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/* SPDX-License-Identifier: GPL-3.0-or-later */
#include <stdio.h>
#include <getopt.h>
#include <stdlib.h>
#include <signal.h>
#include <errno.h>
#include <string.h>
#include <gnutls/gnutls.h>
#include "tls-proxy.h"
static char default_local_addr[] = "127.0.0.1";
static char default_upstream_addr[] = "127.0.0.1";
static char default_cert_path[] = "../certs/tt.cert.pem";
static char default_key_path[] = "../certs/tt.key.pem";
void help(char *argv[], struct args *a)
{
printf("Usage: %s [parameters] [rundir]\n", argv[0]);
printf("\nParameters:\n"
" -l, --local=[addr] Server address to bind to (default: %s).\n"
" -p, --lport=[port] Server port to bind to (default: %u).\n"
" -u, --upstream=[addr] Upstream address (default: %s).\n"
" -d, --uport=[port] Upstream port (default: %u).\n"
" -t, --cert=[path] Path to certificate file (default: %s).\n"
" -k, --key=[path] Path to key file (default: %s).\n"
" -c, --close=[N] Close connection to client after\n"
" every N ms (default: %li).\n"
" -f, --fail=[N] Delay every Nth incoming connection by 10 sec,\n"
" 0 disables delaying (default: 0).\n"
" -r, --rehandshake Do TLS rehandshake after every 8 bytes\n"
" sent to the client (default: no).\n"
" -a, --acceptonly Accept incoming connections, but don't\n"
" connect to upstream (default: no).\n"
" -v, --tls13 Force use of TLSv1.3. If not turned on,\n"
" TLSv1.2 will be used (default: no).\n"
,
a->local_addr, a->local_port,
a->upstream, a->upstream_port,
a->cert_file, a->key_file,
a->close_timeout);
}
void init_args(struct args *a)
{
a->local_addr = default_local_addr;
a->local_port = 54000;
a->upstream = default_upstream_addr;
a->upstream_port = 53000;
a->cert_file = default_cert_path;
a->key_file = default_key_path;
a->rehandshake = false;
a->accept_only = false;
a->tls_13 = false;
a->close_connection = false;
a->close_timeout = 1000;
a->max_conn_sequence = 0; /* disabled */
}
int main(int argc, char **argv)
{
long int li_value = 0;
int c = 0, li = 0;
struct option opts[] = {
{"local", required_argument, 0, 'l'},
{"lport", required_argument, 0, 'p'},
{"upstream", required_argument, 0, 'u'},
{"uport", required_argument, 0, 'd'},
{"cert", required_argument, 0, 't'},
{"key", required_argument, 0, 'k'},
{"close", required_argument, 0, 'c'},
{"fail", required_argument, 0, 'f'},
{"rehandshake", no_argument, 0, 'r'},
{"acceptonly", no_argument, 0, 'a'},
#if GNUTLS_VERSION_NUMBER >= 0x030604
{"tls13", no_argument, 0, 'v'},
#endif
{0, 0, 0, 0}
};
struct args args;
init_args(&args);
while ((c = getopt_long(argc, argv, "l:p:u:d:t:k:c:f:rav", opts, &li)) != -1) {
switch (c)
{
case 'l':
args.local_addr = optarg;
break;
case 'u':
args.upstream = optarg;
break;
case 't':
args.cert_file = optarg;
break;
case 'k':
args.key_file = optarg;
break;
case 'p':
li_value = strtol(optarg, NULL, 10);
if (li_value <= 0 || li_value > UINT16_MAX) {
printf("error: '-p' requires a positive"
" number less or equal to 65535, not '%s'\n", optarg);
return -1;
}
args.local_port = (uint16_t)li_value;
break;
case 'd':
li_value = strtol(optarg, NULL, 10);
if (li_value <= 0 || li_value > UINT16_MAX) {
printf("error: '-d' requires a positive"
" number less or equal to 65535, not '%s'\n", optarg);
return -1;
}
args.upstream_port = (uint16_t)li_value;
break;
case 'c':
li_value = strtol(optarg, NULL, 10);
if (li_value <= 0) {
printf("[system] error '-c' requires a positive"
" number, not '%s'\n", optarg);
return -1;
}
args.close_connection = true;
args.close_timeout = li_value;
break;
case 'f':
li_value = strtol(optarg, NULL, 10);
if (li_value <= 0 || li_value > UINT32_MAX) {
printf("error: '-f' requires a positive"
" number less or equal to %i, not '%s'\n",
UINT32_MAX, optarg);
return -1;
}
args.max_conn_sequence = (uint32_t)li_value;
break;
case 'r':
args.rehandshake = true;
break;
case 'a':
args.accept_only = true;
break;
case 'v':
#if GNUTLS_VERSION_NUMBER >= 0x030604
args.tls_13 = true;
#endif
break;
default:
init_args(&args);
help(argv, &args);
return -1;
}
}
if (signal(SIGPIPE, SIG_IGN) == SIG_ERR) {
fprintf(stderr, "failed to set up SIGPIPE handler to ignore(%s)\n",
strerror(errno));
}
struct tls_proxy_ctx *proxy = tls_proxy_allocate();
if (!proxy) {
fprintf(stderr, "can't allocate tls_proxy structure\n");
return 1;
}
int res = tls_proxy_init(proxy, &args);
if (res) {
fprintf(stderr, "can't initialize tls_proxy structure\n");
return res;
}
res = tls_proxy_start_listen(proxy);
if (res) {
fprintf(stderr, "error starting listen, error code: %i\n", res);
return res;
}
fprintf(stdout, "Listen on %s#%u\n"
"Upstream is expected on %s#%u\n"
"Certificate file %s\n"
"Key file %s\n"
"Rehandshake %s\n"
"Close %s\n"
"Refuse incoming connections every %ith%s\n"
"Only accept, don't forward %s\n"
"Force TLSv1.3 %s\n"
,
args.local_addr, args.local_port,
args.upstream, args.upstream_port,
args.cert_file, args.key_file,
args.rehandshake ? "yes" : "no",
args.close_connection ? "yes" : "no",
args.max_conn_sequence, args.max_conn_sequence ? "" : " (disabled)",
args.accept_only ? "yes" : "no",
#if GNUTLS_VERSION_NUMBER >= 0x030604
args.tls_13 ? "yes" : "no"
#else
"Not supported"
#endif
);
res = tls_proxy_run(proxy);
tls_proxy_free(proxy);
return res;
}
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