95 lines
2.1 KiB
C
95 lines
2.1 KiB
C
#include "lookup.h"
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#include "stdio_impl.h"
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#include <ctype.h>
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#include <errno.h>
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#include <string.h>
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#include <stdlib.h>
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#include <netinet/in.h>
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int __get_resolv_conf(struct resolvconf *conf, char *search, size_t search_sz)
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{
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char line[256];
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unsigned char _buf[256];
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FILE *f, _f;
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int nns = 0;
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conf->ndots = 1;
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conf->timeout = 5;
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conf->attempts = 2;
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if (search) *search = 0;
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f = __fopen_rb_ca("/etc/resolv.conf", &_f, _buf, sizeof _buf);
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if (!f) switch (errno) {
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case ENOENT:
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case ENOTDIR:
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case EACCES:
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goto no_resolv_conf;
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default:
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return -1;
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}
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while (fgets(line, sizeof line, f)) {
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char *p, *z;
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if (!strchr(line, '\n') && !feof(f)) {
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/* Ignore lines that get truncated rather than
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* potentially misinterpreting them. */
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int c;
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do c = getc(f);
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while (c != '\n' && c != EOF);
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continue;
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}
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if (!strncmp(line, "options", 7) && isspace(line[7])) {
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p = strstr(line, "ndots:");
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if (p && isdigit(p[6])) {
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p += 6;
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unsigned long x = strtoul(p, &z, 10);
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if (z != p) conf->ndots = x > 15 ? 15 : x;
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}
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p = strstr(line, "attempts:");
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if (p && isdigit(p[9])) {
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p += 9;
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unsigned long x = strtoul(p, &z, 10);
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if (z != p) conf->attempts = x > 10 ? 10 : x;
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}
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p = strstr(line, "timeout:");
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if (p && (isdigit(p[8]) || p[8]=='.')) {
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p += 8;
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unsigned long x = strtoul(p, &z, 10);
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if (z != p) conf->timeout = x > 60 ? 60 : x;
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}
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continue;
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}
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if (!strncmp(line, "nameserver", 10) && isspace(line[10])) {
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if (nns >= MAXNS) continue;
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for (p=line+11; isspace(*p); p++);
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for (z=p; *z && !isspace(*z); z++);
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*z=0;
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if (__lookup_ipliteral(conf->ns+nns, p, AF_UNSPEC) > 0)
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nns++;
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continue;
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}
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if (!search) continue;
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if ((strncmp(line, "domain", 6) && strncmp(line, "search", 6))
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|| !isspace(line[6]))
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continue;
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for (p=line+7; isspace(*p); p++);
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size_t l = strlen(p);
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/* This can never happen anyway with chosen buffer sizes. */
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if (l >= search_sz) continue;
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memcpy(search, p, l+1);
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}
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__fclose_ca(f);
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no_resolv_conf:
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if (!nns) {
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__lookup_ipliteral(conf->ns, "127.0.0.1", AF_UNSPEC);
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nns = 1;
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}
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conf->nns = nns;
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return 0;
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}
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