kaguya
43 lines
1014 B
C++
43 lines
1014 B
C++
#include <mlibc/resolv_conf.hpp>
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#include <mlibc/allocator.hpp>
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#include <stdio.h>
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#include <ctype.h>
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namespace mlibc {
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frg::optional<struct nameserver_data> get_nameserver() {
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auto file = fopen("/etc/resolv.conf", "r");
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if (!file)
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return frg::null_opt;
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char line[128];
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struct nameserver_data ret;
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while (fgets(line, 128, file)) {
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char *pos;
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if (!strchr(line, '\n') && !feof(file)) {
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// skip truncated lines
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for (int c = getc(file); c != '\n' && c != EOF; c = getc(file));
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continue;
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}
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// TODO(geert): resolv.conf can actually have multiple nameservers
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// but we just pick the first one for now
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if (!strncmp(line, "nameserver", 10) && isspace(line[10])) {
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char *end;
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for (pos = line + 11; isspace(*pos); pos++);
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for (end = pos; *end && !isspace(*end); end++);
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*end = '\0';
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ret.name = frg::string<MemoryAllocator>(
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pos, end - pos, getAllocator());
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break;
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}
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}
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fclose(file);
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if(ret.name.empty())
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return frg::null_opt;
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return ret;
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}
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} // namespace mlibc
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