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#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <netdb.h>
#include <errno.h>
#include <canl.h>
#include <canl_ssl.h>
#define BUF_LEN 1000
#define BACKLOG 10
#define DEF_PORT 4321
#define DEF_TIMEOUT 150
int main(int argc, char *argv[])
{
canl_ctx my_ctx;
canl_io_handler my_io_h = NULL;
int err = 0;
int opt, port = DEF_PORT;
char *serv_cert = NULL;
char *serv_key = NULL;
char *ca_dir = NULL;
char buf[BUF_LEN];
int buf_len = 0;
struct timeval timeout;
canl_principal princ = NULL;
int get_peer_princ = 0;
int ocsp_on = 0;
char *name = NULL;
timeout.tv_sec = DEF_TIMEOUT;
timeout.tv_usec = 0;
while ((opt = getopt(argc, argv, "nhop:c:k:d:t:")) != -1) {
switch (opt) {
case 'h':
fprintf(stderr, "Usage: %s [-p port] [-c certificate]"
" [-k private key] [-d ca_dir] [-h] "
"[-t timeout] [-n {print peer's princ name}] "
" [-o {turn OCSP on}] "
" \n", argv[0]);
exit(0);
case 'p':
port = atoi(optarg);
break;
case 'c':
serv_cert = optarg;
break;
case 'k':
serv_key = optarg;
break;
case 'd':
ca_dir = optarg;
break;
case 't':
timeout.tv_sec = atoi(optarg);
break;
case 'n':
get_peer_princ = 1;
break;
case 'o':
ocsp_on = 1;
break;
default: /* '?' */
fprintf(stderr, "Usage: %s [-p port] [-c certificate]"
" [-k private key] [-d ca_dir] [-h] "
"[-t timeout] [-n {print peer's princ name}] "
" [-o {turn OCSP on}] "
" \n", argv[0]);
exit(-1);
}
}
my_ctx = canl_create_ctx();
if (!my_ctx){
printf("[SERVER] canl context cannot be created\n");
return -1;
}
err = canl_create_io_handler(my_ctx, &my_io_h);
if (err) {
printf("[SERVER] io handler cannot be created:\n[CANL] %s\n",
canl_get_error_message(my_ctx));
goto end;
}
if (serv_cert || serv_key){
err = canl_ctx_set_ssl_cred(my_ctx, serv_cert, serv_key, NULL,
NULL, NULL);
if (err) {
printf("[SERVER] cannot set certificate or key to"
" context:\n[CANL] %s\n",
canl_get_error_message(my_ctx));
goto end;
}
}
/* ACCEPT from canl_io_accept*/
int sockfd = 0, new_fd = 0;
char str_port[8];
struct addrinfo hints, *servinfo, *p;
struct sockaddr s_addr;
socklen_t sin_size;
int yes=1;
memset(&hints, 0, sizeof hints);
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
hints.ai_flags = AI_PASSIVE; // use my IP
if (snprintf(str_port, 8, "%d", port) < 0) {
printf ("[SERVER] Wrong port request");
return 1;
}
/* XXX timeouts - use c-ares, too */
if ((err = getaddrinfo(NULL, str_port, &hints, &servinfo)) != 0) {
printf("[SERVER] getaddrinfo: %s\n", gai_strerror(err));
return 1;
}
for (p = servinfo; p != NULL; p = p->ai_next) {
if ((sockfd = socket(p->ai_family, p->ai_socktype,
p->ai_protocol)) == -1) {
err = errno;
continue;
}
if (setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &yes,
sizeof(int)) == -1) {
err = errno;
continue;
}
if ((err = bind(sockfd, p->ai_addr, p->ai_addrlen))) {
err = errno;
close(sockfd);
continue;
}
if ((err = listen(sockfd, BACKLOG))) {
close(sockfd);
err = errno;
continue;
}
break;
}
freeaddrinfo(servinfo); // all done with this structure
if (p == NULL) {
/* Beware that only the last error is displayed here ... */
printf("Failed to acquire a server socket: %s\n",
strerror(err));
return 1;
}
printf("server: waiting for connections...\n");
sin_size = sizeof(s_addr);
if (ocsp_on)
canl_ctx_set_ssl_flags(my_ctx, CANL_SSL_OCSP_VERIFY_ALL);
new_fd = accept(sockfd, &s_addr, &sin_size);
if (new_fd == -1){
printf("Failed to accept network connection: %s", strerror(errno));
}
/* canl_create_io_handler has to be called for my_io_h*/
/* TODO timeout in this function? and select around it*/
if (get_peer_princ) {
err = canl_io_accept(my_ctx, my_io_h, new_fd, s_addr,
0, &princ, &timeout);
if (err) {
printf("[SERVER] connection cannot be established:\n[CANL] %s\n",
canl_get_error_message(my_ctx));
goto end;
}
err = canl_princ_name(my_ctx, princ, &name);
printf("[SERVER] connection established with %s\n", name);
free(name);
canl_princ_free(my_ctx, princ);
}
else{
err = canl_io_accept(my_ctx, my_io_h, new_fd, s_addr,
0, NULL, &timeout);
if (err) {
printf("[SERVER] connection cannot be established:\n[CANL] %s\n",
canl_get_error_message(my_ctx));
goto end;
}
printf("[SERVER] connection established\n");
}
strncpy(buf, "This is a testing message to send", sizeof(buf));
buf_len = strlen(buf) + 1;
printf("[SERVER] Trying to send sth to the client\n");
err = canl_io_write (my_ctx, my_io_h, buf, buf_len, &timeout);
if (err <= 0) {
printf("[SERVER] cannot send message to the client:\n[CANL] %s\n",
canl_get_error_message(my_ctx));
goto end;
}
else {
buf[err] = '\0';
printf("[SERVER] message \"%s\" sent successfully\n", buf);
}
buf[0] = '\0';
err = canl_io_read (my_ctx, my_io_h, buf, sizeof(buf)-1, &timeout);
if (err <= 0) {
printf("[SERVER] Failed to receive reply from client:\n[CANL] %s\n",
canl_get_error_message(my_ctx));
goto end;
}
buf[err] = '\0';
printf ("[SERVER] received: %s\n", buf);
err = 0;
end:
if (my_io_h)
canl_io_destroy(my_ctx, my_io_h);
canl_free_ctx(my_ctx);
return err;
}
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