | |||
222 | return RESULT_ERROR; |
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1140 | dev | 223 | } |
224 | |||
1156 | dev | 225 | static int print_config_error(const char *config_name, int line, const char *msg, const char *value) |
1140 | dev | 226 | { |
1165 | dev | 227 | if(daemonized) { |
228 | syslog(LOG_ERR, "Error in %s, line %d: %s", config_name, line, msg); |
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229 | if(value) syslog(LOG_ERR, " - %s", value); |
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230 | syslog(LOG_ERR, "\n"); |
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231 | } |
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232 | else { |
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233 | fprintf(stderr, "Error in %s, line %d: %s", config_name, line, msg); |
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234 | if(value) fprintf(stderr, " - %s", value); |
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235 | fprintf(stderr, "\n"); |
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236 | } |
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1140 | dev | 237 | |
1145 | dev | 238 | return RESULT_ERROR; |
1140 | dev | 239 | } |
240 | |||
1165 | dev | 241 | static int check_abs_path(const char *file_name) |
242 | { |
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243 | if(file_name && file_name[0] != '\0' && file_name[0] != '/') { |
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244 | return print_error("File must have an absolute path", file_name); |
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245 | } |
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246 | |||
247 | return RESULT_OK; |
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248 | } |
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249 | |||
1156 | dev | 250 | static int read_config(struct config *cfg, int argc, const char* argv[]) |
1140 | dev | 251 | { |
1165 | dev | 252 | int res_cmd_line; |
253 | int res_config_file; |
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1163 | dev | 254 | struct config cmd_cfg; |
255 | struct config file_cfg; |
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1140 | dev | 256 | |
1164 | dev | 257 | memset(cfg, 0, sizeof(struct config)); |
1163 | dev | 258 | res_cmd_line = parse_cmd_line(&cmd_cfg, argc, argv); |
1145 | dev | 259 | if(res_cmd_line != RESULT_OK) return res_cmd_line; |
1165 | dev | 260 | if(check_abs_path(cmd_cfg.config_file) != RESULT_OK) return RESULT_ERROR; |
1140 | dev | 261 | |
1163 | dev | 262 | res_config_file = parse_config_file(&file_cfg, |
263 | cmd_cfg.config_file[0] != '\0' ? cmd_cfg.config_file : DEFAULT_CFG_FILE); |
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1145 | dev | 264 | if(res_config_file != RESULT_OK) return res_config_file; |
1140 | dev | 265 | |
1165 | dev | 266 | if(file_cfg.password[0] == '\0') |
267 | return print_error("Password is not set", NULL); |
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268 | |||
269 | /* save parsed values to general config */ |
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270 | if(cmd_cfg.config_file[0] != '\0') { |
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271 | strncpy(cfg->config_file, cmd_cfg.config_file, sizeof(cfg->config_file)); |
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272 | cfg->config_file_prio = CFG_PRIO_CMD; |
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1140 | dev | 273 | } |
1165 | dev | 274 | else { |
275 | strncpy(cfg->config_file, DEFAULT_CFG_FILE, sizeof(cfg->config_file)); |
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276 | cfg->config_file_prio = CFG_PRIO_DEFAULT; |
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277 | } |
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1140 | dev | 278 | |
1165 | dev | 279 | if(cmd_cfg.interface.s_addr) { |
280 | cfg->interface = cmd_cfg.interface; |
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281 | cfg->interface_prio = CFG_PRIO_CMD; |
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282 | } |
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283 | else if(file_cfg.interface.s_addr) { |
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284 | cfg->interface = file_cfg.interface; |
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285 | cfg->interface_prio = CFG_PRIO_CONFIG; |
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286 | } |
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287 | else { |
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288 | cfg->interface_prio = CFG_PRIO_DEFAULT; |
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289 | } |
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290 | |||
291 | if(cmd_cfg.port) { |
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292 | cfg->port = cmd_cfg.port; |
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293 | cfg->port_prio = CFG_PRIO_CMD; |
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294 | } |
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295 | else if(file_cfg.port) { |
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296 | cfg->port = file_cfg.port; |
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297 | cfg->port_prio = CFG_PRIO_CONFIG; |
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298 | } |
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299 | else { |
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300 | cfg->port = DEFAULT_PORT; |
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301 | cfg->port_prio = CFG_PRIO_DEFAULT; |
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302 | } |
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303 | |||
304 | if(cmd_cfg.pid_file[0] != '\0') { |
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305 | strncpy(cfg->pid_file, cmd_cfg.pid_file, sizeof(cfg->pid_file)); |
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306 | cfg->pid_file_prio = CFG_PRIO_CMD; |
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307 | } |
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308 | else if(file_cfg.pid_file[0] != '\0') { |
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309 | strncpy(cfg->pid_file, file_cfg.pid_file, sizeof(cfg->pid_file)); |
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310 | cfg->pid_file_prio = CFG_PRIO_CONFIG; |
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311 | } |
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312 | else { |
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313 | cfg->pid_file_prio = CFG_PRIO_DEFAULT; |
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314 | } |
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315 | if(check_abs_path(cfg->config_file) != RESULT_OK) return RESULT_ERROR; |
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316 | |||
317 | strncpy(cfg->password, file_cfg.password, sizeof(cfg->password)); |
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318 | cfg->password_prio = CFG_PRIO_CONFIG; |
||
319 | |||
1169 | dev | 320 | cfg->debug_mode = cmd_cfg.debug_mode; |
321 | |||
1165 | dev | 322 | return RESULT_OK; |
323 | } |
||
324 | |||
325 | static int reread_config(struct config *cfg, int *reinit_needed) |
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326 | { |
||
327 | int res_config_file; |
||
328 | struct config file_cfg; |
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329 | |||
330 | *reinit_needed = 0; |
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331 | |||
332 | res_config_file = parse_config_file(&file_cfg, cfg->config_file); |
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333 | if(res_config_file != RESULT_OK) return res_config_file; |
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334 | |||
335 | if(file_cfg.password[0] == '\0') |
||
336 | return print_error("Password is not set", NULL); |
||
337 | |||
1163 | dev | 338 | /* save parsed values to general config */ |
1165 | dev | 339 | if(cfg->interface_prio >= CFG_PRIO_CONFIG && cfg->interface.s_addr != file_cfg.interface.s_addr) |
340 | { |
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341 | *reinit_needed = 1; |
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342 | cfg->interface = file_cfg.interface; |
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343 | cfg->interface_prio = CFG_PRIO_CONFIG; |
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344 | } |
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1163 | dev | 345 | |
1165 | dev | 346 | if(cfg->port_prio >= CFG_PRIO_CONFIG && cfg->port != file_cfg.port && file_cfg.port) { |
347 | *reinit_needed = 1; |
||
348 | cfg->port = file_cfg.port; |
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349 | cfg->port_prio = CFG_PRIO_CONFIG; |
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350 | } |
||
1164 | dev | 351 | |
1165 | dev | 352 | if(check_abs_path(cfg->config_file) != RESULT_OK) return RESULT_ERROR; |
1140 | dev | 353 | |
1163 | dev | 354 | strncpy(cfg->password, file_cfg.password, sizeof(cfg->password)); |
1165 | dev | 355 | cfg->password_prio = CFG_PRIO_CONFIG; |
1163 | dev | 356 | |
1145 | dev | 357 | return RESULT_OK; |
1140 | dev | 358 | } |
359 | |||
1164 | dev | 360 | static int parse_interface(const char *s, char **end, struct in_addr *ip) |
361 | { |
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362 | char buf[MAX_CONFIG_LINE]; |
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363 | int count; |
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364 | const char *c; |
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365 | |||
366 | c = s; |
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367 | count = 0; |
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368 | while(c[0] != '\0' && !isspace(c[0])) c++, count++; |
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369 | if(count > MAX_CONFIG_LINE) return RESULT_ERROR; |
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370 | strncpy(buf, s, count); |
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371 | buf[count] = '\0'; |
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372 | c++; |
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373 | |||
374 | if(end) *end = (char *)c; |
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375 | |||
376 | if(inet_aton(buf, ip) == 1) |
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377 | return RESULT_OK; |
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378 | else |
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379 | return RESULT_ERROR; |
||
380 | } |
||
381 | |||
1163 | dev | 382 | static int parse_cmd_line(struct config *cfg, int argc, const char* argv[]) |
1140 | dev | 383 | { |
384 | char *end; |
||
385 | int i; |
||
1163 | dev | 386 | long port; |
1140 | dev | 387 | |
1163 | dev | 388 | memset(cfg, 0, sizeof(struct config)); |
1140 | dev | 389 | |
390 | for(i = 1; i < argc; i++) { |
||
1165 | dev | 391 | if(0 == strcmp(argv[i], PARAM_INTERFACE)) { |
1164 | dev | 392 | if(cfg->interface.s_addr) |
393 | return print_cmd_error(argc, argv, "Interface is already set", NULL); |
||
394 | |||
395 | if(++i < argc) { |
||
396 | if(parse_interface(argv[i], (char **)NULL, &cfg->interface) != RESULT_OK) |
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397 | return print_cmd_error(argc, argv, |
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398 | "Cannot parse interface", argv[i]); |
||
399 | } |
||
400 | else { |
||
401 | return print_cmd_error(argc, argv, "Interface expected", NULL); |
||
402 | } |
||
403 | } |
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1165 | dev | 404 | else if(0 == strcmp(argv[i], PARAM_PORT)) { |
1164 | dev | 405 | if(cfg->port) |
1145 | dev | 406 | return print_cmd_error(argc, argv, "Port is already set", NULL); |
1140 | dev | 407 | |
408 | if(++i < argc) { |
||
1163 | dev | 409 | port = strtol(argv[i], &end, 10); |
410 | if(*end != '\0' || port < PORT_MIN || port > PORT_MAX) |
||
1145 | dev | 411 | return print_cmd_error(argc, argv, |
412 | "Port number must be integer between 1 and 65535", NULL); |
||
1163 | dev | 413 | cfg->port = (ushort)port; |
1140 | dev | 414 | } |
415 | else { |
||
1145 | dev | 416 | return print_cmd_error(argc, argv, "Port number expected", NULL); |
1140 | dev | 417 | } |
418 | } |
||
1165 | dev | 419 | else if(0 == strcmp(argv[i], PARAM_CONFIG)) { |
1163 | dev | 420 | if(cfg->config_file[0] != '\0') |
1165 | dev | 421 | return print_cmd_error(argc, argv, "Config file name is already set", NULL); |
1140 | dev | 422 | |
423 | if(++i < argc) { |
||
1165 | dev | 424 | strncpy(cfg->config_file, argv[i], FILENAME_MAX); |
425 | if(cfg->config_file[FILENAME_MAX - 1] != '\0') |
||
1155 | dev | 426 | return print_cmd_error(argc, argv, |
427 | "Config file name is too long", NULL); |
||
1140 | dev | 428 | } |
429 | else { |
||
1165 | dev | 430 | return print_cmd_error(argc, argv, "Config file name expected", NULL); |
1140 | dev | 431 | } |
432 | } |
||
1165 | dev | 433 | else if(0 == strcmp(argv[i], PARAM_PID_FILE)) { |
434 | if(cfg->pid_file[0] != '\0') |
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435 | return print_cmd_error(argc, argv, "PID file name is already set", NULL); |
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436 | |||
437 | if(++i < argc) { |
||
438 | strncpy(cfg->pid_file, argv[i], FILENAME_MAX); |
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439 | if(cfg->pid_file[FILENAME_MAX - 1] != '\0') |
||
440 | return print_cmd_error(argc, argv, |
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441 | "PID file name is too long", NULL); |
||
442 | } |
||
443 | else { |
||
444 | return print_cmd_error(argc, argv, "PID file name expected", NULL); |
||
445 | } |
||
446 | } |
||
1169 | dev | 447 | else if(0 == strcmp(argv[i], PARAM_DEBUG)) { |
448 | cfg->debug_mode = 1; |
||
449 | } |
||
1165 | dev | 450 | else if(0 == strcmp(argv[i], PARAM_VERSION)) { |
1145 | dev | 451 | print_version(); |
452 | return RESULT_EXIT; |
||
453 | } |
||
454 | else if(0 == strcmp(argv[i], PARAM_HELP_1) || 0 == strcmp(argv[i], PARAM_HELP_2)) { |
||
455 | pring_usage(argc, argv); |
||
456 | return RESULT_EXIT; |
||
457 | } |
||
1140 | dev | 458 | else { |
1145 | dev | 459 | return print_cmd_error(argc, argv, "Unknown parameter", argv[i]); |
1140 | dev | 460 | } |
461 | } |
||
462 | |||
1145 | dev | 463 | return RESULT_OK; |
1140 | dev | 464 | } |
465 | |||
1164 | dev | 466 | static int validate_equal_sign(const char *config_name, const int count, const char *line, |
467 | uint name_len, char **subline) |
||
468 | { |
||
469 | const char *c; |
||
1140 | dev | 470 | |
1164 | dev | 471 | c = line + name_len - 1; |
472 | if('=' != c[0] && !isspace(c[0])) |
||
473 | return print_config_error(config_name, count, "Unknown config parameter", line); |
||
474 | while(c[0] != '\0' && isspace(c[0])) c++; |
||
475 | if('=' != c[0]) |
||
476 | return print_config_error(config_name, count, "Equal sign expected", NULL); |
||
477 | c++; |
||
478 | |||
479 | if(subline) *subline = (char *)c; |
||
480 | |||
481 | return RESULT_OK; |
||
482 | } |
||
483 | |||
484 | static int validate_eol(const char *config_name, const int count, const char *line) |
||
485 | { |
||
486 | while(line[0] != '\0' && isspace(line[0])) line++; |
||
487 | if('\0' != line[0] && '#' != line[0]) |
||
488 | return print_config_error(config_name, count, "End of line expected", NULL); |
||
489 | |||
490 | return RESULT_OK; |
||
491 | } |
||
492 | |||
1165 | dev | 493 | static int extract_string_value(const char *config_name, const int count, char **subline, int must_quot, |
494 | char *string, uint len) |
||
1164 | dev | 495 | { |
496 | uint cur_len; |
||
1165 | dev | 497 | int quot; |
1164 | dev | 498 | |
499 | while(*subline[0] != '\0' && isspace(*subline[0])) (*subline)++; |
||
1165 | dev | 500 | if('"' == *subline[0]) { |
501 | quot = 1; |
||
502 | (*subline)++; |
||
503 | } |
||
504 | else { |
||
505 | if(must_quot) { |
||
506 | return print_config_error(config_name, count, "Open quot expected", NULL); |
||
507 | } |
||
508 | else { |
||
509 | quot = 0; |
||
510 | /* skip spaces if not quoted */ |
||
511 | while(*subline[0] != '\0' && isspace(*subline[0])) (*subline)++; |
||
512 | } |
||
513 | } |
||
1164 | dev | 514 | |
515 | cur_len = 0; |
||
1165 | dev | 516 | while(*subline[0] != '\0') |
1164 | dev | 517 | { |
1165 | dev | 518 | if(cur_len >= len) return print_config_error(config_name, count, "Value too long", NULL); |
519 | if(quot && *subline[0] == '"') break; |
||
520 | if(!quot && isspace(*subline[0])) break; |
||
521 | |||
1164 | dev | 522 | string[0] = *subline[0]; |
523 | string++; |
||
524 | (*subline)++; |
||
525 | cur_len++; |
||
526 | } |
||
527 | |||
528 | string[0] = '\0'; |
||
1165 | dev | 529 | if(quot) { |
530 | if('"' != *subline[0]) |
||
531 | return print_config_error(config_name, count, "Close quot expected", NULL); |
||
532 | (*subline)++; |
||
533 | } |
||
1164 | dev | 534 | |
535 | return RESULT_OK; |
||
536 | } |
||
537 | |||
1163 | dev | 538 | static int parse_config_file(struct config *cfg, const char *config_name) |
1140 | dev | 539 | { |
540 | FILE *config_file; |
||
541 | char buf[MAX_CONFIG_LINE]; |
||
542 | char *line; |
||
543 | char *subline; |
||
544 | int count; |
||
1156 | dev | 545 | uint len; |
1163 | dev | 546 | long port; |
1164 | dev | 547 | int res; |
1140 | dev | 548 | |
1163 | dev | 549 | memset(cfg, 0, sizeof(struct config)); |
550 | |||
1140 | dev | 551 | config_file = fopen(config_name, "r"); |
1165 | dev | 552 | if(!config_file) |
553 | return print_error("Can not open config file", strerror(errno)); |
||
1140 | dev | 554 | |
555 | count = 0; |
||
556 | while(fgets(buf, sizeof(buf), config_file)) { |
||
557 | count++; |
||
558 | line = buf; |
||
559 | |||
560 | /* skip end spaces */ |
||
1156 | dev | 561 | len = strlen(line); |
1146 | dev | 562 | if(len == MAX_CONFIG_LINE-1) |
563 | return print_config_error(config_name, count, "Line is too long", NULL); |
||
1140 | dev | 564 | while(len && isspace(line[len-1])) --len; |
565 | if(!len) continue; |
||
566 | line[len] = '\0'; |
||
567 | |||
568 | /* skip begin spaces */ |
||
569 | while(line[0] != '\0' && isspace(line[0])) line++; |
||
570 | |||
571 | if('#' == line[0]) { /* skip comment lines */ |
||
572 | continue; |
||
573 | } |
||
1164 | dev | 574 | else if(strncmp(line, CONFIG_INTERFACE, min(sizeof(CONFIG_INTERFACE) - 1, len)) == 0) { |
575 | if((res = validate_equal_sign(config_name, count, line, |
||
576 | sizeof(CONFIG_INTERFACE), &subline)) != RESULT_OK) return res; |
||
577 | |||
578 | if(parse_interface(subline, &subline, &cfg->interface) != RESULT_OK) |
||
579 | return print_config_error(config_name, count, |
||
580 | "Cannot parse interface", NULL); |
||
581 | |||
582 | if((res = validate_eol(config_name, count, subline)) != RESULT_OK) return res; |
||
583 | } |
||
1140 | dev | 584 | else if(strncmp(line, CONFIG_PORT, min(sizeof(CONFIG_PORT) - 1, len)) == 0) { |
1164 | dev | 585 | if((res = validate_equal_sign(config_name, count, line, sizeof(CONFIG_PORT), |
586 | &subline)) != RESULT_OK) return res; |
||
587 | |||
1163 | dev | 588 | port = strtol(subline, &subline, 10); |
589 | if(port < PORT_MIN || port > PORT_MAX) |
||
1140 | dev | 590 | return print_config_error(config_name, count, |
591 | "Port number must be integer between 1 and 65535", NULL); |
||
1164 | dev | 592 | |
593 | if((res = validate_eol(config_name, count, subline)) != RESULT_OK) return res; |
||
1163 | dev | 594 | cfg->port = (ushort)port; |
1140 | dev | 595 | } |
596 | else if(strncmp(line, CONFIG_PASSWORD, min(sizeof(CONFIG_PASSWORD) - 1, len)) == 0) { |
||
1164 | dev | 597 | if((res = validate_equal_sign(config_name, count, line, |
598 | sizeof(CONFIG_PASSWORD), &subline)) != RESULT_OK) return res; |
||
1140 | dev | 599 | |
1165 | dev | 600 | if((res = extract_string_value(config_name, count, &subline, 1, |
1164 | dev | 601 | cfg->password, sizeof(cfg->password))) != RESULT_OK) return res; |
1140 | dev | 602 | |
1164 | dev | 603 | if((res = validate_eol(config_name, count, subline)) != RESULT_OK) return res; |
1140 | dev | 604 | } |
1165 | dev | 605 | else if(strncmp(line, CONFIG_PID_FILE, min(sizeof(CONFIG_PID_FILE) - 1, len)) == 0) { |
606 | if((res = validate_equal_sign(config_name, count, line, |
||
607 | sizeof(CONFIG_PID_FILE), &subline)) != RESULT_OK) return res; |
||
608 | |||
609 | if((res = extract_string_value(config_name, count, &subline, 0, |
||
610 | cfg->pid_file, sizeof(cfg->pid_file))) != RESULT_OK) return res; |
||
611 | |||
612 | if((res = validate_eol(config_name, count, subline)) != RESULT_OK) return res; |
||
613 | } |
||
1140 | dev | 614 | else { |
615 | return print_config_error(config_name, count, "Unknown config parameter", line); |
||
616 | } |
||
617 | } |
||
1164 | dev | 618 | if(ferror(config_file)) { |
1165 | dev | 619 | print_error("Config file reading failed", strerror(errno)); |
1164 | dev | 620 | } |
1140 | dev | 621 | |
1165 | dev | 622 | if(fclose(config_file) != 0) |
623 | return print_error("Can not close config file", strerror(errno)); |
||
1140 | dev | 624 | |
1145 | dev | 625 | return RESULT_OK; |
1140 | dev | 626 | } |
627 | |||
1156 | dev | 628 | static int get_revision(void) |
1145 | dev | 629 | { |
1156 | dev | 630 | int r; |
631 | const char *begin; |
||
1145 | dev | 632 | |
633 | begin = REVISION; |
||
634 | while(begin[0] != '\0' && begin[0] != ':') begin++; |
||
635 | if(begin[0] == '\0') return 0; |
||
636 | begin++; |
||
1156 | dev | 637 | r = (int)strtol(begin, (char**)NULL, 10); |
1145 | dev | 638 | |
639 | return r; |
||
640 | } |
||
641 | |||
1165 | dev | 642 | static int save_pid(const char *pid_file, const pid_t pid) |
643 | { |
||
644 | int fd; |
||
645 | FILE *file; |
||
646 | |||
647 | if(!pid_file || pid_file[0] == '\0') return RESULT_OK; |
||
648 | |||
649 | unlink(pid_file); |
||
650 | |||
651 | fd = open(pid_file, O_WRONLY | O_CREAT | O_EXCL, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH); |
||
652 | if(fd < 0) { |
||
653 | syslog(LOG_ERR, "Can open PID file %s for write: %s\n", pid_file, strerror(errno)); |
||
654 | return RESULT_ERROR; |
||
655 | } |
||
656 | |||
657 | file = fdopen(fd, "w"); |
||
658 | if(!file) { |
||
659 | syslog(LOG_ERR, "Can open PID file %s for write: %s\n", pid_file, strerror(errno)); |
||
660 | return RESULT_ERROR; |
||
661 | } |
||
662 | |||
663 | if(fprintf(file, "%d\n", pid) < 0) { |
||
664 | syslog(LOG_ERR, "Can write PID to file %s: %s\n", pid_file, strerror(errno)); |
||
665 | return RESULT_ERROR; |
||
666 | } |
||
667 | |||
668 | if(fclose(file) != 0) { |
||
669 | syslog(LOG_ERR, "Can not close PID file %s: %s\n", pid_file, strerror(errno)); |
||
670 | return RESULT_UNEXPECTED; |
||
671 | } |
||
672 | |||
673 | return RESULT_OK; |
||
674 | } |
||
675 | |||
1156 | dev | 676 | static int create_child(int soc) |
1143 | dev | 677 | { |
678 | pid_t child; |
||
679 | |||
680 | child = fork(); |
||
681 | if(child == -1) { |
||
682 | fprintf(stderr, "Cannot fork: %s\n", strerror(errno)); |
||
1145 | dev | 683 | return RESULT_UNEXPECTED; /* an unexpected error */ |
1143 | dev | 684 | } |
685 | else if(child > 0) { |
||
1156 | dev | 686 | if(close(soc) != 0) { |
1143 | dev | 687 | fprintf(stderr, "Cannot close socket: %s\n", strerror(errno)); |
1145 | dev | 688 | return RESULT_UNEXPECTED; /* an unexpected error */ |
1143 | dev | 689 | } |
1165 | dev | 690 | |
1145 | dev | 691 | return RESULT_EXIT; /* we are the parent */ |
1143 | dev | 692 | } |
693 | else { |
||
1145 | dev | 694 | return RESULT_OK; /* we are the child */ |
1143 | dev | 695 | } |
696 | } |
||
697 | |||
698 | static int close_descr(int d) |
||
699 | { |
||
700 | if(close(d) != 0) { |
||
701 | syslog(LOG_ERR, "Cannot close descriptor %d: %s\n", d, strerror(errno)); |
||
1145 | dev | 702 | return RESULT_UNEXPECTED; |
1143 | dev | 703 | } |
1145 | dev | 704 | return RESULT_OK; |
1143 | dev | 705 | } |
706 | |||
1165 | dev | 707 | static void delete_pid_file(void) |
708 | { |
||
709 | if(global_cfg.pid_file && global_cfg.pid_file[0] != '\0') { |
||
710 | if(unlink(global_cfg.pid_file) != 0) { |
||
711 | syslog(LOG_ERR, "Cannot delete PID file %s: %s\n", |
||
712 | global_cfg.pid_file, strerror(errno)); |
||
713 | } |
||
714 | } |
||
715 | } |
||
716 | |||
1169 | dev | 717 | static void reconfig_signal(void) |
718 | { |
||
719 | syslog(LOG_INFO, "reconfig"); |
||
720 | reconfig_required = 1; |
||
721 | } |
||
722 | |||
1165 | dev | 723 | static void quit_signal(void) |
724 | { |
||
725 | syslog(LOG_WARNING, "quit"); |
||
1169 | dev | 726 | quit_required = 1; |
1165 | dev | 727 | } |
728 | |||
729 | static void signal_handler(int sig) |
||
730 | { |
||
731 | int saved_errno = errno; |
||
732 | |||
733 | switch(sig) { |
||
734 | case SIGHUP: |
||
735 | reconfig_signal(); |
||
736 | break; |
||
737 | |||
738 | case SIGINT: |
||
739 | case SIGTERM: |
||
740 | case SIGQUIT: |
||
741 | quit_signal(); |
||
742 | break; |
||
743 | } |
||
744 | |||
745 | errno = saved_errno; |
||
746 | } |
||
747 | |||
748 | static int init_signal_handler(int sig) |
||
749 | { |
||
750 | struct sigaction sa; |
||
751 | |||
752 | sa.sa_flags = 0; |
||
753 | sa.sa_handler = signal_handler; |
||
754 | sigemptyset(&sa.sa_mask); |
||
755 | |||
756 | if(sigaction(sig, &sa, (struct sigaction *)NULL) != 0) { |
||
757 | syslog(LOG_ERR, "Cannot register handler for signal %d: %s\n", sig, strerror(errno)); |
||
758 | return RESULT_UNEXPECTED; |
||
759 | } |
||
760 | |||
761 | return RESULT_OK; |
||
762 | } |
||
763 | |||
764 | static int init_signals(void) |
||
765 | { |
||
766 | if(init_signal_handler(SIGHUP) != RESULT_OK) return RESULT_UNEXPECTED; |
||
767 | if(init_signal_handler(SIGINT) != RESULT_OK) return RESULT_UNEXPECTED; |
||
768 | if(init_signal_handler(SIGTERM) != RESULT_OK) return RESULT_UNEXPECTED; |
||
769 | if(init_signal_handler(SIGQUIT) != RESULT_OK) return RESULT_UNEXPECTED; |
||
770 | |||
771 | return RESULT_OK; |
||
772 | } |
||
773 | |||
774 | static void check_return(int res) |
||
775 | { |
||
776 | if(daemonized && res != RESULT_OK) { |
||
777 | delete_pid_file(); |
||
778 | syslog(LOG_WARNING, "quit"); |
||
779 | } |
||
780 | |||
781 | switch(res) { |
||
782 | case RESULT_EXIT: exit(EXIT_OK); return; /* no error but exit */ |
||
783 | case RESULT_ERROR: exit(EXIT_USER_ERROR); return; /* user error */ |
||
784 | case RESULT_UNEXPECTED: exit(EXIT_UNEXPECTED); return; /* unexpected error */ |
||
785 | } |
||
786 | } |
||
787 | |||
1156 | dev | 788 | int main(int argc, const char* argv[]) |
1140 | dev | 789 | { |
1165 | dev | 790 | int soc; |
791 | int reinit_needed; |
||
1140 | dev | 792 | |
1143 | dev | 793 | /* get config */ |
1165 | dev | 794 | check_return(read_config(&global_cfg, argc, argv)); |
1143 | dev | 795 | |
796 | /* try to listen the port */ |
||
1165 | dev | 797 | if((soc = establish(&global_cfg)) < 0) { |
798 | fprintf(stderr, "Cannot listen to port %i\n", global_cfg.port); |
||
1145 | dev | 799 | return EXIT_USER_ERROR; |
1140 | dev | 800 | } |
801 | |||
1143 | dev | 802 | /* fork and release the console */ |
1165 | dev | 803 | check_return(create_child(soc)); |
1140 | dev | 804 | |
1143 | dev | 805 | /* continue as first child */ |
806 | if(setsid() == -1) { |
||
807 | fprintf(stderr, "Cannot create session: %s\n", strerror(errno)); |
||
1145 | dev | 808 | return EXIT_UNEXPECTED; |
1143 | dev | 809 | } |
810 | |||
811 | /* fork the second time */ |
||
1165 | dev | 812 | check_return(create_child(soc)); |
813 | |||
814 | /* continue as final child */ |
||
815 | if(init_signals() != RESULT_OK) return EXIT_UNEXPECTED; |
||
816 | |||
817 | if(chdir("/") < 0) { |
||
818 | fprintf(stderr, "Cannot chdir to /: %s\n", strerror(errno)); |
||
819 | return EXIT_UNEXPECTED; |
||
1143 | dev | 820 | } |
1165 | dev | 821 | umask(0); |
822 | check_return(save_pid(global_cfg.pid_file, getpid())); |
||
823 | daemonized = 1; |
||
1143 | dev | 824 | |
1165 | dev | 825 | /* from now do not use console for error output */ |
1145 | dev | 826 | if(close_descr(0) != RESULT_OK) return EXIT_UNEXPECTED; |
827 | if(close_descr(1) != RESULT_OK) return EXIT_UNEXPECTED; |
||
828 | if(close_descr(2) != RESULT_OK) return EXIT_UNEXPECTED; |
||
1143 | dev | 829 | |
1165 | dev | 830 | for(;;) { |
831 | syslog(LOG_INFO, "listen on %d", global_cfg.port); |
||
832 | listen_socket(&global_cfg, soc); |
||
1143 | dev | 833 | |
1169 | dev | 834 | if(quit_required) { |
835 | break; |
||
836 | } |
||
837 | else if(reconfig_required) { |
||
838 | reconfig_required = 0; |
||
1165 | dev | 839 | check_return(reread_config(&global_cfg, &reinit_needed)); |
840 | if(reinit_needed) { |
||
841 | close(soc); |
||
842 | |||
843 | if((soc = establish(&global_cfg)) < 0) { |
||
844 | syslog(LOG_ERR, "Cannot listen to port %i\n", global_cfg.port); |
||
845 | check_return(RESULT_ERROR); |
||
846 | } |
||
847 | } |
||
848 | } |
||
849 | } |
||
850 | |||
1169 | dev | 851 | delete_pid_file(); |
852 | return EXIT_OK; |
||
1140 | dev | 853 | } |
854 |