mongoose/examples/netcat/nc.c

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// Copyright (c) 2014 Cesanta Software Limited
// All rights reserved
//
// This software is dual-licensed: you can redistribute it and/or modify
// it under the terms of the GNU General Public License version 2 as
// published by the Free Software Foundation. For the terms of this
// license, see <http://www.gnu.org/licenses/>.
//
// You are free to use this software under the terms of the GNU General
// Public License, 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.
//
// Alternatively, you can license this software under a commercial
// license, as set out in <https://www.cesanta.com/license>.
//
// $Date: 2014-09-28 05:04:41 UTC $
// This file implements "netcat" utility with SSL and traffic hexdump.
#include "mongoose.h"
static sig_atomic_t s_received_signal = 0;
static void signal_handler(int sig_num) {
signal(sig_num, signal_handler);
s_received_signal = sig_num;
}
static void show_usage_and_exit(const char *prog_name) {
fprintf(stderr, "%s\n", "Copyright (c) 2014 CESANTA SOFTWARE");
fprintf(stderr, "%s\n", "Usage:");
fprintf(stderr, " %s\n [-d debug_file] [-l] [tcp|ssl]://[ip:]port[:cert][:ca_cert]",
prog_name);
fprintf(stderr, "%s\n", "Examples:");
fprintf(stderr, " %s\n -d hexdump.txt ssl://google.com:443", prog_name);
fprintf(stderr, " %s\n -l ssl://443:ssl_cert.pem", prog_name);
fprintf(stderr, " %s\n -l tcp://8080", prog_name);
exit(EXIT_FAILURE);
}
static void on_stdin_read(struct mg_connection *nc, int ev, void *p) {
int ch = * (int *) p;
(void) ev;
if (ch < 0) {
// EOF is received from stdin. Schedule the connection to close
nc->flags |= NSF_SEND_AND_CLOSE;
if (nc->send_mbuf.len <= 0) {
nc->flags |= NSF_CLOSE_IMMEDIATELY;
}
} else {
// A character is received from stdin. Send it to the connection.
unsigned char c = (unsigned char) ch;
mg_send(nc, &c, 1);
}
}
static void *stdio_thread_func(void *param) {
struct mg_mgr *mgr = (struct mg_mgr *) param;
int ch;
// Read stdin until EOF character by character, sending them to the mgr
while ((ch = getchar()) != EOF) {
mg_broadcast(mgr, on_stdin_read, &ch, sizeof(ch));
}
s_received_signal = 1;
return NULL;
}
static void ev_handler(struct mg_connection *nc, int ev, void *p) {
(void) p;
switch (ev) {
case NS_ACCEPT:
case NS_CONNECT:
mg_start_thread(stdio_thread_func, nc->mgr);
break;
case NS_CLOSE:
s_received_signal = 1;
break;
case NS_RECV:
fwrite(nc->recv_mbuf.buf, 1, nc->recv_mbuf.len, stdout);
mbuf_remove(&nc->recv_mbuf, nc->recv_mbuf.len);
break;
default:
break;
}
}
int main(int argc, char *argv[]) {
struct mg_mgr mgr;
int i, is_listening = 0;
const char *address = NULL;
mg_mgr_init(&mgr, NULL);
// Parse command line options
for (i = 1; i < argc && argv[i][0] == '-'; i++) {
if (strcmp(argv[i], "-l") == 0) {
is_listening = 1;
} else if (strcmp(argv[i], "-d") == 0 && i + 1 < argc) {
mgr.hexdump_file = argv[++i];
} else {
show_usage_and_exit(argv[0]);
}
}
if (i + 1 == argc) {
address = argv[i];
} else {
show_usage_and_exit(argv[0]);
}
signal(SIGTERM, signal_handler);
signal(SIGINT, signal_handler);
signal(SIGPIPE, SIG_IGN);
if (is_listening) {
if (mg_bind(&mgr, address, ev_handler) == NULL) {
fprintf(stderr, "mg_bind(%s) failed\n", address);
exit(EXIT_FAILURE);
}
} else if (mg_connect(&mgr, address, ev_handler) == NULL) {
fprintf(stderr, "mg_connect(%s) failed\n", address);
exit(EXIT_FAILURE);
}
while (s_received_signal == 0) {
mg_mgr_poll(&mgr, 1000);
}
mg_mgr_free(&mgr);
return EXIT_SUCCESS;
}