commit - d3a08f4d172687d4e3e60e7faaa8830bb7f9f9db
commit + c0224a266cba8707da8f8826dac8ff1edb38306a
blob - b25aa5d7e844d05820da24098072ea9ab419f316 (mode 644)
blob + /dev/null
--- cgi.c
+++ /dev/null
-/*
- * Copyright (c) 2021 Omar Polo <op@omarpolo.com>
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
- */
-
-#include <netdb.h>
-
-#include <err.h>
-#include <errno.h>
-#include <string.h>
-
-#include "gmid.h"
-
-/*
- * the inverse of this algorithm, i.e. starting from the start of the
- * path + strlen(cgi), and checking if each component, should be
- * faster. But it's tedious to write. This does the opposite: starts
- * from the end and strip one component at a time, until either an
- * executable is found or we emptied the path.
- */
-int
-check_for_cgi(char *path, char *query, struct pollfd *fds, struct client *c)
-{
- char *end;
- end = strchr(path, '\0');
-
- /* NB: assume CGI is enabled and path matches cgi */
-
- while (end > path) {
- /* go up one level. UNIX paths are simple and POSIX
- * dirname, with its ambiguities on if the given path
- * is changed or not, gives me headaches. */
- while (*end != '/')
- end--;
- *end = '\0';
-
- switch (check_path(c, path, &c->fd)) {
- case FILE_EXECUTABLE:
- return start_cgi(path, end+1, query, fds,c);
- case FILE_MISSING:
- break;
- default:
- goto err;
- }
-
- *end = '/';
- end--;
- }
-
-err:
- if (!start_reply(fds, c, NOT_FOUND, "not found"))
- return 0;
- goodbye(fds, c);
- return 0;
-}
-
-int
-start_cgi(const char *spath, const char *relpath, const char *query,
- struct pollfd *fds, struct client *c)
-{
- char addr[NI_MAXHOST];
- const char *ruser, *cissuer, *chash;
- int e;
-
- e = getnameinfo((struct sockaddr*)&c->addr, sizeof(c->addr),
- addr, sizeof(addr),
- NULL, 0,
- NI_NUMERICHOST);
- if (e != 0)
- goto err;
-
- if (tls_peer_cert_provided(c->ctx)) {
- ruser = tls_peer_cert_subject(c->ctx);
- cissuer = tls_peer_cert_issuer(c->ctx);
- chash = tls_peer_cert_hash(c->ctx);
- } else {
- ruser = NULL;
- cissuer = NULL;
- chash = NULL;
- }
-
- if (!send_string(exfd, spath)
- || !send_string(exfd, relpath)
- || !send_string(exfd, query)
- || !send_string(exfd, addr)
- || !send_string(exfd, ruser)
- || !send_string(exfd, cissuer)
- || !send_string(exfd, chash)
- || !send_vhost(exfd, c->host))
- goto err;
-
- close(c->fd);
- if ((c->fd = recv_fd(exfd)) == -1) {
- if (!start_reply(fds, c, TEMP_FAILURE, "internal server error"))
- return 0;
- goodbye(fds, c);
- return 0;
- }
- c->child = 1;
- c->state = S_SENDING;
- cgi_poll_on_child(fds, c);
- /* handle_cgi(fds, c); */
- return 0;
-
-err:
- /* fatal("cannot talk to the executor process: %s", strerror(errno)); */
- err(1, "cannot talk to the executor process");
-}
-
-void
-cgi_poll_on_child(struct pollfd *fds, struct client *c)
-{
- int fd;
-
- if (c->waiting_on_child)
- return;
- c->waiting_on_child = 1;
-
- fds->events = POLLIN;
-
- fd = fds->fd;
- fds->fd = c->fd;
- c->fd = fd;
-}
-
-void
-cgi_poll_on_client(struct pollfd *fds, struct client *c)
-{
- int fd;
-
- if (!c->waiting_on_child)
- return;
- c->waiting_on_child = 0;
-
- fd = fds->fd;
- fds->fd = c->fd;
- c->fd = fd;
-}
-
-void
-handle_cgi(struct pollfd *fds, struct client *c)
-{
- ssize_t r;
-
- /* ensure c->fd is the child and fds->fd the client */
- cgi_poll_on_client(fds, c);
-
- while (1) {
- if (c->len == 0) {
- if ((r = read(c->fd, c->sbuf, sizeof(c->sbuf))) == 0)
- goto end;
- if (r == -1) {
- if (errno == EAGAIN || errno == EWOULDBLOCK) {
- cgi_poll_on_child(fds, c);
- return;
- }
- goto end;
- }
- c->len = r;
- c->off = 0;
- }
-
- while (c->len > 0) {
- switch (r = tls_write(c->ctx, c->sbuf + c->off, c->len)) {
- case -1:
- goto end;
-
- case TLS_WANT_POLLOUT:
- fds->events = POLLOUT;
- return;
-
- case TLS_WANT_POLLIN:
- fds->events = POLLIN;
- return;
-
- default:
- c->off += r;
- c->len -= r;
- break;
- }
- }
- }
-
-end:
- goodbye(fds, c);
-}
