583 lines
13 KiB
C
583 lines
13 KiB
C
/*
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A trivial static http webserver using Libevent's evhttp.
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This is not the best code in the world, and it does some fairly stupid stuff
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that you would never want to do in a production webserver. Caveat hackor!
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*/
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/* Compatibility for possible missing IPv6 declarations */
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#include "../util-internal.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#ifdef _WIN32
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#include <winsock2.h>
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#include <ws2tcpip.h>
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#include <windows.h>
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#include <getopt.h>
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#include <io.h>
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#include <fcntl.h>
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#ifndef S_ISDIR
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#define S_ISDIR(x) (((x) & S_IFMT) == S_IFDIR)
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#endif
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#else /* !_WIN32 */
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#include <sys/stat.h>
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#include <sys/socket.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <dirent.h>
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#endif /* _WIN32 */
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#include <signal.h>
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#ifdef EVENT__HAVE_SYS_UN_H
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#include <sys/un.h>
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#endif
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#ifdef EVENT__HAVE_AFUNIX_H
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#include <afunix.h>
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#endif
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#include <event2/event.h>
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#include <event2/http.h>
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#include <event2/listener.h>
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#include <event2/buffer.h>
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#include <event2/util.h>
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#include <event2/keyvalq_struct.h>
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#ifdef _WIN32
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#include <event2/thread.h>
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#endif /* _WIN32 */
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#ifdef EVENT__HAVE_NETINET_IN_H
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#include <netinet/in.h>
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# ifdef _XOPEN_SOURCE_EXTENDED
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# include <arpa/inet.h>
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# endif
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#endif
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#ifdef _WIN32
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#ifndef stat
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#define stat _stat
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#endif
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#ifndef fstat
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#define fstat _fstat
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#endif
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#ifndef open
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#define open _open
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#endif
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#ifndef close
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#define close _close
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#endif
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#ifndef O_RDONLY
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#define O_RDONLY _O_RDONLY
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#endif
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#endif /* _WIN32 */
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char uri_root[512];
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static const struct table_entry {
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const char *extension;
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const char *content_type;
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} content_type_table[] = {
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{ "txt", "text/plain" },
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{ "c", "text/plain" },
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{ "h", "text/plain" },
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{ "html", "text/html" },
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{ "htm", "text/htm" },
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{ "css", "text/css" },
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{ "gif", "image/gif" },
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{ "jpg", "image/jpeg" },
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{ "jpeg", "image/jpeg" },
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{ "png", "image/png" },
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{ "pdf", "application/pdf" },
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{ "ps", "application/postscript" },
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{ NULL, NULL },
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};
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struct options {
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int port;
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int iocp;
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int verbose;
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int unlink;
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const char *unixsock;
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const char *docroot;
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};
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/* Try to guess a good content-type for 'path' */
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static const char *
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guess_content_type(const char *path)
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{
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const char *last_period, *extension;
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const struct table_entry *ent;
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last_period = strrchr(path, '.');
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if (!last_period || strchr(last_period, '/'))
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goto not_found; /* no exension */
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extension = last_period + 1;
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for (ent = &content_type_table[0]; ent->extension; ++ent) {
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if (!evutil_ascii_strcasecmp(ent->extension, extension))
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return ent->content_type;
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}
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not_found:
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return "application/misc";
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}
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/* Callback used for the /dump URI, and for every non-GET request:
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* dumps all information to stdout and gives back a trivial 200 ok */
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static void
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dump_request_cb(struct evhttp_request *req, void *arg)
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{
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const char *cmdtype;
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struct evkeyvalq *headers;
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struct evkeyval *header;
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struct evbuffer *buf;
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switch (evhttp_request_get_command(req)) {
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case EVHTTP_REQ_GET: cmdtype = "GET"; break;
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case EVHTTP_REQ_POST: cmdtype = "POST"; break;
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case EVHTTP_REQ_HEAD: cmdtype = "HEAD"; break;
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case EVHTTP_REQ_PUT: cmdtype = "PUT"; break;
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case EVHTTP_REQ_DELETE: cmdtype = "DELETE"; break;
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case EVHTTP_REQ_OPTIONS: cmdtype = "OPTIONS"; break;
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case EVHTTP_REQ_TRACE: cmdtype = "TRACE"; break;
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case EVHTTP_REQ_CONNECT: cmdtype = "CONNECT"; break;
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case EVHTTP_REQ_PATCH: cmdtype = "PATCH"; break;
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default: cmdtype = "unknown"; break;
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}
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printf("Received a %s request for %s\nHeaders:\n",
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cmdtype, evhttp_request_get_uri(req));
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headers = evhttp_request_get_input_headers(req);
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for (header = headers->tqh_first; header;
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header = header->next.tqe_next) {
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printf(" %s: %s\n", header->key, header->value);
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}
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buf = evhttp_request_get_input_buffer(req);
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puts("Input data: <<<");
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while (evbuffer_get_length(buf)) {
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int n;
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char cbuf[128];
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n = evbuffer_remove(buf, cbuf, sizeof(cbuf));
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if (n > 0)
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(void) fwrite(cbuf, 1, n, stdout);
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}
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puts(">>>");
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evhttp_send_reply(req, 200, "OK", NULL);
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}
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/* This callback gets invoked when we get any http request that doesn't match
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* any other callback. Like any evhttp server callback, it has a simple job:
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* it must eventually call evhttp_send_error() or evhttp_send_reply().
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*/
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static void
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send_document_cb(struct evhttp_request *req, void *arg)
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{
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struct evbuffer *evb = NULL;
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struct options *o = arg;
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const char *uri = evhttp_request_get_uri(req);
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struct evhttp_uri *decoded = NULL;
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const char *path;
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char *decoded_path;
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char *whole_path = NULL;
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size_t len;
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int fd = -1;
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struct stat st;
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if (evhttp_request_get_command(req) != EVHTTP_REQ_GET) {
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dump_request_cb(req, arg);
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return;
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}
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printf("Got a GET request for <%s>\n", uri);
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/* Decode the URI */
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decoded = evhttp_uri_parse(uri);
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if (!decoded) {
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printf("It's not a good URI. Sending BADREQUEST\n");
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evhttp_send_error(req, HTTP_BADREQUEST, 0);
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return;
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}
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/* Let's see what path the user asked for. */
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path = evhttp_uri_get_path(decoded);
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if (!path) path = "/";
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/* We need to decode it, to see what path the user really wanted. */
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decoded_path = evhttp_uridecode(path, 0, NULL);
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if (decoded_path == NULL)
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goto err;
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/* Don't allow any ".."s in the path, to avoid exposing stuff outside
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* of the docroot. This test is both overzealous and underzealous:
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* it forbids aceptable paths like "/this/one..here", but it doesn't
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* do anything to prevent symlink following." */
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if (strstr(decoded_path, ".."))
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goto err;
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len = strlen(decoded_path)+strlen(o->docroot)+2;
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if (!(whole_path = malloc(len))) {
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perror("malloc");
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goto err;
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}
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evutil_snprintf(whole_path, len, "%s/%s", o->docroot, decoded_path);
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if (stat(whole_path, &st)<0) {
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goto err;
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}
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/* This holds the content we're sending. */
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evb = evbuffer_new();
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if (S_ISDIR(st.st_mode)) {
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/* If it's a directory, read the comments and make a little
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* index page */
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#ifdef _WIN32
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HANDLE d;
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WIN32_FIND_DATAA ent;
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char *pattern;
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size_t dirlen;
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#else
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DIR *d;
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struct dirent *ent;
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#endif
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const char *trailing_slash = "";
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if (!strlen(path) || path[strlen(path)-1] != '/')
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trailing_slash = "/";
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#ifdef _WIN32
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dirlen = strlen(whole_path);
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pattern = malloc(dirlen+3);
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memcpy(pattern, whole_path, dirlen);
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pattern[dirlen] = '\\';
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pattern[dirlen+1] = '*';
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pattern[dirlen+2] = '\0';
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d = FindFirstFileA(pattern, &ent);
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free(pattern);
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if (d == INVALID_HANDLE_VALUE)
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goto err;
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#else
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if (!(d = opendir(whole_path)))
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goto err;
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#endif
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evbuffer_add_printf(evb,
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"<!DOCTYPE html>\n"
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"<html>\n <head>\n"
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" <meta charset='utf-8'>\n"
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" <title>%s</title>\n"
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" <base href='%s%s'>\n"
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" </head>\n"
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" <body>\n"
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" <h1>%s</h1>\n"
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" <ul>\n",
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decoded_path, /* XXX html-escape this. */
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path, /* XXX html-escape this? */
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trailing_slash,
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decoded_path /* XXX html-escape this */);
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#ifdef _WIN32
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do {
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const char *name = ent.cFileName;
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#else
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while ((ent = readdir(d))) {
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const char *name = ent->d_name;
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#endif
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evbuffer_add_printf(evb,
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" <li><a href=\"%s\">%s</a>\n",
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name, name);/* XXX escape this */
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#ifdef _WIN32
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} while (FindNextFileA(d, &ent));
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#else
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}
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#endif
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evbuffer_add_printf(evb, "</ul></body></html>\n");
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#ifdef _WIN32
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FindClose(d);
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#else
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closedir(d);
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#endif
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evhttp_add_header(evhttp_request_get_output_headers(req),
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"Content-Type", "text/html");
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} else {
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/* Otherwise it's a file; add it to the buffer to get
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* sent via sendfile */
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const char *type = guess_content_type(decoded_path);
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if ((fd = open(whole_path, O_RDONLY)) < 0) {
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perror("open");
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goto err;
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}
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if (fstat(fd, &st)<0) {
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/* Make sure the length still matches, now that we
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* opened the file :/ */
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perror("fstat");
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goto err;
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}
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evhttp_add_header(evhttp_request_get_output_headers(req),
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"Content-Type", type);
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evbuffer_add_file(evb, fd, 0, st.st_size);
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}
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evhttp_send_reply(req, 200, "OK", evb);
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goto done;
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err:
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evhttp_send_error(req, 404, "Document was not found");
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if (fd>=0)
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close(fd);
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done:
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if (decoded)
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evhttp_uri_free(decoded);
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if (decoded_path)
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free(decoded_path);
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if (whole_path)
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free(whole_path);
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if (evb)
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evbuffer_free(evb);
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}
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static void
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print_usage(FILE *out, const char *prog, int exit_code)
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{
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fprintf(out,
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"Syntax: %s [ OPTS ] <docroot>\n"
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" -p - port\n"
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" -U - bind to unix socket\n"
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" -u - unlink unix socket before bind\n"
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" -I - IOCP\n"
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" -v - verbosity, enables libevent debug logging too\n", prog);
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exit(exit_code);
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}
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static struct options
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parse_opts(int argc, char **argv)
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{
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struct options o;
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int opt;
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memset(&o, 0, sizeof(o));
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|
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while ((opt = getopt(argc, argv, "hp:U:uIv")) != -1) {
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switch (opt) {
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case 'p': o.port = atoi(optarg); break;
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case 'U': o.unixsock = optarg; break;
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case 'u': o.unlink = 1; break;
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case 'I': o.iocp = 1; break;
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case 'v': ++o.verbose; break;
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case 'h': print_usage(stdout, argv[0], 0); break;
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default : fprintf(stderr, "Unknown option %c\n", opt); break;
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}
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|
}
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|
|
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if (optind >= argc || (argc - optind) > 1) {
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print_usage(stdout, argv[0], 1);
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}
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o.docroot = argv[optind];
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|
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return o;
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|
}
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|
|
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static void
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do_term(int sig, short events, void *arg)
|
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{
|
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struct event_base *base = arg;
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event_base_loopbreak(base);
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fprintf(stderr, "Got %i, Terminating\n", sig);
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}
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|
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static int
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display_listen_sock(struct evhttp_bound_socket *handle)
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{
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|
struct sockaddr_storage ss;
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evutil_socket_t fd;
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ev_socklen_t socklen = sizeof(ss);
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char addrbuf[128];
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void *inaddr;
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const char *addr;
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int got_port = -1;
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|
|
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fd = evhttp_bound_socket_get_fd(handle);
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memset(&ss, 0, sizeof(ss));
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if (getsockname(fd, (struct sockaddr *)&ss, &socklen)) {
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perror("getsockname() failed");
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return 1;
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|
}
|
|
|
|
if (ss.ss_family == AF_INET) {
|
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got_port = ntohs(((struct sockaddr_in*)&ss)->sin_port);
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inaddr = &((struct sockaddr_in*)&ss)->sin_addr;
|
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} else if (ss.ss_family == AF_INET6) {
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got_port = ntohs(((struct sockaddr_in6*)&ss)->sin6_port);
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inaddr = &((struct sockaddr_in6*)&ss)->sin6_addr;
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}
|
|
#ifdef EVENT__HAVE_STRUCT_SOCKADDR_UN
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|
else if (ss.ss_family == AF_UNIX) {
|
|
printf("Listening on <%s>\n", ((struct sockaddr_un*)&ss)->sun_path);
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|
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;
|
|
}
|