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/*
* This file is Copyright (c) 2010 by the GPSD project
* BSD terms apply: see the file COPYING in the distribution root for details.
*/
#include <string.h>
#include <fcntl.h>
#ifndef S_SPLINT_S
#include <netdb.h>
#ifndef AF_UNSPEC
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/socket.h>
#endif /* AF_UNSPEC */
#include <sys/un.h>
#ifndef INADDR_ANY
#include <netinet/in.h>
#endif /* INADDR_ANY */
#include <arpa/inet.h> /* for htons() and friends */
#include <unistd.h>
#include <netinet/ip.h>
#endif /* S_SPLINT_S */
#include "gpsd.h"
#include "sockaddr.h"
/*@-mustfreefresh -usedef@*/
socket_t netlib_connectsock(int af, const char *host, const char *service,
const char *protocol)
{
struct protoent *ppe;
struct addrinfo hints;
struct addrinfo *result, *rp;
int ret, type, proto, one = 1;
socket_t s;
bool bind_me;
INVALIDATE_SOCKET(s);
/*@-type@*/
ppe = getprotobyname(protocol);
if (strcmp(protocol, "udp") == 0) {
type = SOCK_DGRAM;
proto = (ppe) ? ppe->p_proto : IPPROTO_UDP;
} else {
type = SOCK_STREAM;
proto = (ppe) ? ppe->p_proto : IPPROTO_TCP;
}
/*@+type@*/
/* we probably ought to pass this in as an explicit flag argument */
bind_me = (type == SOCK_DGRAM);
memset(&hints, 0, sizeof(struct addrinfo));
hints.ai_family = af;
hints.ai_socktype = type;
hints.ai_protocol = proto;
#ifndef S_SPLINT_S
if (bind_me)
hints.ai_flags = AI_PASSIVE;
if ((ret = getaddrinfo(host, service, &hints, &result))) {
return NL_NOHOST;
}
#endif /* S_SPLINT_S */
/*
* From getaddrinfo(3):
* Normally, the application should try using the addresses in the
* order in which they are returned. The sorting function used within
* getaddrinfo() is defined in RFC 3484).
* From RFC 3484 (Section 10.3):
* The default policy table gives IPv6 addresses higher precedence than
* IPv4 addresses.
* Thus, with the default parameters, we get IPv6 addresses first.
*/
/*@-type@*/
for (rp = result; rp != NULL; rp = rp->ai_next) {
ret = NL_NOCONNECT;
if ((s = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol)) < 0)
ret = NL_NOSOCK;
else if (setsockopt
(s, SOL_SOCKET, SO_REUSEADDR, (char *)&one,
sizeof(one)) == -1) {
ret = NL_NOSOCKOPT;
} else {
if (bind_me) {
if (bind(s, rp->ai_addr, rp->ai_addrlen) == 0) {
ret = 0;
break;
}
} else {
if (connect(s, rp->ai_addr, rp->ai_addrlen) == 0) {
ret = 0;
break;
}
}
}
if (!BAD_SOCKET(s)) {
(void)close(s);
}
}
/*@+type@*/
#ifndef S_SPLINT_S
freeaddrinfo(result);
#endif /* S_SPLINT_S */
if (ret != 0 || BAD_SOCKET(s))
return ret;
#ifdef IPTOS_LOWDELAY
{
int opt = IPTOS_LOWDELAY;
/*@ -unrecog @*/
(void)setsockopt(s, IPPROTO_IP, IP_TOS, &opt, sizeof(opt));
#ifdef IPV6_TCLASS
(void)setsockopt(s, IPPROTO_IPV6, IPV6_TCLASS, &opt, sizeof(opt));
#endif
/*@ +unrecog @*/
}
#endif
#ifdef TCP_NODELAY
/*
* This is a good performance enhancement when the socket is going to
* be used to pass a lot of short commands. It prevents them from being
* delayed by the Nagle algorithm until they can be aggreagated into
* a large packet. See http://en.wikipedia.org/wiki/Nagle%27s_algorithm
* for discussion.
*/
if (type == SOCK_STREAM)
setsockopt(s, IPPROTO_TCP, TCP_NODELAY, (char *)&one, sizeof(one));
#endif
/* set socket to noblocking */
(void)fcntl(s, F_SETFL, fcntl(s, F_GETFL) | O_NONBLOCK);
return s;
/*@ +type +mustfreefresh @*/
}
/*@+mustfreefresh +usedef@*/
const char /*@observer@*/ *netlib_errstr(const int err)
{
switch (err) {
case NL_NOSERVICE:
return "can't get service entry";
case NL_NOHOST:
return "can't get host entry";
case NL_NOPROTO:
return "can't get protocol entry";
case NL_NOSOCK:
return "can't create socket";
case NL_NOSOCKOPT:
return "error SETSOCKOPT SO_REUSEADDR";
case NL_NOCONNECT:
return "can't connect to host/port pair";
default:
return "unknown error";
}
}
socket_t netlib_localsocket(const char *sockfile, int socktype)
/* acquire a connection to an existing Unix-domain socket */
{
int sock;
if ((sock = socket(AF_UNIX, socktype, 0)) < 0) {
return -1;
} else {
struct sockaddr_un saddr;
memset(&saddr, 0, sizeof(struct sockaddr_un));
saddr.sun_family = AF_UNIX;
(void)strlcpy(saddr.sun_path,
sockfile,
sizeof(saddr.sun_path));
/*@-unrecog@*/
if (connect(sock, (struct sockaddr *)&saddr, SUN_LEN(&saddr)) < 0) {
(void)close(sock);
return -2;
}
/*@+unrecog@*/
return sock;
}
}
char *netlib_sock2ip(socket_t fd)
/* retrieve the IP address corresponding to a socket */
{
sockaddr_t fsin;
socklen_t alen = (socklen_t) sizeof(fsin);
/*@i1@*/ static char ip[INET6_ADDRSTRLEN];
int r;
r = getpeername(fd, &(fsin.sa), &alen);
/*@ -branchstate -unrecog +boolint @*/
if (r == 0) {
switch (fsin.sa.sa_family) {
case AF_INET:
r = !inet_ntop(fsin.sa_in.sin_family, &(fsin.sa_in.sin_addr),
ip, sizeof(ip));
break;
#ifdef IPV6_ENABLE
case AF_INET6:
r = !inet_ntop((int)fsin.sa_in6.sin6_family, &(fsin.sa_in6.sin6_addr),
ip, sizeof(ip));
break;
#endif
default:
(void)strlcpy(ip, "<unknown AF>", sizeof(ip));
return ip;
}
}
if (r != 0) {
(void)strlcpy(ip, "<unknown>", sizeof(ip));
}
/*@ +branchstate +unrecog -boolint @*/
return ip;
}
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