419 lines
10 KiB
C
419 lines
10 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 <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
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#include <sys/stat.h>
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#include <sys/socket.h>
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#include <signal.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
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#include <event2/event.h>
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#include <event2/http.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 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
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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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/* 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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const char *docroot = 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(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", 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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syntax(void)
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{
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fprintf(stdout, "Syntax: http-server <docroot>\n");
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}
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int
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main(int argc, char **argv)
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{
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struct event_base *base;
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struct evhttp *http;
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struct evhttp_bound_socket *handle;
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ev_uint16_t port = 0;
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#ifdef _WIN32
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WSADATA WSAData;
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WSAStartup(0x101, &WSAData);
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#else
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if (signal(SIGPIPE, SIG_IGN) == SIG_ERR)
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return (1);
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#endif
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if (argc < 2) {
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syntax();
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return 1;
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}
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base = event_base_new();
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if (!base) {
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fprintf(stderr, "Couldn't create an event_base: exiting\n");
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return 1;
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}
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/* Create a new evhttp object to handle requests. */
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http = evhttp_new(base);
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if (!http) {
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fprintf(stderr, "couldn't create evhttp. Exiting.\n");
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return 1;
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}
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/* The /dump URI will dump all requests to stdout and say 200 ok. */
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evhttp_set_cb(http, "/dump", dump_request_cb, NULL);
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/* We want to accept arbitrary requests, so we need to set a "generic"
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* cb. We can also add callbacks for specific paths. */
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evhttp_set_gencb(http, send_document_cb, argv[1]);
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/* Now we tell the evhttp what port to listen on */
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handle = evhttp_bind_socket_with_handle(http, "0.0.0.0", port);
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if (!handle) {
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fprintf(stderr, "couldn't bind to port %d. Exiting.\n",
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(int)port);
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return 1;
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}
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{
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/* Extract and display the address we're listening on. */
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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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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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}
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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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} else {
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fprintf(stderr, "Weird address family %d\n",
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ss.ss_family);
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return 1;
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}
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addr = evutil_inet_ntop(ss.ss_family, inaddr, addrbuf,
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sizeof(addrbuf));
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if (addr) {
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printf("Listening on %s:%d\n", addr, got_port);
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evutil_snprintf(uri_root, sizeof(uri_root),
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"http://%s:%d",addr,got_port);
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} else {
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fprintf(stderr, "evutil_inet_ntop failed\n");
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return 1;
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}
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}
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event_base_dispatch(base);
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return 0;
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}
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