diff options
Diffstat (limited to 'libc-top-half/musl/src/network/resolvconf.c')
-rw-r--r-- | libc-top-half/musl/src/network/resolvconf.c | 94 |
1 files changed, 94 insertions, 0 deletions
diff --git a/libc-top-half/musl/src/network/resolvconf.c b/libc-top-half/musl/src/network/resolvconf.c new file mode 100644 index 0000000..ceabf08 --- /dev/null +++ b/libc-top-half/musl/src/network/resolvconf.c @@ -0,0 +1,94 @@ +#include "lookup.h" +#include "stdio_impl.h" +#include <ctype.h> +#include <errno.h> +#include <string.h> +#include <stdlib.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; +} |