diff options
| -rw-r--r-- | ChangeLog | 7 | ||||
| -rw-r--r-- | resolv/tst-resolv-res_init-skeleton.c | 78 |
2 files changed, 85 insertions, 0 deletions
@@ -1,5 +1,12 @@ 2017-06-27 Florian Weimer <fweimer@redhat.com> + Work around test timeouts with ICMP rate limiting on localhost. + * resolv/tst-resolv-res_init-skeleton.c (start_dummy_server): New + function. + (do_test): Call it. + +2017-06-27 Florian Weimer <fweimer@redhat.com> + Call _res_hconf_init from __res_vinit. * inet/gethstbyad_r.c (NEED__RES_HCONF): Remove. * inet/gethstbynm2_r.c (NEED__RES_HCONF): Likewise. diff --git a/resolv/tst-resolv-res_init-skeleton.c b/resolv/tst-resolv-res_init-skeleton.c index 1d2c475..2b68c5f 100644 --- a/resolv/tst-resolv-res_init-skeleton.c +++ b/resolv/tst-resolv-res_init-skeleton.c @@ -21,6 +21,7 @@ in. */ #include <arpa/inet.h> +#include <errno.h> #include <gnu/lib-names.h> #include <netdb.h> #include <resolv/resolv-internal.h> /* For DEPRECATED_RES_USE_INET6. */ @@ -33,6 +34,7 @@ #include <support/support.h> #include <support/temp_file.h> #include <support/test-driver.h> +#include <support/xsocket.h> #include <support/xstdio.h> #include <support/xunistd.h> @@ -527,6 +529,73 @@ test_file_contents (const struct test_case *t) } } +/* Dummy DNS server. It ensures that the probe queries sent by + gethostbyname and getaddrinfo receive a reply even if the system + applies a very strict rate limit to localhost. */ +static pid_t +start_dummy_server (void) +{ + int server_socket = xsocket (AF_INET, SOCK_DGRAM, 0); + { + struct sockaddr_in sin = + { + .sin_family = AF_INET, + .sin_addr = { .s_addr = htonl (INADDR_LOOPBACK) }, + .sin_port = htons (53), + }; + int ret = bind (server_socket, (struct sockaddr *) &sin, sizeof (sin)); + if (ret < 0) + { + if (errno == EACCES) + /* The port is reserved, which means we cannot start the + server. */ + return -1; + FAIL_EXIT1 ("cannot bind socket to port 53: %m"); + } + } + + pid_t pid = xfork (); + if (pid == 0) + { + /* Child process. Echo back queries as SERVFAIL responses. */ + while (true) + { + union + { + HEADER header; + unsigned char bytes[512]; + } packet; + struct sockaddr_in sin; + socklen_t sinlen = sizeof (sin); + + ssize_t ret = recvfrom + (server_socket, &packet, sizeof (packet), + MSG_NOSIGNAL, (struct sockaddr *) &sin, &sinlen); + if (ret < 0) + FAIL_EXIT1 ("recvfrom on fake server socket: %m"); + if (ret > sizeof (HEADER)) + { + /* Turn the query into a SERVFAIL response. */ + packet.header.qr = 1; + packet.header.rcode = ns_r_servfail; + + /* Send the response. */ + ret = sendto (server_socket, &packet, ret, + MSG_NOSIGNAL, (struct sockaddr *) &sin, sinlen); + if (ret < 0) + /* The peer may have closed socket prematurely, so + this is not an error. */ + printf ("warning: sending DNS server reply: %m\n"); + } + } + } + + /* In the parent, close the socket. */ + xclose (server_socket); + + return pid; +} + static int do_test (void) { @@ -552,6 +621,8 @@ do_test (void) support_capture_subprocess_free (&proc); } + pid_t server = start_dummy_server (); + for (size_t i = 0; test_cases[i].name != NULL; ++i) { if (test_verbose > 0) @@ -590,6 +661,13 @@ do_test (void) } } + if (server > 0) + { + if (kill (server, SIGTERM) < 0) + FAIL_EXIT1 ("could not terminate server process: %m"); + xwaitpid (server, NULL, 0); + } + free (path_chroot); path_chroot = NULL; free (path_resolv_conf); |