/*  * This file is part of the UCB release of Plan 9. It is subject to the license * terms in the LICENSE file found in the top-level directory of this * distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No * part of the UCB release of Plan 9, including this file, may be copied, * modified, propagated, or distributed except according to the terms contained * in the LICENSE file. */ #include <u.h>#include <libc.h> static char *unknown = "???"; static voidgetendpoint(char *dir, char *file, char **sysp, char **servp){	int fd, n;	char buf[128];	char *sys, *serv; 	sys = serv = 0; 	snprint(buf, sizeof buf, "%s/%s", dir, file);	fd = open(buf, OREAD);	if(fd >= 0){		n = read(fd, buf, sizeof(buf)-1);		if(n>0){			buf[n-1] = 0;			serv = strchr(buf, '!');			if(serv){				*serv++ = 0;				serv = strdup(serv);			}			sys = strdup(buf);		}		close(fd);	}	if(serv == 0)		serv = unknown;	if(sys == 0)		sys = unknown;	*servp = serv;	*sysp = sys;} NetConnInfo*getnetconninfo(char *dir, int fd){	NetConnInfo *nci;	char *cp;	Dir *d;	char spec[10];	char path[128];	char netname[128], *p; 	/* get a directory address via fd */	if(dir == nil || *dir == 0){		if(fd2path(fd, path, sizeof(path)) < 0)			return nil;		cp = strrchr(path, '/');		if(cp == nil)			return nil;		*cp = 0;		dir = path;	} 	nci = mallocz(sizeof *nci, 1);	if(nci == nil)		return nil; 	/* copy connection directory */	nci->dir = strdup(dir);	if(nci->dir == nil)		goto err; 	/* get netroot */	nci->root = strdup(dir);	if(nci->root == nil)		goto err;	cp = strchr(nci->root+1, '/');	if(cp == nil)		goto err;	*cp = 0; 	/* figure out bind spec */	d = dirstat(nci->dir);	if(d != nil){		sprint(spec, "#%C%d", d->type, d->dev);		nci->spec = strdup(spec);	}	if(nci->spec == nil)		nci->spec = unknown;	free(d); 	/* get the two end points */	getendpoint(nci->dir, "local", &nci->lsys, &nci->lserv);	if(nci->lsys == nil || nci->lserv == nil)		goto err;	getendpoint(nci->dir, "remote", &nci->rsys, &nci->rserv);	if(nci->rsys == nil || nci->rserv == nil)		goto err; 	strecpy(netname, netname+sizeof netname, nci->dir);	if((p = strrchr(netname, '/')) != nil)		*p = 0;	if(strncmp(netname, "/net/", 5) == 0)		memmove(netname, netname+5, strlen(netname+5)+1);	nci->laddr = smprint("%s!%s!%s", netname, nci->lsys, nci->lserv);	nci->raddr = smprint("%s!%s!%s", netname, nci->rsys, nci->rserv);	if(nci->laddr == nil || nci->raddr == nil)		goto err;	return nci;err:	freenetconninfo(nci);	return nil;} static voidxfree(char *x){	if(x == nil || x == unknown)		return;	free(x);} voidfreenetconninfo(NetConnInfo *nci){	if(nci == nil)		return;	xfree(nci->root);	xfree(nci->dir);	xfree(nci->spec);	xfree(nci->lsys);	xfree(nci->lserv);	xfree(nci->rsys);	xfree(nci->rserv);	xfree(nci->laddr);	xfree(nci->raddr);	free(nci);}