From: Matthew John Cheetham <mjcheetham@xxxxxxxxxxx>
Introduce a mini HTTP server helper that in the future will be enhanced
to provide a frontend for the git-http-backend, with support for
arbitrary authentication schemes.
Right now, test-http-server is a pared-down copy of the git-daemon that
always returns a 501 Not Implemented response to all callers.
Signed-off-by: Matthew John Cheetham <mjcheetham@xxxxxxxxxxx>
---
Makefile | 2 +
contrib/buildsystems/CMakeLists.txt | 13 +
t/helper/.gitignore | 1 +
t/helper/test-http-server.c | 685 ++++++++++++++++++++++++++++
4 files changed, 701 insertions(+)
create mode 100644 t/helper/test-http-server.c
diff --git a/Makefile b/Makefile
index d93ad956e58..39b130f711d 100644
--- a/Makefile
+++ b/Makefile
@@ -1500,6 +1500,8 @@ else
endif
BASIC_CFLAGS += $(CURL_CFLAGS)
+ TEST_PROGRAMS_NEED_X += test-http-server
+
REMOTE_CURL_PRIMARY = git-remote-http$X
REMOTE_CURL_ALIASES = git-remote-https$X git-remote-ftp$X git-remote-ftps$X
REMOTE_CURL_NAMES = $(REMOTE_CURL_PRIMARY) $(REMOTE_CURL_ALIASES)
diff --git a/contrib/buildsystems/CMakeLists.txt b/contrib/buildsystems/CMakeLists.txt
index 787738e6fa3..45251695ce0 100644
--- a/contrib/buildsystems/CMakeLists.txt
+++ b/contrib/buildsystems/CMakeLists.txt
@@ -989,6 +989,19 @@ set(wrapper_scripts
set(wrapper_test_scripts
test-fake-ssh test-tool)
+if(CURL_FOUND)
+ list(APPEND wrapper_test_scripts test-http-server)
+
+ add_executable(test-http-server ${CMAKE_SOURCE_DIR}/t/helper/test-http-server.c)
+ target_link_libraries(test-http-server common-main)
+
+ if(MSVC)
+ set_target_properties(test-http-server
+ PROPERTIES RUNTIME_OUTPUT_DIRECTORY_DEBUG ${CMAKE_BINARY_DIR}/t/helper)
+ set_target_properties(test-http-server
+ PROPERTIES RUNTIME_OUTPUT_DIRECTORY_RELEASE ${CMAKE_BINARY_DIR}/t/helper)
+ endif()
+endif()
foreach(script ${wrapper_scripts})
file(STRINGS ${CMAKE_SOURCE_DIR}/wrap-for-bin.sh content NEWLINE_CONSUME)
diff --git a/t/helper/.gitignore b/t/helper/.gitignore
index 8c2ddcce95f..9aa9c752997 100644
--- a/t/helper/.gitignore
+++ b/t/helper/.gitignore
@@ -1,2 +1,3 @@
/test-tool
/test-fake-ssh
+/test-http-server
diff --git a/t/helper/test-http-server.c b/t/helper/test-http-server.c
new file mode 100644
index 00000000000..18f1f741305
--- /dev/null
+++ b/t/helper/test-http-server.c
@@ -0,0 +1,685 @@
+#include "config.h"
+#include "run-command.h"
+#include "strbuf.h"
+#include "string-list.h"
+#include "trace2.h"
+#include "version.h"
+#include "dir.h"
+#include "date.h"
+
+#define TR2_CAT "test-http-server"
+
+static const char *pid_file;
+static int verbose;
+static int reuseaddr;
+
+static const char test_http_auth_usage[] =
+"http-server [--verbose]\n"
+" [--timeout=<n>] [--init-timeout=<n>] [--max-connections=<n>]\n"
+" [--reuseaddr] [--pid-file=<file>]\n"
+" [--listen=<host_or_ipaddr>]* [--port=<n>]\n"
+;
+
+/* Timeout, and initial timeout */
+static unsigned int timeout;
+static unsigned int init_timeout;
+
+static void logreport(const char *label, const char *err, va_list params)
+{
+ struct strbuf msg = STRBUF_INIT;
+
+ strbuf_addf(&msg, "[%"PRIuMAX"] %s: ", (uintmax_t)getpid(), label);
+ strbuf_vaddf(&msg, err, params);
+ strbuf_addch(&msg, '\n');
+
+ fwrite(msg.buf, sizeof(char), msg.len, stderr);
+ fflush(stderr);
+
+ strbuf_release(&msg);
+}
+
+__attribute__((format (printf, 1, 2)))
+static void logerror(const char *err, ...)
+{
+ va_list params;
+ va_start(params, err);
+ logreport("error", err, params);
+ va_end(params);
+}
+
+__attribute__((format (printf, 1, 2)))
+static void loginfo(const char *err, ...)
+{
+ va_list params;
+ if (!verbose)
+ return;
+ va_start(params, err);
+ logreport("info", err, params);
+ va_end(params);
+}
+
+static void set_keep_alive(int sockfd)
+{
+ int ka = 1;
+
+ if (setsockopt(sockfd, SOL_SOCKET, SO_KEEPALIVE, &ka, sizeof(ka)) < 0) {
+ if (errno != ENOTSOCK)
+ logerror("unable to set SO_KEEPALIVE on socket: %s",
+ strerror(errno));
+ }
+}
+
+/*
+ * The code in this section is used by "worker" instances to service
+ * a single connection from a client. The worker talks to the client
+ * on 0 and 1.
+ */
+
+enum worker_result {
+ /*
+ * Operation successful.
+ * Caller *might* keep the socket open and allow keep-alive.
+ */
+ WR_OK = 0,
+
+ /*
+ * Various errors while processing the request and/or the response.
+ * Close the socket and clean up.
+ * Exit child-process with non-zero status.
+ */
+ WR_IO_ERROR = 1<<0,
+
+ /*
+ * Close the socket and clean up. Does not imply an error.
+ */
+ WR_HANGUP = 1<<1,
+
+ WR_STOP_THE_MUSIC = (WR_IO_ERROR | WR_HANGUP),
+};
+
+static enum worker_result worker(void)
+{
+ const char *response = "HTTP/1.1 501 Not Implemented\r\n";
+ char *client_addr = getenv("REMOTE_ADDR");
+ char *client_port = getenv("REMOTE_PORT");
+ enum worker_result wr = WR_OK;
+
+ if (client_addr)
+ loginfo("Connection from %s:%s", client_addr, client_port);
+
+ set_keep_alive(0);
+
+ while (1) {
+ if (write_in_full(1, response, strlen(response)) < 0) {
+ logerror("unable to write response");
+ wr = WR_IO_ERROR;
+ }
+
+ if (wr & WR_STOP_THE_MUSIC)
+ break;
+ }
+
+ close(0);
+ close(1);
+
+ return !!(wr & WR_IO_ERROR);
+}
+
+/*
+ * This section contains the listener and child-process management
+ * code used by the primary instance to accept incoming connections
+ * and dispatch them to async child process "worker" instances.
+ */
+
+static int addrcmp(const struct sockaddr_storage *s1,
+ const struct sockaddr_storage *s2)
+{
+ const struct sockaddr *sa1 = (const struct sockaddr*) s1;
+ const struct sockaddr *sa2 = (const struct sockaddr*) s2;
+
+ if (sa1->sa_family != sa2->sa_family)
+ return sa1->sa_family - sa2->sa_family;
+ if (sa1->sa_family == AF_INET)
+ return memcmp(&((struct sockaddr_in *)s1)->sin_addr,
+ &((struct sockaddr_in *)s2)->sin_addr,
+ sizeof(struct in_addr));
+#ifndef NO_IPV6
+ if (sa1->sa_family == AF_INET6)
+ return memcmp(&((struct sockaddr_in6 *)s1)->sin6_addr,
+ &((struct sockaddr_in6 *)s2)->sin6_addr,
+ sizeof(struct in6_addr));
+#endif
+ return 0;
+}
+
+static int max_connections = 32;
+
+static unsigned int live_children;
+
+static struct child {
+ struct child *next;
+ struct child_process cld;
+ struct sockaddr_storage address;
+} *firstborn;
+
+static void add_child(struct child_process *cld, struct sockaddr *addr, socklen_t addrlen)
+{
+ struct child *newborn, **cradle;
+
+ newborn = xcalloc(1, sizeof(*newborn));
+ live_children++;
+ memcpy(&newborn->cld, cld, sizeof(*cld));
+ memcpy(&newborn->address, addr, addrlen);
+ for (cradle = &firstborn; *cradle; cradle = &(*cradle)->next)
+ if (!addrcmp(&(*cradle)->address, &newborn->address))
+ break;
+ newborn->next = *cradle;
+ *cradle = newborn;
+}
+
+/*
+ * This gets called if the number of connections grows
+ * past "max_connections".
+ *
+ * We kill the newest connection from a duplicate IP.
+ */
+static void kill_some_child(void)
+{
+ const struct child *blanket, *next;
+
+ if (!(blanket = firstborn))
+ return;
+
+ for (; (next = blanket->next); blanket = next)
+ if (!addrcmp(&blanket->address, &next->address)) {
+ kill(blanket->cld.pid, SIGTERM);
+ break;
+ }
+}
+
+static void check_dead_children(void)
+{
+ int status;
+ pid_t pid;
+
+ struct child **cradle, *blanket;
+ for (cradle = &firstborn; (blanket = *cradle);)
+ if ((pid = waitpid(blanket->cld.pid, &status, WNOHANG)) > 1) {
+ const char *dead = "";
+ if (status)
+ dead = " (with error)";
+ loginfo("[%"PRIuMAX"] Disconnected%s", (uintmax_t)pid, dead);
+
+ /* remove the child */
+ *cradle = blanket->next;
+ live_children--;
+ child_process_clear(&blanket->cld);
+ free(blanket);
+ } else
+ cradle = &blanket->next;
+}
+
+static struct strvec cld_argv = STRVEC_INIT;
+static void handle(int incoming, struct sockaddr *addr, socklen_t addrlen)
+{
+ struct child_process cld = CHILD_PROCESS_INIT;
+
+ if (max_connections && live_children >= max_connections) {
+ kill_some_child();
+ sleep(1); /* give it some time to die */
+ check_dead_children();
+ if (live_children >= max_connections) {
+ close(incoming);
+ logerror("Too many children, dropping connection");
+ return;
+ }
+ }
+
+ if (addr->sa_family == AF_INET) {
+ char buf[128] = "";
+ struct sockaddr_in *sin_addr = (void *) addr;
+ inet_ntop(addr->sa_family, &sin_addr->sin_addr, buf, sizeof(buf));
+ strvec_pushf(&cld.env, "REMOTE_ADDR=%s", buf);
+ strvec_pushf(&cld.env, "REMOTE_PORT=%d",
+ ntohs(sin_addr->sin_port));
+#ifndef NO_IPV6
+ } else if (addr->sa_family == AF_INET6) {
+ char buf[128] = "";
+ struct sockaddr_in6 *sin6_addr = (void *) addr;
+ inet_ntop(AF_INET6, &sin6_addr->sin6_addr, buf, sizeof(buf));
+ strvec_pushf(&cld.env, "REMOTE_ADDR=[%s]", buf);
+ strvec_pushf(&cld.env, "REMOTE_PORT=%d",
+ ntohs(sin6_addr->sin6_port));
+#endif
+ }
+
+ strvec_pushv(&cld.args, cld_argv.v);
+ cld.in = incoming;
+ cld.out = dup(incoming);
+
+ if (cld.out < 0)
+ logerror("could not dup() `incoming`");
+ else if (start_command(&cld))
+ logerror("unable to fork");
+ else
+ add_child(&cld, addr, addrlen);
+}
+
+static void child_handler(int signo)
+{
+ /*
+ * Otherwise empty handler because systemcalls will get interrupted
+ * upon signal receipt
+ * SysV needs the handler to be rearmed
+ */
+ signal(SIGCHLD, child_handler);
+}
+
+static int set_reuse_addr(int sockfd)
+{
+ int on = 1;
+
+ if (!reuseaddr)
+ return 0;
+ return setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR,
+ &on, sizeof(on));
+}
+
+struct socketlist {
+ int *list;
+ size_t nr;
+ size_t alloc;
+};
+
+static const char *ip2str(int family, struct sockaddr *sin, socklen_t len)
+{
+#ifdef NO_IPV6
+ static char ip[INET_ADDRSTRLEN];
+#else
+ static char ip[INET6_ADDRSTRLEN];
+#endif
+
+ switch (family) {
+#ifndef NO_IPV6
+ case AF_INET6:
+ inet_ntop(family, &((struct sockaddr_in6*)sin)->sin6_addr, ip, len);
+ break;
+#endif
+ case AF_INET:
+ inet_ntop(family, &((struct sockaddr_in*)sin)->sin_addr, ip, len);
+ break;
+ default:
+ xsnprintf(ip, sizeof(ip), "<unknown>");
+ }
+ return ip;
+}
+
+#ifndef NO_IPV6
+
+static int setup_named_sock(char *listen_addr, int listen_port, struct socketlist *socklist)
+{
+ int socknum = 0;
+ char pbuf[NI_MAXSERV];
+ struct addrinfo hints, *ai0, *ai;
+ int gai;
+ long flags;
+
+ xsnprintf(pbuf, sizeof(pbuf), "%d", listen_port);
+ memset(&hints, 0, sizeof(hints));
+ hints.ai_family = AF_UNSPEC;
+ hints.ai_socktype = SOCK_STREAM;
+ hints.ai_protocol = IPPROTO_TCP;
+ hints.ai_flags = AI_PASSIVE;
+
+ gai = getaddrinfo(listen_addr, pbuf, &hints, &ai0);
+ if (gai) {
+ logerror("getaddrinfo() for %s failed: %s", listen_addr, gai_strerror(gai));
+ return 0;
+ }
+
+ for (ai = ai0; ai; ai = ai->ai_next) {
+ int sockfd;
+
+ sockfd = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
+ if (sockfd < 0)
+ continue;
+ if (sockfd >= FD_SETSIZE) {
+ logerror("Socket descriptor too large");
+ close(sockfd);
+ continue;
+ }
+
+#ifdef IPV6_V6ONLY
+ if (ai->ai_family == AF_INET6) {
+ int on = 1;
+ setsockopt(sockfd, IPPROTO_IPV6, IPV6_V6ONLY,
+ &on, sizeof(on));
+ /* Note: error is not fatal */
+ }
+#endif
+
+ if (set_reuse_addr(sockfd)) {
+ logerror("Could not set SO_REUSEADDR: %s", strerror(errno));
+ close(sockfd);
+ continue;
+ }
+
+ set_keep_alive(sockfd);
+
+ if (bind(sockfd, ai->ai_addr, ai->ai_addrlen) < 0) {
+ logerror("Could not bind to %s: %s",
+ ip2str(ai->ai_family, ai->ai_addr, ai->ai_addrlen),
+ strerror(errno));
+ close(sockfd);
+ continue; /* not fatal */
+ }
+ if (listen(sockfd, 5) < 0) {
+ logerror("Could not listen to %s: %s",
+ ip2str(ai->ai_family, ai->ai_addr, ai->ai_addrlen),
+ strerror(errno));
+ close(sockfd);
+ continue; /* not fatal */
+ }
+
+ flags = fcntl(sockfd, F_GETFD, 0);
+ if (flags >= 0)
+ fcntl(sockfd, F_SETFD, flags | FD_CLOEXEC);
+
+ ALLOC_GROW(socklist->list, socklist->nr + 1, socklist->alloc);
+ socklist->list[socklist->nr++] = sockfd;
+ socknum++;
+ }
+
+ freeaddrinfo(ai0);
+
+ return socknum;
+}
+
+#else /* NO_IPV6 */
+
+static int setup_named_sock(char *listen_addr, int listen_port, struct socketlist *socklist)
+{
+ struct sockaddr_in sin;
+ int sockfd;
+ long flags;
+
+ memset(&sin, 0, sizeof sin);
+ sin.sin_family = AF_INET;
+ sin.sin_port = htons(listen_port);
+
+ if (listen_addr) {
+ /* Well, host better be an IP address here. */
+ if (inet_pton(AF_INET, listen_addr, &sin.sin_addr.s_addr) <= 0)
+ return 0;
+ } else {
+ sin.sin_addr.s_addr = htonl(INADDR_ANY);
+ }
+
+ sockfd = socket(AF_INET, SOCK_STREAM, 0);
+ if (sockfd < 0)
+ return 0;
+
+ if (set_reuse_addr(sockfd)) {
+ logerror("Could not set SO_REUSEADDR: %s", strerror(errno));
+ close(sockfd);
+ return 0;
+ }
+
+ set_keep_alive(sockfd);
+
+ if (bind(sockfd, (struct sockaddr *)&sin, sizeof sin) < 0) {
+ logerror("Could not bind to %s: %s",
+ ip2str(AF_INET, (struct sockaddr *)&sin, sizeof(sin)),
+ strerror(errno));
+ close(sockfd);
+ return 0;
+ }
+
+ if (listen(sockfd, 5) < 0) {
+ logerror("Could not listen to %s: %s",
+ ip2str(AF_INET, (struct sockaddr *)&sin, sizeof(sin)),
+ strerror(errno));
+ close(sockfd);
+ return 0;
+ }
+
+ flags = fcntl(sockfd, F_GETFD, 0);
+ if (flags >= 0)
+ fcntl(sockfd, F_SETFD, flags | FD_CLOEXEC);
+
+ ALLOC_GROW(socklist->list, socklist->nr + 1, socklist->alloc);
+ socklist->list[socklist->nr++] = sockfd;
+ return 1;
+}
+
+#endif
+
+static void socksetup(struct string_list *listen_addr, int listen_port, struct socketlist *socklist)
+{
+ if (!listen_addr->nr)
+ setup_named_sock("127.0.0.1", listen_port, socklist);
+ else {
+ int i, socknum;
+ for (i = 0; i < listen_addr->nr; i++) {
+ socknum = setup_named_sock(listen_addr->items[i].string,
+ listen_port, socklist);
+
+ if (socknum == 0)
+ logerror("unable to allocate any listen sockets for host %s on port %u",
+ listen_addr->items[i].string, listen_port);
+ }
+ }
+}
+
+static int service_loop(struct socketlist *socklist)
+{
+ struct pollfd *pfd;
+ int i;
+
+ CALLOC_ARRAY(pfd, socklist->nr);
+
+ for (i = 0; i < socklist->nr; i++) {
+ pfd[i].fd = socklist->list[i];
+ pfd[i].events = POLLIN;
+ }
+
+ signal(SIGCHLD, child_handler);
+
+ for (;;) {
+ int i;
+ int nr_ready;
+ int timeout = (pid_file ? 100 : -1);
+
+ check_dead_children();
+
+ nr_ready = poll(pfd, socklist->nr, timeout);
+ if (nr_ready < 0) {
+ if (errno != EINTR) {
+ logerror("Poll failed, resuming: %s",
+ strerror(errno));
+ sleep(1);
+ }
+ continue;
+ }
+ else if (nr_ready == 0) {
+ /*
+ * If we have a pid_file, then we watch it.
+ * If someone deletes it, we shutdown the service.
+ * The shell scripts in the test suite will use this.
+ */
+ if (!pid_file || file_exists(pid_file))
+ continue;
+ goto shutdown;
+ }
+
+ for (i = 0; i < socklist->nr; i++) {
+ if (pfd[i].revents & POLLIN) {
+ union {
+ struct sockaddr sa;
+ struct sockaddr_in sai;
+#ifndef NO_IPV6
+ struct sockaddr_in6 sai6;
+#endif
+ } ss;
+ socklen_t sslen = sizeof(ss);
+ int incoming = accept(pfd[i].fd, &ss.sa, &sslen);
+ if (incoming < 0) {
+ switch (errno) {
+ case EAGAIN:
+ case EINTR:
+ case ECONNABORTED:
+ continue;
+ default:
+ die_errno("accept returned");
+ }
+ }
+ handle(incoming, &ss.sa, sslen);
+ }
+ }
+ }
+
+shutdown:
+ loginfo("Starting graceful shutdown (pid-file gone)");
+ for (i = 0; i < socklist->nr; i++)
+ close(socklist->list[i]);
+
+ return 0;
+}
+
+static int serve(struct string_list *listen_addr, int listen_port)
+{
+ struct socketlist socklist = { NULL, 0, 0 };
+
+ socksetup(listen_addr, listen_port, &socklist);
+ if (socklist.nr == 0)
+ die("unable to allocate any listen sockets on port %u",
+ listen_port);
+
+ loginfo("Ready to rumble");
+
+ /*
+ * Wait to create the pid-file until we've setup the sockets
+ * and are open for business.
+ */
+ if (pid_file)
+ write_file(pid_file, "%"PRIuMAX, (uintmax_t) getpid());
+
+ return service_loop(&socklist);
+}
+
+/*
+ * This section is executed by both the primary instance and all
+ * worker instances. So, yes, each child-process re-parses the
+ * command line argument and re-discovers how it should behave.
+ */
+
+int cmd_main(int argc, const char **argv)
+{
+ int listen_port = 0;
+ struct string_list listen_addr = STRING_LIST_INIT_NODUP;
+ int worker_mode = 0;
+ int i;
+
+ trace2_cmd_name("test-http-server");
+ setup_git_directory_gently(NULL);
+
+ for (i = 1; i < argc; i++) {
+ const char *arg = argv[i];
+ const char *v;
+
+ if (skip_prefix(arg, "--listen=", &v)) {
+ string_list_append(&listen_addr, xstrdup_tolower(v));
+ continue;
+ }
+ if (skip_prefix(arg, "--port=", &v)) {
+ char *end;
+ unsigned long n;
+ n = strtoul(v, &end, 0);
+ if (*v && !*end) {
+ listen_port = n;
+ continue;
+ }
+ }
+ if (!strcmp(arg, "--worker")) {
+ worker_mode = 1;
+ trace2_cmd_mode("worker");
+ continue;
+ }
+ if (!strcmp(arg, "--verbose")) {
+ verbose = 1;
+ continue;
+ }
+ if (skip_prefix(arg, "--timeout=", &v)) {
+ timeout = atoi(v);
+ continue;
+ }
+ if (skip_prefix(arg, "--init-timeout=", &v)) {
+ init_timeout = atoi(v);
+ continue;
+ }
+ if (skip_prefix(arg, "--max-connections=", &v)) {
+ max_connections = atoi(v);
+ if (max_connections < 0)
+ max_connections = 0; /* unlimited */
+ continue;
+ }
+ if (!strcmp(arg, "--reuseaddr")) {
+ reuseaddr = 1;
+ continue;
+ }
+ if (skip_prefix(arg, "--pid-file=", &v)) {
+ pid_file = v;
+ continue;
+ }
+
+ fprintf(stderr, "error: unknown argument '%s'\n", arg);
+ usage(test_http_auth_usage);
+ }
+
+ /* avoid splitting a message in the middle */
+ setvbuf(stderr, NULL, _IOFBF, 4096);
+
+ if (listen_port == 0)
+ listen_port = DEFAULT_GIT_PORT;
+
+ /*
+ * If no --listen=<addr> args are given, the setup_named_sock()
+ * code will use receive a NULL address and set INADDR_ANY.
+ * This exposes both internal and external interfaces on the
+ * port.
+ *
+ * Disallow that and default to the internal-use-only loopback
+ * address.
+ */
+ if (!listen_addr.nr)
+ string_list_append(&listen_addr, "127.0.0.1");
+
+ /*
+ * worker_mode is set in our own child process instances
+ * (that are bound to a connected socket from a client).
+ */
+ if (worker_mode)
+ return worker();
+
+ /*
+ * `cld_argv` is a bit of a clever hack. The top-level instance
+ * of test-http-server does the normal bind/listen/accept stuff.
+ * For each incoming socket, the top-level process spawns
+ * a child instance of test-http-server *WITH* the additional
+ * `--worker` argument. This causes the child to set `worker_mode`
+ * and immediately call `worker()` using the connected socket (and
+ * without the usual need for fork() or threads).
+ *
+ * The magic here is made possible because `cld_argv` is static
+ * and handle() (called by service_loop()) knows about it.
+ */
+ strvec_push(&cld_argv, argv[0]);
+ strvec_push(&cld_argv, "--worker");
+ for (i = 1; i < argc; ++i)
+ strvec_push(&cld_argv, argv[i]);
+
+ /*
+ * Setup primary instance to listen for connections.
+ */
+ return serve(&listen_addr, listen_port);
+}
--
gitgitgadget
