From 836766d4c5bc47682ab69c57337157c879517670 Mon Sep 17 00:00:00 2001 From: Ivo Timmermans Date: Fri, 16 Nov 2001 17:38:39 +0000 Subject: [PATCH] First part of rewriting things to use struct addrinfo. --- src/net.c | 269 +++++++++++++++++++++++++++++++++++++----------------- 1 file changed, 185 insertions(+), 84 deletions(-) diff --git a/src/net.c b/src/net.c index 0397ba58..8406a79a 100644 --- a/src/net.c +++ b/src/net.c @@ -17,7 +17,7 @@ along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. - $Id: net.c,v 1.35.4.149 2001/11/16 12:22:02 zarq Exp $ + $Id: net.c,v 1.35.4.150 2001/11/16 17:38:39 zarq Exp $ */ #include "config.h" @@ -85,6 +85,38 @@ int do_prune = 0; /* VPN packet I/O */ +char *hostlookup(struct sockaddr *addr, int numericonly) +{ + char *name; + struct hostent *host = NULL; + struct in_addr in; + config_t const *cfg; + int flags = 0; + +cp + if(numericonly + || ((cfg = get_config_val(config, resolve_dns)) == NULL + || cfg->data.val != stupid_true)) + flags |= NI_NUMERICHOST; + + hostname = xmalloc(NI_MAXHOST); + + if((r = getnameinfo(addr, sizeof(*addr), &hostname, NI_MAXHOST, NULL, 0, flags)) != 0) + { + free(hostname); + if(flags & NI_NUMERICHOST) + { + syslog(LOG_ERR, _("Address conversion failed: %s"), + gai_strerror(r)); + return NULL; + } + else + return hostlookup(addr, 1); + } +cp + return hostname; +} + void receive_udppacket(node_t *n, vpn_packet_t *inpkt) { vpn_packet_t outpkt; @@ -160,12 +192,8 @@ cp EVP_EncryptUpdate(&ctx, outpkt.salt, &outlen, inpkt->salt, inpkt->len + sizeof(inpkt->salt)); EVP_EncryptFinal(&ctx, outpkt.salt + outlen, &outpad); outlen += outpad; - - to.sin_family = AF_INET; - to.sin_addr.s_addr = htonl(n->address); - to.sin_port = htons(n->port); - - if((sendto(udp_socket, (char *) outpkt.salt, outlen, 0, (const struct sockaddr *)&to, tolen)) < 0) + + if((sendto(udp_socket, (char *) outpkt.salt, outlen, 0, n->address->ai_addr, n->address->ai_addrlen)) < 0) { syslog(LOG_ERR, _("Error sending packet to %s (%s): %m"), n->name, n->hostname); @@ -245,118 +273,191 @@ cp /* Setup sockets */ -int setup_listen_socket(int port) +int setup_listen_socket(node_t *n) { int nfd, flags; - struct sockaddr_in a; int option; char *address; - ip_mask_t *ipmask; + int r; + struct addrinfo hints, *ai, *aitop; + int ipv6preferred; #ifdef HAVE_LINUX char *interface; #endif + cp - if((nfd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0) + + if(!get_config_string(lookup_config(config_tree, "BindToAddress"), &address)) { - syslog(LOG_ERR, _("Creating metasocket failed: %m")); - return -1; + address = NULL; } - flags = fcntl(nfd, F_GETFL); - if(fcntl(nfd, F_SETFL, flags | O_NONBLOCK) < 0) + hints.ai_socktype = SOCK_STREAM; + hints.ai_protocol = IPPROTO_TCP; + hints.ai_family = AF_INET; + if(get_config_bool(lookup_config(config_tree, "IPv6Preferred"), &ipv6preferred)) { - close(nfd); - syslog(LOG_ERR, _("System call `%s' failed: %m"), - "fcntl"); + if(ipv6preferred) + hints.ai_family = PF_UNSPEC; + } + if((r = getaddrinfo(address, n->port, &hints, &aitop)) != 0) + { + syslog(LOG_ERR, _("Looking up `%s' failed: %s\n"), + address, gai_strerror(r)); return -1; } - /* Optimize TCP settings */ - - option = 1; - setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, &option, sizeof(option)); - setsockopt(nfd, SOL_SOCKET, SO_KEEPALIVE, &option, sizeof(option)); + /* Try to create a listening socket for all alternatives we got from + getaddrinfo. */ + for(ai = aitop; ai != NULL; ai = ai->ai_next) + { + if((nfd = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol)) < 0) + { + syslog(LOG_ERR, _("Creating metasocket failed: %m")); + continue; + } + + flags = fcntl(nfd, F_GETFL); + if(fcntl(nfd, F_SETFL, flags | O_NONBLOCK) < 0) + { + close(nfd); + syslog(LOG_ERR, _("System call `%s' failed: %m"), + "fcntl"); + continue; + } + + /* Optimize TCP settings */ + + option = 1; + setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, &option, sizeof(option)); + setsockopt(nfd, SOL_SOCKET, SO_KEEPALIVE, &option, sizeof(option)); #ifdef HAVE_LINUX - setsockopt(nfd, SOL_TCP, TCP_NODELAY, &option, sizeof(option)); - - option = IPTOS_LOWDELAY; - setsockopt(nfd, SOL_IP, IP_TOS, &option, sizeof(option)); - - if(get_config_string(lookup_config(config_tree, "BindToInterface"), &interface)) - if(setsockopt(nfd, SOL_SOCKET, SO_BINDTODEVICE, interface, strlen(interface))) - { - close(nfd); - syslog(LOG_ERR, _("Can't bind to interface %s: %m"), interface); - return -1; - } + setsockopt(nfd, SOL_TCP, TCP_NODELAY, &option, sizeof(option)); + + option = IPTOS_LOWDELAY; + setsockopt(nfd, SOL_IP, IP_TOS, &option, sizeof(option)); + + if(get_config_string(lookup_config(config_tree, "BindToInterface"), &interface)) + if(setsockopt(nfd, SOL_SOCKET, SO_BINDTODEVICE, interface, strlen(interface))) + { + close(nfd); + syslog(LOG_ERR, _("Can't bind to interface %s: %m"), interface); + continue; + } #endif - memset(&a, 0, sizeof(a)); - a.sin_family = AF_INET; - a.sin_addr.s_addr = htonl(INADDR_ANY); - a.sin_port = htons(port); - - if(get_config_string(lookup_config(config_tree, "BindToAddress"), &address)) - { - ipmask = strtoip(address); - if(ipmask) - { - a.sin_addr.s_addr = htonl(ipmask->address); - free(ipmask); - } - } + if(bind(nfd, ai->ai_addr, ai->ai_addrlen)) + { + close(nfd); + syslog(LOG_ERR, _("Can't bind to %s port %d/tcp: %m"), + ai->ai_canonname, n->port); + continue; + } + + if(listen(nfd, 3)) + { + close(nfd); + syslog(LOG_ERR, _("System call `%s' failed: %m"), + "listen"); + continue; + } - if(bind(nfd, (struct sockaddr *)&a, sizeof(struct sockaddr))) - { - close(nfd); - syslog(LOG_ERR, _("Can't bind to port %hd/tcp: %m"), port); - return -1; + break; /* We have successfully bound to a socket */ } - if(listen(nfd, 3)) + if(ai == NULL) /* None of the alternatives succeeded */ { - close(nfd); - syslog(LOG_ERR, _("System call `%s' failed: %m"), - "listen"); + syslog(LOG_ERR, _("Failed to open a listening socket.")); return -1; } cp return nfd; } -int setup_vpn_in_socket(int port) +int setup_vpn_in_socket(node_t *n) { - int nfd, flags; - struct sockaddr_in a; const int one = 1; + int nfd, flags; + int option; + char *address; + int r; + struct addrinfo hints, *ai, *aitop; + int ipv6preferred; +#ifdef HAVE_LINUX + char *interface; +#endif + cp - if((nfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) + + if(!get_config_string(lookup_config(config_tree, "BindToAddress"), &address)) { - close(nfd); - syslog(LOG_ERR, _("Creating socket failed: %m")); + address = NULL; + } + + hints.ai_socktype = SOCK_DGRAM; + hints.ai_protocol = IPPROTO_UDP; + hints.ai_family = AF_INET; + if(get_config_bool(lookup_config(config_tree, "IPv6Preferred"), &ipv6preferred)) + { + if(ipv6preferred) + hints.ai_family = PF_UNSPEC; + } + if((r = getaddrinfo(address, n->port, &hints, &aitop)) != 0) + { + syslog(LOG_ERR, _("Looking up `%s' failed: %s\n"), + address, gai_strerror(r)); return -1; } setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one)); - flags = fcntl(nfd, F_GETFL); - if(fcntl(nfd, F_SETFL, flags | O_NONBLOCK) < 0) + /* Try to create a listening socket for all alternatives we got from + getaddrinfo. */ + for(ai = aitop; ai != NULL; ai = ai->ai_next) { - close(nfd); - syslog(LOG_ERR, _("System call `%s' failed: %m"), - "fcntl"); - return -1; - } + if((nfd = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol)) < 0) + { + syslog(LOG_ERR, _("Creating metasocket failed: %m")); + continue; + } + + flags = fcntl(nfd, F_GETFL); + if(fcntl(nfd, F_SETFL, flags | O_NONBLOCK) < 0) + { + close(nfd); + syslog(LOG_ERR, _("System call `%s' failed: %m"), + "fcntl"); + continue; + } + + /* Optimize UDP settings */ + + option = 1; + setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, &option, sizeof(option)); +#ifdef HAVE_LINUX + if(get_config_string(lookup_config(config_tree, "BindToInterface"), &interface)) + if(setsockopt(nfd, SOL_SOCKET, SO_BINDTODEVICE, interface, strlen(interface))) + { + close(nfd); + syslog(LOG_ERR, _("Can't bind to interface %s: %m"), interface); + continue; + } +#endif - memset(&a, 0, sizeof(a)); - a.sin_family = AF_INET; - a.sin_port = htons(port); - a.sin_addr.s_addr = htonl(INADDR_ANY); + if(bind(nfd, ai->ai_addr, ai->ai_addrlen)) + { + close(nfd); + syslog(LOG_ERR, _("Can't bind to %s port %d/tcp: %m"), + ai->ai_canonname, n->port); + continue; + } + + break; /* We have successfully bound to a socket */ + } - if(bind(nfd, (struct sockaddr *)&a, sizeof(struct sockaddr))) + if(ai == NULL) /* None of the alternatives succeeded */ { - close(nfd); - syslog(LOG_ERR, _("Can't bind to port %hd/udp: %m"), port); + syslog(LOG_ERR, _("Failed to open a listening socket.")); return -1; } cp @@ -668,8 +769,8 @@ cp return -1; } */ - if(!get_config_port(lookup_config(myself->connection->config_tree, "Port"), &myself->port)) - myself->port = 655; + if(!get_config_string(lookup_config(myself->connection->config_tree, "Port"), &myself->port)) + myself->port = "655"; myself->connection->port = myself->port; @@ -729,13 +830,13 @@ cp cp /* Open sockets */ - if((tcp_socket = setup_listen_socket(myself->port)) < 0) + if((tcp_socket = setup_listen_socket(myself)) < 0) { syslog(LOG_ERR, _("Unable to set up a listening TCP socket!")); return -1; } - if((udp_socket = setup_vpn_in_socket(myself->port)) < 0) + if((udp_socket = setup_vpn_in_socket(myself)) < 0) { syslog(LOG_ERR, _("Unable to set up a listening UDP socket!")); return -1; @@ -856,9 +957,9 @@ cp return NULL; } - c->address = ntohl(ci.sin_addr.s_addr); + asprintf(&(c->address), " = ntohl(ci.sin_addr.s_addr); c->hostname = hostlookup(ci.sin_addr.s_addr); - c->port = htons(ci.sin_port); + asprintf(&(c->port), "%d", htons(ci.sin_port)); c->socket = sfd; c->last_ping_time = time(NULL); -- 2.39.5