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resolve: Search more places for resolvconf exe

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Some distros put resolvconf in /usr/sbin instead of /sbin.  Do not try
to hard-code the path and instead search for it in more places.
This commit is contained in:
Denis Kenzior 2019-08-07 10:46:30 -05:00
parent a6e8622677
commit f6bb911d2c
1 changed files with 25 additions and 21 deletions
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46
src/resolve.c
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@ -28,6 +28,7 @@
#include <arpa/inet.h> #include <arpa/inet.h>
#include <sys/stat.h> #include <sys/stat.h>
#include <stdio.h> #include <stdio.h>
#include <unistd.h>
#include <ell/ell.h> #include <ell/ell.h>
@ -49,6 +50,7 @@ struct resolve_method {
}; };
static struct resolve_method method; static struct resolve_method method;
static char *RESOLVCONF_PATH;
#define SYSTEMD_RESOLVED_SERVICE "org.freedesktop.resolve1" #define SYSTEMD_RESOLVED_SERVICE "org.freedesktop.resolve1"
#define SYSTEMD_RESOLVED_MANAGER_PATH "/org/freedesktop/resolve1" #define SYSTEMD_RESOLVED_MANAGER_PATH "/org/freedesktop/resolve1"
@ -242,8 +244,6 @@ static const struct resolve_method_ops resolve_method_systemd = {
.remove = resolve_systemd_remove, .remove = resolve_systemd_remove,
}; };
#define RESOLVCONF_PATH "/sbin/resolvconf"
static void resolve_resolvconf_add_dns(uint32_t ifindex, uint8_t type, static void resolve_resolvconf_add_dns(uint32_t ifindex, uint8_t type,
char **dns_list, void *data) char **dns_list, void *data)
{ {
@ -257,7 +257,7 @@ static void resolve_resolvconf_add_dns(uint32_t ifindex, uint8_t type,
if (!*ready) if (!*ready)
return; return;
cmd = l_strdup_printf(RESOLVCONF_PATH " -a %u", ifindex); cmd = l_strdup_printf("%s -a %u", RESOLVCONF_PATH, ifindex);
if (!(resolvconf = popen(cmd, "w"))) { if (!(resolvconf = popen(cmd, "w"))) {
l_error("resolve: Failed to start %s (%s).", RESOLVCONF_PATH, l_error("resolve: Failed to start %s (%s).", RESOLVCONF_PATH,
@ -295,7 +295,7 @@ static void resolve_resolvconf_remove(uint32_t ifindex, void *data)
if (!*ready) if (!*ready)
return; return;
cmd = l_strdup_printf(RESOLVCONF_PATH " -d %u", ifindex); cmd = l_strdup_printf("%s -d %u", RESOLVCONF_PATH, ifindex);
if (!(resolvconf = popen(cmd, "r"))) { if (!(resolvconf = popen(cmd, "r"))) {
l_error("resolve: Failed to start %s (%s).", RESOLVCONF_PATH, l_error("resolve: Failed to start %s (%s).", RESOLVCONF_PATH,
@ -314,27 +314,30 @@ static void resolve_resolvconf_remove(uint32_t ifindex, void *data)
static void *resolve_resolvconf_init(void) static void *resolve_resolvconf_init(void)
{ {
struct stat st; static const char *default_path = "/sbin:/usr/sbin";
bool *ready; bool *ready;
const char *path;
ready = l_new(bool, 1); 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; *ready = false;
l_debug("Trying to find resolvconf in $PATH");
path = getenv("PATH");
if (path)
RESOLVCONF_PATH = l_path_find("resolvconf", path, X_OK);
if (!RESOLVCONF_PATH) {
l_debug("Trying to find resolvconf in default paths");
RESOLVCONF_PATH = l_path_find("resolvconf", default_path, X_OK);
}
if (!RESOLVCONF_PATH) {
l_error("No usable resolvconf found on system");
return ready;
}
l_debug("resolvconf found as: %s", RESOLVCONF_PATH);
*ready = true;
return ready; return ready;
} }
@ -342,6 +345,7 @@ static void resolve_resolvconf_exit(void *data)
{ {
bool *ready = data; bool *ready = data;
RESOLVCONF_PATH = NULL;
l_free(ready); l_free(ready);
} }