mirror of
https://gitlab.freedesktop.org/NetworkManager/NetworkManager.git
synced 2026-02-07 01:40:53 +01:00
policy: preserve custom hostnames on local-mapping lines (rh #627269)
Try to preserve custom hostnames (ie, anything not a localhost* variant, the current hostname, or the previous hostname) when rewriting the 127.0.0.1/::1 localhost mapping lines.
This commit is contained in:
Dan Williams
parent
4a7c77ac95
commit
ee9ce6027b
4 changed files with 256 additions and 50 deletions
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@ -217,7 +217,7 @@ nm_policy_set_system_hostname (const char *new_hostname,
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char old_hostname[HOST_NAME_MAX + 1];
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int ret = 0;
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const char *name;
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gboolean set_hostname = TRUE, changed = FALSE;
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gboolean set_hostname = TRUE, changed = FALSE, old_valid = TRUE;
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if (new_hostname)
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g_warn_if_fail (strlen (new_hostname));
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@ -230,11 +230,15 @@ nm_policy_set_system_hostname (const char *new_hostname,
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if (ret != 0) {
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nm_log_warn (LOGD_DNS, "couldn't get the system hostname: (%d) %s",
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errno, strerror (errno));
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old_valid = FALSE;
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} else {
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/* Don't set the hostname if it isn't actually changing */
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if ( (new_hostname && !strcmp (old_hostname, new_hostname))
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|| (!new_hostname && !strcmp (old_hostname, FALLBACK_HOSTNAME4)))
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set_hostname = FALSE;
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if (old_hostname[0] == '\0')
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old_valid = FALSE;
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}
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if (set_hostname) {
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@ -255,6 +259,7 @@ nm_policy_set_system_hostname (const char *new_hostname,
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* /etc/hosts at all.
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*/
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if (!nm_policy_hosts_update_etc_hosts (name,
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old_valid ? old_hostname : NULL,
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FALLBACK_HOSTNAME4,
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FALLBACK_HOSTNAME6,
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ip4_addr,
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@ -28,6 +28,9 @@
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#include "nm-policy-hosts.h"
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#include "nm-logging.h"
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#define IP4_LH "127.0.0.1"
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#define IP6_LH "::1"
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gboolean
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nm_policy_hosts_find_token (const char *line, const char *token)
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{
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@ -56,7 +59,7 @@ nm_policy_hosts_find_token (const char *line, const char *token)
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static gboolean
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is_local_mapping (const char *str, gboolean ip6, const char *hostname)
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{
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const char *addr = ip6 ? "::1" : "127.0.0.1";
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const char *addr = ip6 ? IP6_LH : IP4_LH;
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const char *fallback = ip6 ? "localhost6" : "localhost";
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return ( !strncmp (str, addr, strlen (addr))
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@ -137,12 +140,71 @@ ip6_addr_matches (const char *str, const char *ip6_addr)
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return memcmp (&found, &given, sizeof (found)) == 0;
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}
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static char *
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get_custom_hostnames (const char *line,
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const char *hostname,
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const char *old_hostname)
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{
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char **items = NULL, **iter;
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guint start = 0;
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GString *str = NULL;
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char *custom = NULL;
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g_return_val_if_fail (line != NULL, NULL);
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if (!strncmp (line, IP4_LH, strlen (IP4_LH)))
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start = strlen (IP4_LH);
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else if (!strncmp (line, IP6_LH, strlen (IP6_LH)))
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start = strlen (IP6_LH);
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g_return_val_if_fail (start > 0, NULL);
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/* Split the line into tokens */
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items = g_strsplit_set (line + start, " \t", -1);
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if (!items)
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return NULL;
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str = g_string_sized_new (50);
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/* Ignore current & old hostnames, and localhost-anything */
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for (iter = items; iter && *iter; iter++) {
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if (*iter[0] == '\0')
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continue;
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if (hostname && !strcmp (*iter, hostname))
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continue;
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if (old_hostname && !strcmp (*iter, old_hostname))
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continue;
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if (!strcmp (*iter, "localhost"))
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continue;
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if (!strcmp (*iter, "localhost6"))
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continue;
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if (!strcmp (*iter, "localhost.localdomain"))
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continue;
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if (!strcmp (*iter, "localhost4.localdomain4"))
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continue;
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if (!strcmp (*iter, "localhost6.localdomain6"))
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continue;
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/* Found a custom hostname */
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g_string_append_c (str, '\t');
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g_string_append (str, *iter);
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}
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if (str->len)
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custom = g_string_free (str, FALSE);
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else
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g_string_free (str, TRUE);
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g_strfreev (items);
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return custom;
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}
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#define ADDED_TAG "# Added by NetworkManager"
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GString *
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nm_policy_get_etc_hosts (const char **lines,
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gsize existing_len,
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const char *hostname,
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const char *old_hostname,
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const char *fallback_hostname4,
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const char *fallback_hostname6,
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const char *ip4_addr,
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@ -163,7 +225,10 @@ nm_policy_get_etc_hosts (const char **lines,
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gboolean hostname6_is_fallback;
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gboolean host4_before = FALSE;
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gboolean host6_before = FALSE;
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gboolean no_stale = TRUE;
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char *short_hostname = NULL;
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char *custom4 = NULL;
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char *custom6 = NULL;
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g_return_val_if_fail (lines != NULL, FALSE);
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g_return_val_if_fail (hostname != NULL, FALSE);
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@ -181,21 +246,20 @@ nm_policy_get_etc_hosts (const char **lines,
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* If all these things exist we don't need to bother updating the file.
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*/
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if (!ip4_addr) {
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found_host4 = TRUE;
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if (!ip4_addr)
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host4_before = TRUE;
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}
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if (!ip6_addr) {
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found_host6 = TRUE;
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if (!ip6_addr)
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host6_before = TRUE;
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}
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/* Look for the four cases from above */
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for (line = lines; lines && *line; line++) {
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if (!strlen (*line) || (*line[0] == '#'))
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gboolean found_hostname = FALSE;
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if ((*line[0] == '\0') || (*line[0] == '#'))
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continue;
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if (nm_policy_hosts_find_token (*line, hostname)) {
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found_hostname = nm_policy_hosts_find_token (*line, hostname);
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if (found_hostname) {
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/* Found the current hostname on this line */
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if (ip4_addr && ip4_addr_matches (*line, ip4_addr)) {
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found_host4 = TRUE;
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@ -211,7 +275,7 @@ nm_policy_get_etc_hosts (const char **lines,
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* so make sure we update /etc/hosts.
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*/
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if (is_ip4_addr (*line))
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found_host4 = FALSE;
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no_stale = FALSE;
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}
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if (ip6_addr && ip6_addr_matches (*line, ip6_addr)) {
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@ -228,26 +292,54 @@ nm_policy_get_etc_hosts (const char **lines,
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* so make sure we update /etc/hosts.
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*/
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if (is_ip6_addr (*line))
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found_host6 = FALSE;
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no_stale = FALSE;
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}
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}
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if (is_local_mapping (*line, FALSE, "localhost")) {
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/* a 127.0.0.1 line containing 'localhost' */
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found_localhost4 = TRUE;
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custom4 = get_custom_hostnames (*line, hostname, old_hostname);
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if (!ip4_addr) {
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/* If there's no IP-specific mapping for the current hostname
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* but that hostname is present on in the local mapping line,
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* we've found our IPv4 hostname mapping. If the hostname is
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* the fallback *IPv6* hostname it's not going to show up in
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* the IPv4 local mapping though, so fake it.
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*/
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if (hostname6_is_fallback || found_hostname)
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found_host4 = TRUE;
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}
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} else if (is_local_mapping (*line, TRUE, "localhost6")) {
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/* a ::1 line containing 'localhost6' */
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found_localhost6 = TRUE;
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custom6 = get_custom_hostnames (*line, hostname, old_hostname);
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if (!ip6_addr) {
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/* If there's no IP-specific mapping for the current hostname
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* but that hostname is present on in the local mapping line,
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* we've found our IPv6 hostname mapping. If the hostname is
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* the fallback *IPv4* hostname it's not going to show up in
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* the IPv6 local mapping though, so fake it.
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*/
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if (hostname4_is_fallback || found_hostname)
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found_host6 = TRUE;
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}
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}
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if (found_localhost4 && found_host4 && found_localhost6 && found_host6 && host4_before && host6_before)
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return NULL; /* No update required */
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if ( found_localhost4
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&& found_host4
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&& found_localhost6
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&& found_host6
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&& host4_before
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&& host6_before
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&& no_stale)
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goto out; /* No update required */
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}
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contents = g_string_sized_new (existing_len ? existing_len + 100 : 200);
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if (!contents) {
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g_set_error_literal (error, 0, 0, "not enough memory");
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return NULL;
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goto out;
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}
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/* Find the short hostname, like 'foo' from 'foo.bar.baz'; we want to
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@ -277,8 +369,6 @@ nm_policy_get_etc_hosts (const char **lines,
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* 'localhost6'.
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*/
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for (line = lines, initial_comments = TRUE; lines && *line; line++) {
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gboolean add_line = TRUE;
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/* This is the first line after the initial comments */
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if (strlen (*line) && initial_comments && (*line[0] != '#')) {
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initial_comments = FALSE;
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@ -311,7 +401,10 @@ nm_policy_get_etc_hosts (const char **lines,
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if (short_hostname)
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g_string_append_printf (contents, "\t%s", short_hostname);
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}
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g_string_append_printf (contents, "\t%s\tlocalhost\n", fallback_hostname4);
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g_string_append_printf (contents, "\t%s\tlocalhost", fallback_hostname4);
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if (custom4)
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g_string_append (contents, custom4);
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g_string_append_c (contents, '\n');
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/* IPv6 localhost line */
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g_string_append (contents, "::1");
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@ -320,26 +413,23 @@ nm_policy_get_etc_hosts (const char **lines,
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if (short_hostname)
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g_string_append_printf (contents, "\t%s", short_hostname);
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}
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g_string_append_printf (contents, "\t%s\tlocalhost6\n", fallback_hostname6);
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g_string_append_printf (contents, "\t%s\tlocalhost6", fallback_hostname6);
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if (custom6)
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g_string_append (contents, custom6);
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g_string_append_c (contents, '\n');
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added = TRUE;
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}
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/* Don't add the original line if it is a localhost mapping */
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if (is_local_mapping (*line, FALSE, "localhost"))
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add_line = FALSE;
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else if (is_local_mapping (*line, FALSE, fallback_hostname4))
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add_line = FALSE;
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else if (is_local_mapping (*line, FALSE, hostname))
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add_line = FALSE;
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else if (is_local_mapping (*line, TRUE, "localhost6"))
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add_line = FALSE;
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else if (is_local_mapping (*line, TRUE, fallback_hostname6))
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add_line = FALSE;
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else if (is_local_mapping (*line, TRUE, hostname))
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add_line = FALSE;
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if ( !is_local_mapping (*line, FALSE, "localhost")
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&& !is_local_mapping (*line, FALSE, fallback_hostname4)
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&& !is_local_mapping (*line, FALSE, hostname)
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&& !is_local_mapping (*line, TRUE, "localhost6")
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&& !is_local_mapping (*line, TRUE, fallback_hostname6)
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&& !is_local_mapping (*line, TRUE, hostname)
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&& !strstr (*line, ADDED_TAG)) {
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if (add_line && !strstr (*line, ADDED_TAG)) {
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g_string_append (contents, *line);
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/* Only append the new line if this isn't the last line in the file */
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if (*(line+1))
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@ -370,12 +460,16 @@ nm_policy_get_etc_hosts (const char **lines,
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g_string_append_printf (contents, "::1\t%s\tlocalhost6\n", fallback_hostname6);
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}
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out:
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g_free (custom4);
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g_free (custom6);
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g_free (short_hostname);
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return contents;
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}
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gboolean
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nm_policy_hosts_update_etc_hosts (const char *hostname,
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const char *old_hostname,
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const char *fallback_hostname4,
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const char *fallback_hostname6,
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const char *ip4_addr,
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@ -405,6 +499,7 @@ nm_policy_hosts_update_etc_hosts (const char *hostname,
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new_contents = nm_policy_get_etc_hosts ((const char **) lines,
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contents_len,
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hostname,
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old_hostname,
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fallback_hostname4,
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fallback_hostname6,
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ip4_addr,
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@ -24,6 +24,7 @@
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#include <glib.h>
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gboolean nm_policy_hosts_update_etc_hosts (const char *hostname,
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const char *old_hostname,
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const char *fallback_hostname4,
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const char *fallback_hostname6,
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const char *ip4_addr,
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@ -36,6 +37,7 @@ gboolean nm_policy_hosts_find_token (const char *line, const char *token);
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GString *nm_policy_get_etc_hosts (const char **lines,
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gsize existing_len,
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const char *hostname,
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const char *old_hostname,
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const char *fallback_hostname4,
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const char *fallback_hostname6,
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const char *ip4_addr,
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@ -26,6 +26,8 @@
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#define FALLBACK_HOSTNAME4 "localhost.localdomain"
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#define FALLBACK_HOSTNAME6 "localhost6.localdomain6"
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#define DEBUG 0
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static void
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test_generic (const char *before,
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const char *after,
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@ -43,6 +45,7 @@ test_generic (const char *before,
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newc = nm_policy_get_etc_hosts ((const char **) lines,
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strlen (before),
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hostname,
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NULL,
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FALLBACK_HOSTNAME4,
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FALLBACK_HOSTNAME6,
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ip4_addr,
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@ -56,11 +59,11 @@ test_generic (const char *before,
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g_clear_error (&error);
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} else if (after == NULL) {
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/* No change to /etc/hosts required */
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#if 0
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#if DEBUG
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if (newc != NULL) {
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g_message ("\n- NEW ---------------------------------\n"
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"%s"
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"- EXPECTED NONE -------------------------\n",
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"+ EXPECTED NONE +++++++++++++++++++++++++\n",
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newc->str);
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}
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#endif
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@ -70,10 +73,10 @@ test_generic (const char *before,
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g_assert (newc != NULL);
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g_assert (error == NULL);
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#if 0
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#if DEBUG
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g_message ("\n- NEW ---------------------------------\n"
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"%s"
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"- EXPECTED ------------------------------\n"
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"+ EXPECTED ++++++++++++++++++++++++++++++\n"
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"%s"
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"^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n",
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newc->str, after);
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@ -167,10 +170,17 @@ static const char *named_generic_before = \
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"::1 localhost6.localdomain6 localhost6\n"
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"127.0.0.1 lcmd.us.intellitxt.com\n";
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static const char *named_generic_after = \
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"# Do not remove the following line, or various programs\n"
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"# that require network functionality will fail.\n"
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"127.0.0.1 playboy localhost.localdomain localhost\n"
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"::1 playboy localhost6.localdomain6 localhost6\n"
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"127.0.0.1 lcmd.us.intellitxt.com\n";
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static void
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test_hosts_named_generic (void)
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{
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test_generic (named_generic_before, NULL, "playboy", NULL, NULL, FALSE);
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test_generic (named_generic_before, named_generic_after, "playboy", NULL, NULL, FALSE);
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}
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/*******************************************/
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@ -609,24 +619,114 @@ static const char *long_before = \
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"127.0.0.1 ad.doubleclick.net\n"
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"127.0.0.1 oascentral.movietickets.com\n"
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"127.0.0.1 view.atdmt.com\n"
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"127.0.0.1 ads.chumcity.com\n"
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"127.0.0.1 ads.as4x.tmcs.net\n"
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"127.0.0.1 n4403ad.doubleclick.net\n"
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"127.0.0.1 www.assoc-amazon.com\n"
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"127.0.0.1 s25.sitemeter.com\n"
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"127.0.0.1 adlog.com.com\n"
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"127.0.0.1 ahs.laptopmag.com\n"
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"127.0.0.1 altfarm.mediaplex.com\n"
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"127.0.0.1 ads.addynamix.com\n"
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"127.0.0.1 srx.main.ebayrtm.com\n"
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"127.0.0.1 cdn5.tribalfusion.com\n"
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"127.0.0.1 a.tribalfusion.com\n";
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"127.0.0.1 ads.chumcity.com\n";
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static const char *long_after = \
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"# Do not remove the following line, or various programs\n"
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"# that require network functionality will fail.\n"
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"127.0.0.1 comet localhost.localdomain localhost\n"
|
||||
"::1 comet localhost6.localdomain6 localhost6\n"
|
||||
"\n"
|
||||
"127.0.0.1 lcmd.us.intellitxt.com\n"
|
||||
"127.0.0.1 adserver.adtech.de\n"
|
||||
"127.0.0.1 a.as-us.falkag.net\n"
|
||||
"127.0.0.1 a.as-eu.falkag.net\n"
|
||||
"127.0.0.1 ads.doubleclick.com\n"
|
||||
"\n"
|
||||
"# random comment\n"
|
||||
"127.0.0.1 m1.2mdn.net\n"
|
||||
"127.0.0.1 ds.serving-sys.com\n"
|
||||
"127.0.0.1 pagead2.googlesyndication.com\n"
|
||||
"127.0.0.1 ad.doubleclick.com\n"
|
||||
"127.0.0.1 ad.doubleclick.net\n"
|
||||
"127.0.0.1 oascentral.movietickets.com\n"
|
||||
"127.0.0.1 view.atdmt.com\n"
|
||||
"127.0.0.1 ads.chumcity.com\n";
|
||||
|
||||
static void
|
||||
test_hosts_long (void)
|
||||
{
|
||||
test_generic (long_before, NULL, "comet", NULL, NULL, FALSE);
|
||||
test_generic (long_before, long_after, "comet", NULL, NULL, FALSE);
|
||||
}
|
||||
|
||||
/*******************************************/
|
||||
|
||||
static const char *custom4_before = \
|
||||
"# Do not remove the following line, or various programs\n"
|
||||
"# that require network functionality will fail.\n"
|
||||
"127.0.0.1 localhost.localdomain localhost pintglass\n"
|
||||
"::1 localhost6.localdomain6 localhost6\n";
|
||||
|
||||
static const char *custom4_after = \
|
||||
"# Do not remove the following line, or various programs\n"
|
||||
"# that require network functionality will fail.\n"
|
||||
"127.0.0.1 comet localhost.localdomain localhost pintglass\n"
|
||||
"::1 comet localhost6.localdomain6 localhost6\n";
|
||||
|
||||
static void
|
||||
test_hosts_custom4 (void)
|
||||
{
|
||||
test_generic (custom4_before, custom4_after, "comet", NULL, NULL, FALSE);
|
||||
}
|
||||
|
||||
/*******************************************/
|
||||
|
||||
static const char *custom6_before = \
|
||||
"# Do not remove the following line, or various programs\n"
|
||||
"# that require network functionality will fail.\n"
|
||||
"127.0.0.1 localhost.localdomain localhost\n"
|
||||
"::1 localhost6.localdomain6 localhost6 pintglass\n";
|
||||
|
||||
static const char *custom6_after = \
|
||||
"# Do not remove the following line, or various programs\n"
|
||||
"# that require network functionality will fail.\n"
|
||||
"127.0.0.1 comet localhost.localdomain localhost\n"
|
||||
"::1 comet localhost6.localdomain6 localhost6 pintglass\n";
|
||||
|
||||
static void
|
||||
test_hosts_custom6 (void)
|
||||
{
|
||||
test_generic (custom6_before, custom6_after, "comet", NULL, NULL, FALSE);
|
||||
}
|
||||
|
||||
/*******************************************/
|
||||
|
||||
static const char *custom46_before = \
|
||||
"# Do not remove the following line, or various programs\n"
|
||||
"# that require network functionality will fail.\n"
|
||||
"127.0.0.1 localhost.localdomain localhost shotglass\n"
|
||||
"::1 localhost6.localdomain6 localhost6 pintglass\n";
|
||||
|
||||
static const char *custom46_after = \
|
||||
"# Do not remove the following line, or various programs\n"
|
||||
"# that require network functionality will fail.\n"
|
||||
"127.0.0.1 comet localhost.localdomain localhost shotglass\n"
|
||||
"::1 comet localhost6.localdomain6 localhost6 pintglass\n";
|
||||
|
||||
static void
|
||||
test_hosts_custom46 (void)
|
||||
{
|
||||
test_generic (custom46_before, custom46_after, "comet", NULL, NULL, FALSE);
|
||||
}
|
||||
|
||||
/*******************************************/
|
||||
|
||||
static const char *custom46_mixed_before = \
|
||||
"# Do not remove the following line, or various programs\n"
|
||||
"# that require network functionality will fail.\n"
|
||||
"127.0.0.1 localhost.localdomain localhost shotglass\n"
|
||||
"::1 localhost6.localdomain6 localhost6 pintglass\n";
|
||||
|
||||
static const char *custom46_mixed_after = \
|
||||
"# Do not remove the following line, or various programs\n"
|
||||
"# that require network functionality will fail.\n"
|
||||
"127.0.0.1 comet localhost.localdomain localhost shotglass\n"
|
||||
"::1 comet localhost6.localdomain6 localhost6 pintglass\n";
|
||||
|
||||
static void
|
||||
test_hosts_custom46_mixed (void)
|
||||
{
|
||||
test_generic (custom46_mixed_before, custom46_mixed_after, "comet", NULL, NULL, FALSE);
|
||||
}
|
||||
|
||||
/*******************************************/
|
||||
|
|
@ -712,6 +812,10 @@ int main (int argc, char **argv)
|
|||
g_test_suite_add (suite, TESTCASE (test_hosts_no_host4, NULL));
|
||||
g_test_suite_add (suite, TESTCASE (test_hosts_no_host6, NULL));
|
||||
g_test_suite_add (suite, TESTCASE (test_hosts_long, NULL));
|
||||
g_test_suite_add (suite, TESTCASE (test_hosts_custom4, NULL));
|
||||
g_test_suite_add (suite, TESTCASE (test_hosts_custom6, NULL));
|
||||
g_test_suite_add (suite, TESTCASE (test_hosts_custom46, NULL));
|
||||
g_test_suite_add (suite, TESTCASE (test_hosts_custom46_mixed, NULL));
|
||||
|
||||
return g_test_run ();
|
||||
}
|
||||
|
|
|
|||
Loading…
Add table
Reference in a new issue