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

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C
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/**
* sesimos - secure, simple, modern 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>
t_config *config;
char geoip_dir[256], dns_server[256];
int config_init() {
int shm_id = shmget(CONFIG_SHM_KEY, sizeof(t_config), IPC_CREAT | IPC_EXCL | 0640);
if (shm_id < 0) {
fprintf(stderr, ERR_STR "Unable to create config 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 config 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 config shared memory (rw): %s" CLR_STR "\n", strerror(errno));
return -3;
}
config = shm_rw;
memset(config, 0, sizeof(t_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 config 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 config 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 = alloca(len + 1);
fread(conf, 1, len, file);
conf[len] = 0;
fclose(file);
t_config *tmp_config = malloc(sizeof(t_config));
memset(tmp_config, 0, sizeof(t_config));
int i = 0;
int j = 0;
int line = 0;
int mode = 0;
char section = 0;
char *ptr = NULL;
char *source, *target;
while ((ptr = strsep(&conf, "\r\n")) != NULL) {
line++;
char *comment = strchr(ptr, '#');
if (comment != NULL) comment[0] = 0;
len = strlen(ptr);
char *end_ptr = ptr + len - 1;
while (end_ptr[0] == ' ' || end_ptr[0] == '\t') {
end_ptr[0] = 0;
end_ptr--;
}
len = strlen(ptr);
if (len == 0) continue;
if (ptr[0] == '[') {
if (ptr[len - 1] != ']') goto err;
ptr++;
int l = 0;
if (strncmp(ptr, "host", 4) == 0 && (ptr[4] == ' ' || ptr[4] == '\t')) {
ptr += 4;
while (ptr[0] == ' ' || ptr[0] == '\t' || ptr[0] == ']') ptr++;
while (ptr[l] != ' ' && ptr[l] != '\t' && ptr[l] != ']') l++;
if (l == 0) goto err;
snprintf(tmp_config->hosts[i].name, sizeof(tmp_config->hosts[i].name), "%.*s", l, ptr);
i++;
section = 'h';
} else if (strncmp(ptr, "cert", 4) == 0 && (ptr[4] == ' ' || ptr[4] == '\t')) {
ptr += 4;
while (ptr[0] == ' ' || ptr[0] == '\t' || ptr[0] == ']') ptr++;
while (ptr[l] != ' ' && ptr[l] != '\t' && ptr[l] != ']') l++;
if (l == 0) goto err;
snprintf(tmp_config->certs[j].name, sizeof(tmp_config->certs[j].name), "%.*s", l, ptr);
j++;
section = 'c';
} else {
goto err;
}
continue;
} else if (section == 0) {
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 {
goto err;
}
} else if (section == 'c') {
cert_config *cc = &tmp_config->certs[j - 1];
if (len > 12 && strncmp(ptr, "certificate", 11) == 0 && (ptr[11] == ' ' || ptr[11] == '\t')) {
source = ptr + 11;
target = cc->full_chain;
} else if (len > 12 && strncmp(ptr, "private_key", 11) == 0 && (ptr[11] == ' ' || ptr[11] == '\t')) {
source = ptr + 11;
target = cc->priv_key;
} else {
goto err;
}
} else if (section == 'h') {
host_config *hc = &tmp_config->hosts[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 > 5 && strncmp(ptr, "cert", 4) == 0 && (ptr[4] == ' ' || ptr[4] == '\t')) {
source = ptr + 4;
target = hc->cert_name;
} 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;
} else {
goto err;
}
} else {
goto err;
}
while (source[0] == ' ' || source[0] == '\t') source++;
if (strlen(source) == 0) {
err:
free(tmp_config);
fprintf(stderr, ERR_STR "Unable to parse config file (line %i)" CLR_STR "\n", line);
return -2;
}
if (target != NULL) {
strcpy(target, source);
} else if (mode == 1) {
if (strcmp(source, "forbidden") == 0) {
tmp_config->hosts[i - 1].local.dir_mode = URI_DIR_MODE_FORBIDDEN;
} else if (strcmp(source, "info") == 0) {
tmp_config->hosts[i - 1].local.dir_mode = URI_DIR_MODE_INFO;
} else if (strcmp(source, "list") == 0) {
tmp_config->hosts[i - 1].local.dir_mode = URI_DIR_MODE_LIST;
} else {
goto err;
}
} else if (mode == 2) {
tmp_config->hosts[i - 1].rev_proxy.port = (unsigned short) strtoul(source, NULL, 10);
}
}
for (int k = 0; k < i; k++) {
host_config *hc = &tmp_config->hosts[k];
if (hc->type == CONFIG_TYPE_LOCAL) {
char *webroot = tmp_config->hosts[k].local.webroot;
if (webroot[strlen(webroot) - 1] == '/') {
webroot[strlen(webroot) - 1] = 0;
}
}
if (hc->cert_name[0] == 0) goto err2;
int found = 0;
for (int m = 0; m < j; m++) {
if (strcmp(tmp_config->certs[m].name, hc->cert_name) == 0) {
hc->cert = m;
found = 1;
break;
}
}
if (!found) {
err2:
free(tmp_config);
fprintf(stderr, ERR_STR "Unable to parse config file" CLR_STR "\n");
return -2;
}
}
int shm_id = shmget(CONFIG_SHM_KEY, 0, 0);
if (shm_id < 0) {
fprintf(stderr, ERR_STR "Unable to get config 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 config shared memory (rw): %s" CLR_STR "\n", strerror(errno));
return -4;
}
memcpy(shm_rw, tmp_config, sizeof(t_config));
free(tmp_config);
shmdt(shm_rw);
return 0;
}
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