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