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ssocket.c
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ssocket.c
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//
// ssocket.c
//
// Created by Jerome Poichet on 3/16/10.
// Copyright 2010 Jerome Poichet. All rights reserved.
//
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <netinet/in.h>
#include <netdb.h>
#include <unistd.h>
#include <openssl/ssl.h>
#include <openssl/err.h>
#include "ssocket.h"
#define BUFFER_SIZE 1024
int ssocket_connect(ssocket *sock);
// I/O
int ssocket_write(ssocket *sock, const char *buffer);
int ssocket_read(ssocket *sock, char **buffer, int len);
ssocket *ssocket_create(const char *hostname, unsigned short port, unsigned short ssl)
{
ssocket *sock = NULL;
sock = (ssocket *)malloc(sizeof(ssocket));
memset(sock, 0, sizeof(ssocket));
sock->hostname = strdup(hostname);
sock->port = port;
sock->doSSL = ssl;
sock->verbose = 0;
sock->connect = ssocket_connect;
sock->write = ssocket_write;
sock->read = ssocket_read;
return sock;
}
void ssocket_destroy(ssocket **sock)
{
if ((*sock)->doSSL) {
SSL_shutdown((*sock)->ssl);
SSL_free((*sock)->ssl);
SSL_CTX_free((*sock)->ctx);
}
close((*sock)->sd);
free((*sock)->hostname);
free(*sock);
}
int ssocket_connect(ssocket *sock)
{
struct hostent *hp;
struct sockaddr_in pin;
if ((hp = gethostbyname(sock->hostname)) == 0) {
fprintf(stderr, "Failed to retrieve hostname\n");
return -1;
}
memset(&pin, 0, sizeof(pin));
pin.sin_family = AF_INET;
pin.sin_addr.s_addr = ((struct in_addr *)(hp->h_addr))->s_addr;
pin.sin_port = htons(sock->port);
if ((sock->sd = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
fprintf(stderr, "Failed to create socket\n");
return -1;
}
if (connect(sock->sd, (struct sockaddr *)&pin, sizeof(pin)) == -1) {
fprintf(stderr, "Failed to connect\n");
return -1;
}
sock->sdf = fdopen(sock->sd, "r");
if (sock->verbose) fprintf(stderr, "Connected to %s:%d\n", sock->hostname, sock->port);
// TODO if SSL, do SSL negotiation here
if (sock->doSSL) {
if (sock->verbose) fprintf(stderr, "SSL Enabled\n");
SSL_library_init();
SSL_load_error_strings();
sock->ctx = SSL_CTX_new(SSLv23_client_method());
sock->ssl = SSL_new(sock->ctx);
if (sock->ssl == NULL) {
long err = ERR_get_error();
fprintf(stderr, "Error preparing SSL context: %s\n", ERR_error_string(err, NULL));
}
SSL_set_fd(sock->ssl, sock->sd);
if (SSL_connect(sock->ssl) <= 0) {
long err = ERR_get_error();
fprintf(stderr, "SSL Connect error: %s\n", ERR_error_string(err, NULL));
return -1;
}
if (sock->verbose) fprintf(stderr, "SSL Connected\n");
}
return 0;
}
int ssocket_write(ssocket *sock, const char *buffer)
{
int len = 0;
if (!sock) return -1;
if (!sock->sd) return -1;
if (sock->verbose) fprintf(stderr, "-> %s", buffer);
if (sock->doSSL) {
if ((len = SSL_write(sock->ssl, buffer, strlen(buffer))) <= 0) {
fprintf(stderr, "Failed to send message\n");
return -1;
}
} else {
if ((len = send(sock->sd, buffer, strlen(buffer), 0)) == -1) {
fprintf(stderr, "Failed to send message\n");
return -1;
}
}
return len;
}
int ssocket_read(ssocket *sock, char **buffer, int len)
{
int cnt;
if (!sock) return -1;
if (!sock->sd) return -1;
if (sock->doSSL) {
if ((cnt = SSL_read(sock->ssl, *buffer, len)) <= 0) {
fprintf(stderr, "Failed to read from socket (SSL)\n");
return -1;
} else {
(*buffer)[cnt] = '\0';
if (sock->verbose) fprintf(stderr, "<- (%ld) %s", strlen(*buffer), *buffer);
return cnt;
}
} else {
if ((cnt = recv(sock->sd, *buffer, len, 0)) <= 0) {
fprintf(stderr, "Failed to read from socket\n");
return -1;
}
if (sock->verbose) fprintf(stderr, "<- (%ld) %s", strlen(*buffer), *buffer);
return cnt;
}
}