Squashed 'third_party/libevent/' content from commit d8ceae8
Change-Id: I84e1b23561eb225b9f288717b028e6bc9e5a27e1
git-subtree-dir: third_party/libevent
git-subtree-split: d8ceae81b83f3d0a56e2f41d4c429b2702a8e302
diff --git a/sample/http-server.c b/sample/http-server.c
new file mode 100644
index 0000000..a63f3e9
--- /dev/null
+++ b/sample/http-server.c
@@ -0,0 +1,405 @@
+/*
+ A trivial static http webserver using Libevent's evhttp.
+
+ This is not the best code in the world, and it does some fairly stupid stuff
+ that you would never want to do in a production webserver. Caveat hackor!
+
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <sys/types.h>
+#include <sys/stat.h>
+
+#ifdef WIN32
+#include <winsock2.h>
+#include <ws2tcpip.h>
+#include <windows.h>
+#include <io.h>
+#include <fcntl.h>
+#ifndef S_ISDIR
+#define S_ISDIR(x) (((x) & S_IFMT) == S_IFDIR)
+#endif
+#else
+#include <sys/stat.h>
+#include <sys/socket.h>
+#include <signal.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <dirent.h>
+#endif
+
+#include <event2/event.h>
+#include <event2/http.h>
+#include <event2/buffer.h>
+#include <event2/util.h>
+#include <event2/keyvalq_struct.h>
+
+#ifdef _EVENT_HAVE_NETINET_IN_H
+#include <netinet/in.h>
+# ifdef _XOPEN_SOURCE_EXTENDED
+# include <arpa/inet.h>
+# endif
+#endif
+
+/* Compatibility for possible missing IPv6 declarations */
+#include "../util-internal.h"
+
+#ifdef WIN32
+#define stat _stat
+#define fstat _fstat
+#define open _open
+#define close _close
+#define O_RDONLY _O_RDONLY
+#endif
+
+char uri_root[512];
+
+static const struct table_entry {
+ const char *extension;
+ const char *content_type;
+} content_type_table[] = {
+ { "txt", "text/plain" },
+ { "c", "text/plain" },
+ { "h", "text/plain" },
+ { "html", "text/html" },
+ { "htm", "text/htm" },
+ { "css", "text/css" },
+ { "gif", "image/gif" },
+ { "jpg", "image/jpeg" },
+ { "jpeg", "image/jpeg" },
+ { "png", "image/png" },
+ { "pdf", "application/pdf" },
+ { "ps", "application/postsript" },
+ { NULL, NULL },
+};
+
+/* Try to guess a good content-type for 'path' */
+static const char *
+guess_content_type(const char *path)
+{
+ const char *last_period, *extension;
+ const struct table_entry *ent;
+ last_period = strrchr(path, '.');
+ if (!last_period || strchr(last_period, '/'))
+ goto not_found; /* no exension */
+ extension = last_period + 1;
+ for (ent = &content_type_table[0]; ent->extension; ++ent) {
+ if (!evutil_ascii_strcasecmp(ent->extension, extension))
+ return ent->content_type;
+ }
+
+not_found:
+ return "application/misc";
+}
+
+/* Callback used for the /dump URI, and for every non-GET request:
+ * dumps all information to stdout and gives back a trivial 200 ok */
+static void
+dump_request_cb(struct evhttp_request *req, void *arg)
+{
+ const char *cmdtype;
+ struct evkeyvalq *headers;
+ struct evkeyval *header;
+ struct evbuffer *buf;
+
+ switch (evhttp_request_get_command(req)) {
+ case EVHTTP_REQ_GET: cmdtype = "GET"; break;
+ case EVHTTP_REQ_POST: cmdtype = "POST"; break;
+ case EVHTTP_REQ_HEAD: cmdtype = "HEAD"; break;
+ case EVHTTP_REQ_PUT: cmdtype = "PUT"; break;
+ case EVHTTP_REQ_DELETE: cmdtype = "DELETE"; break;
+ case EVHTTP_REQ_OPTIONS: cmdtype = "OPTIONS"; break;
+ case EVHTTP_REQ_TRACE: cmdtype = "TRACE"; break;
+ case EVHTTP_REQ_CONNECT: cmdtype = "CONNECT"; break;
+ case EVHTTP_REQ_PATCH: cmdtype = "PATCH"; break;
+ default: cmdtype = "unknown"; break;
+ }
+
+ printf("Received a %s request for %s\nHeaders:\n",
+ cmdtype, evhttp_request_get_uri(req));
+
+ headers = evhttp_request_get_input_headers(req);
+ for (header = headers->tqh_first; header;
+ header = header->next.tqe_next) {
+ printf(" %s: %s\n", header->key, header->value);
+ }
+
+ buf = evhttp_request_get_input_buffer(req);
+ puts("Input data: <<<");
+ while (evbuffer_get_length(buf)) {
+ int n;
+ char cbuf[128];
+ n = evbuffer_remove(buf, cbuf, sizeof(cbuf));
+ if (n > 0)
+ (void) fwrite(cbuf, 1, n, stdout);
+ }
+ puts(">>>");
+
+ evhttp_send_reply(req, 200, "OK", NULL);
+}
+
+/* This callback gets invoked when we get any http request that doesn't match
+ * any other callback. Like any evhttp server callback, it has a simple job:
+ * it must eventually call evhttp_send_error() or evhttp_send_reply().
+ */
+static void
+send_document_cb(struct evhttp_request *req, void *arg)
+{
+ struct evbuffer *evb = NULL;
+ const char *docroot = arg;
+ const char *uri = evhttp_request_get_uri(req);
+ struct evhttp_uri *decoded = NULL;
+ const char *path;
+ char *decoded_path;
+ char *whole_path = NULL;
+ size_t len;
+ int fd = -1;
+ struct stat st;
+
+ if (evhttp_request_get_command(req) != EVHTTP_REQ_GET) {
+ dump_request_cb(req, arg);
+ return;
+ }
+
+ printf("Got a GET request for <%s>\n", uri);
+
+ /* Decode the URI */
+ decoded = evhttp_uri_parse(uri);
+ if (!decoded) {
+ printf("It's not a good URI. Sending BADREQUEST\n");
+ evhttp_send_error(req, HTTP_BADREQUEST, 0);
+ return;
+ }
+
+ /* Let's see what path the user asked for. */
+ path = evhttp_uri_get_path(decoded);
+ if (!path) path = "/";
+
+ /* We need to decode it, to see what path the user really wanted. */
+ decoded_path = evhttp_uridecode(path, 0, NULL);
+ if (decoded_path == NULL)
+ goto err;
+ /* Don't allow any ".."s in the path, to avoid exposing stuff outside
+ * of the docroot. This test is both overzealous and underzealous:
+ * it forbids aceptable paths like "/this/one..here", but it doesn't
+ * do anything to prevent symlink following." */
+ if (strstr(decoded_path, ".."))
+ goto err;
+
+ len = strlen(decoded_path)+strlen(docroot)+2;
+ if (!(whole_path = malloc(len))) {
+ perror("malloc");
+ goto err;
+ }
+ evutil_snprintf(whole_path, len, "%s/%s", docroot, decoded_path);
+
+ if (stat(whole_path, &st)<0) {
+ goto err;
+ }
+
+ /* This holds the content we're sending. */
+ evb = evbuffer_new();
+
+ if (S_ISDIR(st.st_mode)) {
+ /* If it's a directory, read the comments and make a little
+ * index page */
+#ifdef WIN32
+ HANDLE d;
+ WIN32_FIND_DATAA ent;
+ char *pattern;
+ size_t dirlen;
+#else
+ DIR *d;
+ struct dirent *ent;
+#endif
+ const char *trailing_slash = "";
+
+ if (!strlen(path) || path[strlen(path)-1] != '/')
+ trailing_slash = "/";
+
+#ifdef WIN32
+ dirlen = strlen(whole_path);
+ pattern = malloc(dirlen+3);
+ memcpy(pattern, whole_path, dirlen);
+ pattern[dirlen] = '\\';
+ pattern[dirlen+1] = '*';
+ pattern[dirlen+2] = '\0';
+ d = FindFirstFileA(pattern, &ent);
+ free(pattern);
+ if (d == INVALID_HANDLE_VALUE)
+ goto err;
+#else
+ if (!(d = opendir(whole_path)))
+ goto err;
+#endif
+
+ evbuffer_add_printf(evb, "<html>\n <head>\n"
+ " <title>%s</title>\n"
+ " <base href='%s%s%s'>\n"
+ " </head>\n"
+ " <body>\n"
+ " <h1>%s</h1>\n"
+ " <ul>\n",
+ decoded_path, /* XXX html-escape this. */
+ uri_root, path, /* XXX html-escape this? */
+ trailing_slash,
+ decoded_path /* XXX html-escape this */);
+#ifdef WIN32
+ do {
+ const char *name = ent.cFileName;
+#else
+ while ((ent = readdir(d))) {
+ const char *name = ent->d_name;
+#endif
+ evbuffer_add_printf(evb,
+ " <li><a href=\"%s\">%s</a>\n",
+ name, name);/* XXX escape this */
+#ifdef WIN32
+ } while (FindNextFileA(d, &ent));
+#else
+ }
+#endif
+ evbuffer_add_printf(evb, "</ul></body></html>\n");
+#ifdef WIN32
+ FindClose(d);
+#else
+ closedir(d);
+#endif
+ evhttp_add_header(evhttp_request_get_output_headers(req),
+ "Content-Type", "text/html");
+ } else {
+ /* Otherwise it's a file; add it to the buffer to get
+ * sent via sendfile */
+ const char *type = guess_content_type(decoded_path);
+ if ((fd = open(whole_path, O_RDONLY)) < 0) {
+ perror("open");
+ goto err;
+ }
+
+ if (fstat(fd, &st)<0) {
+ /* Make sure the length still matches, now that we
+ * opened the file :/ */
+ perror("fstat");
+ goto err;
+ }
+ evhttp_add_header(evhttp_request_get_output_headers(req),
+ "Content-Type", type);
+ evbuffer_add_file(evb, fd, 0, st.st_size);
+ }
+
+ evhttp_send_reply(req, 200, "OK", evb);
+ goto done;
+err:
+ evhttp_send_error(req, 404, "Document was not found");
+ if (fd>=0)
+ close(fd);
+done:
+ if (decoded)
+ evhttp_uri_free(decoded);
+ if (decoded_path)
+ free(decoded_path);
+ if (whole_path)
+ free(whole_path);
+ if (evb)
+ evbuffer_free(evb);
+}
+
+static void
+syntax(void)
+{
+ fprintf(stdout, "Syntax: http-server <docroot>\n");
+}
+
+int
+main(int argc, char **argv)
+{
+ struct event_base *base;
+ struct evhttp *http;
+ struct evhttp_bound_socket *handle;
+
+ unsigned short port = 0;
+#ifdef WIN32
+ WSADATA WSAData;
+ WSAStartup(0x101, &WSAData);
+#else
+ if (signal(SIGPIPE, SIG_IGN) == SIG_ERR)
+ return (1);
+#endif
+ if (argc < 2) {
+ syntax();
+ return 1;
+ }
+
+ base = event_base_new();
+ if (!base) {
+ fprintf(stderr, "Couldn't create an event_base: exiting\n");
+ return 1;
+ }
+
+ /* Create a new evhttp object to handle requests. */
+ http = evhttp_new(base);
+ if (!http) {
+ fprintf(stderr, "couldn't create evhttp. Exiting.\n");
+ return 1;
+ }
+
+ /* The /dump URI will dump all requests to stdout and say 200 ok. */
+ evhttp_set_cb(http, "/dump", dump_request_cb, NULL);
+
+ /* We want to accept arbitrary requests, so we need to set a "generic"
+ * cb. We can also add callbacks for specific paths. */
+ evhttp_set_gencb(http, send_document_cb, argv[1]);
+
+ /* Now we tell the evhttp what port to listen on */
+ handle = evhttp_bind_socket_with_handle(http, "0.0.0.0", port);
+ if (!handle) {
+ fprintf(stderr, "couldn't bind to port %d. Exiting.\n",
+ (int)port);
+ return 1;
+ }
+
+ {
+ /* Extract and display the address we're listening on. */
+ struct sockaddr_storage ss;
+ evutil_socket_t fd;
+ ev_socklen_t socklen = sizeof(ss);
+ char addrbuf[128];
+ void *inaddr;
+ const char *addr;
+ int got_port = -1;
+ fd = evhttp_bound_socket_get_fd(handle);
+ memset(&ss, 0, sizeof(ss));
+ if (getsockname(fd, (struct sockaddr *)&ss, &socklen)) {
+ perror("getsockname() failed");
+ return 1;
+ }
+ if (ss.ss_family == AF_INET) {
+ got_port = ntohs(((struct sockaddr_in*)&ss)->sin_port);
+ inaddr = &((struct sockaddr_in*)&ss)->sin_addr;
+ } else if (ss.ss_family == AF_INET6) {
+ got_port = ntohs(((struct sockaddr_in6*)&ss)->sin6_port);
+ inaddr = &((struct sockaddr_in6*)&ss)->sin6_addr;
+ } else {
+ fprintf(stderr, "Weird address family %d\n",
+ ss.ss_family);
+ return 1;
+ }
+ addr = evutil_inet_ntop(ss.ss_family, inaddr, addrbuf,
+ sizeof(addrbuf));
+ if (addr) {
+ printf("Listening on %s:%d\n", addr, got_port);
+ evutil_snprintf(uri_root, sizeof(uri_root),
+ "http://%s:%d",addr,got_port);
+ } else {
+ fprintf(stderr, "evutil_inet_ntop failed\n");
+ return 1;
+ }
+ }
+
+ event_base_dispatch(base);
+
+ return 0;
+}