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Allow longer nameservers.

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IPv6 nameservers can be significantly longer than 16 characters in length.
For example, `2001:0db8:85a3:0000:0000:8a2e:0370:7334` is 39 characters long,
and certain syntax elements (e.g. zone indices) can make them even longer.

This patch allows up to 256 characters for the nameserver, which is large
enough to contain the maximum length of any hostname (~253 ASCII characters),
and definitely enough for any IPv4 or IPv6 address.
This commit is contained in:
Robert Xiao
2025-08-24 23:55:19 -07:00
parent 63c386d0f8
commit 1b4c14edba
1 changed files with 4 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
src/util.c
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@@ -21,10 +21,10 @@
char *get_resolvconf_addr(void)
{
static char addr[16];
static char addr[257];
char *rv = NULL;
#ifndef WINDOWS32
char buf[80];
char buf[257];
FILE *fp;
#ifdef ANDROID
fp = popen("getprop net.dns1", "r");
@@ -32,7 +32,7 @@ char *get_resolvconf_addr(void)
err(1, "getprop net.dns1 failed");
if (fgets(buf, sizeof(buf), fp) == NULL)
err(1, "read getprop net.dns1 failed");
if (sscanf(buf, "%15s", addr) == 1)
if (sscanf(buf, "%256s", addr) == 1)
rv = addr;
pclose(fp);
#else
@@ -42,7 +42,7 @@ char *get_resolvconf_addr(void)
while (feof(fp) == 0) {
fgets(buf, sizeof(buf), fp);
if (sscanf(buf, "nameserver %15s", addr) == 1) {
if (sscanf(buf, "nameserver %256s", addr) == 1) {
rv = addr;
break;
}