3dade5fe59
On some systems, the third argument of connect() and bind() is expected to be the length of the address family instead of the length of the sockaddr structure. R=rsc http://codereview.appspot.com/6489072
159 lines
3.0 KiB
C
159 lines
3.0 KiB
C
#include <u.h>
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#include <libc.h>
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#undef accept
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#undef announce
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#undef dial
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#undef setnetmtpt
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#undef hangup
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#undef listen
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#undef netmkaddr
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#undef reject
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <netinet/tcp.h>
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#include <sys/un.h>
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#include <netdb.h>
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#undef unix
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#define unix xunix
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static int
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isany(struct sockaddr_storage *ss)
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{
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switch(ss->ss_family){
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case AF_INET:
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return (((struct sockaddr_in*)ss)->sin_addr.s_addr == INADDR_ANY);
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case AF_INET6:
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return (memcmp(((struct sockaddr_in6*)ss)->sin6_addr.s6_addr,
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in6addr_any.s6_addr, sizeof (struct in6_addr)) == 0);
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}
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return 0;
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}
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static int
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addrlen(struct sockaddr_storage *ss)
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{
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switch(ss->ss_family){
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case AF_INET:
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return sizeof(struct sockaddr_in);
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case AF_INET6:
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return sizeof(struct sockaddr_in6);
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case AF_UNIX:
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return sizeof(struct sockaddr_un);
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}
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return 0;
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}
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int
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p9dial(char *addr, char *local, char *dummy2, int *dummy3)
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{
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char *buf;
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char *net, *unix;
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int port;
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int proto;
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socklen_t sn;
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int n;
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struct sockaddr_storage ss, ssl;
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int s;
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if(dummy2 || dummy3){
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werrstr("cannot handle extra arguments in dial");
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return -1;
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}
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buf = strdup(addr);
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if(buf == nil)
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return -1;
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if(p9dialparse(buf, &net, &unix, &ss, &port) < 0){
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free(buf);
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return -1;
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}
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if(strcmp(net, "unix") != 0 && isany(&ss)){
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werrstr("invalid dial address 0.0.0.0 (aka *)");
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free(buf);
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return -1;
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}
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if(strcmp(net, "tcp") == 0)
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proto = SOCK_STREAM;
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else if(strcmp(net, "udp") == 0)
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proto = SOCK_DGRAM;
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else if(strcmp(net, "unix") == 0)
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goto Unix;
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else{
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werrstr("can only handle tcp, udp, and unix: not %s", net);
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free(buf);
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return -1;
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}
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free(buf);
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if((s = socket(ss.ss_family, proto, 0)) < 0)
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return -1;
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if(local){
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buf = strdup(local);
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if(buf == nil){
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close(s);
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return -1;
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}
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if(p9dialparse(buf, &net, &unix, &ss, &port) < 0){
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badlocal:
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free(buf);
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close(s);
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return -1;
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}
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if(unix){
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werrstr("bad local address %s for dial %s", local, addr);
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goto badlocal;
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}
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sn = sizeof n;
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if(port && getsockopt(s, SOL_SOCKET, SO_TYPE, (void*)&n, &sn) >= 0
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&& n == SOCK_STREAM){
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n = 1;
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setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (char*)&n, sizeof n);
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}
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if(bind(s, (struct sockaddr*)&ssl, addrlen(&ssl)) < 0)
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goto badlocal;
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free(buf);
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}
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n = 1;
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setsockopt(s, SOL_SOCKET, SO_BROADCAST, &n, sizeof n);
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if(!isany(&ss)){
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if(connect(s, (struct sockaddr*)&ss, addrlen(&ss)) < 0){
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close(s);
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return -1;
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}
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}
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if(proto == SOCK_STREAM){
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int one = 1;
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setsockopt(s, IPPROTO_TCP, TCP_NODELAY, (char*)&one, sizeof one);
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}
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return s;
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Unix:
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if(local){
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werrstr("local address not supported on unix network");
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free(buf);
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return -1;
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}
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/* Allow regular files in addition to Unix sockets. */
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if((s = open(unix, ORDWR)) >= 0)
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return s;
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free(buf);
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if((s = socket(ss.ss_family, SOCK_STREAM, 0)) < 0){
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werrstr("socket: %r");
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return -1;
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}
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if(connect(s, (struct sockaddr*)&ss, addrlen(&ss)) < 0){
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werrstr("connect %s: %r", ((struct sockaddr_un*)&ss)->sun_path);
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close(s);
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return -1;
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}
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return s;
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}
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