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in hosts file lookups, use only first match for canonical name

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the existing code clobbered the canonical name already discovered
every time another matching line was found, which will necessarily be
the case when a hostname has both IPv4 and v6 definitions.

patch by Wolf.
This commit is contained in:
Rich Felker 2020-08-04 14:20:40 -04:00
parent 73cc775bee
commit 20c6d83f55
1 changed files with 7 additions and 2 deletions
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9
src/network/lookup_name.c
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@ -50,7 +50,7 @@ static int name_from_hosts(struct address buf[static MAXADDRS], char canon[stati
{
char line[512];
size_t l = strlen(name);
int cnt = 0, badfam = 0;
int cnt = 0, badfam = 0, have_canon = 0;
unsigned char _buf[1032];
FILE _f, *f = __fopen_rb_ca("/etc/hosts", &_f, _buf, sizeof _buf);
if (!f) switch (errno) {
@ -83,11 +83,16 @@ static int name_from_hosts(struct address buf[static MAXADDRS], char canon[stati
continue;
}
if (have_canon) continue;
/* Extract first name as canonical name */
for (; *p && isspace(*p); p++);
for (z=p; *z && !isspace(*z); z++);
*z = 0;
if (is_valid_hostname(p)) memcpy(canon, p, z-p+1);
if (is_valid_hostname(p)) {
have_canon = 1;
memcpy(canon, p, z-p+1);
}
}
__fclose_ca(f);
return cnt ? cnt : badfam;