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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; } |