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Diffstat (limited to '')
-rw-r--r-- | third_party/heimdal/lib/roken/mini_inetd.c | 197 |
1 files changed, 197 insertions, 0 deletions
diff --git a/third_party/heimdal/lib/roken/mini_inetd.c b/third_party/heimdal/lib/roken/mini_inetd.c new file mode 100644 index 0000000..a9398f4 --- /dev/null +++ b/third_party/heimdal/lib/roken/mini_inetd.c @@ -0,0 +1,197 @@ +/* + * Copyright (c) 1995 - 2001 Kungliga Tekniska Högskolan + * (Royal Institute of Technology, Stockholm, Sweden). + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * 3. Neither the name of the Institute nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include <config.h> + +#include <err.h> +#include "roken.h" + +/* + * accept a connection on `s' and pretend it's served by inetd. + */ + +static void +accept_it (rk_socket_t s, rk_socket_t *ret_socket) +{ + rk_socket_t as; + + as = accept(s, NULL, NULL); + if(rk_IS_BAD_SOCKET(as)) + err (1, "accept"); + + if (ret_socket) { + + *ret_socket = as; + + } else { + int fd = socket_to_fd(as, 0); + + /* We would use _O_RDONLY for the socket_to_fd() call for + STDIN, but there are instances where we assume that STDIN + is a r/w socket. */ + + dup2(fd, STDIN_FILENO); + dup2(fd, STDOUT_FILENO); + + rk_closesocket(as); + } +} + +/** + * Listen on a specified addresses + * + * Listens on the specified addresses for incoming connections. If + * the \a ret_socket parameter is \a NULL, on return STDIN and STDOUT + * will be connected to an accepted socket. If the \a ret_socket + * parameter is non-NULL, the accepted socket will be returned in + * *ret_socket. In the latter case, STDIN and STDOUT will be left + * unmodified. + * + * This function does not return if there is an error or if no + * connection is established. + * + * @param[in] ai Addresses to listen on + * @param[out] ret_socket If non-NULL receives the accepted socket. + * + * @see mini_inetd() + */ +ROKEN_LIB_FUNCTION void ROKEN_LIB_CALL +mini_inetd_addrinfo (struct addrinfo *ai, rk_socket_t *ret_socket) +{ + int ret; + struct addrinfo *a; + int n, nalloc, i; + rk_socket_t *fds; + fd_set orig_read_set, read_set; + rk_socket_t max_fd = (rk_socket_t)-1; + + for (nalloc = 0, a = ai; a != NULL; a = a->ai_next) + ++nalloc; + + fds = malloc (nalloc * sizeof(*fds)); + if (fds == NULL) { + errx (1, "mini_inetd: out of memory"); + UNREACHABLE(return); + } + + FD_ZERO(&orig_read_set); + + for (i = 0, a = ai; a != NULL; a = a->ai_next) { + fds[i] = socket (a->ai_family, a->ai_socktype, a->ai_protocol); + if (rk_IS_BAD_SOCKET(fds[i])) + continue; + socket_set_reuseaddr (fds[i], 1); + socket_set_ipv6only(fds[i], 1); + if (rk_IS_SOCKET_ERROR(bind (fds[i], a->ai_addr, a->ai_addrlen))) { + warn ("bind af = %d", a->ai_family); + rk_closesocket(fds[i]); + fds[i] = rk_INVALID_SOCKET; + continue; + } + if (rk_IS_SOCKET_ERROR(listen (fds[i], SOMAXCONN))) { + warn ("listen af = %d", a->ai_family); + rk_closesocket(fds[i]); + fds[i] = rk_INVALID_SOCKET; + continue; + } +#ifndef NO_LIMIT_FD_SETSIZE + if (fds[i] >= FD_SETSIZE) + errx (1, "fd too large"); +#endif + FD_SET(fds[i], &orig_read_set); + max_fd = max(max_fd, fds[i]); + ++i; + } + if (i == 0) + errx (1, "no sockets"); + n = i; + + do { + read_set = orig_read_set; + + ret = select (max_fd + 1, &read_set, NULL, NULL, NULL); + if (rk_IS_SOCKET_ERROR(ret) && rk_SOCK_ERRNO != EINTR) + err (1, "select"); + } while (ret <= 0); + + for (i = 0; i < n; ++i) + if (FD_ISSET (fds[i], &read_set)) { + accept_it (fds[i], ret_socket); + for (i = 0; i < n; ++i) + rk_closesocket(fds[i]); + free(fds); + return; + } + abort (); +} + +/** + * Listen on a specified port + * + * Listens on the specified port for incoming connections. If the \a + * ret_socket parameter is \a NULL, on return STDIN and STDOUT will be + * connected to an accepted socket. If the \a ret_socket parameter is + * non-NULL, the accepted socket will be returned in *ret_socket. In + * the latter case, STDIN and STDOUT will be left unmodified. + * + * This function does not return if there is an error or if no + * connection is established. + * + * @param[in] port Port to listen on + * @param[out] ret_socket If non-NULL receives the accepted socket. + * + * @see mini_inetd_addrinfo() + */ +ROKEN_LIB_FUNCTION void ROKEN_LIB_CALL +mini_inetd(int port, rk_socket_t * ret_socket) +{ + int error; + struct addrinfo *ai, hints; + char portstr[NI_MAXSERV]; + + memset (&hints, 0, sizeof(hints)); + hints.ai_flags = AI_PASSIVE; + hints.ai_socktype = SOCK_STREAM; + hints.ai_family = PF_UNSPEC; + + snprintf (portstr, sizeof(portstr), "%d", ntohs(port)); + + error = getaddrinfo (NULL, portstr, &hints, &ai); + if (error) + errx (1, "getaddrinfo: %s", gai_strerror (error)); + + mini_inetd_addrinfo(ai, ret_socket); + + freeaddrinfo(ai); +} + |