[fusl] Update fusl

fusl/src/network/resolvconf.c

+#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[6])) {
+                                p += 6;
+                                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;
+}