lorenz.stechauner/sesimos
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sesimos/src/lib/config.c

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