External/passt
1
0
Fork 0
mirror of https://passt.top/passt synced 2024-07-01 23:42:41 +00:00
Code Issues Packages Projects Releases Wiki Activity

Parse resolv.conf with new lineread implementation

Browse Source 
Switch the resolv.conf parsing in conf.c to use the new lineread
implementation.  This means that it can now handle a resolv.conf file which
contains blank lines.

There are quite a few other fragilities with the resolv.conf parsing, but
that's out of scope for this patch.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
David Gibson 2022-06-24 12:17:30 +10:00 committed by Stefano Brivio
parent dab2c6ee1f
commit c589917e71
1 changed files with 14 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

22
conf.c
View File

@ -38,6 +38,7 @@
#include "udp.h"
#include "tcp.h"
#include "pasta.h"
#include "lineread.h"
/**
* get_bound_ports() - Get maps of ports with bound sockets
@ -320,7 +321,9 @@ static void get_dns(struct ctx *c)
struct in6_addr *dns6 = &c->dns6[0];
struct fqdn *s = c->dns_search;
uint32_t *dns4 = &c->dns4[0];
char buf[BUFSIZ], *p, *end;
struct lineread resolvconf;
int line_len;
char *line, *p, *end;
dns4_set = !c->v4 || !!*dns4;
dns6_set = !c->v6 || !IN6_IS_ADDR_UNSPECIFIED(dns6);
@ -333,13 +336,14 @@ static void get_dns(struct ctx *c)
if ((fd = open("/etc/resolv.conf", O_RDONLY | O_CLOEXEC)) < 0)
goto out;
for (*buf = 0; line_read(buf, BUFSIZ, fd); *buf = 0) {
if (!dns_set && strstr(buf, "nameserver ") == buf) {
p = strrchr(buf, ' ');
lineread_init(&resolvconf, fd);
while ((line_len = lineread_get(&resolvconf, &line)) > 0) {
if (!dns_set && strstr(line, "nameserver ") == line) {
p = strrchr(line, ' ');
if (!p)
continue;
end = strpbrk(buf, "%\n");
end = strpbrk(line, "%\n");
if (end)
*end = 0;
@ -356,13 +360,13 @@ static void get_dns(struct ctx *c)
dns6++;
memset(dns6, 0, sizeof(*dns6));
}
} else if (!dnss_set && strstr(buf, "search ") == buf &&
} else if (!dnss_set && strstr(line, "search ") == line &&
s == c->dns_search) {
end = strpbrk(buf, "\n");
end = strpbrk(line, "\n");
if (end)
*end = 0;
if (!strtok(buf, " \t"))
if (!strtok(line, " \t"))
continue;
while (s - c->dns_search < ARRAY_SIZE(c->dns_search) - 1
@ -374,6 +378,8 @@ static void get_dns(struct ctx *c)
}
}
if (line_len < 0)
warn("Error reading /etc/resolv.conf: %s", strerror(errno));
close(fd);
out: