mirror of
https://github.com/9fans/plan9port.git
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68 lines
1.1 KiB
C
68 lines
1.1 KiB
C
#include <u.h>
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#include <libc.h>
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#include <bio.h>
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#include <ndb.h>
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#include <ndbhf.h>
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/*
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* look up the ip attributes 'list' for an entry that has the
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* given 'attr=val' and a 'ip=' tuples.
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*
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* return nil if not found.
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*/
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Ndbtuple*
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csipinfo(char *netroot, char *attr, char *val, char **list, int n)
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{
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Ndbtuple *t, *first, *last;
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int i;
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char line[1024];
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int fd;
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char *p, *e;
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if(netroot)
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snprint(line, sizeof(line), "%s/cs", netroot);
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else
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strcpy(line, "/net/cs");
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fd = open(line, ORDWR);
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if(fd < 0)
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return 0;
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seek(fd, 0, 0);
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e = line + sizeof(line);
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p = seprint(line, e, "!ipinfo %s=%s", attr, val);
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for(i = 0; i < n; i++){
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if(*list == nil)
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break;
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p = seprint(p, e, " %s", *list++);
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}
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if(write(fd, line, strlen(line)) < 0){
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close(fd);
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return 0;
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}
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seek(fd, 0, 0);
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first = last = 0;
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for(;;){
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n = read(fd, line, sizeof(line)-2);
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if(n <= 0)
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break;
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line[n] = '\n';
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line[n+1] = 0;
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t = _ndbparseline(line);
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if(t == 0)
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continue;
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if(first)
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last->entry = t;
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else
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first = t;
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last = t;
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while(last->entry)
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last = last->entry;
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}
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close(fd);
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setmalloctag(first, getcallerpc(&netroot));
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return first;
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}
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