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#include <u.h>
#define NOPLAN9DEFINES
#include <libc.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <sys/un.h>
#include <errno.h>
#undef sun
#define sun sockun
extern int _p9dialparse(char*, char**, char**, u32int*, int*);
int
_p9netfd(char *dir)
{
int fd;
if(strncmp(dir, "/dev/fd/", 8) != 0)
return -1;
fd = strtol(dir+8, &dir, 0);
if(*dir != 0)
return -1;
return fd;
}
static void
putfd(char *dir, int fd)
{
snprint(dir, NETPATHLEN, "/dev/fd/%d", fd);
}
#undef unix
int
p9announce(char *addr, char *dir)
{
int proto;
char *buf, *unix;
char *net;
u32int host;
int port, s;
int n;
socklen_t sn;
struct sockaddr_in sa;
struct sockaddr_un sun;
buf = strdup(addr);
if(buf == nil)
return -1;
if(_p9dialparse(buf, &net, &unix, &host, &port) < 0){
free(buf);
return -1;
}
if(strcmp(net, "tcp") == 0)
proto = SOCK_STREAM;
else if(strcmp(net, "udp") == 0)
proto = SOCK_DGRAM;
else if(strcmp(net, "unix") == 0)
goto Unix;
else{
werrstr("can only handle tcp, udp, and unix: not %s", net);
free(buf);
return -1;
}
free(buf);
memset(&sa, 0, sizeof sa);
memmove(&sa.sin_addr, &host, 4);
sa.sin_family = AF_INET;
sa.sin_port = htons(port);
if((s = socket(AF_INET, proto, 0)) < 0)
return -1;
sn = sizeof n;
if(port && getsockopt(s, SOL_SOCKET, SO_TYPE, (void*)&n, &sn) >= 0
&& n == SOCK_STREAM){
n = 1;
setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (char*)&n, sizeof n);
}
if(bind(s, (struct sockaddr*)&sa, sizeof sa) < 0){
close(s);
return -1;
}
if(proto == SOCK_STREAM){
listen(s, 8);
putfd(dir, s);
}
return s;
Unix:
memset(&sun, 0, sizeof sun);
sun.sun_family = AF_UNIX;
strcpy(sun.sun_path, unix);
if((s = socket(AF_UNIX, SOCK_STREAM, 0)) < 0)
return -1;
sn = sizeof sun;
if(bind(s, (struct sockaddr*)&sun, sizeof sun) < 0){
if(errno == EADDRINUSE
&& connect(s, (struct sockaddr*)&sun, sizeof sun) < 0
&& errno == ECONNREFUSED){
/* dead socket, so remove it */
remove(unix);
close(s);
if((s = socket(AF_UNIX, SOCK_STREAM, 0)) < 0)
return -1;
if(bind(s, (struct sockaddr*)&sun, sizeof sun) >= 0)
goto Success;
}
close(s);
return -1;
}
Success:
listen(s, 8);
putfd(dir, s);
return s;
}
int
p9listen(char *dir, char *newdir)
{
int fd, one;
if((fd = _p9netfd(dir)) < 0){
werrstr("bad 'directory' in listen: %s", dir);
return -1;
}
if((fd = accept(fd, nil, nil)) < 0)
return -1;
one = 1;
setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, (char*)&one, sizeof one);
putfd(newdir, fd);
return fd;
}
int
p9accept(int cfd, char *dir)
{
int fd;
if((fd = _p9netfd(dir)) < 0){
werrstr("bad 'directory' in accept");
return -1;
}
/* need to dup because the listen fd will be closed */
return dup(fd);
}
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