#include <u.h>#define NOPLAN9DEFINES#include <libc.h> #include <sys/types.h>#include <netdb.h>#include <sys/un.h>#include <netinet/in.h> static char *nets[] = { "tcp", "udp", nil };#define CLASS(p) ((*(uchar*)(p))>>6) static struct {	char *net;	char *service;	int port;} porttbl[] = {	"tcp",	"9fs",	564,	"tcp",	"whoami",	565,	"tcp",	"guard",	566,	"tcp",	"ticket",	567,	"tcp",	"exportfs",	17007,	"tcp",	"rexexec",	17009,	"tcp",	"ncpu",	17010,	"tcp",	"cpu",	17013,	"tcp",	"venti",	17034,	"tcp",	"wiki",	17035,	"tcp",	"secstore",	5356,	"udp",	"dns",	53,	"tcp",	"dns",	53,}; static intparseip(char *host, u32int *pip){	uchar addr[4];	int x, i;	char *p; 	p = host;	for(i=0; i<4 && *p; i++){		x = strtoul(p, &p, 0);		if(x < 0 || x >= 256)			return -1;		if(*p != '.' && *p != 0)			return -1;		if(*p == '.')			p++;		addr[i] = x;	} 	switch(CLASS(addr)){	case 0:	case 1:		if(i == 3){			addr[3] = addr[2];			addr[2] = addr[1];			addr[1] = 0;		}else if(i == 2){			addr[3] = addr[1];			addr[2] = 0;			addr[1] = 0;		}else if(i != 4)			return -1;		break;	case 2:		if(i == 3){			addr[3] = addr[2];			addr[2] = 0;		}else if(i != 4)			return -1;		break;	}	*pip = *(u32int*)addr;	return 0;} intp9dialparse(char *addr, char **pnet, char **punix, u32int *phost, int *pport){	char *net, *host, *port, *e;	int i;	struct servent *se;	struct hostent *he;	struct sockaddr_un *sockun; 	*punix = nil;	net = addr;	if((host = strchr(net, '!')) == nil){		werrstr("malformed address");		return -1;	}	*host++ = 0;	if((port = strchr(host, '!')) == nil){		if(strcmp(net, "unix")==0 || strcmp(net, "net")==0){		Unix:			if(strlen(host)+1 > sizeof sockun->sun_path){				werrstr("unix socket name too long");				return -1;			}			*punix = host;			*pnet = "unix";			*phost = 0;			*pport = 0;			return 0;		}		werrstr("malformed address");		return -1;	}	*port++ = 0; 	if(*host == 0){		werrstr("malformed address (empty host)");		return -1;	}	if(*port == 0){		werrstr("malformed address (empty port)");		return -1;	} 	if(strcmp(net, "unix") == 0)		goto Unix; 	if(strcmp(net, "tcp")!=0 && strcmp(net, "udp")!=0 && strcmp(net, "net") != 0){		werrstr("bad network %s!%s!%s", net, host, port);		return -1;	} 	/* translate host */	if(strcmp(host, "*") == 0)		*phost = 0;	else if(parseip(host, phost) == 0)		{}	else if((he = gethostbyname(host)) != nil)		*phost = *(u32int*)(he->h_addr);	else{		werrstr("unknown host %s", host);		return -1;	} 	/* translate network and port; should return list rather than first */	if(strcmp(net, "net") == 0){		for(i=0; nets[i]; i++){			if((se = getservbyname(port, nets[i])) != nil){				*pnet = nets[i];				*pport = ntohs(se->s_port);				return 0;			}		}	} 	for(i=0; i<nelem(porttbl); i++){		if(strcmp(net, "net") == 0 || strcmp(porttbl[i].net, net) == 0)		if(strcmp(porttbl[i].service, port) == 0){			*pnet = porttbl[i].net;			*pport = porttbl[i].port;			return 0;		}	} 	if(strcmp(net, "net") == 0){		werrstr("unknown service net!*!%s", port);		return -1;	} 	if(strcmp(net, "tcp") != 0 && strcmp(net, "udp") != 0){		werrstr("unknown network %s", net);		return -1;	} 	*pnet = net;	i = strtol(port, &e, 0);	if(*e == 0){		*pport = i;		return 0;	} 	if((se = getservbyname(port, net)) != nil){		*pport = ntohs(se->s_port);		return 0;	}	werrstr("unknown service %s!*!%s", net, port);	return -1;}