lorenz.stechauner/sesimos
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sesimos/src/server.c

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/**
* Necronda Web Server
* Main executable
* src/necronda-server.c
* Lorenz Stechauner, 2020-12-03
*/
#define _POSIX_C_SOURCE 199309L
#include "necronda.h"
#include "server.h"
#include "client.h"
#include "lib/cache.h"
#include "lib/config.h"
#include "lib/sock.h"
#include "lib/rev_proxy.h"
#include "lib/geoip.h"
#include "lib/utils.h"
#include <stdio.h>
#include <sys/socket.h>
#include <signal.h>
#include <unistd.h>
#include <sys/select.h>
#include <string.h>
#include <errno.h>
#include <arpa/inet.h>
#include <wait.h>
#include <sys/types.h>
#include <openssl/err.h>
#include <openssl/pem.h>
#include <openssl/ssl.h>
#include <openssl/conf.h>
#include <dirent.h>
int active = 1;
const char *config_file;
int sockets[NUM_SOCKETS];
pid_t children[MAX_CHILDREN];
MMDB_s mmdbs[MAX_MMDB];
SSL_CTX *contexts[CONFIG_MAX_CERT_CONFIG];
void openssl_init() {
SSL_library_init();
SSL_load_error_strings();
ERR_load_BIO_strings();
OpenSSL_add_all_algorithms();
}
static int ssl_servername_cb(SSL *ssl, int *ad, void *arg) {
const char *servername = SSL_get_servername(ssl, TLSEXT_NAMETYPE_host_name);
if (servername != NULL) {
const host_config *conf = get_host_config(servername);
if (conf != NULL) SSL_set_SSL_CTX(ssl, contexts[conf->cert]);
}
return SSL_TLSEXT_ERR_OK;
}
void destroy() {
fprintf(stderr, "\n" ERR_STR "Terminating forcefully!" CLR_STR "\n");
int status = 0;
int ret;
int kills = 0;
for (int i = 0; i < MAX_CHILDREN; i++) {
if (children[i] != 0) {
ret = waitpid(children[i], &status, WNOHANG);
if (ret < 0) {
fprintf(stderr, ERR_STR "Unable to wait for child process (PID %i): %s" CLR_STR "\n", children[i], strerror(errno));
} else if (ret == children[i]) {
children[i] = 0;
if (status != 0) {
fprintf(stderr, ERR_STR "Child process with PID %i terminated with exit code %i" CLR_STR "\n", ret, status);
}
} else {
kill(children[i], SIGKILL);
kills++;
}
}
}
if (kills > 0) {
fprintf(stderr, ERR_STR "Killed %i child process(es)" CLR_STR "\n", kills);
}
cache_unload();
config_unload();
exit(2);
}
void terminate() {
fprintf(stderr, "\nTerminating gracefully...\n");
active = 0;
signal(SIGINT, destroy);
signal(SIGTERM, destroy);
for (int i = 0; i < NUM_SOCKETS; i++) {
shutdown(sockets[i], SHUT_RDWR);
close(sockets[i]);
}
int status = 0;
int wait_num = 0;
int ret;
for (int i = 0; i < MAX_CHILDREN; i++) {
if (children[i] != 0) {
ret = waitpid(children[i], &status, WNOHANG);
if (ret < 0) {
fprintf(stderr, ERR_STR "Unable to wait for child process (PID %i): %s" CLR_STR "\n", children[i], strerror(errno));
} else if (ret == children[i]) {
children[i] = 0;
if (status != 0) {
fprintf(stderr, ERR_STR "Child process with PID %i terminated with exit code %i" CLR_STR "\n", ret, status);
}
} else {
kill(children[i], SIGTERM);
wait_num++;
}
}
}
if (wait_num > 0) {
fprintf(stderr, "Waiting for %i child process(es)...\n", wait_num);
}
for (int i = 0; i < MAX_CHILDREN; i++) {
if (children[i] != 0) {
ret = waitpid(children[i], &status, 0);
if (ret < 0) {
fprintf(stderr, ERR_STR "Unable to wait for child process (PID %i): %s" CLR_STR "\n", children[i], strerror(errno));
} else if (ret == children[i]) {
children[i] = 0;
if (status != 0) {
fprintf(stderr, ERR_STR "Child process with PID %i terminated with exit code %i" CLR_STR "\n", ret, status);
}
}
}
}
if (wait_num > 0) {
// Wait another 50 ms to let child processes write to stdout/stderr
signal(SIGINT, SIG_IGN);
signal(SIGTERM, SIG_IGN);
struct timespec ts = {.tv_sec = 0, .tv_nsec = 50000000};
nanosleep(&ts, &ts);
fprintf(stderr, "\nGoodbye\n");
} else {
fprintf(stderr, "Goodbye\n");
}
cache_unload();
config_unload();
exit(0);
}
int main(int argc, const char *argv[]) {
const int YES = 1;
fd_set socket_fds, read_socket_fds;
int max_socket_fd = 0;
int ready_sockets_num;
long client_num = 0;
char buf[1024];
int ret;
int client_fd;
sock client;
struct sockaddr_in6 client_addr;
unsigned int client_addr_len = sizeof(client_addr);
memset(sockets, 0, sizeof(sockets));
memset(children, 0, sizeof(children));
memset(mmdbs, 0, sizeof(mmdbs));
struct timeval timeout;
const struct sockaddr_in6 addresses[2] = {
{.sin6_family = AF_INET6, .sin6_addr = IN6ADDR_ANY_INIT, .sin6_port = htons(80)},
{.sin6_family = AF_INET6, .sin6_addr = IN6ADDR_ANY_INIT, .sin6_port = htons(443)}
};
if (setvbuf(stdout, NULL, _IOLBF, 0) != 0) {
fprintf(stderr, ERR_STR "Unable to set stdout to line-buffered mode: %s" CLR_STR, strerror(errno));
return 1;
}
printf("Necronda Web Server " NECRONDA_VERSION "\n");
ret = config_init();
if (ret != 0) {
return 1;
}
config_file = NULL;
for (int i = 1; i < argc; i++) {
const char *arg = argv[i];
if (strcmp(arg, "-h") == 0 || strcmp(arg, "--help") == 0) {
printf("Usage: necronda-server [-h] [-c <CONFIG-FILE>]\n"
"\n"
"Options:\n"
" -c, --config <CONFIG-FILE> path to the config file. If not provided, default will be used\n"
" -h, --help print this dialogue\n");
config_unload();
return 0;
} else if (strcmp(arg, "-c") == 0 || strcmp(arg, "--config") == 0) {
if (i == argc - 1) {
fprintf(stderr, ERR_STR "Unable to parse argument %s, usage: --config <CONFIG-FILE>" CLR_STR "\n", arg);
config_unload();
return 1;
}
config_file = argv[++i];
} else {
fprintf(stderr, ERR_STR "Unable to parse argument '%s'" CLR_STR "\n", arg);
config_unload();
return 1;
}
}
ret = config_load(config_file == NULL ? DEFAULT_CONFIG_FILE : config_file);
if (ret != 0) {
config_unload();
return 1;
}
sockets[0] = socket(AF_INET6, SOCK_STREAM, 0);
if (sockets[0] < 0) goto socket_err;
sockets[1] = socket(AF_INET6, SOCK_STREAM, 0);
if (sockets[1] < 0) {
socket_err:
fprintf(stderr, ERR_STR "Unable to create socket: %s" CLR_STR "\n", strerror(errno));
config_unload();
return 1;
}
for (int i = 0; i < NUM_SOCKETS; i++) {
if (setsockopt(sockets[i], SOL_SOCKET, SO_REUSEADDR, &YES, sizeof(YES)) < 0) {
fprintf(stderr, ERR_STR "Unable to set options for socket %i: %s" CLR_STR "\n", i, strerror(errno));
config_unload();
return 1;
}
}
if (bind(sockets[0], (struct sockaddr *) &addresses[0], sizeof(addresses[0])) < 0) goto bind_err;
if (bind(sockets[1], (struct sockaddr *) &addresses[1], sizeof(addresses[1])) < 0) {
bind_err:
fprintf(stderr, ERR_STR "Unable to bind socket to address: %s" CLR_STR "\n", strerror(errno));
config_unload();
return 1;
}
signal(SIGINT, terminate);
signal(SIGTERM, terminate);
if (geoip_dir[0] != 0) {
DIR *geoip = opendir(geoip_dir);
if (geoip == NULL) {
fprintf(stderr, ERR_STR "Unable to open GeoIP dir: %s" CLR_STR "\n", strerror(errno));
config_unload();
return 1;
}
struct dirent *dir;
int i = 0;
while ((dir = readdir(geoip)) != NULL) {
if (strcmp(dir->d_name + strlen(dir->d_name) - 5, ".mmdb") != 0) continue;
if (i >= MAX_MMDB) {
fprintf(stderr, ERR_STR "Too many .mmdb files" CLR_STR "\n");
config_unload();
return 1;
}
sprintf(buf, "%s/%s", geoip_dir, dir->d_name);
ret = MMDB_open(buf, 0, &mmdbs[i]);
if (ret != MMDB_SUCCESS) {
fprintf(stderr, ERR_STR "Unable to open .mmdb file: %s" CLR_STR "\n", MMDB_strerror(ret));
config_unload();
return 1;
}
i++;
}
if (i == 0) {
fprintf(stderr, ERR_STR "No .mmdb files found in %s" CLR_STR "\n", geoip_dir);
config_unload();
return 1;
}
closedir(geoip);
}
ret = cache_init();
if (ret < 0) {
config_unload();
return 1;
} else if (ret != 0) {
children[0] = ret; // pid
} else {
return 0;
}
openssl_init();
client.buf = NULL;
client.buf_len = 0;
client.buf_off = 0;
for (int i = 0; i < CONFIG_MAX_CERT_CONFIG; i++) {
const cert_config *conf = &config->certs[i];
if (conf->name[0] == 0) break;
contexts[i] = SSL_CTX_new(TLS_server_method());
SSL_CTX *ctx = contexts[i];
SSL_CTX_set_options(ctx, SSL_OP_SINGLE_DH_USE);
SSL_CTX_set_verify(ctx, SSL_VERIFY_NONE, NULL);
SSL_CTX_set_min_proto_version(ctx, TLS1_2_VERSION);
SSL_CTX_set_mode(ctx, SSL_MODE_ENABLE_PARTIAL_WRITE);
SSL_CTX_set_cipher_list(ctx, "HIGH:!aNULL:!kRSA:!PSK:!SRP:!MD5:!RC4");
SSL_CTX_set_ecdh_auto(ctx, 1);
SSL_CTX_set_tlsext_servername_callback(ctx, ssl_servername_cb);
if (SSL_CTX_use_certificate_chain_file(ctx, conf->full_chain) != 1) {
fprintf(stderr, ERR_STR "Unable to load certificate chain file: %s: %s" CLR_STR "\n", ERR_reason_error_string(ERR_get_error()), conf->full_chain);
config_unload();
cache_unload();
return 1;
}
if (SSL_CTX_use_PrivateKey_file(ctx, conf->priv_key, SSL_FILETYPE_PEM) != 1) {
fprintf(stderr, ERR_STR "Unable to load private key file: %s: %s" CLR_STR "\n", ERR_reason_error_string(ERR_get_error()), conf->priv_key);
config_unload();
cache_unload();
return 1;
}
}
client.ctx = contexts[0];
rev_proxy_preload();
for (int i = 0; i < NUM_SOCKETS; i++) {
if (listen(sockets[i], LISTEN_BACKLOG) < 0) {
fprintf(stderr, ERR_STR "Unable to listen on socket %i: %s" CLR_STR "\n", i, strerror(errno));
config_unload();
cache_unload();
return 1;
}
}
FD_ZERO(&socket_fds);
for (int i = 0; i < NUM_SOCKETS; i++) {
FD_SET(sockets[i], &socket_fds);
if (sockets[i] > max_socket_fd) {
max_socket_fd = sockets[i];
}
}
fprintf(stderr, "Ready to accept connections\n");
while (active) {
timeout.tv_sec = 1;
timeout.tv_usec = 0;
read_socket_fds = socket_fds;
ready_sockets_num = select(max_socket_fd + 1, &read_socket_fds, NULL, NULL, &timeout);
if (ready_sockets_num < 0) {
fprintf(stderr, ERR_STR "Unable to select sockets: %s" CLR_STR "\n", strerror(errno));
terminate();
return 1;
}
for (int i = 0; i < NUM_SOCKETS; i++) {
if (FD_ISSET(sockets[i], &read_socket_fds)) {
client_fd = accept(sockets[i], (struct sockaddr *) &client_addr, &client_addr_len);
if (client_fd < 0) {
fprintf(stderr, ERR_STR "Unable to accept connection: %s" CLR_STR "\n", strerror(errno));
continue;
}
pid_t pid = fork();
if (pid == 0) {
// child
signal(SIGINT, SIG_IGN);
signal(SIGTERM, SIG_IGN);
client.socket = client_fd;
client.enc = (i == 1);
return client_handler(&client, client_num, &client_addr);
} else if (pid > 0) {
// parent
client_num++;
close(client_fd);
for (int j = 0; j < MAX_CHILDREN; j++) {
if (children[j] == 0) {
children[j] = pid;
break;
}
}
} else {
fprintf(stderr, ERR_STR "Unable to create child process: %s" CLR_STR "\n", strerror(errno));
}
}
}
// TODO outsource in thread
int status = 0;
for (int i = 0; i < MAX_CHILDREN; i++) {
if (children[i] != 0) {
ret = waitpid(children[i], &status, WNOHANG);
if (ret < 0) {
fprintf(stderr, ERR_STR "Unable to wait for child process (PID %i): %s" CLR_STR "\n", children[i], strerror(errno));
} else if (ret == children[i]) {
children[i] = 0;
if (status != 0) {
fprintf(stderr, ERR_STR "Child process with PID %i terminated with exit code %i" CLR_STR "\n", ret, status);
}
}
}
}
}
config_unload();
cache_unload();
return 0;
}
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