bail out on unsupported Expect: headers

[project/uhttpd.git] / client.c

diff --git a/client.c b/client.c
index a76d11e..8604034 100644 (file)
--- a/client.c
+++ b/client.c
@@ -134,6 +134,7 @@ static int client_parse_request(struct client *cl, char *data)
 {
        struct http_request *req = &cl->request;
        char *type, *path, *version;
+       int h_method, h_version;
 
        type = strtok(data, " ");
        path = strtok(NULL, " ");
@@ -141,14 +142,18 @@ static int client_parse_request(struct client *cl, char *data)
        if (!type || !path || !version)
                return CLIENT_STATE_DONE;
 
+       memset(&cl->request, 0, sizeof(cl->request));
        req->url = path;
-       req->method = find_idx(http_methods, ARRAY_SIZE(http_methods), type);
-       if (req->method < 0)
-               return CLIENT_STATE_DONE;
 
-       req->version = find_idx(http_versions, ARRAY_SIZE(http_versions), version);
-       if (cl->request.version < 0)
+       h_method = find_idx(http_methods, ARRAY_SIZE(http_methods), type);
+       h_version = find_idx(http_versions, ARRAY_SIZE(http_versions), version);
+       if (h_method < 0 || h_version < 0) {
+               req->version = UH_HTTP_VER_1_0;
                return CLIENT_STATE_DONE;
+       }
+
+       req->method = h_method;
+       req->version = h_version;
 
        return CLIENT_STATE_HEADER;
 }
@@ -172,8 +177,28 @@ static bool client_init_cb(struct client *cl, char *buf, int len)
        return true;
 }
 
+static bool rfc1918_filter_check(struct client *cl)
+{
+       if (!conf.rfc1918_filter)
+               return true;
+
+       if (!uh_addr_rfc1918(&cl->peer_addr) || uh_addr_rfc1918(&cl->srv_addr))
+               return true;
+
+       uh_client_error(cl, 403, "Forbidden",
+                       "Rejected request from RFC1918 IP "
+                       "to public server address");
+       return false;
+}
+
 static void client_header_complete(struct client *cl)
 {
+       if (!rfc1918_filter_check(cl))
+               return;
+
+       if (cl->request.expect_cont)
+               ustream_printf(cl->us, "HTTP/1.1 100 Continue\r\n\r\n");
+
        uh_handle_request(cl);
 }
 
@@ -199,6 +224,16 @@ static void client_parse_header(struct client *cl, char *data)
                if (isupper(*name))
                        *name = tolower(*name);
 
+       if (!strcasecmp(data, "Expect")) {
+               if (!strcasecmp(val, "100-continue"))
+                       cl->request.expect_cont = true;
+               else {
+                       uh_header_error(cl, 400, "Bad Request");
+                       return;
+               }
+       }
+
+
        blobmsg_add_string(&cl->hdr, data, val);
 
        cl->state = CLIENT_STATE_HEADER;
@@ -300,6 +335,21 @@ static void client_notify_state(struct ustream *s)
        return client_close(cl);
 }
 
+static void set_addr(struct uh_addr *addr, void *src)
+{
+       struct sockaddr_in *sin = src;
+       struct sockaddr_in6 *sin6 = src;
+
+       addr->family = sin->sin_family;
+       if (addr->family == AF_INET) {
+               addr->port = ntohs(sin->sin_port);
+               memcpy(&addr->in, &sin->sin_addr, sizeof(addr->in));
+       } else {
+               addr->port = ntohs(sin6->sin6_port);
+               memcpy(&addr->in6, &sin6->sin6_addr, sizeof(addr->in6));
+       }
+}
+
 void uh_accept_client(int fd)
 {
        static struct client *next_client;
@@ -307,19 +357,22 @@ void uh_accept_client(int fd)
        unsigned int sl;
        int sfd;
        static int client_id = 0;
+       struct sockaddr_in6 addr;
 
        if (!next_client)
                next_client = calloc(1, sizeof(*next_client));
 
        cl = next_client;
 
-       sl = sizeof(cl->peeraddr);
-       sfd = accept(fd, (struct sockaddr *) &cl->peeraddr, &sl);
+       sl = sizeof(addr);
+       sfd = accept(fd, (struct sockaddr *) &addr, &sl);
        if (sfd < 0)
                return;
 
-       sl = sizeof(cl->servaddr);
-       getsockname(fd, (struct sockaddr *) &cl->servaddr, &sl);
+       set_addr(&cl->peer_addr, &addr);
+       sl = sizeof(addr);
+       getsockname(fd, (struct sockaddr *) &addr, &sl);
+       set_addr(&cl->srv_addr, &addr);
        cl->us = &cl->sfd.stream;
        cl->us->string_data = true;
        cl->us->notify_read = client_ustream_read_cb;