201 lines
7.1 KiB
C
201 lines
7.1 KiB
C
/**
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* Necronda Web Server
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* Configuration file loader
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* src/config.c
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* Lorenz Stechauner, 2021-01-05
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*/
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#include "config.h"
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#include "uri.h"
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#include <sys/ipc.h>
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#include <sys/shm.h>
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int config_init() {
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int shm_id = shmget(SHM_KEY_CONFIG, MAX_HOST_CONFIG * sizeof(host_config), IPC_CREAT | IPC_EXCL | 0640);
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if (shm_id < 0) {
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fprintf(stderr, ERR_STR "Unable to create shared memory: %s" CLR_STR "\n", strerror(errno));
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return -1;
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}
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void *shm = shmat(shm_id, NULL, SHM_RDONLY);
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if (shm == (void *) -1) {
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fprintf(stderr, ERR_STR "Unable to attach shared memory (ro): %s" CLR_STR "\n", strerror(errno));
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return -2;
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}
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config = shm;
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void *shm_rw = shmat(shm_id, NULL, 0);
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if (shm_rw == (void *) -1) {
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fprintf(stderr, ERR_STR "Unable to attach shared memory (rw): %s" CLR_STR "\n", strerror(errno));
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return -3;
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}
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config = shm_rw;
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memset(config, 0, MAX_HOST_CONFIG * sizeof(host_config));
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shmdt(shm_rw);
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config = shm;
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return 0;
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}
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int config_unload() {
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int shm_id = shmget(SHM_KEY_CONFIG, 0, 0);
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if (shm_id < 0) {
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fprintf(stderr, ERR_STR "Unable to get shared memory id: %s" CLR_STR "\n", strerror(errno));
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shmdt(config);
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return -1;
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} else if (shmctl(shm_id, IPC_RMID, NULL) < 0) {
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fprintf(stderr, ERR_STR "Unable to configure shared memory: %s" CLR_STR "\n", strerror(errno));
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shmdt(config);
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return -1;
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}
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shmdt(config);
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return 0;
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}
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int config_load(const char *filename) {
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FILE *file = fopen(filename, "r");
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if (file == NULL) {
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fprintf(stderr, ERR_STR "Unable to open config file: %s" CLR_STR "\n", strerror(errno));
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return -1;
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}
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fseek(file, 0, SEEK_END);
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unsigned long len = ftell(file);
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fseek(file, 0, SEEK_SET);
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char *conf = malloc(len);
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fread(conf, 1, len, file);
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fclose(file);
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host_config *tmp_config = malloc(MAX_HOST_CONFIG * sizeof(host_config));
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memset(tmp_config, 0, MAX_HOST_CONFIG * sizeof(host_config));
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int i = 0;
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int mode = 0;
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char *ptr = NULL;
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char host[256], *source, *target;
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host[0] = 0;
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while ((ptr = strtok(ptr == NULL ? conf : NULL, "\n")) != NULL) {
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char *comment = strchr(ptr, '#');
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if (comment != NULL) comment[0] = 0;
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len = strlen(ptr);
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if (ptr[0] == '[') {
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if (ptr[len - 1] != ']') goto err;
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strncpy(tmp_config[i].name, ptr + 1, len - 2);
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i++;
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continue;
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} else if (i == 0) {
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if (len > 12 && strncmp(ptr, "certificate", 11) == 0 && (ptr[11] == ' ' || ptr[11] == '\t')) {
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source = ptr + 11;
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target = cert_file;
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} else if (len > 12 && strncmp(ptr, "private_key", 11) == 0 && (ptr[11] == ' ' || ptr[11] == '\t')) {
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source = ptr + 11;
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target = key_file;
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} else if (len > 10 && strncmp(ptr, "geoip_dir", 9) == 0 && (ptr[9] == ' ' || ptr[9] == '\t')) {
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source = ptr + 9;
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target = geoip_dir;
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} else if (len > 11 && strncmp(ptr, "dns_server", 10) == 0 && (ptr[10] == ' ' || ptr[10] == '\t')) {
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source = ptr + 10;
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target = dns_server;
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}
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} else {
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host_config *hc = &tmp_config[i - 1];
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if (len > 8 && strncmp(ptr, "webroot", 7) == 0 && (ptr[7] == ' ' || ptr[7] == '\t')) {
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source = ptr + 7;
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target = hc->local.webroot;
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if (hc->type != 0 && hc->type != CONFIG_TYPE_LOCAL) {
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goto err;
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} else {
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hc->type = CONFIG_TYPE_LOCAL;
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}
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} else if (len > 9 && strncmp(ptr, "dir_mode", 8) == 0 && (ptr[8] == ' ' || ptr[8] == '\t')) {
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source = ptr + 8;
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target = NULL;
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mode = 1;
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if (hc->type != 0 && hc->type != CONFIG_TYPE_LOCAL) {
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goto err;
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} else {
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hc->type = CONFIG_TYPE_LOCAL;
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}
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} else if (len > 9 && strncmp(ptr, "hostname", 8) == 0 && (ptr[8] == ' ' || ptr[8] == '\t')) {
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source = ptr + 8;
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target = hc->rev_proxy.hostname;
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if (hc->type != 0 && hc->type != CONFIG_TYPE_REVERSE_PROXY) {
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goto err;
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} else {
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hc->type = CONFIG_TYPE_REVERSE_PROXY;
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}
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} else if (len > 5 && strncmp(ptr, "port", 4) == 0 && (ptr[4] == ' ' || ptr[4] == '\t')) {
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source = ptr + 4;
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target = NULL;
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mode = 2;
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if (hc->type != 0 && hc->type != CONFIG_TYPE_REVERSE_PROXY) {
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goto err;
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} else {
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hc->type = CONFIG_TYPE_REVERSE_PROXY;
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}
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} else if (strcmp(ptr, "http") == 0) {
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if (hc->type != 0 && hc->type != CONFIG_TYPE_REVERSE_PROXY) {
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goto err;
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} else {
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hc->type = CONFIG_TYPE_REVERSE_PROXY;
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hc->rev_proxy.enc = 0;
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}
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continue;
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} else if (strcmp(ptr, "https") == 0) {
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if (hc->type != 0 && hc->type != CONFIG_TYPE_REVERSE_PROXY) {
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goto err;
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} else {
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hc->type = CONFIG_TYPE_REVERSE_PROXY;
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hc->rev_proxy.enc = 1;
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}
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continue;
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}
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}
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char *end_ptr = source + strlen(source) - 1;
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while (source[0] == ' ' || source[0] == '\t') source++;
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while (end_ptr[0] == ' ' || end_ptr[0] == '\t') end_ptr--;
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if (end_ptr <= source) {
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err:
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free(conf);
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free(tmp_config);
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fprintf(stderr, ERR_STR "Unable to parse config file" CLR_STR "\n");
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return -2;
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}
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end_ptr[1] = 0;
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if (target != NULL) {
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strcpy(target, source);
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} else if (mode == 1) {
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if (strcmp(source, "forbidden") == 0) {
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tmp_config[i - 1].local.dir_mode = URI_DIR_MODE_FORBIDDEN;
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} else if (strcmp(source, "info") == 0) {
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tmp_config[i - 1].local.dir_mode = URI_DIR_MODE_INFO;
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} else if (strcmp(source, "list") == 0) {
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tmp_config[i - 1].local.dir_mode = URI_DIR_MODE_LIST;
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} else {
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goto err;
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}
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} else if (mode == 2) {
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tmp_config[i - 1].rev_proxy.port = (unsigned short) strtoul(source, NULL, 10);
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}
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}
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free(conf);
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int shm_id = shmget(SHM_KEY_CONFIG, 0, 0);
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if (shm_id < 0) {
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fprintf(stderr, ERR_STR "Unable to get shared memory id: %s" CLR_STR "\n", strerror(errno));
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shmdt(config);
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return -3;
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}
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void *shm_rw = shmat(shm_id, NULL, 0);
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if (shm_rw == (void *) -1) {
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free(tmp_config);
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fprintf(stderr, ERR_STR "Unable to attach shared memory (rw): %s" CLR_STR "\n", strerror(errno));
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return -4;
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}
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memcpy(shm_rw, tmp_config, MAX_HOST_CONFIG * sizeof(host_config));
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free(tmp_config);
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shmdt(shm_rw);
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return 0;
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}
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