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resolve: Add resolvconf as DNS manager

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Enable the systems that use resolvconf as DNS manager to be
configurable by iwd.
This commit is contained in:
Tim Kourt 2019-08-01 17:36:23 -07:00 committed by Denis Kenzior
parent e2ec571f06
commit 18c339beab
1 changed files with 113 additions and 0 deletions
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113
src/resolve.c
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@ -26,6 +26,8 @@
#include <errno.h>
#include <arpa/inet.h>
#include <sys/stat.h>
#include <stdio.h>
#include <ell/ell.h>
@ -240,6 +242,116 @@ static const struct resolve_method_ops resolve_method_systemd = {
.remove = resolve_systemd_remove,
};
#define RESOLVCONF_PATH "/sbin/resolvconf"
static void resolve_resolvconf_add_dns(uint32_t ifindex, uint8_t type,
char **dns_list, void *data)
{
bool *ready = data;
FILE *resolvconf;
struct l_string *content;
int error;
L_AUTO_FREE_VAR(char *, cmd) = NULL;
L_AUTO_FREE_VAR(char *, str) = NULL;
if (!*ready)
return;
cmd = l_strdup_printf(RESOLVCONF_PATH " -a %u", ifindex);
if (!(resolvconf = popen(cmd, "w"))) {
l_error("resolve: Failed to start %s (%s).", RESOLVCONF_PATH,
strerror(errno));
return;
}
content = l_string_new(0);
for (; *dns_list; dns_list++)
l_string_append_printf(content, "nameserver %s\n", *dns_list);
str = l_string_unwrap(content);
if (fprintf(resolvconf, "%s", str) < 0)
l_error("resolve: Failed to print into %s stdin.",
RESOLVCONF_PATH);
error = pclose(resolvconf);
if (error < 0)
l_error("resolve: Failed to close pipe to %s (%s).",
RESOLVCONF_PATH, strerror(errno));
else if (error > 0)
l_info("resolve: %s exited with status (%d).", RESOLVCONF_PATH,
error);
}
static void resolve_resolvconf_remove(uint32_t ifindex, void *data)
{
bool *ready = data;
FILE *resolvconf;
int error;
L_AUTO_FREE_VAR(char *, cmd) = NULL;
if (!*ready)
return;
cmd = l_strdup_printf(RESOLVCONF_PATH " -d %u", ifindex);
if (!(resolvconf = popen(cmd, "r"))) {
l_error("resolve: Failed to start %s (%s).", RESOLVCONF_PATH,
strerror(errno));
return;
}
error = pclose(resolvconf);
if (error < 0)
l_error("resolve: Failed to close pipe to %s (%s).",
RESOLVCONF_PATH, strerror(errno));
else if (error > 0)
l_info("resolve: %s exited with status (%d).", RESOLVCONF_PATH,
error);
}
static void *resolve_resolvconf_init(void)
{
struct stat st;
bool *ready;
ready = l_new(bool, 1);
if (stat(RESOLVCONF_PATH, &st)) {
l_error("resolve: Could not stat %s (%s).", RESOLVCONF_PATH,
strerror(errno));
goto error;
}
if (!(st.st_mode & S_IXUSR)) {
l_error("resolve: %s is not executable.", RESOLVCONF_PATH);
goto error;
}
*ready = true;
return ready;
error:
*ready = false;
return ready;
}
static void resolve_resolvconf_exit(void *data)
{
bool *ready = data;
l_free(ready);
}
static const struct resolve_method_ops resolve_method_resolvconf = {
.init = resolve_resolvconf_init,
.exit = resolve_resolvconf_exit,
.add_dns = resolve_resolvconf_add_dns,
.remove = resolve_resolvconf_remove,
};
void resolve_add_dns(uint32_t ifindex, uint8_t type, char **dns_list)
{
if (!dns_list || !*dns_list)
@ -264,6 +376,7 @@ static const struct {
const struct resolve_method_ops *method_ops;
} resolve_method_ops_list[] = {
{ "systemd", &resolve_method_systemd },
{ "resolvconf", &resolve_method_resolvconf },
{ }
};