libical, expat, and libsieve are now *required*.
[citadel.git] / citadel / citserver.c
index 909bdfd24c0138811d9887694d9cca4215b2dc30..6dba619936c800ab85004676a4f547c02d10d46d 100644 (file)
@@ -5,10 +5,6 @@
  *
  */
 
-#ifdef DLL_EXPORT
-#define IN_LIBCIT
-#endif
-
 #include "sysdep.h"
 #include <stdlib.h>
 #include <unistd.h>
 # endif
 #endif
 
+#if HAVE_BACKTRACE
+#include <execinfo.h>
+#endif
+
 #include <ctype.h>
 #include <string.h>
+#include <dirent.h>
 #include <errno.h>
 #include <limits.h>
-/* #include <dlfcn.h> */
 #include <netdb.h>
 #include <sys/types.h>
 #include <sys/socket.h>
 #include <netinet/in.h>
 #include <arpa/inet.h>
+#include <libcitadel.h>
 #include "citadel.h"
 #include "server.h"
-#include "serv_extensions.h"
 #include "sysdep_decls.h"
+#include "threads.h"
 #include "citserver.h"
 #include "config.h"
 #include "database.h"
 #include "file_ops.h"
 #include "policy.h"
 #include "control.h"
-#include "tools.h"
+#include "euidindex.h"
 
 #ifndef HAVE_SNPRINTF
 #include "snprintf.h"
 #endif
 
+#include "ctdl_module.h"
+
+
 struct CitContext *ContextList = NULL;
 struct CitContext* next_session = NULL;
 char *unique_session_numbers;
 int ScheduledShutdown = 0;
-int do_defrag = 0;
 time_t server_startup_time;
-char pid_file_name[PATH_MAX];
+int panic_fd;
+
+/**
+ * \brief print the actual stack frame.
+ */
+void cit_backtrace(void)
+{
+#ifdef HAVE_BACKTRACE
+       void *stack_frames[50];
+       size_t size, i;
+       char **strings;
+
+
+       size = backtrace(stack_frames, sizeof(stack_frames) / sizeof(void*));
+       strings = backtrace_symbols(stack_frames, size);
+       for (i = 0; i < size; i++) {
+               if (strings != NULL)
+                       lprintf(1, "%s\n", strings[i]);
+               else
+                       lprintf(1, "%p\n", stack_frames[i]);
+       }
+       free(strings);
+#endif
+}
+
+/**
+ * \brief print the actual stack frame.
+ */
+void cit_panic_backtrace(int SigNum)
+{
+#ifdef HAVE_BACKTRACE
+       void *stack_frames[10];
+       size_t size, i;
+       char **strings;
+
+       printf("caught signal 11\n");
+       size = backtrace(stack_frames, sizeof(stack_frames) / sizeof(void*));
+       strings = backtrace_symbols(stack_frames, size);
+       for (i = 0; i < size; i++) {
+               if (strings != NULL)
+                       lprintf(1, "%s\n", strings[i]);
+               else
+                       lprintf(1, "%p\n", stack_frames[i]);
+       }
+       free(strings);
+#endif
+       exit(-1);
+}
 
 /*
  * Various things that need to be initialized at startup
@@ -78,30 +128,21 @@ void master_startup(void) {
        unsigned int seed;
        FILE *urandom;
        struct ctdlroom qrbuf;
-       FILE *pidfile_fp;
        
        lprintf(CTDL_DEBUG, "master_startup() started\n");
        time(&server_startup_time);
 
-       /* pid file.  If we go FSSTND this should end up in 'localstatedir' */
-       snprintf(pid_file_name, sizeof pid_file_name, "./citadel.pid");
-       pidfile_fp = fopen(pid_file_name, "w");
-       if (pidfile_fp != NULL) {
-               fprintf(pidfile_fp, "%d\n", (int)getpid());
-               fclose(pidfile_fp);
-       }
-
        lprintf(CTDL_INFO, "Opening databases\n");
        open_databases();
 
-       if (do_defrag) {
-               defrag_databases();
-       }
-
+       ctdl_thread_internal_init_tsd();
+       
+       CtdlThreadAllocTSD();
+       
        check_ref_counts();
 
        lprintf(CTDL_INFO, "Creating base rooms (if necessary)\n");
-       create_room(BASEROOM,           0, "", 0, 1, 0, VIEW_BBS);
+       create_room(config.c_baseroom,  0, "", 0, 1, 0, VIEW_BBS);
        create_room(AIDEROOM,           3, "", 0, 1, 0, VIEW_BBS);
        create_room(SYSCONFIGROOM,      3, "", 0, 1, 0, VIEW_BBS);
        create_room(config.c_twitroom,  0, "", 0, 1, 0, VIEW_BBS);
@@ -112,6 +153,12 @@ void master_startup(void) {
                 lputroom(&qrbuf);
         }
 
+       /* Aide needs to be public postable, else we're not RFC conformant. */
+        if (lgetroom(&qrbuf, AIDEROOM) == 0) {
+                qrbuf.QRflags2 |= QR2_SMTP_PUBLIC;
+                lputroom(&qrbuf);
+        }
+
        lprintf(CTDL_INFO, "Seeding the pseudo-random number generator...\n");
        urandom = fopen("/dev/urandom", "r");
        if (urandom != NULL) {
@@ -148,22 +195,37 @@ void master_cleanup(int exitcode) {
                (*fcn->h_function_pointer)();
        }
 
-       /* Close databases */
-       lprintf(CTDL_INFO, "Closing databases\n");
-       close_databases();
+       /* Close the AdjRefCount queue file */
+       AdjRefCount(-1, 0);
 
        /* Do system-dependent stuff */
        sysdep_master_cleanup();
+       
+       /* Close databases */
+       lprintf(CTDL_INFO, "Closing databases\n");
+       close_databases();
 
 #ifdef DEBUG_MEMORY_LEAKS
        dump_heap();
 #endif
 
+       /* If the operator requested a halt but not an exit, halt here. */
+       if (shutdown_and_halt) {
+               lprintf(CTDL_NOTICE, "citserver: Halting server without exiting.\n");
+               fflush(stdout); fflush(stderr);
+               while(1) {
+                       sleep(32767);
+               }
+       }
+       
+       release_control();
+
        /* Now go away. */
        lprintf(CTDL_NOTICE, "citserver: Exiting with status %d\n", exitcode);
        fflush(stdout); fflush(stderr);
-
-       unlink(pid_file_name);
+       
+       if (restart_server != 0)
+               exit(1);
        exit(exitcode);
 }
 
@@ -193,7 +255,6 @@ void RemoveContext (struct CitContext *con)
        lprintf(CTDL_DEBUG, "Calling logout(%d)\n", con->cs_pid);
        logout(con);
 
-       unlink(con->temp);
        lprintf(CTDL_NOTICE, "[%3d] Session ended.\n", con->cs_pid);
 
        /* If the client is still connected, blow 'em away. */
@@ -218,7 +279,7 @@ void cmd_info(void) {
        cprintf("%s\n", config.c_fqdn);
        cprintf("%s\n", CITADEL);
        cprintf("%d\n", REV_LEVEL);
-       cprintf("%s\n", config.c_bbs_city);
+       cprintf("%s\n", config.c_site_location);
        cprintf("%s\n", config.c_sysadm);
        cprintf("%d\n", SERVER_TYPE);
        cprintf("%s\n", config.c_moreprompt);
@@ -226,11 +287,30 @@ void cmd_info(void) {
        cprintf("1\n"); /* 1 = we support the extended paging options */
        cprintf("%s\n", CC->cs_nonce);
        cprintf("1\n"); /* 1 = yes, this system supports the QNOP command */
+
 #ifdef HAVE_LDAP
        cprintf("1\n"); /* 1 = yes, this server is LDAP-enabled */
 #else
        cprintf("0\n"); /* 1 = no, this server is not LDAP-enabled */
 #endif
+
+       if (config.c_auth_mode == AUTHMODE_NATIVE) {
+               cprintf("%d\n", config.c_disable_newu);
+       }
+       else {
+               cprintf("1\n"); /* "create new user" does not work with non-native auth modes */
+       }
+
+       cprintf("%s\n", config.c_default_cal_zone);
+
+       /* Output load averages */
+       cprintf("%f\n", CtdlThreadLoadAvg);
+       cprintf("%f\n", CtdlThreadWorkerAvg);
+       cprintf("%d\n", CtdlThreadGetCount());
+
+       cprintf("1\n");         /* yes, Sieve mail filtering is supported */
+       cprintf("%d\n", config.c_enable_fulltext);
+       
        cprintf("000\n");
 }
 
@@ -273,15 +353,24 @@ void cmd_time(void)
  */
 int is_public_client(void)
 {
-       char buf[SIZ];
-       char addrbuf[SIZ];
+       char buf[1024];
+       char addrbuf[1024];
        FILE *fp;
        int i;
+       char *public_clientspos;
+       char *public_clientsend;
+       char *paddr = NULL;
        struct stat statbuf;
        static time_t pc_timestamp = 0;
        static char public_clients[SIZ];
+       static char public_clients_file[SIZ];
+
+#define LOCALHOSTSTR "127.0.0.1"
 
-#define PUBLIC_CLIENTS "./public_clients"
+       snprintf(public_clients_file, 
+                        sizeof public_clients_file,
+                        "%s/public_clients",
+                        ctdl_etc_dir);
 
        /*
         * Check the time stamp on the public_clients file.  If it's been
@@ -289,38 +378,56 @@ int is_public_client(void)
         * time we've been through the loop), read its contents and learn
         * the IP addresses of the listed hosts.
         */
-       if (stat(PUBLIC_CLIENTS, &statbuf) != 0) {
+       if (stat(public_clients_file, &statbuf) != 0) {
                /* No public_clients file exists, so bail out */
-               lprintf(CTDL_WARNING, "Warning: '%s' does not exist\n", PUBLIC_CLIENTS);
+               lprintf(CTDL_WARNING, "Warning: '%s' does not exist\n", 
+                               public_clients_file);
                return(0);
        }
 
        if (statbuf.st_mtime > pc_timestamp) {
                begin_critical_section(S_PUBLIC_CLIENTS);
-               lprintf(CTDL_INFO, "Loading %s\n", PUBLIC_CLIENTS);
+               lprintf(CTDL_INFO, "Loading %s\n", public_clients_file);
 
-               strcpy(public_clients, "127.0.0.1");
+               public_clientspos = &public_clients[0];
+               public_clientsend = public_clientspos + SIZ;
+               safestrncpy(public_clientspos, LOCALHOSTSTR, sizeof public_clients);
+               public_clientspos += sizeof(LOCALHOSTSTR) - 1;
+               
                if (hostname_to_dotted_quad(addrbuf, config.c_fqdn) == 0) {
-                       strcat(public_clients, "|");
-                       strcat(public_clients, addrbuf);
+                       *(public_clientspos++) = '|';
+                       paddr = &addrbuf[0];
+                       while (!IsEmptyStr (paddr) && 
+                              (public_clientspos < public_clientsend))
+                               *(public_clientspos++) = *(paddr++);
                }
 
-               fp = fopen("public_clients", "r");
-               if (fp != NULL) while (fgets(buf, sizeof buf, fp)!=NULL) {
-                       for (i=0; i<strlen(buf); ++i) {
-                               if (buf[i] == '#') buf[i] = 0;
-                       }
-                       while (isspace((buf[strlen(buf)-1]))) {
-                               buf[strlen(buf)-1] = 0;
-                       }
-                       if (hostname_to_dotted_quad(addrbuf, buf) == 0) {
-                               if ((strlen(public_clients) +
-                                  strlen(addrbuf) + 2)
-                                  < sizeof(public_clients)) {
-                                       strcat(public_clients, addrbuf);
+               fp = fopen(public_clients_file, "r");
+               if (fp != NULL) 
+                       while ((fgets(buf, sizeof buf, fp)!=NULL) &&
+                              (public_clientspos < public_clientsend)){
+                               char *ptr;
+                               ptr = buf;
+                               while (!IsEmptyStr(ptr)) {
+                                       if (*ptr == '#') {
+                                               *ptr = 0;
+                                               break;
+                                       }
+                               else ptr++;
+                               }
+                               ptr--;
+                               while (ptr>buf && isspace(*ptr)) {
+                                       *(ptr--) = 0;
+                               }
+                               if (hostname_to_dotted_quad(addrbuf, buf) == 0) {
+                                       *(public_clientspos++) = '|';
+                                       paddr = addrbuf;
+                                       while (!IsEmptyStr(paddr) && 
+                                              (public_clientspos < public_clientsend)){
+                                               *(public_clientspos++) = *(paddr++);
+                                       }
                                }
                        }
-               }
                fclose(fp);
                pc_timestamp = time(NULL);
                end_critical_section(S_PUBLIC_CLIENTS);
@@ -329,7 +436,7 @@ int is_public_client(void)
        lprintf(CTDL_DEBUG, "Checking whether %s is a local or public client\n",
                CC->cs_addr);
        for (i=0; i<num_parms(public_clients); ++i) {
-               extract(addrbuf, public_clients, i);
+               extract_token(addrbuf, public_clients, i, '|', sizeof addrbuf);
                if (!strcasecmp(CC->cs_addr, addrbuf)) {
                        lprintf(CTDL_DEBUG, "... yes it is.\n");
                        return(1);
@@ -350,8 +457,8 @@ void cmd_iden(char *argbuf)
        int dev_code;
        int cli_code;
        int rev_level;
-       char desc[SIZ];
-       char from_host[SIZ];
+       char desc[128];
+       char from_host[128];
        struct in_addr addr;
        int do_lookup = 0;
 
@@ -363,11 +470,11 @@ void cmd_iden(char *argbuf)
        dev_code = extract_int(argbuf,0);
        cli_code = extract_int(argbuf,1);
        rev_level = extract_int(argbuf,2);
-       extract(desc,argbuf,3);
+       extract_token(desc, argbuf, 3, '|', sizeof desc);
 
        safestrncpy(from_host, config.c_fqdn, sizeof from_host);
        from_host[sizeof from_host - 1] = 0;
-       if (num_parms(argbuf)>=5) extract(from_host,argbuf,4);
+       if (num_parms(argbuf)>=5) extract_token(from_host, argbuf, 4, '|', sizeof from_host);
 
        CC->cs_clientdev = dev_code;
        CC->cs_clienttyp = cli_code;
@@ -375,7 +482,7 @@ void cmd_iden(char *argbuf)
        safestrncpy(CC->cs_clientname, desc, sizeof CC->cs_clientname);
        CC->cs_clientname[31] = 0;
 
-       if (strlen(from_host) > 0) {
+       if (!IsEmptyStr(from_host)) {
                if (CC->is_local_socket) do_lookup = 1;
                else if (is_public_client()) do_lookup = 1;
        }
@@ -384,7 +491,7 @@ void cmd_iden(char *argbuf)
                lprintf(CTDL_DEBUG, "Looking up hostname '%s'\n", from_host);
                if ((addr.s_addr = inet_addr(from_host)) != -1) {
                        locate_host(CC->cs_host, sizeof CC->cs_host,
-                               NULL, 0,
+                               CC->cs_addr, sizeof CC->cs_addr,
                                &addr);
                }
                else {
@@ -410,43 +517,76 @@ void cmd_iden(char *argbuf)
 void cmd_mesg(char *mname)
 {
        FILE *mfp;
-       char targ[SIZ];
-       char buf[SIZ];
-       char buf2[SIZ];
+       char targ[256];
+       char buf[256];
+       char buf2[256];
        char *dirs[2];
+       DIR *dp;
+       struct dirent *d;
+
+       extract_token(buf, mname, 0, '|', sizeof buf);
+
+       dirs[0] = strdup(ctdl_message_dir);
+       dirs[1] = strdup(ctdl_hlp_dir);
+
+       snprintf(buf2, sizeof buf2, "%s.%d.%d",
+               buf, CC->cs_clientdev, CC->cs_clienttyp);
+
+       /* If the client requested "?" then produce a listing */
+       if (!strcmp(buf, "?")) {
+               cprintf("%d %s\n", LISTING_FOLLOWS, buf);
+               dp = opendir(dirs[1]);
+               if (dp != NULL) {
+                       while (d = readdir(dp), d != NULL) {
+                               if (d->d_name[0] != '.') {
+                                       cprintf(" %s\n", d->d_name);
+                               }
+                       }
+                       closedir(dp);
+               }
+               cprintf("000\n");
+               free(dirs[0]);
+               free(dirs[1]);
+               return;
+       }
 
-       extract(buf,mname,0);
-
-       dirs[0]=malloc(64);
-       dirs[1]=malloc(64);
-       strcpy(dirs[0],"messages");
-       strcpy(dirs[1],"help");
-       snprintf(buf2, sizeof buf2, "%s.%d.%d", buf, CC->cs_clientdev, CC->cs_clienttyp);
-       mesg_locate(targ,sizeof targ,buf2,2,(const char **)dirs);
-       if (strlen(targ) == 0) {
-               snprintf(buf2, sizeof buf2, "%s.%d", buf, CC->cs_clientdev);
-               mesg_locate(targ,sizeof targ,buf2,2,(const char **)dirs);
-               if (strlen(targ) == 0) {
-                       mesg_locate(targ,sizeof targ,buf,2,(const char **)dirs);
-               }       
+       /* Otherwise, look for the requested file by name. */
+       else {
+               mesg_locate(targ, sizeof targ, buf2, 2, (const char **)dirs);
+               if (IsEmptyStr(targ)) {
+                       snprintf(buf2, sizeof buf2, "%s.%d",
+                                                       buf, CC->cs_clientdev);
+                       mesg_locate(targ, sizeof targ, buf2, 2,
+                                                       (const char **)dirs);
+                       if (IsEmptyStr(targ)) {
+                               mesg_locate(targ, sizeof targ, buf, 2,
+                                                       (const char **)dirs);
+                       }       
+               }
        }
+
        free(dirs[0]);
        free(dirs[1]);
 
-       if (strlen(targ)==0) {
-               cprintf("%d '%s' not found.\n",ERROR + FILE_NOT_FOUND, mname);
+       if (IsEmptyStr(targ)) {
+               cprintf("%d '%s' not found.  (Searching in %s and %s)\n",
+                       ERROR + FILE_NOT_FOUND,
+                       mname,
+                       ctdl_message_dir,
+                       ctdl_hlp_dir
+               );
                return;
        }
 
-       mfp = fopen(targ,"r");
+       mfp = fopen(targ, "r");
        if (mfp==NULL) {
                cprintf("%d Cannot open '%s': %s\n",
                        ERROR + INTERNAL_ERROR, targ, strerror(errno));
                return;
        }
-       cprintf("%d %s\n",LISTING_FOLLOWS,buf);
+       cprintf("%d %s\n", LISTING_FOLLOWS,buf);
 
-       while (fgets(buf, (SIZ-1), mfp)!=NULL) {
+       while (fgets(buf, (sizeof buf - 1), mfp) != NULL) {
                buf[strlen(buf)-1] = 0;
                do_help_subst(buf);
                cprintf("%s\n",buf);
@@ -463,8 +603,8 @@ void cmd_mesg(char *mname)
 void cmd_emsg(char *mname)
 {
        FILE *mfp;
-       char targ[SIZ];
-       char buf[SIZ];
+       char targ[256];
+       char buf[256];
        char *dirs[2];
        int a;
 
@@ -472,21 +612,22 @@ void cmd_emsg(char *mname)
 
        if (CtdlAccessCheck(ac_aide)) return;
 
-       extract(buf,mname,0);
-       for (a=0; a<strlen(buf); ++a) {         /* security measure */
+       extract_token(buf, mname, 0, '|', sizeof buf);
+       for (a=0; !IsEmptyStr(&buf[a]); ++a) {          /* security measure */
                if (buf[a] == '/') buf[a] = '.';
        }
 
-       dirs[0]=malloc(64);
-       dirs[1]=malloc(64);
-       strcpy(dirs[0],"messages");
-       strcpy(dirs[1],"help");
-       mesg_locate(targ,sizeof targ,buf,2,(const char**)dirs);
+       dirs[0] = strdup(ctdl_message_dir);
+       dirs[1] = strdup(ctdl_hlp_dir);
+
+       mesg_locate(targ, sizeof targ, buf, 2, (const char**)dirs);
        free(dirs[0]);
        free(dirs[1]);
 
-       if (strlen(targ)==0) {
-               snprintf(targ, sizeof targ, "./help/%s", buf);
+       if (IsEmptyStr(targ)) {
+               snprintf(targ, sizeof targ, 
+                                "%s/%s",
+                                ctdl_hlp_dir, buf);
        }
 
        mfp = fopen(targ,"w");
@@ -526,9 +667,9 @@ void GenerateRoomDisplay(char *real_room,
        }
 
        if (viewed->cs_flags & CS_CHAT) {
-               while (strlen(real_room) < 14)
+               while (strlen(real_room) < 14) {
                        strcat(real_room, " ");
-
+               }
                strcpy(&real_room[14], "<chat>");
        }
 
@@ -685,12 +826,43 @@ void cmd_ipgm(char *argbuf)
 /*
  * Shut down the server
  */
-void cmd_down(void) {
+void cmd_down(char *argbuf) {
+       char *Reply ="%d Shutting down server.  Goodbye.\n";
 
        if (CtdlAccessCheck(ac_aide)) return;
 
-       cprintf("%d Shutting down server.  Goodbye.\n", CIT_OK);
-       time_to_die = 1;
+       if (!IsEmptyStr(argbuf))
+       {
+               int state = CIT_OK;
+               restart_server = extract_int(argbuf, 0);
+               
+               if (restart_server > 0)
+                       Reply = "%d Restarting server.  See you soon.\n";
+               if ((restart_server > 0) && !running_as_daemon)
+               {
+                       lprintf(CTDL_ERR, "The user requested restart, but not running as deamon! Geronimooooooo!\n");
+                       Reply = "%d Warning, not running in deamon mode. maybe we will come up again, but don't lean on it.\n";
+                       state = ERROR;
+               }
+               cprintf(Reply, state);
+       }
+       else
+       {
+               cprintf(Reply, CIT_OK + SERVER_SHUTTING_DOWN);
+       }
+       CtdlThreadStopAll();
+}
+
+/*
+ * Halt the server without exiting the server process.
+ */
+void cmd_halt(void) {
+
+       if (CtdlAccessCheck(ac_aide)) return;
+
+       cprintf("%d Halting server.  Goodbye.\n", CIT_OK);
+       CtdlThreadStopAll();
+       shutdown_and_halt = 1;
 }
 
 /*
@@ -699,14 +871,29 @@ void cmd_down(void) {
 void cmd_scdn(char *argbuf)
 {
        int new_state;
+       int state = CIT_OK;
+       char *Reply = "%d %d\n";
 
        if (CtdlAccessCheck(ac_aide)) return;
 
        new_state = extract_int(argbuf, 0);
+       if ((new_state == 2) || (new_state == 3))
+       {
+               restart_server = 1;
+               if (!running_as_daemon)
+               {
+                       lprintf(CTDL_ERR, "The user requested restart, but not running as deamon! Geronimooooooo!\n");
+                       Reply = "%d %d Warning, not running in deamon mode. maybe we will come up again, but don't lean on it.\n";
+                       state = ERROR;
+               }
+
+               restart_server = extract_int(argbuf, 0);
+               new_state -= 2;
+       }
        if ((new_state == 0) || (new_state == 1)) {
                ScheduledShutdown = new_state;
        }
-       cprintf("%d %d\n", CIT_OK, ScheduledShutdown);
+       cprintf(Reply, state, ScheduledShutdown);
 }
 
 
@@ -749,7 +936,7 @@ void generate_nonce(struct CitContext *con) {
  */
 void begin_session(struct CitContext *con)
 {
-       int len;
+       socklen_t len;
        struct sockaddr_in sin;
 
        /* 
@@ -765,23 +952,22 @@ void begin_session(struct CitContext *con)
        strcpy(con->lastcmdname, "    ");
        strcpy(con->cs_clientname, "(unknown)");
        strcpy(con->curr_user, NLI);
-       strcpy(con->net_node,"");
-       strcpy(con->fake_username, "");
-       strcpy(con->fake_postname, "");
-       strcpy(con->fake_hostname, "");
-       strcpy(con->fake_roomname, "");
+       *con->net_node = '\0';
+       *con->fake_username = '\0';
+       *con->fake_hostname = '\0';
+       *con->fake_roomname = '\0';
        generate_nonce(con);
-       safestrncpy(con->temp, tmpnam(NULL), sizeof con->temp);
        safestrncpy(con->cs_host, config.c_fqdn, sizeof con->cs_host);
        safestrncpy(con->cs_addr, "", sizeof con->cs_addr);
        con->cs_host[sizeof con->cs_host - 1] = 0;
        len = sizeof sin;
        if (!CC->is_local_socket) {
-               if (!getpeername(con->client_socket,
-                  (struct sockaddr *) &sin, &len))     /* should be socklen_t but doesn't work on Macintosh */
+               if (!getpeername(con->client_socket, (struct sockaddr *) &sin, &len)) {
                        locate_host(con->cs_host, sizeof con->cs_host,
                                con->cs_addr, sizeof con->cs_addr,
-                               &sin.sin_addr);
+                               &sin.sin_addr
+                       );
+               }
        }
        else {
                strcpy(con->cs_host, "");
@@ -791,10 +977,16 @@ void begin_session(struct CitContext *con)
        con->dl_is_net = 0;
 
        con->nologin = 0;
-       if ((config.c_maxsessions > 0)&&(num_sessions > config.c_maxsessions))
+       if ((config.c_maxsessions > 0)&&(num_sessions > config.c_maxsessions)) {
                con->nologin = 1;
+       }
 
-       lprintf(CTDL_NOTICE, "Session started.\n");
+       if (!CC->is_local_socket) {
+               lprintf(CTDL_NOTICE, "Session started from %s [%s].\n", con->cs_host, con->cs_addr);
+       }
+       else {
+               lprintf(CTDL_NOTICE, "Session started via local socket.\n");
+       }
 
        /* Run any session startup routines registered by loadable modules */
        PerformSessionHooks(EVT_START);
@@ -803,10 +995,11 @@ void begin_session(struct CitContext *con)
 
 void citproto_begin_session() {
        if (CC->nologin==1) {
-               cprintf("%d %s: Too many users are already online "
-                       "(maximum is %d)\n",
+               cprintf("%d %s: Too many users are already online (maximum is %d)\n",
                        ERROR + MAX_SESSIONS_EXCEEDED,
-                       config.c_nodename, config.c_maxsessions);
+                       config.c_nodename, config.c_maxsessions
+               );
+               CC->kill_me = 1;
        }
        else {
                cprintf("%d %s Citadel server ready.\n",
@@ -822,12 +1015,16 @@ void citproto_begin_session() {
  */
 void do_command_loop(void) {
        char cmdbuf[SIZ];
-
+       const char *old_name = NULL;
+       
+       old_name = CtdlThreadName("do_command_loop");
+       
        time(&CC->lastcmd);
        memset(cmdbuf, 0, sizeof cmdbuf); /* Clear it, just in case */
        if (client_getln(cmdbuf, sizeof cmdbuf) < 1) {
-               lprintf(CTDL_ERR, "Client socket is broken; ending session\n");
+               lprintf(CTDL_ERR, "Client disconnected: ending session.\n");
                CC->kill_me = 1;
+               CtdlThreadName(old_name);
                return;
        }
 
@@ -844,17 +1041,20 @@ void do_command_loop(void) {
 
        /*
         * Let other clients see the last command we executed, and
-        * update the idle time, but not NOOP, QNOP, PEXP, or GEXP.
+        * update the idle time, but not NOOP, QNOP, PEXP, GEXP, RWHO, or TIME.
         */
        if ( (strncasecmp(cmdbuf, "NOOP", 4))
           && (strncasecmp(cmdbuf, "QNOP", 4))
           && (strncasecmp(cmdbuf, "PEXP", 4))
-          && (strncasecmp(cmdbuf, "GEXP", 4)) ) {
+          && (strncasecmp(cmdbuf, "GEXP", 4))
+          && (strncasecmp(cmdbuf, "RWHO", 4))
+          && (strncasecmp(cmdbuf, "TIME", 4)) ) {
                strcpy(CC->lastcmdname, "    ");
-               safestrncpy(CC->lastcmdname, cmdbuf, 
-                       sizeof(CC->lastcmdname) );
+               safestrncpy(CC->lastcmdname, cmdbuf, sizeof(CC->lastcmdname));
                time(&CC->lastidle);
        }
+       
+       CtdlThreadName(cmdbuf);
                
        if ((strncasecmp(cmdbuf, "ENT0", 4))
           && (strncasecmp(cmdbuf, "MESG", 4))
@@ -863,11 +1063,15 @@ void do_command_loop(void) {
           CC->cs_flags &= ~CS_POSTING;
        }
                   
-       if (!strncasecmp(cmdbuf,"NOOP",4)) {
+       if (!strncasecmp(cmdbuf, "NOOP", 4)) {
                cprintf("%d%cok\n", CIT_OK, CtdlCheckExpress() );
        }
        
-       else if (!strncasecmp(cmdbuf,"QNOP",4)) {
+       else if (!strncasecmp(cmdbuf, "XYZZY", 5)) {
+               cprintf("%d Nothing happens.\n", CIT_OK);
+       }
+       
+       else if (!strncasecmp(cmdbuf, "QNOP", 4)) {
                /* do nothing, this command returns no response */
        }
 
@@ -953,6 +1157,10 @@ void do_command_loop(void) {
                cmd_rdir();
        }
 
+       else if (!strncasecmp(cmdbuf,"EUID",4)) {
+               cmd_euid(&cmdbuf[5]);
+       }
+
        else if (!strncasecmp(cmdbuf,"MSG0",4)) {
                cmd_msg0(&cmdbuf[5]);
        }
@@ -977,6 +1185,10 @@ void do_command_loop(void) {
                cmd_opna(&cmdbuf[5]);
        }
 
+       else if (!strncasecmp(cmdbuf,"DLAT",4)) {
+               cmd_dlat(&cmdbuf[5]);
+       }
+
        else if (!strncasecmp(cmdbuf,"INFO",4)) {
                cmd_info();
        }
@@ -1058,7 +1270,7 @@ void do_command_loop(void) {
        }
 
        else if (!strncasecmp(cmdbuf,"LIST",4)) {
-               cmd_list();
+               cmd_list(&cmdbuf[5]);
        }
 
        else if (!strncasecmp(cmdbuf,"CHEK",4)) {
@@ -1154,7 +1366,11 @@ void do_command_loop(void) {
        }
 
        else if (!strncasecmp(cmdbuf,"DOWN",4)) {
-               cmd_down();
+               cmd_down(&cmdbuf[5]);
+       }
+
+       else if (!strncasecmp(cmdbuf,"HALT",4)) {
+               cmd_halt();
        }
 
        else if (!strncasecmp(cmdbuf,"SCDN",4)) {
@@ -1205,15 +1421,19 @@ void do_command_loop(void) {
                cmd_isme(&cmdbuf[5]);
        }
 
+       else if (!strncasecmp(cmdbuf, "RENU", 4)) {
+               cmd_renu(&cmdbuf[5]);
+       }
+
        else if (!DLoader_Exec_Cmd(cmdbuf)) {
-               cprintf("%d Unrecognized or unsupported command.\n",
-                       ERROR + CMD_NOT_SUPPORTED);
-              }
+               cprintf("%d Unrecognized or unsupported command.\n", ERROR + CMD_NOT_SUPPORTED);
+       }
 
        unbuffer_output();
 
        /* Run any after-each-command routines registered by modules */
        PerformSessionHooks(EVT_CMD);
+       CtdlThreadName(old_name);
 }