282 lines
7.5 KiB
C
282 lines
7.5 KiB
C
/*-
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* Copyright (c) 1997 Brian Somers <brian@Awfulhak.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $Id: server.c,v 1.21 1998/06/24 19:33:36 brian Exp $
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*/
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <sys/un.h>
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#include <errno.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <termios.h>
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#include <unistd.h>
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#include "log.h"
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#include "descriptor.h"
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#include "server.h"
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#include "id.h"
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#include "prompt.h"
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static int
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server_UpdateSet(struct descriptor *d, fd_set *r, fd_set *w, fd_set *e, int *n)
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{
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struct server *s = descriptor2server(d);
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struct prompt *p;
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int sets;
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sets = 0;
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if (r && s->fd >= 0) {
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if (*n < s->fd + 1)
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*n = s->fd + 1;
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FD_SET(s->fd, r);
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log_Printf(LogTIMER, "server: fdset(r) %d\n", s->fd);
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sets++;
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}
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for (p = log_PromptList(); p; p = p->next)
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sets += descriptor_UpdateSet(&p->desc, r, w, e, n);
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return sets;
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}
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static int
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server_IsSet(struct descriptor *d, const fd_set *fdset)
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{
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struct server *s = descriptor2server(d);
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struct prompt *p;
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if (s->fd >= 0 && FD_ISSET(s->fd, fdset))
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return 1;
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for (p = log_PromptList(); p; p = p->next)
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if (descriptor_IsSet(&p->desc, fdset))
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return 1;
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return 0;
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}
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#define IN_SIZE sizeof(struct sockaddr_in)
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#define UN_SIZE sizeof(struct sockaddr_in)
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#define ADDRSZ (IN_SIZE > UN_SIZE ? IN_SIZE : UN_SIZE)
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static void
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server_Read(struct descriptor *d, struct bundle *bundle, const fd_set *fdset)
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{
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struct server *s = descriptor2server(d);
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char hisaddr[ADDRSZ];
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struct sockaddr *sa = (struct sockaddr *)hisaddr;
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struct sockaddr_in *in = (struct sockaddr_in *)hisaddr;
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int ssize = ADDRSZ, wfd;
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struct prompt *p;
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if (s->fd >= 0 && FD_ISSET(s->fd, fdset)) {
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wfd = accept(s->fd, sa, &ssize);
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if (wfd < 0)
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log_Printf(LogERROR, "server_Read: accept(): %s\n", strerror(errno));
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} else
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wfd = -1;
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if (wfd >= 0)
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switch (sa->sa_family) {
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case AF_LOCAL:
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log_Printf(LogPHASE, "Connected to local client.\n");
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break;
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case AF_INET:
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if (ntohs(in->sin_port) < 1024) {
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log_Printf(LogALERT, "Rejected client connection from %s:%u"
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"(invalid port number) !\n",
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inet_ntoa(in->sin_addr), ntohs(in->sin_port));
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close(wfd);
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wfd = -1;
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break;
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}
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log_Printf(LogPHASE, "Connected to client from %s:%u\n",
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inet_ntoa(in->sin_addr), in->sin_port);
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break;
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default:
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write(wfd, "Unrecognised access !\n", 22);
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close(wfd);
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wfd = -1;
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break;
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}
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if (wfd >= 0) {
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if ((p = prompt_Create(s, bundle, wfd)) == NULL) {
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write(wfd, "Connection refused.\n", 20);
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close(wfd);
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} else {
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switch (sa->sa_family) {
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case AF_LOCAL:
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p->src.type = "local";
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strncpy(p->src.from, s->rm, sizeof p->src.from - 1);
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p->src.from[sizeof p->src.from - 1] = '\0';
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break;
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case AF_INET:
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p->src.type = "tcp";
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snprintf(p->src.from, sizeof p->src.from, "%s:%u",
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inet_ntoa(in->sin_addr), in->sin_port);
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break;
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}
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prompt_TtyCommandMode(p);
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prompt_Required(p);
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}
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}
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for (p = log_PromptList(); p; p = p->next)
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if (descriptor_IsSet(&p->desc, fdset))
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descriptor_Read(&p->desc, bundle, fdset);
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}
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static int
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server_Write(struct descriptor *d, struct bundle *bundle, const fd_set *fdset)
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{
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/* We never want to write here ! */
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log_Printf(LogALERT, "server_Write: Internal error: Bad call !\n");
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return 0;
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}
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struct server server = {
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{
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SERVER_DESCRIPTOR,
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server_UpdateSet,
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server_IsSet,
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server_Read,
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server_Write
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},
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-1
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};
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int
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server_LocalOpen(struct bundle *bundle, const char *name, mode_t mask)
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{
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int s;
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if (server.rm && !strcmp(server.rm, name)) {
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if (chmod(server.rm, mask))
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log_Printf(LogERROR, "Local: chmod: %s\n", strerror(errno));
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return 0;
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}
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memset(&server.ifsun, '\0', sizeof server.ifsun);
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server.ifsun.sun_len = strlen(name);
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if (server.ifsun.sun_len > sizeof server.ifsun.sun_path - 1) {
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log_Printf(LogERROR, "Local: %s: Path too long\n", name);
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return 2;
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}
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server.ifsun.sun_family = AF_LOCAL;
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strcpy(server.ifsun.sun_path, name);
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s = ID0socket(PF_LOCAL, SOCK_STREAM, 0);
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if (s < 0) {
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log_Printf(LogERROR, "Local: socket: %s\n", strerror(errno));
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return 3;
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}
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setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &s, sizeof s);
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if (mask != (mode_t)-1)
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mask = umask(mask);
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if (bind(s, (struct sockaddr *)&server.ifsun, sizeof server.ifsun) < 0) {
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if (mask != (mode_t)-1)
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umask(mask);
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log_Printf(LogWARN, "Local: bind: %s\n", strerror(errno));
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close(s);
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return 4;
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}
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if (mask != (mode_t)-1)
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umask(mask);
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if (listen(s, 5) != 0) {
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log_Printf(LogERROR, "Local: Unable to listen to socket - BUNDLE overload?\n");
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close(s);
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ID0unlink(name);
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return 5;
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}
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server_Close(bundle);
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server.fd = s;
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server.rm = server.ifsun.sun_path;
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log_Printf(LogPHASE, "Listening at local socket %s.\n", name);
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return 0;
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}
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int
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server_TcpOpen(struct bundle *bundle, int port)
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{
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struct sockaddr_in ifsin;
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int s;
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if (server.port == port)
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return 0;
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s = ID0socket(PF_INET, SOCK_STREAM, 0);
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if (s < 0) {
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log_Printf(LogERROR, "Tcp: socket: %s\n", strerror(errno));
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return 7;
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}
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memset(&ifsin, '\0', sizeof ifsin);
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ifsin.sin_family = AF_INET;
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ifsin.sin_addr.s_addr = INADDR_ANY;
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ifsin.sin_port = htons(port);
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setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &s, sizeof s);
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if (bind(s, (struct sockaddr *)&ifsin, sizeof ifsin) < 0) {
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log_Printf(LogWARN, "Tcp: bind: %s\n", strerror(errno));
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close(s);
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return 8;
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}
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if (listen(s, 5) != 0) {
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log_Printf(LogERROR, "Tcp: Unable to listen to socket - BUNDLE overload?\n");
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close(s);
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return 9;
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}
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server_Close(bundle);
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server.fd = s;
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server.port = port;
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log_Printf(LogPHASE, "Listening at port %d.\n", port);
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return 0;
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}
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int
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server_Close(struct bundle *bundle)
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{
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if (server.fd >= 0) {
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close(server.fd);
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if (server.rm) {
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ID0unlink(server.rm);
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server.rm = NULL;
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}
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server.fd = -1;
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server.port = 0;
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/* Drop associated prompts */
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log_DestroyPrompts(&server);
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return 1;
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}
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return 0;
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}
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