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