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/*
* s_client command
*
* Copyright (C) 2019 Patrick McDermott
*
* This file is part of wolfssl-util.
*
* wolfssl-util is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* wolfssl-util 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with wolfssl-util. If not, see <http://www.gnu.org/licenses/>.
*/
#include <netdb.h>
#include <stdbool.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <sys/socket.h>
#include <wolfssl/ssl.h>
#include <wolfssl/wolfcrypt/settings.h>
#include "commands.h"
#define CA_CERTS "/etc/ssl/certs"
static _Bool
parse_host_port(char *hostport, char **host, char **port)
{
*host = hostport;
/* XXX: Port is required. Otherwise, this will mangle IPv6 addresses
* without some more intelligent (and larger) code. */
*port = strrchr(*host, ':');
if (!*port) {
fputs("Port is required\n", stderr);
return false;
}
**port = '\0';
++*port;
return true;
}
static _Bool
connect_socket(const char *host, const char *port)
{
struct addrinfo hints = {0};
struct addrinfo *result;
int s;
struct addrinfo *rp;
int sfd;
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
hints.ai_flags = AI_PASSIVE;
hints.ai_protocol = 0;
s = getaddrinfo(host, port, &hints, &result);
if (s != 0) {
fprintf(stderr, "Failed to resolve host and port: %s\n",
gai_strerror(s));
return -1;
}
for (rp = result; rp != NULL; rp = rp->ai_next) {
sfd = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol);
if (sfd == -1) {
continue;
}
if (connect(sfd, rp->ai_addr, rp->ai_addrlen) != -1) {
break;
}
close(sfd);
}
if (rp == NULL) {
fputs("Failed to connect\n", stderr);
freeaddrinfo(result);
return -1;
}
freeaddrinfo(result);
return sfd;
}
int
s_client(int argc, char **argv)
{
char *host = NULL;
char *port = NULL;
const char *servername = NULL;
int ret = EXIT_SUCCESS;
WOLFSSL_METHOD *method;
WOLFSSL_CTX *ctx;
WOLFSSL *ssl;
int sfd;
for (; argc > 0; --argc, ++argv) {
if (strcmp(*argv, "-quiet") == 0) {
/* No-op */
} else if (strcmp(*argv, "-connect") == 0) {
--argc, ++argv;
if (parse_host_port(*argv, &host, &port) == false) {
return EXIT_FAILURE;
}
} else if (strcmp(*argv, "-servername") == 0) {
--argc, ++argv;
servername = *argv;
} else if (**argv == '-') {
fprintf(stderr, "Unsupported option \"%s\"\n", *argv);
}
}
wolfSSL_Init();
method = wolfSSLv23_client_method();
if (method == NULL) {
fputs("Out of memory\n", stderr);
ret = EXIT_FAILURE;
goto cleanup;
}
ctx = wolfSSL_CTX_new(method);
if (ctx == NULL) {
fputs("Out of memory\n", stderr);
ret = EXIT_FAILURE;
goto cleanup;
}
if (wolfSSL_CTX_load_verify_locations_ex(ctx, NULL, CA_CERTS,
WOLFSSL_LOAD_FLAG_IGNORE_ERR) !=
WOLFSSL_SUCCESS) {
fputs("Failed to load CA certificates\n", stderr);
ret = EXIT_FAILURE;
goto ctx_free;
}
#ifdef HAVE_OCSP
if (wolfSSL_CTX_EnableOCSP(ctx, WOLFSSL_OCSP_CHECKALL) !=
WOLFSSL_SUCCESS) {
fputs("Failed to enable OCSP\n", stderr);
goto ctx_free;
}
#endif
#ifdef HAVE_SNI
if (servername != NULL) {
if (wolfSSL_CTX_UseSNI(ctx, WOLFSSL_SNI_HOST_NAME, servername,
strlen(servername)) != WOLFSSL_SUCCESS){
fputs("Out of memory\n", stderr);
ret = EXIT_FAILURE;
goto ctx_free;
}
}
#else
(void) servername;
#endif
ssl = wolfSSL_new(ctx);
if (ssl == NULL) {
fputs("Out of memory\n", stderr);
ret = EXIT_FAILURE;
goto ctx_free;
}
sfd = connect_socket(host, port);
if (sfd == -1) {
ret = EXIT_FAILURE;
goto ssl_free;
}
close(sfd);
ssl_free:
wolfSSL_free(ssl);
ctx_free:
wolfSSL_CTX_free(ctx);
cleanup:
wolfSSL_Cleanup();
return ret;
}
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