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

224 lines
7.8 KiB
C
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/**
* sesimos - secure, simple, modern web server
* @brief Configuration file loader
* @file src/lib/config.c
* @author Lorenz Stechauner
* @date 2021-01-05
*/
#include "../logger.h"
#include "config.h"
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
config_t config;
int config_load(const char *filename) {
FILE *file = fopen(filename, "r");
if (file == NULL) {
critical("Unable to open config file");
return -1;
}
memset(&config, 0, sizeof(config));
int i = 0;
int j = 0;
int line_num = 0;
int mode = 0;
char section = 0;
char *source, *target;
char *line = NULL;
ssize_t read;
size_t line_len = 0;
while ((read = getline(&line, &line_len, file)) != -1) {
line_num++;
char *ptr = line;
char *comment = strpbrk(ptr, "#\r\n");
if (comment != NULL) comment[0] = 0;
unsigned long 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(config.hosts[i].name, sizeof(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(config.certs[j].name, sizeof(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 = config.geoip_dir;
} else if (len > 11 && strncmp(ptr, "dns_server", 10) == 0 && (ptr[10] == ' ' || ptr[10] == '\t')) {
source = ptr + 10;
target = config.dns_server;
} else {
goto err;
}
} else if (section == 'c') {
cert_config_t *cc = &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_t *hc = &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->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->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->proxy.enc = 1;
}
continue;
} else {
goto err;
}
} else {
goto err;
}
while (source[0] == ' ' || source[0] == '\t') source++;
if (strlen(source) == 0) {
err:
critical("Unable to parse config file (line %i)", line);
return -2;
}
if (target != NULL) {
strcpy(target, source);
} else if (mode == 1) {
if (strcmp(source, "forbidden") == 0) {
config.hosts[i - 1].local.dir_mode = URI_DIR_MODE_FORBIDDEN;
} else if (strcmp(source, "info") == 0) {
config.hosts[i - 1].local.dir_mode = URI_DIR_MODE_INFO;
} else if (strcmp(source, "list") == 0) {
config.hosts[i - 1].local.dir_mode = URI_DIR_MODE_LIST;
} else {
goto err;
}
} else if (mode == 2) {
config.hosts[i - 1].proxy.port = (unsigned short) strtoul(source, NULL, 10);
}
}
free(line);
for (int k = 0; k < i; k++) {
host_config_t *hc = &config.hosts[k];
if (hc->type == CONFIG_TYPE_LOCAL) {
char *webroot = 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(config.certs[m].name, hc->cert_name) == 0) {
hc->cert = m;
found = 1;
break;
}
}
if (!found) {
err2:
critical("Unable to parse config file");
return -2;
}
}
return 0;
}
host_config_t *get_host_config(const char *host) {
for (int i = 0; i < CONFIG_MAX_HOST_CONFIG; i++) {
host_config_t *hc = &config.hosts[i];
if (hc->type == CONFIG_TYPE_UNSET) break;
if (strcmp(hc->name, host) == 0) return hc;
if (hc->name[0] == '*' && hc->name[1] == '.') {
const char *pos = strstr(host, hc->name + 1);
if (pos != NULL && strlen(pos) == strlen(hc->name + 1)) return hc;
}
}
return NULL;
}
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