--- /dev/null
+/*
+ * This module handles shared rooms, inter-Citadel mail, and outbound
+ * mailing list processing.
+ *
+ * Copyright (c) 2000-2011 by the citadel.org team
+ *
+ * This program is open source software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ * ** NOTE ** A word on the S_NETCONFIGS semaphore:
+ * This is a fairly high-level type of critical section. It ensures that no
+ * two threads work on the netconfigs files at the same time. Since we do
+ * so many things inside these, here are the rules:
+ * 1. begin_critical_section(S_NETCONFIGS) *before* begin_ any others.
+ * 2. Do *not* perform any I/O with the client during these sections.
+ *
+ */
+
+/*
+ * Duration of time (in seconds) after which pending list subscribe/unsubscribe
+ * requests that have not been confirmed will be deleted.
+ */
+#define EXP 259200 /* three days */
+
+#include "sysdep.h"
+#include <stdlib.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <fcntl.h>
+#include <ctype.h>
+#include <signal.h>
+#include <pwd.h>
+#include <errno.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <dirent.h>
+#if TIME_WITH_SYS_TIME
+# include <sys/time.h>
+# include <time.h>
+#else
+# if HAVE_SYS_TIME_H
+# include <sys/time.h>
+# else
+# include <time.h>
+# endif
+#endif
+#ifdef HAVE_SYSCALL_H
+# include <syscall.h>
+#else
+# if HAVE_SYS_SYSCALL_H
+# include <sys/syscall.h>
+# endif
+#endif
+
+#include <sys/wait.h>
+#include <string.h>
+#include <limits.h>
+#include <libcitadel.h>
+#include "citadel.h"
+#include "server.h"
+#include "citserver.h"
+#include "support.h"
+#include "config.h"
+#include "user_ops.h"
+#include "database.h"
+#include "msgbase.h"
+#include "internet_addressing.h"
+#include "serv_network.h"
+#include "clientsocket.h"
+#include "file_ops.h"
+#include "citadel_dirs.h"
+#include "threads.h"
+
+#ifndef HAVE_SNPRINTF
+#include "snprintf.h"
+#endif
+
+#include "context.h"
+#include "netconfig.h"
+#include "ctdl_module.h"
+
+
+/*
+ * We build a map of network nodes during processing.
+ */
+NetMap *the_netmap = NULL;
+int netmap_changed = 0;
+char *working_ignetcfg = NULL;
+
+/*
+ * Load or refresh the Citadel network (IGnet) configuration for this node.
+ */
+void load_working_ignetcfg(void) {
+ char *cfg;
+ char *oldcfg;
+
+ cfg = CtdlGetSysConfig(IGNETCFG);
+ if (cfg == NULL) {
+ cfg = strdup("");
+ }
+
+ oldcfg = working_ignetcfg;
+ working_ignetcfg = cfg;
+ if (oldcfg != NULL) {
+ free(oldcfg);
+ }
+}
+
+/*
+ * Read the network map from its configuration file into memory.
+ */
+void read_network_map(void) {
+ char *serialized_map = NULL;
+ int i;
+ char buf[SIZ];
+ NetMap *nmptr;
+
+ serialized_map = CtdlGetSysConfig(IGNETMAP);
+ if (serialized_map == NULL) return; /* if null, no entries */
+
+ /* Use the string tokenizer to grab one line at a time */
+ for (i=0; i<num_tokens(serialized_map, '\n'); ++i) {
+ extract_token(buf, serialized_map, i, '\n', sizeof buf);
+ nmptr = (NetMap *) malloc(sizeof(NetMap));
+ extract_token(nmptr->nodename, buf, 0, '|', sizeof nmptr->nodename);
+ nmptr->lastcontact = extract_long(buf, 1);
+ extract_token(nmptr->nexthop, buf, 2, '|', sizeof nmptr->nexthop);
+ nmptr->next = the_netmap;
+ the_netmap = nmptr;
+ }
+
+ free(serialized_map);
+ netmap_changed = 0;
+}
+
+
+/*
+ * Write the network map from memory back to the configuration file.
+ */
+void write_network_map(void) {
+ char *serialized_map = NULL;
+ NetMap *nmptr;
+
+
+ if (netmap_changed) {
+ serialized_map = strdup("");
+
+ if (the_netmap != NULL) {
+ for (nmptr = the_netmap; nmptr != NULL; nmptr = nmptr->next) {
+ serialized_map = realloc(serialized_map,
+ (strlen(serialized_map)+SIZ) );
+ if (!IsEmptyStr(nmptr->nodename)) {
+ snprintf(&serialized_map[strlen(serialized_map)],
+ SIZ,
+ "%s|%ld|%s\n",
+ nmptr->nodename,
+ (long)nmptr->lastcontact,
+ nmptr->nexthop);
+ }
+ }
+ }
+
+ CtdlPutSysConfig(IGNETMAP, serialized_map);
+ free(serialized_map);
+ }
+
+ /* Now free the list */
+ while (the_netmap != NULL) {
+ nmptr = the_netmap->next;
+ free(the_netmap);
+ the_netmap = nmptr;
+ }
+ netmap_changed = 0;
+}
+
+
+
+/*
+ * Keep track of what messages to reject
+ */
+FilterList *load_filter_list(void) {
+ char *serialized_list = NULL;
+ int i;
+ char buf[SIZ];
+ FilterList *newlist = NULL;
+ FilterList *nptr;
+
+ serialized_list = CtdlGetSysConfig(FILTERLIST);
+ if (serialized_list == NULL) return(NULL); /* if null, no entries */
+
+ /* Use the string tokenizer to grab one line at a time */
+ for (i=0; i<num_tokens(serialized_list, '\n'); ++i) {
+ extract_token(buf, serialized_list, i, '\n', sizeof buf);
+ nptr = (FilterList *) malloc(sizeof(FilterList));
+ extract_token(nptr->fl_user, buf, 0, '|', sizeof nptr->fl_user);
+ striplt(nptr->fl_user);
+ extract_token(nptr->fl_room, buf, 1, '|', sizeof nptr->fl_room);
+ striplt(nptr->fl_room);
+ extract_token(nptr->fl_node, buf, 2, '|', sizeof nptr->fl_node);
+ striplt(nptr->fl_node);
+
+ /* Cowardly refuse to add an any/any/any entry that would
+ * end up filtering every single message.
+ */
+ if (IsEmptyStr(nptr->fl_user) &&
+ IsEmptyStr(nptr->fl_room) &&
+ IsEmptyStr(nptr->fl_node)) {
+ free(nptr);
+ }
+ else {
+ nptr->next = newlist;
+ newlist = nptr;
+ }
+ }
+
+ free(serialized_list);
+ return newlist;
+}
+
+
+void free_filter_list(FilterList *fl) {
+ if (fl == NULL) return;
+ free_filter_list(fl->next);
+ free(fl);
+}
+
+/*
+ * Check the network map and determine whether the supplied node name is
+ * valid. If it is not a neighbor node, supply the name of a neighbor node
+ * which is the next hop. If it *is* a neighbor node, we also fill in the
+ * shared secret.
+ */
+int is_valid_node(char *nexthop, char *secret, char *node) {
+ int i;
+ char linebuf[SIZ];
+ char buf[SIZ];
+ int retval;
+ NetMap *nmptr;
+
+ if (node == NULL) {
+ return(-1);
+ }
+
+ /*
+ * First try the neighbor nodes
+ */
+ if (working_ignetcfg == NULL) {
+ syslog(LOG_ERR, "working_ignetcfg is NULL!\n");
+ if (nexthop != NULL) {
+ strcpy(nexthop, "");
+ }
+ return(-1);
+ }
+
+ retval = (-1);
+ if (nexthop != NULL) {
+ strcpy(nexthop, "");
+ }
+
+ /* Use the string tokenizer to grab one line at a time */
+ for (i=0; i<num_tokens(working_ignetcfg, '\n'); ++i) {
+ extract_token(linebuf, working_ignetcfg, i, '\n', sizeof linebuf);
+ extract_token(buf, linebuf, 0, '|', sizeof buf);
+ if (!strcasecmp(buf, node)) {
+ if (nexthop != NULL) {
+ strcpy(nexthop, "");
+ }
+ if (secret != NULL) {
+ extract_token(secret, linebuf, 1, '|', 256);
+ }
+ retval = 0;
+ }
+ }
+
+ if (retval == 0) {
+ return(retval); /* yup, it's a direct neighbor */
+ }
+
+ /*
+ * If we get to this point we have to see if we know the next hop
+ */
+ if (the_netmap != NULL) {
+ for (nmptr = the_netmap; nmptr != NULL; nmptr = nmptr->next) {
+ if (!strcasecmp(nmptr->nodename, node)) {
+ if (nexthop != NULL) {
+ strcpy(nexthop, nmptr->nexthop);
+ }
+ return(0);
+ }
+ }
+ }
+
+ /*
+ * If we get to this point, the supplied node name is bogus.
+ */
+ syslog(LOG_ERR, "Invalid node name <%s>\n", node);
+ return(-1);
+}
+
+
+
+void cmd_gnet(char *argbuf) {
+ char filename[PATH_MAX];
+ char buf[SIZ];
+ FILE *fp;
+
+ if ( (CC->room.QRflags & QR_MAILBOX) && (CC->user.usernum == atol(CC->room.QRname)) ) {
+ /* users can edit the netconfigs for their own mailbox rooms */
+ }
+ else if (CtdlAccessCheck(ac_room_aide)) return;
+
+ assoc_file_name(filename, sizeof filename, &CC->room, ctdl_netcfg_dir);
+ cprintf("%d Network settings for room #%ld <%s>\n",
+ LISTING_FOLLOWS,
+ CC->room.QRnumber, CC->room.QRname);
+
+ fp = fopen(filename, "r");
+ if (fp != NULL) {
+ while (fgets(buf, sizeof buf, fp) != NULL) {
+ buf[strlen(buf)-1] = 0;
+ cprintf("%s\n", buf);
+ }
+ fclose(fp);
+ }
+
+ cprintf("000\n");
+}
+
+
+void cmd_snet(char *argbuf) {
+ char tempfilename[PATH_MAX];
+ char filename[PATH_MAX];
+ int TmpFD;
+ StrBuf *Line;
+ struct stat StatBuf;
+ long len;
+ int rc;
+
+ unbuffer_output();
+
+ if ( (CC->room.QRflags & QR_MAILBOX) && (CC->user.usernum == atol(CC->room.QRname)) ) {
+ /* users can edit the netconfigs for their own mailbox rooms */
+ }
+ else if (CtdlAccessCheck(ac_room_aide)) return;
+
+ len = assoc_file_name(filename, sizeof filename, &CC->room, ctdl_netcfg_dir);
+ memcpy(tempfilename, filename, len + 1);
+
+ memset(&StatBuf, 0, sizeof(struct stat));
+ if ((stat(filename, &StatBuf) == -1) || (StatBuf.st_size == 0))
+ StatBuf.st_size = 80; /* Not there or empty? guess 80 chars line. */
+
+ sprintf(tempfilename + len, ".%d", CC->cs_pid);
+ errno = 0;
+ TmpFD = open(tempfilename, O_CREAT|O_EXCL|O_RDWR, S_IRUSR|S_IWUSR);
+
+ if ((TmpFD > 0) && (errno == 0))
+ {
+ char *tmp = malloc(StatBuf.st_size * 2);
+ memset(tmp, ' ', StatBuf.st_size * 2);
+ rc = write(TmpFD, tmp, StatBuf.st_size * 2);
+ free(tmp);
+ if ((rc <= 0) || (rc != StatBuf.st_size * 2))
+ {
+ close(TmpFD);
+ cprintf("%d Unable to allocate the space required for %s: %s\n",
+ ERROR + INTERNAL_ERROR,
+ tempfilename,
+ strerror(errno));
+ unlink(tempfilename);
+ return;
+ }
+ lseek(TmpFD, SEEK_SET, 0);
+ }
+ else {
+ cprintf("%d Unable to allocate the space required for %s: %s\n",
+ ERROR + INTERNAL_ERROR,
+ tempfilename,
+ strerror(errno));
+ unlink(tempfilename);
+ return;
+ }
+ Line = NewStrBuf();
+
+ cprintf("%d %s\n", SEND_LISTING, tempfilename);
+
+ len = 0;
+ while (rc = CtdlClientGetLine(Line),
+ (rc >= 0))
+ {
+ if ((rc == 3) && (strcmp(ChrPtr(Line), "000") == 0))
+ break;
+ StrBufAppendBufPlain(Line, HKEY("\n"), 0);
+ write(TmpFD, ChrPtr(Line), StrLength(Line));
+ len += StrLength(Line);
+ }
+ FreeStrBuf(&Line);
+ ftruncate(TmpFD, len);
+ close(TmpFD);
+
+ /* Now copy the temp file to its permanent location.
+ * (We copy instead of link because they may be on different filesystems)
+ */
+ begin_critical_section(S_NETCONFIGS);
+ rename(tempfilename, filename);
+ end_critical_section(S_NETCONFIGS);
+}
+
+/*
+ * cmd_netp() - authenticate to the server as another Citadel node polling
+ * for network traffic
+ */
+void cmd_netp(char *cmdbuf)
+{
+ char node[256];
+ char pass[256];
+ int v;
+
+ char secret[256];
+ char nexthop[256];
+ char err_buf[SIZ];
+
+ /* Authenticate */
+ extract_token(node, cmdbuf, 0, '|', sizeof node);
+ extract_token(pass, cmdbuf, 1, '|', sizeof pass);
+
+ /* load the IGnet Configuration to check node validity */
+ load_working_ignetcfg();
+ v = is_valid_node(nexthop, secret, node);
+
+ if (v != 0) {
+ snprintf(err_buf, sizeof err_buf,
+ "An unknown Citadel server called \"%s\" attempted to connect from %s [%s].\n",
+ node, CC->cs_host, CC->cs_addr
+ );
+ syslog(LOG_WARNING, "%s", err_buf);
+ cprintf("%d authentication failed\n", ERROR + PASSWORD_REQUIRED);
+ CtdlAideMessage(err_buf, "IGNet Networking.");
+ return;
+ }
+
+ if (strcasecmp(pass, secret)) {
+ snprintf(err_buf, sizeof err_buf,
+ "A Citadel server at %s [%s] failed to authenticate as network node \"%s\".\n",
+ CC->cs_host, CC->cs_addr, node
+ );
+ syslog(LOG_WARNING, "%s", err_buf);
+ cprintf("%d authentication failed\n", ERROR + PASSWORD_REQUIRED);
+ CtdlAideMessage(err_buf, "IGNet Networking.");
+ return;
+ }
+
+ if (network_talking_to(node, NTT_CHECK)) {
+ syslog(LOG_WARNING, "Duplicate session for network node <%s>", node);
+ cprintf("%d Already talking to %s right now\n", ERROR + RESOURCE_BUSY, node);
+ return;
+ }
+
+ safestrncpy(CC->net_node, node, sizeof CC->net_node);
+ network_talking_to(node, NTT_ADD);
+ syslog(LOG_NOTICE, "Network node <%s> logged in from %s [%s]\n",
+ CC->net_node, CC->cs_host, CC->cs_addr
+ );
+ cprintf("%d authenticated as network node '%s'\n", CIT_OK, CC->net_node);
+}
+
+/*
+ * Module entry point
+ */
+CTDL_MODULE_INIT(netconfig)
+{
+ if (!threading)
+ {
+ CtdlRegisterProtoHook(cmd_gnet, "GNET", "Get network config");
+ CtdlRegisterProtoHook(cmd_snet, "SNET", "Set network config");
+ CtdlRegisterProtoHook(cmd_netp, "NETP", "Identify as network poller");
+ }
+ return "netconfig";
+}
projects / citadel.git / blobdiff