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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 | * |
1171 | dev | 7 | * Run "./rebootd --help" to see options and parameters. |
1140 | dev | 8 | * |
9 | * Copyleft 2005 Anatoli Klassen |
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10 | * |
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11 | ******************************************************************/ |
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12 | |||
13 | #include <stdlib.h> |
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14 | #include <stdio.h> |
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15 | #include <string.h> |
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16 | #include <stdarg.h> |
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1144 | dev | 17 | #include <ctype.h> |
1140 | dev | 18 | #include <errno.h> |
19 | #include <signal.h> |
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20 | #include <unistd.h> |
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21 | #include <netdb.h> |
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22 | #include <syslog.h> |
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1165 | dev | 23 | #include <signal.h> |
24 | #include <fcntl.h> |
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1140 | dev | 25 | #include <sys/types.h> |
1144 | dev | 26 | #include <sys/stat.h> |
1140 | dev | 27 | #include <sys/socket.h> |
28 | #include <sys/wait.h> |
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29 | #include <sys/reboot.h> |
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30 | #include <netinet/in.h> |
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31 | #include <arpa/inet.h> |
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32 | |||
1145 | dev | 33 | /* name version number */ |
1159 | dev | 34 | #define APP_NAME "rebootd" |
1145 | dev | 35 | #define VERSION "1.0" |
36 | #define REVISION "$Rev: 1171 $" |
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1144 | dev | 37 | |
1145 | dev | 38 | #define DEFAULT_PORT 19 |
1159 | dev | 39 | #define DEFAULT_CFG_FILE "/etc/rebootd.conf" |
1145 | dev | 40 | #define CMDSIZE 4096 |
41 | #define BUFSIZE 4096 |
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42 | #define MAX_CONFIG_LINE 4096 |
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43 | #define PORT_MIN 1 |
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44 | #define PORT_MAX 65535 |
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1140 | dev | 45 | |
1145 | dev | 46 | /* return values of functions */ |
47 | #define RESULT_OK 0 |
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48 | #define RESULT_EXIT 1 |
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49 | #define RESULT_ERROR 2 |
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50 | #define RESULT_UNEXPECTED 3 |
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1140 | dev | 51 | |
1145 | dev | 52 | /* return values for the whole program */ |
53 | #define EXIT_OK 0 |
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54 | #define EXIT_USER_ERROR 1 |
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55 | #define EXIT_UNEXPECTED 2 |
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56 | |||
57 | /* command line and config file parameters */ |
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58 | #define PARAM_HELP_1 "-h" |
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59 | #define PARAM_HELP_2 "--help" |
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1165 | dev | 60 | #define PARAM_VERSION "--version" |
61 | #define PARAM_INTERFACE "--interface" |
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62 | #define PARAM_PORT "--port" |
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63 | #define PARAM_CONFIG "--config" |
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64 | #define PARAM_PID_FILE "--pid" |
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1169 | dev | 65 | #define PARAM_DEBUG "--debug" |
1164 | dev | 66 | #define CONFIG_INTERFACE "interface" |
1145 | dev | 67 | #define CONFIG_PORT "port" |
68 | #define CONFIG_PASSWORD "password" |
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1165 | dev | 69 | #define CONFIG_PID_FILE "pid" |
1145 | dev | 70 | |
1165 | dev | 71 | /* priority of defferent sources of options */ |
72 | #define CFG_PRIO_CMD 1 |
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73 | #define CFG_PRIO_CONFIG 2 |
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74 | #define CFG_PRIO_DEFAULT 3 |
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75 | |||
1140 | dev | 76 | struct config { |
1164 | dev | 77 | char config_file[FILENAME_MAX]; |
1165 | dev | 78 | char config_file_prio; |
1164 | dev | 79 | struct in_addr interface; |
1165 | dev | 80 | char interface_prio; |
1164 | dev | 81 | ushort port; |
1165 | dev | 82 | char port_prio; |
1164 | dev | 83 | char password[MAX_CONFIG_LINE]; |
1165 | dev | 84 | char password_prio; |
85 | char pid_file[FILENAME_MAX]; |
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86 | char pid_file_prio; |
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1169 | dev | 87 | char debug_mode; |
1140 | dev | 88 | }; |
1165 | dev | 89 | |
90 | static struct config global_cfg; |
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1169 | dev | 91 | static int daemonized = 0; /* we are already a daemon */ |
92 | volatile static int reconfig_required = 0; /* we have to stop socket listening and reread config */ |
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93 | volatile static int quit_required = 0; /* we have to stop socket listening and exit */ |
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1140 | dev | 94 | |
1163 | dev | 95 | static int parse_cmd_line(struct config *cfg, int argc, const char* argv[]); |
96 | static int parse_config_file(struct config *cfg, const char *config_name); |
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1156 | dev | 97 | static int get_revision(void); |
1165 | dev | 98 | static void check_return(int res); |
1140 | dev | 99 | |
1156 | dev | 100 | static uint min(uint a, uint b) |
1140 | dev | 101 | { |
102 | return (a < b) ? a : b; |
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103 | } |
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104 | |||
1164 | dev | 105 | static int establish(const struct config *cfg) |
1140 | dev | 106 | { |
107 | int s; |
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108 | struct sockaddr_in sa; |
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109 | |||
110 | memset(&sa, 0, sizeof(struct sockaddr_in)); |
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111 | |||
112 | sa.sin_family = AF_INET; |
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1164 | dev | 113 | sa.sin_port = htons(cfg->port); |
114 | sa.sin_addr.s_addr = (cfg->interface.s_addr ? cfg->interface.s_addr : INADDR_ANY); |
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1140 | dev | 115 | |
1168 | dev | 116 | if((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) |
1140 | dev | 117 | return -1; |
118 | |||
119 | if(bind(s, (struct sockaddr *)&sa, sizeof(struct sockaddr_in)) < 0) { |
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120 | close(s); |
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121 | return -1; |
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122 | } |
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123 | |||
124 | return s; |
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125 | } |
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126 | |||
1156 | dev | 127 | static void listen_socket(const struct config *cfg, int soc) |
1142 | dev | 128 | { |
1168 | dev | 129 | char buf[BUFSIZE]; |
130 | int br; |
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131 | struct sockaddr_storage ss; |
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132 | socklen_t ss_size; |
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1142 | dev | 133 | |
134 | for(;;) { |
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1168 | dev | 135 | ss_size = sizeof(ss); |
136 | br = recvfrom(soc, buf, sizeof(buf)-1, 0, (struct sockaddr *)&ss, &ss_size); |
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137 | |||
1169 | dev | 138 | if(br < 0) { |
139 | if(errno == EINTR) { |
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140 | if(reconfig_required || quit_required) break; |
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141 | } |
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142 | else { |
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143 | syslog(LOG_INFO, "cannot receive: %s", strerror(errno)); |
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144 | } |
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145 | |||
1142 | dev | 146 | continue; |
147 | } |
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148 | |||
1168 | dev | 149 | buf[br] = '\0'; |
1142 | dev | 150 | sleep(1); |
1147 | dev | 151 | syslog(LOG_INFO, "got command"); |
1142 | dev | 152 | |
1168 | dev | 153 | if(0 == strncmp(buf, cfg->password, sizeof(buf))) { |
1169 | dev | 154 | if(cfg->debug_mode) { |
155 | syslog(LOG_INFO, "REBOOT, debug mode"); |
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1142 | dev | 156 | } |
1169 | dev | 157 | else { |
158 | syslog(LOG_EMERG, "REBOOT"); |
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159 | sleep(5); |
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160 | if(reboot(RB_AUTOBOOT) < 0) { |
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161 | syslog(LOG_ERR, "cannot reboot, %s", strerror(errno)); |
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162 | } |
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163 | } |
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1142 | dev | 164 | } |
165 | } |
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166 | } |
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167 | |||
1156 | dev | 168 | static void print_version(void) |
1140 | dev | 169 | { |
1145 | dev | 170 | printf("%s %s.%d\n", APP_NAME, VERSION, get_revision()); |
171 | } |
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172 | |||
1156 | dev | 173 | static void pring_usage(int argc, const char* argv[]) |
1145 | dev | 174 | { |
175 | print_version(); |
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1168 | dev | 176 | printf("\nA daemon which waits on specified UDP port for special"); |
1159 | dev | 177 | printf(" string (password) and reboots the computer.\n\n"); |
1171 | dev | 178 | printf("Usage: %s [--debug] [--interface IP] [--port PORT]\n", argv[0]); |
179 | printf(" [--config CONFIG_FILE] [--pid FILE]\n"); |
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1145 | dev | 180 | printf(" or: %s --version\n", argv[0]); |
181 | printf(" or: %s --help\n\n", argv[0]); |
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1171 | dev | 182 | printf("Defaults are port 19, all interfaces, config /etc/rebootd.conf and no PID file.\n"); |
183 | printf("In debug mode do not reboot, just write to log.\n\n"); |
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1145 | dev | 184 | printf("Config file looks like:\n--------------------------\n"); |
1171 | dev | 185 | printf("interface=192.168.0.1\nport=19\npassword=\"some password\"\n"); |
186 | printf("pid=/var/run/rebootd.pid\n--------------------------\n\n"); |
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1168 | dev | 187 | printf("Then run from any other host:\necho -n \"some password\" | nc -uo host_to_rebot 19\n"); |
1145 | dev | 188 | } |
189 | |||
1165 | dev | 190 | static int print_error(const char *msg, const char *value) |
191 | { |
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192 | if(daemonized) { |
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193 | syslog(LOG_ERR, "%s", msg); |
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194 | if(value) syslog(LOG_ERR, " - %s\n", value); |
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195 | syslog(LOG_ERR, "\n"); |
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196 | } |
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197 | else { |
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198 | fprintf(stderr, "%s", msg); |
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199 | if(value) fprintf(stderr, " - %s\n", value); |
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200 | fprintf(stderr, "\n"); |
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201 | } |
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202 | |||
203 | return RESULT_ERROR; |
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204 | } |
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205 | |||
1156 | dev | 206 | static int print_cmd_error(int argc, const char* argv[], const char *msg, const char *value) |
1145 | dev | 207 | { |
1140 | dev | 208 | fprintf(stderr, "%s", msg); |
209 | if(value) fprintf(stderr, " - %s\n", value); |
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210 | fprintf(stderr, "\n"); |
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211 | |||
1145 | dev | 212 | pring_usage(argc, argv); |
213 | |||
214 | return RESULT_ERROR; |
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1140 | dev | 215 | } |
216 | |||
1156 | dev | 217 | static int print_config_error(const char *config_name, int line, const char *msg, const char *value) |
1140 | dev | 218 | { |
1165 | dev | 219 | if(daemonized) { |
220 | syslog(LOG_ERR, "Error in %s, line %d: %s", config_name, line, msg); |
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221 | if(value) syslog(LOG_ERR, " - %s", value); |
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222 | syslog(LOG_ERR, "\n"); |
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223 | } |
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224 | else { |
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225 | fprintf(stderr, "Error in %s, line %d: %s", config_name, line, msg); |
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226 | if(value) fprintf(stderr, " - %s", value); |
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227 | fprintf(stderr, "\n"); |
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228 | } |
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1140 | dev | 229 | |
1145 | dev | 230 | return RESULT_ERROR; |
1140 | dev | 231 | } |
232 | |||
1165 | dev | 233 | static int check_abs_path(const char *file_name) |
234 | { |
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235 | if(file_name && file_name[0] != '\0' && file_name[0] != '/') { |
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236 | return print_error("File must have an absolute path", file_name); |
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237 | } |
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238 | |||
239 | return RESULT_OK; |
||
240 | } |
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241 | |||
1156 | dev | 242 | static int read_config(struct config *cfg, int argc, const char* argv[]) |
1140 | dev | 243 | { |
1165 | dev | 244 | int res_cmd_line; |
245 | int res_config_file; |
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1163 | dev | 246 | struct config cmd_cfg; |
247 | struct config file_cfg; |
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1140 | dev | 248 | |
1164 | dev | 249 | memset(cfg, 0, sizeof(struct config)); |
1163 | dev | 250 | res_cmd_line = parse_cmd_line(&cmd_cfg, argc, argv); |
1145 | dev | 251 | if(res_cmd_line != RESULT_OK) return res_cmd_line; |
1165 | dev | 252 | if(check_abs_path(cmd_cfg.config_file) != RESULT_OK) return RESULT_ERROR; |
1140 | dev | 253 | |
1163 | dev | 254 | res_config_file = parse_config_file(&file_cfg, |
255 | cmd_cfg.config_file[0] != '\0' ? cmd_cfg.config_file : DEFAULT_CFG_FILE); |
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1145 | dev | 256 | if(res_config_file != RESULT_OK) return res_config_file; |
1140 | dev | 257 | |
1165 | dev | 258 | if(file_cfg.password[0] == '\0') |
259 | return print_error("Password is not set", NULL); |
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260 | |||
261 | /* save parsed values to general config */ |
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262 | if(cmd_cfg.config_file[0] != '\0') { |
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263 | strncpy(cfg->config_file, cmd_cfg.config_file, sizeof(cfg->config_file)); |
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264 | cfg->config_file_prio = CFG_PRIO_CMD; |
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1140 | dev | 265 | } |
1165 | dev | 266 | else { |
267 | strncpy(cfg->config_file, DEFAULT_CFG_FILE, sizeof(cfg->config_file)); |
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268 | cfg->config_file_prio = CFG_PRIO_DEFAULT; |
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269 | } |
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1140 | dev | 270 | |
1165 | dev | 271 | if(cmd_cfg.interface.s_addr) { |
272 | cfg->interface = cmd_cfg.interface; |
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273 | cfg->interface_prio = CFG_PRIO_CMD; |
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274 | } |
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275 | else if(file_cfg.interface.s_addr) { |
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276 | cfg->interface = file_cfg.interface; |
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277 | cfg->interface_prio = CFG_PRIO_CONFIG; |
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278 | } |
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279 | else { |
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280 | cfg->interface_prio = CFG_PRIO_DEFAULT; |
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281 | } |
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282 | |||
283 | if(cmd_cfg.port) { |
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284 | cfg->port = cmd_cfg.port; |
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285 | cfg->port_prio = CFG_PRIO_CMD; |
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286 | } |
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287 | else if(file_cfg.port) { |
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288 | cfg->port = file_cfg.port; |
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289 | cfg->port_prio = CFG_PRIO_CONFIG; |
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290 | } |
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291 | else { |
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292 | cfg->port = DEFAULT_PORT; |
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293 | cfg->port_prio = CFG_PRIO_DEFAULT; |
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294 | } |
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295 | |||
296 | if(cmd_cfg.pid_file[0] != '\0') { |
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297 | strncpy(cfg->pid_file, cmd_cfg.pid_file, sizeof(cfg->pid_file)); |
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298 | cfg->pid_file_prio = CFG_PRIO_CMD; |
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299 | } |
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300 | else if(file_cfg.pid_file[0] != '\0') { |
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301 | strncpy(cfg->pid_file, file_cfg.pid_file, sizeof(cfg->pid_file)); |
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302 | cfg->pid_file_prio = CFG_PRIO_CONFIG; |
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303 | } |
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304 | else { |
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305 | cfg->pid_file_prio = CFG_PRIO_DEFAULT; |
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306 | } |
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307 | if(check_abs_path(cfg->config_file) != RESULT_OK) return RESULT_ERROR; |
||
308 | |||
309 | strncpy(cfg->password, file_cfg.password, sizeof(cfg->password)); |
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310 | cfg->password_prio = CFG_PRIO_CONFIG; |
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311 | |||
1169 | dev | 312 | cfg->debug_mode = cmd_cfg.debug_mode; |
313 | |||
1165 | dev | 314 | return RESULT_OK; |
315 | } |
||
316 | |||
317 | static int reread_config(struct config *cfg, int *reinit_needed) |
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318 | { |
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319 | int res_config_file; |
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320 | struct config file_cfg; |
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321 | |||
322 | *reinit_needed = 0; |
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323 | |||
324 | res_config_file = parse_config_file(&file_cfg, cfg->config_file); |
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325 | if(res_config_file != RESULT_OK) return res_config_file; |
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326 | |||
327 | if(file_cfg.password[0] == '\0') |
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328 | return print_error("Password is not set", NULL); |
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329 | |||
1163 | dev | 330 | /* save parsed values to general config */ |
1165 | dev | 331 | if(cfg->interface_prio >= CFG_PRIO_CONFIG && cfg->interface.s_addr != file_cfg.interface.s_addr) |
332 | { |
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333 | *reinit_needed = 1; |
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334 | cfg->interface = file_cfg.interface; |
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335 | cfg->interface_prio = CFG_PRIO_CONFIG; |
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336 | } |
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1163 | dev | 337 | |
1165 | dev | 338 | if(cfg->port_prio >= CFG_PRIO_CONFIG && cfg->port != file_cfg.port && file_cfg.port) { |
339 | *reinit_needed = 1; |
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340 | cfg->port = file_cfg.port; |
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341 | cfg->port_prio = CFG_PRIO_CONFIG; |
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342 | } |
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1164 | dev | 343 | |
1165 | dev | 344 | if(check_abs_path(cfg->config_file) != RESULT_OK) return RESULT_ERROR; |
1140 | dev | 345 | |
1163 | dev | 346 | strncpy(cfg->password, file_cfg.password, sizeof(cfg->password)); |
1165 | dev | 347 | cfg->password_prio = CFG_PRIO_CONFIG; |
1163 | dev | 348 | |
1145 | dev | 349 | return RESULT_OK; |
1140 | dev | 350 | } |
351 | |||
1164 | dev | 352 | static int parse_interface(const char *s, char **end, struct in_addr *ip) |
353 | { |
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354 | char buf[MAX_CONFIG_LINE]; |
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355 | int count; |
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356 | const char *c; |
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357 | |||
358 | c = s; |
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359 | count = 0; |
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360 | while(c[0] != '\0' && !isspace(c[0])) c++, count++; |
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361 | if(count > MAX_CONFIG_LINE) return RESULT_ERROR; |
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362 | strncpy(buf, s, count); |
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363 | buf[count] = '\0'; |
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364 | c++; |
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365 | |||
366 | if(end) *end = (char *)c; |
||
367 | |||
368 | if(inet_aton(buf, ip) == 1) |
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369 | return RESULT_OK; |
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370 | else |
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371 | return RESULT_ERROR; |
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372 | } |
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373 | |||
1163 | dev | 374 | static int parse_cmd_line(struct config *cfg, int argc, const char* argv[]) |
1140 | dev | 375 | { |
376 | char *end; |
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377 | int i; |
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1163 | dev | 378 | long port; |
1140 | dev | 379 | |
1163 | dev | 380 | memset(cfg, 0, sizeof(struct config)); |
1140 | dev | 381 | |
382 | for(i = 1; i < argc; i++) { |
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1165 | dev | 383 | if(0 == strcmp(argv[i], PARAM_INTERFACE)) { |
1164 | dev | 384 | if(cfg->interface.s_addr) |
385 | return print_cmd_error(argc, argv, "Interface is already set", NULL); |
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386 | |||
387 | if(++i < argc) { |
||
388 | if(parse_interface(argv[i], (char **)NULL, &cfg->interface) != RESULT_OK) |
||
389 | return print_cmd_error(argc, argv, |
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390 | "Cannot parse interface", argv[i]); |
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391 | } |
||
392 | else { |
||
393 | return print_cmd_error(argc, argv, "Interface expected", NULL); |
||
394 | } |
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395 | } |
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1165 | dev | 396 | else if(0 == strcmp(argv[i], PARAM_PORT)) { |
1164 | dev | 397 | if(cfg->port) |
1145 | dev | 398 | return print_cmd_error(argc, argv, "Port is already set", NULL); |
1140 | dev | 399 | |
400 | if(++i < argc) { |
||
1163 | dev | 401 | port = strtol(argv[i], &end, 10); |
402 | if(*end != '\0' || port < PORT_MIN || port > PORT_MAX) |
||
1145 | dev | 403 | return print_cmd_error(argc, argv, |
404 | "Port number must be integer between 1 and 65535", NULL); |
||
1163 | dev | 405 | cfg->port = (ushort)port; |
1140 | dev | 406 | } |
407 | else { |
||
1145 | dev | 408 | return print_cmd_error(argc, argv, "Port number expected", NULL); |
1140 | dev | 409 | } |
410 | } |
||
1165 | dev | 411 | else if(0 == strcmp(argv[i], PARAM_CONFIG)) { |
1163 | dev | 412 | if(cfg->config_file[0] != '\0') |
1165 | dev | 413 | return print_cmd_error(argc, argv, "Config file name is already set", NULL); |
1140 | dev | 414 | |
415 | if(++i < argc) { |
||
1165 | dev | 416 | strncpy(cfg->config_file, argv[i], FILENAME_MAX); |
417 | if(cfg->config_file[FILENAME_MAX - 1] != '\0') |
||
1155 | dev | 418 | return print_cmd_error(argc, argv, |
419 | "Config file name is too long", NULL); |
||
1140 | dev | 420 | } |
421 | else { |
||
1165 | dev | 422 | return print_cmd_error(argc, argv, "Config file name expected", NULL); |
1140 | dev | 423 | } |
424 | } |
||
1165 | dev | 425 | else if(0 == strcmp(argv[i], PARAM_PID_FILE)) { |
426 | if(cfg->pid_file[0] != '\0') |
||
427 | return print_cmd_error(argc, argv, "PID file name is already set", NULL); |
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428 | |||
429 | if(++i < argc) { |
||
430 | strncpy(cfg->pid_file, argv[i], FILENAME_MAX); |
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431 | if(cfg->pid_file[FILENAME_MAX - 1] != '\0') |
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432 | return print_cmd_error(argc, argv, |
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433 | "PID file name is too long", NULL); |
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434 | } |
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435 | else { |
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436 | return print_cmd_error(argc, argv, "PID file name expected", NULL); |
||
437 | } |
||
438 | } |
||
1169 | dev | 439 | else if(0 == strcmp(argv[i], PARAM_DEBUG)) { |
440 | cfg->debug_mode = 1; |
||
441 | } |
||
1165 | dev | 442 | else if(0 == strcmp(argv[i], PARAM_VERSION)) { |
1145 | dev | 443 | print_version(); |
444 | return RESULT_EXIT; |
||
445 | } |
||
446 | else if(0 == strcmp(argv[i], PARAM_HELP_1) || 0 == strcmp(argv[i], PARAM_HELP_2)) { |
||
447 | pring_usage(argc, argv); |
||
448 | return RESULT_EXIT; |
||
449 | } |
||
1140 | dev | 450 | else { |
1145 | dev | 451 | return print_cmd_error(argc, argv, "Unknown parameter", argv[i]); |
1140 | dev | 452 | } |
453 | } |
||
454 | |||
1145 | dev | 455 | return RESULT_OK; |
1140 | dev | 456 | } |
457 | |||
1164 | dev | 458 | static int validate_equal_sign(const char *config_name, const int count, const char *line, |
459 | uint name_len, char **subline) |
||
460 | { |
||
461 | const char *c; |
||
1140 | dev | 462 | |
1164 | dev | 463 | c = line + name_len - 1; |
464 | if('=' != c[0] && !isspace(c[0])) |
||
465 | return print_config_error(config_name, count, "Unknown config parameter", line); |
||
466 | while(c[0] != '\0' && isspace(c[0])) c++; |
||
467 | if('=' != c[0]) |
||
468 | return print_config_error(config_name, count, "Equal sign expected", NULL); |
||
469 | c++; |
||
470 | |||
471 | if(subline) *subline = (char *)c; |
||
472 | |||
473 | return RESULT_OK; |
||
474 | } |
||
475 | |||
476 | static int validate_eol(const char *config_name, const int count, const char *line) |
||
477 | { |
||
478 | while(line[0] != '\0' && isspace(line[0])) line++; |
||
479 | if('\0' != line[0] && '#' != line[0]) |
||
480 | return print_config_error(config_name, count, "End of line expected", NULL); |
||
481 | |||
482 | return RESULT_OK; |
||
483 | } |
||
484 | |||
1165 | dev | 485 | static int extract_string_value(const char *config_name, const int count, char **subline, int must_quot, |
486 | char *string, uint len) |
||
1164 | dev | 487 | { |
488 | uint cur_len; |
||
1165 | dev | 489 | int quot; |
1164 | dev | 490 | |
491 | while(*subline[0] != '\0' && isspace(*subline[0])) (*subline)++; |
||
1165 | dev | 492 | if('"' == *subline[0]) { |
493 | quot = 1; |
||
494 | (*subline)++; |
||
495 | } |
||
496 | else { |
||
497 | if(must_quot) { |
||
498 | return print_config_error(config_name, count, "Open quot expected", NULL); |
||
499 | } |
||
500 | else { |
||
501 | quot = 0; |
||
502 | /* skip spaces if not quoted */ |
||
503 | while(*subline[0] != '\0' && isspace(*subline[0])) (*subline)++; |
||
504 | } |
||
505 | } |
||
1164 | dev | 506 | |
507 | cur_len = 0; |
||
1165 | dev | 508 | while(*subline[0] != '\0') |
1164 | dev | 509 | { |
1165 | dev | 510 | if(cur_len >= len) return print_config_error(config_name, count, "Value too long", NULL); |
511 | if(quot && *subline[0] == '"') break; |
||
512 | if(!quot && isspace(*subline[0])) break; |
||
513 | |||
1164 | dev | 514 | string[0] = *subline[0]; |
515 | string++; |
||
516 | (*subline)++; |
||
517 | cur_len++; |
||
518 | } |
||
519 | |||
520 | string[0] = '\0'; |
||
1165 | dev | 521 | if(quot) { |
522 | if('"' != *subline[0]) |
||
523 | return print_config_error(config_name, count, "Close quot expected", NULL); |
||
524 | (*subline)++; |
||
525 | } |
||
1164 | dev | 526 | |
527 | return RESULT_OK; |
||
528 | } |
||
529 | |||
1163 | dev | 530 | static int parse_config_file(struct config *cfg, const char *config_name) |
1140 | dev | 531 | { |
532 | FILE *config_file; |
||
533 | char buf[MAX_CONFIG_LINE]; |
||
534 | char *line; |
||
535 | char *subline; |
||
536 | int count; |
||
1156 | dev | 537 | uint len; |
1163 | dev | 538 | long port; |
1164 | dev | 539 | int res; |
1140 | dev | 540 | |
1163 | dev | 541 | memset(cfg, 0, sizeof(struct config)); |
542 | |||
1140 | dev | 543 | config_file = fopen(config_name, "r"); |
1165 | dev | 544 | if(!config_file) |
545 | return print_error("Can not open config file", strerror(errno)); |
||
1140 | dev | 546 | |
547 | count = 0; |
||
548 | while(fgets(buf, sizeof(buf), config_file)) { |
||
549 | count++; |
||
550 | line = buf; |
||
551 | |||
552 | /* skip end spaces */ |
||
1156 | dev | 553 | len = strlen(line); |
1146 | dev | 554 | if(len == MAX_CONFIG_LINE-1) |
555 | return print_config_error(config_name, count, "Line is too long", NULL); |
||
1140 | dev | 556 | while(len && isspace(line[len-1])) --len; |
557 | if(!len) continue; |
||
558 | line[len] = '\0'; |
||
559 | |||
560 | /* skip begin spaces */ |
||
561 | while(line[0] != '\0' && isspace(line[0])) line++; |
||
562 | |||
563 | if('#' == line[0]) { /* skip comment lines */ |
||
564 | continue; |
||
565 | } |
||
1164 | dev | 566 | else if(strncmp(line, CONFIG_INTERFACE, min(sizeof(CONFIG_INTERFACE) - 1, len)) == 0) { |
567 | if((res = validate_equal_sign(config_name, count, line, |
||
568 | sizeof(CONFIG_INTERFACE), &subline)) != RESULT_OK) return res; |
||
569 | |||
570 | if(parse_interface(subline, &subline, &cfg->interface) != RESULT_OK) |
||
571 | return print_config_error(config_name, count, |
||
572 | "Cannot parse interface", NULL); |
||
573 | |||
574 | if((res = validate_eol(config_name, count, subline)) != RESULT_OK) return res; |
||
575 | } |
||
1140 | dev | 576 | else if(strncmp(line, CONFIG_PORT, min(sizeof(CONFIG_PORT) - 1, len)) == 0) { |
1164 | dev | 577 | if((res = validate_equal_sign(config_name, count, line, sizeof(CONFIG_PORT), |
578 | &subline)) != RESULT_OK) return res; |
||
579 | |||
1163 | dev | 580 | port = strtol(subline, &subline, 10); |
581 | if(port < PORT_MIN || port > PORT_MAX) |
||
1140 | dev | 582 | return print_config_error(config_name, count, |
583 | "Port number must be integer between 1 and 65535", NULL); |
||
1164 | dev | 584 | |
585 | if((res = validate_eol(config_name, count, subline)) != RESULT_OK) return res; |
||
1163 | dev | 586 | cfg->port = (ushort)port; |
1140 | dev | 587 | } |
588 | else if(strncmp(line, CONFIG_PASSWORD, min(sizeof(CONFIG_PASSWORD) - 1, len)) == 0) { |
||
1164 | dev | 589 | if((res = validate_equal_sign(config_name, count, line, |
590 | sizeof(CONFIG_PASSWORD), &subline)) != RESULT_OK) return res; |
||
1140 | dev | 591 | |
1165 | dev | 592 | if((res = extract_string_value(config_name, count, &subline, 1, |
1164 | dev | 593 | cfg->password, sizeof(cfg->password))) != RESULT_OK) return res; |
1140 | dev | 594 | |
1164 | dev | 595 | if((res = validate_eol(config_name, count, subline)) != RESULT_OK) return res; |
1140 | dev | 596 | } |
1165 | dev | 597 | else if(strncmp(line, CONFIG_PID_FILE, min(sizeof(CONFIG_PID_FILE) - 1, len)) == 0) { |
598 | if((res = validate_equal_sign(config_name, count, line, |
||
599 | sizeof(CONFIG_PID_FILE), &subline)) != RESULT_OK) return res; |
||
600 | |||
601 | if((res = extract_string_value(config_name, count, &subline, 0, |
||
602 | cfg->pid_file, sizeof(cfg->pid_file))) != RESULT_OK) return res; |
||
603 | |||
604 | if((res = validate_eol(config_name, count, subline)) != RESULT_OK) return res; |
||
605 | } |
||
1140 | dev | 606 | else { |
607 | return print_config_error(config_name, count, "Unknown config parameter", line); |
||
608 | } |
||
609 | } |
||
1164 | dev | 610 | if(ferror(config_file)) { |
1165 | dev | 611 | print_error("Config file reading failed", strerror(errno)); |
1164 | dev | 612 | } |
1140 | dev | 613 | |
1165 | dev | 614 | if(fclose(config_file) != 0) |
615 | return print_error("Can not close config file", strerror(errno)); |
||
1140 | dev | 616 | |
1145 | dev | 617 | return RESULT_OK; |
1140 | dev | 618 | } |
619 | |||
1156 | dev | 620 | static int get_revision(void) |
1145 | dev | 621 | { |
1156 | dev | 622 | int r; |
623 | const char *begin; |
||
1145 | dev | 624 | |
625 | begin = REVISION; |
||
626 | while(begin[0] != '\0' && begin[0] != ':') begin++; |
||
627 | if(begin[0] == '\0') return 0; |
||
628 | begin++; |
||
1156 | dev | 629 | r = (int)strtol(begin, (char**)NULL, 10); |
1145 | dev | 630 | |
631 | return r; |
||
632 | } |
||
633 | |||
1165 | dev | 634 | static int save_pid(const char *pid_file, const pid_t pid) |
635 | { |
||
636 | int fd; |
||
637 | FILE *file; |
||
638 | |||
639 | if(!pid_file || pid_file[0] == '\0') return RESULT_OK; |
||
640 | |||
641 | unlink(pid_file); |
||
642 | |||
643 | fd = open(pid_file, O_WRONLY | O_CREAT | O_EXCL, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH); |
||
644 | if(fd < 0) { |
||
645 | syslog(LOG_ERR, "Can open PID file %s for write: %s\n", pid_file, strerror(errno)); |
||
646 | return RESULT_ERROR; |
||
647 | } |
||
648 | |||
649 | file = fdopen(fd, "w"); |
||
650 | if(!file) { |
||
651 | syslog(LOG_ERR, "Can open PID file %s for write: %s\n", pid_file, strerror(errno)); |
||
652 | return RESULT_ERROR; |
||
653 | } |
||
654 | |||
655 | if(fprintf(file, "%d\n", pid) < 0) { |
||
656 | syslog(LOG_ERR, "Can write PID to file %s: %s\n", pid_file, strerror(errno)); |
||
657 | return RESULT_ERROR; |
||
658 | } |
||
659 | |||
660 | if(fclose(file) != 0) { |
||
661 | syslog(LOG_ERR, "Can not close PID file %s: %s\n", pid_file, strerror(errno)); |
||
662 | return RESULT_UNEXPECTED; |
||
663 | } |
||
664 | |||
665 | return RESULT_OK; |
||
666 | } |
||
667 | |||
1156 | dev | 668 | static int create_child(int soc) |
1143 | dev | 669 | { |
670 | pid_t child; |
||
671 | |||
672 | child = fork(); |
||
673 | if(child == -1) { |
||
674 | fprintf(stderr, "Cannot fork: %s\n", strerror(errno)); |
||
1145 | dev | 675 | return RESULT_UNEXPECTED; /* an unexpected error */ |
1143 | dev | 676 | } |
677 | else if(child > 0) { |
||
1156 | dev | 678 | if(close(soc) != 0) { |
1143 | dev | 679 | fprintf(stderr, "Cannot close socket: %s\n", strerror(errno)); |
1145 | dev | 680 | return RESULT_UNEXPECTED; /* an unexpected error */ |
1143 | dev | 681 | } |
1165 | dev | 682 | |
1145 | dev | 683 | return RESULT_EXIT; /* we are the parent */ |
1143 | dev | 684 | } |
685 | else { |
||
1145 | dev | 686 | return RESULT_OK; /* we are the child */ |
1143 | dev | 687 | } |
688 | } |
||
689 | |||
690 | static int close_descr(int d) |
||
691 | { |
||
692 | if(close(d) != 0) { |
||
693 | syslog(LOG_ERR, "Cannot close descriptor %d: %s\n", d, strerror(errno)); |
||
1145 | dev | 694 | return RESULT_UNEXPECTED; |
1143 | dev | 695 | } |
1145 | dev | 696 | return RESULT_OK; |
1143 | dev | 697 | } |
698 | |||
1165 | dev | 699 | static void delete_pid_file(void) |
700 | { |
||
701 | if(global_cfg.pid_file && global_cfg.pid_file[0] != '\0') { |
||
702 | if(unlink(global_cfg.pid_file) != 0) { |
||
703 | syslog(LOG_ERR, "Cannot delete PID file %s: %s\n", |
||
704 | global_cfg.pid_file, strerror(errno)); |
||
705 | } |
||
706 | } |
||
707 | } |
||
708 | |||
1169 | dev | 709 | static void reconfig_signal(void) |
710 | { |
||
711 | syslog(LOG_INFO, "reconfig"); |
||
712 | reconfig_required = 1; |
||
713 | } |
||
714 | |||
1165 | dev | 715 | static void quit_signal(void) |
716 | { |
||
717 | syslog(LOG_WARNING, "quit"); |
||
1169 | dev | 718 | quit_required = 1; |
1165 | dev | 719 | } |
720 | |||
721 | static void signal_handler(int sig) |
||
722 | { |
||
723 | int saved_errno = errno; |
||
724 | |||
725 | switch(sig) { |
||
726 | case SIGHUP: |
||
727 | reconfig_signal(); |
||
728 | break; |
||
729 | |||
730 | case SIGINT: |
||
731 | case SIGTERM: |
||
732 | case SIGQUIT: |
||
733 | quit_signal(); |
||
734 | break; |
||
735 | } |
||
736 | |||
737 | errno = saved_errno; |
||
738 | } |
||
739 | |||
740 | static int init_signal_handler(int sig) |
||
741 | { |
||
742 | struct sigaction sa; |
||
743 | |||
744 | sa.sa_flags = 0; |
||
745 | sa.sa_handler = signal_handler; |
||
746 | sigemptyset(&sa.sa_mask); |
||
747 | |||
748 | if(sigaction(sig, &sa, (struct sigaction *)NULL) != 0) { |
||
749 | syslog(LOG_ERR, "Cannot register handler for signal %d: %s\n", sig, strerror(errno)); |
||
750 | return RESULT_UNEXPECTED; |
||
751 | } |
||
752 | |||
753 | return RESULT_OK; |
||
754 | } |
||
755 | |||
756 | static int init_signals(void) |
||
757 | { |
||
758 | if(init_signal_handler(SIGHUP) != RESULT_OK) return RESULT_UNEXPECTED; |
||
759 | if(init_signal_handler(SIGINT) != RESULT_OK) return RESULT_UNEXPECTED; |
||
760 | if(init_signal_handler(SIGTERM) != RESULT_OK) return RESULT_UNEXPECTED; |
||
761 | if(init_signal_handler(SIGQUIT) != RESULT_OK) return RESULT_UNEXPECTED; |
||
762 | |||
763 | return RESULT_OK; |
||
764 | } |
||
765 | |||
766 | static void check_return(int res) |
||
767 | { |
||
768 | if(daemonized && res != RESULT_OK) { |
||
769 | delete_pid_file(); |
||
770 | syslog(LOG_WARNING, "quit"); |
||
771 | } |
||
772 | |||
773 | switch(res) { |
||
774 | case RESULT_EXIT: exit(EXIT_OK); return; /* no error but exit */ |
||
775 | case RESULT_ERROR: exit(EXIT_USER_ERROR); return; /* user error */ |
||
776 | case RESULT_UNEXPECTED: exit(EXIT_UNEXPECTED); return; /* unexpected error */ |
||
777 | } |
||
778 | } |
||
779 | |||
1156 | dev | 780 | int main(int argc, const char* argv[]) |
1140 | dev | 781 | { |
1165 | dev | 782 | int soc; |
783 | int reinit_needed; |
||
1140 | dev | 784 | |
1143 | dev | 785 | /* get config */ |
1165 | dev | 786 | check_return(read_config(&global_cfg, argc, argv)); |
1143 | dev | 787 | |
788 | /* try to listen the port */ |
||
1165 | dev | 789 | if((soc = establish(&global_cfg)) < 0) { |
790 | fprintf(stderr, "Cannot listen to port %i\n", global_cfg.port); |
||
1145 | dev | 791 | return EXIT_USER_ERROR; |
1140 | dev | 792 | } |
793 | |||
1143 | dev | 794 | /* fork and release the console */ |
1165 | dev | 795 | check_return(create_child(soc)); |
1140 | dev | 796 | |
1143 | dev | 797 | /* continue as first child */ |
798 | if(setsid() == -1) { |
||
799 | fprintf(stderr, "Cannot create session: %s\n", strerror(errno)); |
||
1145 | dev | 800 | return EXIT_UNEXPECTED; |
1143 | dev | 801 | } |
802 | |||
803 | /* fork the second time */ |
||
1165 | dev | 804 | check_return(create_child(soc)); |
805 | |||
806 | /* continue as final child */ |
||
807 | if(init_signals() != RESULT_OK) return EXIT_UNEXPECTED; |
||
808 | |||
809 | if(chdir("/") < 0) { |
||
810 | fprintf(stderr, "Cannot chdir to /: %s\n", strerror(errno)); |
||
811 | return EXIT_UNEXPECTED; |
||
1143 | dev | 812 | } |
1165 | dev | 813 | umask(0); |
814 | check_return(save_pid(global_cfg.pid_file, getpid())); |
||
815 | daemonized = 1; |
||
1143 | dev | 816 | |
1165 | dev | 817 | /* from now do not use console for error output */ |
1145 | dev | 818 | if(close_descr(0) != RESULT_OK) return EXIT_UNEXPECTED; |
819 | if(close_descr(1) != RESULT_OK) return EXIT_UNEXPECTED; |
||
820 | if(close_descr(2) != RESULT_OK) return EXIT_UNEXPECTED; |
||
1143 | dev | 821 | |
1165 | dev | 822 | for(;;) { |
823 | syslog(LOG_INFO, "listen on %d", global_cfg.port); |
||
824 | listen_socket(&global_cfg, soc); |
||
1143 | dev | 825 | |
1169 | dev | 826 | if(quit_required) { |
827 | break; |
||
828 | } |
||
829 | else if(reconfig_required) { |
||
830 | reconfig_required = 0; |
||
1165 | dev | 831 | check_return(reread_config(&global_cfg, &reinit_needed)); |
832 | if(reinit_needed) { |
||
833 | close(soc); |
||
834 | |||
835 | if((soc = establish(&global_cfg)) < 0) { |
||
836 | syslog(LOG_ERR, "Cannot listen to port %i\n", global_cfg.port); |
||
837 | check_return(RESULT_ERROR); |
||
838 | } |
||
839 | } |
||
840 | } |
||
841 | } |
||
842 | |||
1169 | dev | 843 | delete_pid_file(); |
844 | return EXIT_OK; |
||
1140 | dev | 845 | } |
846 |