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-rw-r--r--libevent/sample/http-server.c582
1 files changed, 582 insertions, 0 deletions
diff --git a/libevent/sample/http-server.c b/libevent/sample/http-server.c
new file mode 100644
index 0000000..049aabc
--- /dev/null
+++ b/libevent/sample/http-server.c
@@ -0,0 +1,582 @@
+/*
+ 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!
+
+ */
+
+/* Compatibility for possible missing IPv6 declarations */
+#include "../util-internal.h"
+
+#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 <getopt.h>
+#include <io.h>
+#include <fcntl.h>
+#ifndef S_ISDIR
+#define S_ISDIR(x) (((x) & S_IFMT) == S_IFDIR)
+#endif
+#else /* !_WIN32 */
+#include <sys/stat.h>
+#include <sys/socket.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <dirent.h>
+#endif /* _WIN32 */
+#include <signal.h>
+
+#ifdef EVENT__HAVE_SYS_UN_H
+#include <sys/un.h>
+#endif
+#ifdef EVENT__HAVE_AFUNIX_H
+#include <afunix.h>
+#endif
+
+#include <event2/event.h>
+#include <event2/http.h>
+#include <event2/listener.h>
+#include <event2/buffer.h>
+#include <event2/util.h>
+#include <event2/keyvalq_struct.h>
+
+#ifdef _WIN32
+#include <event2/thread.h>
+#endif /* _WIN32 */
+
+#ifdef EVENT__HAVE_NETINET_IN_H
+#include <netinet/in.h>
+# ifdef _XOPEN_SOURCE_EXTENDED
+# include <arpa/inet.h>
+# endif
+#endif
+
+#ifdef _WIN32
+#ifndef stat
+#define stat _stat
+#endif
+#ifndef fstat
+#define fstat _fstat
+#endif
+#ifndef open
+#define open _open
+#endif
+#ifndef close
+#define close _close
+#endif
+#ifndef O_RDONLY
+#define O_RDONLY _O_RDONLY
+#endif
+#endif /* _WIN32 */
+
+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/postscript" },
+ { NULL, NULL },
+};
+
+struct options {
+ int port;
+ int iocp;
+ int verbose;
+
+ int unlink;
+ const char *unixsock;
+ const char *docroot;
+};
+
+/* 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;
+ struct options *o = 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(o->docroot)+2;
+ if (!(whole_path = malloc(len))) {
+ perror("malloc");
+ goto err;
+ }
+ evutil_snprintf(whole_path, len, "%s/%s", o->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,
+ "<!DOCTYPE html>\n"
+ "<html>\n <head>\n"
+ " <meta charset='utf-8'>\n"
+ " <title>%s</title>\n"
+ " <base href='%s%s'>\n"
+ " </head>\n"
+ " <body>\n"
+ " <h1>%s</h1>\n"
+ " <ul>\n",
+ decoded_path, /* XXX html-escape this. */
+ 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
+print_usage(FILE *out, const char *prog, int exit_code)
+{
+ fprintf(out,
+ "Syntax: %s [ OPTS ] <docroot>\n"
+ " -p - port\n"
+ " -U - bind to unix socket\n"
+ " -u - unlink unix socket before bind\n"
+ " -I - IOCP\n"
+ " -v - verbosity, enables libevent debug logging too\n", prog);
+ exit(exit_code);
+}
+static struct options
+parse_opts(int argc, char **argv)
+{
+ struct options o;
+ int opt;
+
+ memset(&o, 0, sizeof(o));
+
+ while ((opt = getopt(argc, argv, "hp:U:uIv")) != -1) {
+ switch (opt) {
+ case 'p': o.port = atoi(optarg); break;
+ case 'U': o.unixsock = optarg; break;
+ case 'u': o.unlink = 1; break;
+ case 'I': o.iocp = 1; break;
+ case 'v': ++o.verbose; break;
+ case 'h': print_usage(stdout, argv[0], 0); break;
+ default : fprintf(stderr, "Unknown option %c\n", opt); break;
+ }
+ }
+
+ if (optind >= argc || (argc - optind) > 1) {
+ print_usage(stdout, argv[0], 1);
+ }
+ o.docroot = argv[optind];
+
+ return o;
+}
+
+static void
+do_term(int sig, short events, void *arg)
+{
+ struct event_base *base = arg;
+ event_base_loopbreak(base);
+ fprintf(stderr, "Got %i, Terminating\n", sig);
+}
+
+static int
+display_listen_sock(struct evhttp_bound_socket *handle)
+{
+ 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;
+ }
+#ifdef EVENT__HAVE_STRUCT_SOCKADDR_UN
+ else if (ss.ss_family == AF_UNIX) {
+ printf("Listening on <%s>\n", ((struct sockaddr_un*)&ss)->sun_path);
+ return 0;
+ }
+#endif
+ 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;
+ }
+
+ return 0;
+}
+
+int
+main(int argc, char **argv)
+{
+ struct event_config *cfg = NULL;
+ struct event_base *base = NULL;
+ struct evhttp *http = NULL;
+ struct evhttp_bound_socket *handle = NULL;
+ struct evconnlistener *lev = NULL;
+ struct event *term = NULL;
+ struct options o = parse_opts(argc, argv);
+ int ret = 0;
+
+#ifdef _WIN32
+ {
+ WORD wVersionRequested;
+ WSADATA wsaData;
+ wVersionRequested = MAKEWORD(2, 2);
+ WSAStartup(wVersionRequested, &wsaData);
+ }
+#else
+ if (signal(SIGPIPE, SIG_IGN) == SIG_ERR) {
+ ret = 1;
+ goto err;
+ }
+#endif
+
+ setbuf(stdout, NULL);
+ setbuf(stderr, NULL);
+
+ /** Read env like in regress */
+ if (o.verbose || getenv("EVENT_DEBUG_LOGGING_ALL"))
+ event_enable_debug_logging(EVENT_DBG_ALL);
+
+ cfg = event_config_new();
+#ifdef _WIN32
+ if (o.iocp) {
+#ifdef EVTHREAD_USE_WINDOWS_THREADS_IMPLEMENTED
+ evthread_use_windows_threads();
+ event_config_set_num_cpus_hint(cfg, 8);
+#endif
+ event_config_set_flag(cfg, EVENT_BASE_FLAG_STARTUP_IOCP);
+ }
+#endif
+
+ base = event_base_new_with_config(cfg);
+ if (!base) {
+ fprintf(stderr, "Couldn't create an event_base: exiting\n");
+ ret = 1;
+ }
+ event_config_free(cfg);
+ cfg = NULL;
+
+ /* Create a new evhttp object to handle requests. */
+ http = evhttp_new(base);
+ if (!http) {
+ fprintf(stderr, "couldn't create evhttp. Exiting.\n");
+ ret = 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, &o);
+
+ if (o.unixsock) {
+#ifdef EVENT__HAVE_STRUCT_SOCKADDR_UN
+ struct sockaddr_un addr;
+
+ if (o.unlink && (unlink(o.unixsock) && errno != ENOENT)) {
+ perror(o.unixsock);
+ ret = 1;
+ goto err;
+ }
+
+ addr.sun_family = AF_UNIX;
+ strcpy(addr.sun_path, o.unixsock);
+
+ lev = evconnlistener_new_bind(base, NULL, NULL,
+ LEV_OPT_CLOSE_ON_FREE, -1,
+ (struct sockaddr *)&addr, sizeof(addr));
+ if (!lev) {
+ perror("Cannot create listener");
+ ret = 1;
+ goto err;
+ }
+
+ handle = evhttp_bind_listener(http, lev);
+ if (!handle) {
+ fprintf(stderr, "couldn't bind to %s. Exiting.\n", o.unixsock);
+ ret = 1;
+ goto err;
+ }
+#else /* !EVENT__HAVE_STRUCT_SOCKADDR_UN */
+ fprintf(stderr, "-U is not supported on this platform. Exiting.\n");
+ ret = 1;
+ goto err;
+#endif /* EVENT__HAVE_STRUCT_SOCKADDR_UN */
+ }
+ else {
+ handle = evhttp_bind_socket_with_handle(http, "0.0.0.0", o.port);
+ if (!handle) {
+ fprintf(stderr, "couldn't bind to port %d. Exiting.\n", o.port);
+ ret = 1;
+ goto err;
+ }
+ }
+
+ if (display_listen_sock(handle)) {
+ ret = 1;
+ goto err;
+ }
+
+ term = evsignal_new(base, SIGINT, do_term, base);
+ if (!term)
+ goto err;
+ if (event_add(term, NULL))
+ goto err;
+
+ event_base_dispatch(base);
+
+#ifdef _WIN32
+ WSACleanup();
+#endif
+
+err:
+ if (cfg)
+ event_config_free(cfg);
+ if (http)
+ evhttp_free(http);
+ if (term)
+ event_free(term);
+ if (base)
+ event_base_free(base);
+
+ return ret;
+}
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