silcnet.c
- Author: Pekka Riikonen <priikone@poseidon.pspt.fi>
+ Author: Pekka Riikonen <priikone@silcnet.org>
- Copyright (C) 1997 - 2000 Pekka Riikonen
+ Copyright (C) 1997 - 2001 Pekka Riikonen
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
GNU General Public License for more details.
*/
-/*
- * $Id$
- * $Log$
- * Revision 1.1 2000/09/13 17:45:16 priikone
- * Splitted SILC core library. Core library includes now only
- * SILC protocol specific stuff. New utility library includes the
- * old stuff from core library that is more generic purpose stuff.
- *
- * Revision 1.3 2000/07/05 06:06:35 priikone
- * Global cosmetic change.
- *
- * Revision 1.2 2000/06/30 10:49:48 priikone
- * Added SOCKS4 and SOCKS5 support for SILC client.
- *
- * Revision 1.1.1.1 2000/06/27 11:36:55 priikone
- * Imported from internal CVS/Added Log headers.
- *
- *
- */
+/* $Id$ */
#include "silcincludes.h"
#include "silcnet.h"
-/* This function creates server or daemon or listener or what ever. This
- does not fork a new process, it must be done by the caller if caller
- wants to create a child process. This is used by the SILC server.
- If argument `ip_addr' is NULL `any' address will be used. Returns
- the created socket or -1 on error. */
-
-int silc_net_create_server(int port, char *ip_addr)
-{
- int sock, rval;
- struct sockaddr_in server;
-
- SILC_LOG_DEBUG(("Creating a new server listener"));
-
- /* Create the socket */
- sock = socket(PF_INET, SOCK_STREAM, 0);
- if (sock < 0) {
- SILC_LOG_ERROR(("Cannot create socket: %s", strerror(errno)));
- return -1;
- }
-
- /* Set the socket options */
- rval = silc_net_set_socket_opt(sock, SOL_SOCKET, SO_REUSEADDR, 1);
- if (rval < 0) {
- SILC_LOG_ERROR(("Cannot set socket options: %s", strerror(errno)));
- return -1;
- }
-
- /* Set the socket information for bind() */
- memset(&server, 0, sizeof(server));
- server.sin_family = PF_INET;
- server.sin_port = htons(port);
-
- /* Convert IP address to network byte order */
- if (ip_addr)
- inet_aton(ip_addr, &server.sin_addr);
- else
- server.sin_addr.s_addr = INADDR_ANY;
-
- /* Bind the server socket */
- rval = bind(sock, (struct sockaddr *)&server, sizeof(server));
- if (rval < 0) {
- SILC_LOG_ERROR(("Cannot bind socket: %s", strerror(errno)));
- return -1;
- }
-
- /* Specify that we are listenning */
- rval = listen(sock, 5);
- if (rval < 0) {
- SILC_LOG_ERROR(("Cannot set socket listenning: %s", strerror(errno)));
- return -1;
- }
-
- /* Set the server socket to non-blocking mode */
- silc_net_set_socket_nonblock(sock);
-
- SILC_LOG_DEBUG(("Server listener created, fd=%d", sock));
-
- return sock;
-}
-
-void silc_net_close_server(int sock)
-{
- shutdown(sock, 2);
- close(sock);
-
- SILC_LOG_DEBUG(("Server socket closed"));
-}
-
-/* Creates a connection (TCP/IP) to a remote host. Returns the connection
- socket or -1 on error. This blocks the process while trying to create
- the connection. */
-
-int silc_net_create_connection(int port, char *host)
-{
- int sock, rval;
- struct hostent *dest;
- struct sockaddr_in desthost;
-
- SILC_LOG_DEBUG(("Creating connection to host %s port %d", host, port));
-
- /* Do host lookup */
- dest = gethostbyname(host);
- if (!dest) {
- SILC_LOG_ERROR(("Network (%s) unreachable", host));
- return -1;
- }
-
- /* Set socket information */
- memset(&desthost, 0, sizeof(desthost));
- desthost.sin_port = htons(port);
- desthost.sin_family = PF_INET;
- memcpy(&desthost.sin_addr, dest->h_addr_list[0], sizeof(desthost.sin_addr));
-
- /* Create the connection socket */
- sock = socket(PF_INET, SOCK_STREAM, 0);
- if (sock < 0) {
- SILC_LOG_ERROR(("Cannot create socket: %s", strerror(errno)));
- return -1;
- }
-
- /* Connect to the host */
- rval = connect(sock, (struct sockaddr *)&desthost, sizeof(desthost));
- if (rval < 0) {
- SILC_LOG_ERROR(("Cannot connect to remote host: %s", strerror(errno)));
- shutdown(sock, 2);
- close(sock);
- return -1;
- }
-
- /* Set appropriate option */
- silc_net_set_socket_opt(sock, IPPROTO_TCP, TCP_NODELAY, 1);
-
- SILC_LOG_DEBUG(("Connection created"));
-
- return sock;
-}
-
-/* Creates a connection (TCP/IP) to a remote host. Returns the connection
- socket or -1 on error. This creates non-blocking socket hence the
- connection returns directly. To get the result of the connect() one
- must select() the socket and read the result after it's ready. */
-
-int silc_net_create_connection_async(int port, char *host)
-{
- int sock, rval;
- struct hostent *dest;
- struct sockaddr_in desthost;
-
- SILC_LOG_DEBUG(("Creating connection (async) to host %s port %d",
- host, port));
-
- /* Do host lookup */
- dest = gethostbyname(host);
- if (!dest) {
- SILC_LOG_ERROR(("Network (%s) unreachable", host));
- return -1;
- }
-
- /* Set socket information */
- memset(&desthost, 0, sizeof(desthost));
- desthost.sin_port = htons(port);
- desthost.sin_family = PF_INET;
- memcpy(&desthost.sin_addr, dest->h_addr_list[0], sizeof(desthost.sin_addr));
-
- /* Create the connection socket */
- sock = socket(PF_INET, SOCK_STREAM, 0);
- if (sock < 0) {
- SILC_LOG_ERROR(("Cannot create socket: %s", strerror(errno)));
- return -1;
- }
-
- /* Set the socket to non-blocking mode */
- silc_net_set_socket_nonblock(sock);
-
- /* Connect to the host */
- rval = connect(sock, (struct sockaddr *)&desthost, sizeof(desthost));
- if (rval < 0) {
- if (errno != EINPROGRESS) {
- SILC_LOG_ERROR(("Cannot connect to remote host: %s", strerror(errno)));
- shutdown(sock, 2);
- close(sock);
- return -1;
- }
- }
-
- /* Set appropriate option */
- silc_net_set_socket_opt(sock, IPPROTO_TCP, TCP_NODELAY, 1);
-
- SILC_LOG_DEBUG(("Connection operation in progress"));
-
- return sock;
-}
-
-/* Closes the connection */
-
-void silc_net_close_connection(int sock)
-{
- close(sock);
-}
-
/* Accepts a connection from a particular socket */
int silc_net_accept_connection(int sock)
return accept(sock, 0, 0);
}
-/* Set's the socket to non-blocking mode. */
+/* Sets a option for a socket. */
-int silc_net_set_socket_nonblock(int sock)
+int silc_net_set_socket_opt(int sock, int level, int option, int on)
{
- return fcntl(sock, F_SETFL, fcntl(sock, F_GETFL, 0) | O_NONBLOCK);
+ return setsockopt(sock, level, option, (void *)&on, sizeof(on));
}
-/* Sets a option for a socket. */
+/* Get socket options */
-int silc_net_set_socket_opt(int sock, int level, int option, int on)
+int silc_net_get_socket_opt(int sock, int level, int option,
+ void *optval, int *opt_len)
{
- return setsockopt(sock, level, option, (void *)&on, sizeof(on));
+ return getsockopt(sock, level, option, optval, opt_len);
}
/* Checks whether IP address sent as argument is valid IP address. */
-int silc_net_is_ip(const char *addr)
+bool silc_net_is_ip(const char *addr)
{
struct in_addr tmp;
- return inet_aton(addr, &tmp);
+ int len = sizeof(tmp);
+ return silc_net_addr2bin(addr, (unsigned char *)&tmp.s_addr, len);
}
-/* Performs lookups for remote name and IP address. */
+/* Performs lookups for remote name and IP address. This peforms reverse
+ lookup as well to verify that the IP has FQDN. */
-void silc_net_check_host_by_sock(int sock, char **hostname, char **ip)
+bool silc_net_check_host_by_sock(int sock, char **hostname, char **ip)
{
struct sockaddr_in remote;
struct hostent *dest;
len = sizeof(remote);
rval = getpeername(sock, (struct sockaddr *)&remote, &len);
if (rval < 0)
- return;
+ return FALSE;
+
+ host_ip = inet_ntoa(remote.sin_addr);
+ if (!host_ip)
+ return FALSE;
+
+ *ip = silc_calloc(strlen(host_ip) + 1, sizeof(char));
+ memcpy(*ip, host_ip, strlen(host_ip));
/* Get host by address */
dest = gethostbyaddr((char *)&remote.sin_addr,
sizeof(struct in_addr), AF_INET);
if (!dest)
- return;
+ return FALSE;
- /* Get same hsot by name to see that the remote host really is
+ /* Get same host by name to see that the remote host really is
the who it says it is */
memset(host_name, 0, sizeof(host_name));
memcpy(host_name, dest->h_name, strlen(dest->h_name));
+
+ *hostname = silc_calloc(strlen(host_name) + 1, sizeof(char));
+ memcpy(*hostname, host_name, strlen(host_name));
+ SILC_LOG_DEBUG(("Resolved hostname `%s'", *hostname));
+
dest = gethostbyname(host_name);
if (!dest)
- return;
+ return FALSE;
/* Find the address from list */
for (i = 0; dest->h_addr_list[i]; i++)
if (!memcmp(dest->h_addr_list[i], &remote.sin_addr,
- sizeof(struct in_addr)))
+ sizeof(struct in_addr)))
break;
if (!dest->h_addr_list[i])
- return;
+ return FALSE;
- host_ip = inet_ntoa(remote.sin_addr);
+ silc_free(*ip);
+ *ip = silc_calloc(strlen(host_ip) + 1, sizeof(char));
+ memcpy(*ip, host_ip, strlen(host_ip));
+ SILC_LOG_DEBUG(("Resolved IP address `%s'", *ip));
+
+ return TRUE;
+}
+
+/* Performs lookups for local name and IP address. This peforms reverse
+ lookup as well to verify that the IP has FQDN. */
+
+bool silc_net_check_local_by_sock(int sock, char **hostname, char **ip)
+{
+ struct sockaddr_in local;
+ struct hostent *dest;
+ char *host_ip = NULL;
+ char host_name[1024];
+ int rval, len;
+ int i;
+
+ *hostname = NULL;
+ *ip = NULL;
+
+ SILC_LOG_DEBUG(("Resolving local hostname and IP address"));
+
+ memset(&local, 0, sizeof(local));
+ len = sizeof(local);
+ rval = getsockname(sock, (struct sockaddr *)&local, &len);
+ if (rval < 0)
+ return FALSE;
+
+ host_ip = inet_ntoa(local.sin_addr);
if (!host_ip)
- return;
+ return FALSE;
+
+ *ip = silc_calloc(strlen(host_ip) + 1, sizeof(char));
+ memcpy(*ip, host_ip, strlen(host_ip));
+
+ /* Get host by address */
+ dest = gethostbyaddr((char *)&local.sin_addr,
+ sizeof(struct in_addr), AF_INET);
+ if (!dest)
+ return FALSE;
+
+ /* Get same host by name to see that the local host really is
+ the who it says it is */
+ memset(host_name, 0, sizeof(host_name));
+ memcpy(host_name, dest->h_name, strlen(dest->h_name));
*hostname = silc_calloc(strlen(host_name) + 1, sizeof(char));
memcpy(*hostname, host_name, strlen(host_name));
SILC_LOG_DEBUG(("Resolved hostname `%s'", *hostname));
+
+ dest = gethostbyname(host_name);
+ if (!dest)
+ return FALSE;
+
+ /* Find the address from list */
+ for (i = 0; dest->h_addr_list[i]; i++)
+ if (!memcmp(dest->h_addr_list[i], &local.sin_addr,
+ sizeof(struct in_addr)))
+ break;
+ if (!dest->h_addr_list[i])
+ return FALSE;
+
+ silc_free(*ip);
*ip = silc_calloc(strlen(host_ip) + 1, sizeof(char));
memcpy(*ip, host_ip, strlen(host_ip));
SILC_LOG_DEBUG(("Resolved IP address `%s'", *ip));
+
+ return TRUE;
+}
+
+/* Return remote port by socket. */
+
+uint16 silc_net_get_remote_port(int sock)
+{
+ struct sockaddr_in remote;
+ int len;
+
+ memset(&remote, 0, sizeof(remote));
+ len = sizeof(remote);
+ if (getpeername(sock, (struct sockaddr *)&remote, &len) < 0)
+ return 0;
+
+ return ntohs(remote.sin_port);
+}
+
+/* Return local port by socket. */
+
+uint16 silc_net_get_local_port(int sock)
+{
+ struct sockaddr_in local;
+ int len;
+
+ memset(&local, 0, sizeof(local));
+ len = sizeof(local);
+ if (getsockname(sock, (struct sockaddr *)&local, &len) < 0)
+ return 0;
+
+ return ntohs(local.sin_port);
+}
+
+/* Return name of localhost. */
+
+char *silc_net_localhost(void)
+{
+ char hostname[256];
+ struct hostent *dest;
+
+ if (gethostname(hostname, sizeof(hostname)))
+ return NULL;
+
+ dest = gethostbyname(hostname);
+ if (!dest)
+ return strdup(hostname);
+
+ return strdup(dest->h_name);
+}
+
+/* Returns local IP address */
+
+char *silc_net_localip(void)
+{
+ char hostname[256];
+ struct hostent *dest;
+ struct in_addr ip;
+ char *ips;
+
+ if (gethostname(hostname, sizeof(hostname)))
+ return NULL;
+
+ dest = gethostbyname(hostname);
+ if (!dest)
+ return NULL;
+
+ SILC_GET32_LSB(ip.s_addr, dest->h_addr_list[0]);
+ ips = inet_ntoa(ip);
+
+ return strdup(ips);
}
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