diff options
Diffstat (limited to 'server.c')
| -rw-r--r-- | server.c | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/server.c b/server.c new file mode 100644 index 0000000..b86d769 --- /dev/null +++ b/server.c @@ -0,0 +1,71 @@ +/* Copyright (C) 2019 C. McEnroe <june@causal.agency> + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU Affero General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU Affero General Public License for more details. + * + * You should have received a copy of the GNU Affero General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#include <err.h> +#include <netdb.h> +#include <netinet/in.h> +#include <stdlib.h> +#include <sys/socket.h> +#include <sysexits.h> +#include <tls.h> +#include <unistd.h> + +#include "bounce.h" + +static struct tls *client; + +int serverConnect(const char *host, const char *port) { + int error; + + struct tls_config *config = tls_config_new(); + error = tls_config_set_ciphers(config, "compat"); + if (error) errx(EX_SOFTWARE, "tls_config"); + + client = tls_client(); + if (!client) errx(EX_SOFTWARE, "tls_client"); + + error = tls_configure(client, config); + if (error) errx(EX_SOFTWARE, "tls_configure: %s", tls_error(client)); + tls_config_free(config); + + struct addrinfo *head; + struct addrinfo hints = { + .ai_family = AF_UNSPEC, + .ai_socktype = SOCK_STREAM, + .ai_protocol = IPPROTO_TCP, + }; + error = getaddrinfo(host, port, &hints, &head); + if (error) errx(EX_NOHOST, "%s:%s: %s", host, port, gai_strerror(error)); + + int sock = -1; + for (struct addrinfo *ai = head; ai; ai = ai->ai_next) { + sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); + if (sock < 0) err(EX_OSERR, "socket"); + + error = connect(sock, ai->ai_addr, ai->ai_addrlen); + if (!error) break; + + close(sock); + sock = -1; + } + if (sock < 0) err(EX_UNAVAILABLE, "%s:%s", host, port); + freeaddrinfo(head); + + error = tls_connect_socket(client, sock, host); + if (error) errx(EX_PROTOCOL, "tls_connect: %s", tls_error(client)); + + return sock; +} |