citadel/dynloader.c

   1 /*******************************************************
   2  *
   3  * Citadel Dynamic Loading Module
   4  * Written by Brian Costello
   5  * btx@calyx.net
   6  *
   7  * $Id$
   8  *
   9  ******************************************************/
  10
  11
  12 #include "sysdep.h"
  13 #include <stdio.h>
  14 #include <stdlib.h>
  15 #include <dlfcn.h>
  16 #include <sys/types.h>
  17 #include <dirent.h>
  18 #include <strings.h>
  19 #include <syslog.h>
  20 #ifdef HAVE_PTHREAD_H
  21 #include <pthread.h>
  22 #endif
  23 #include <limits.h>
  24 #include <ctype.h>
  25 #include "dynloader.h"
  26 #include "citadel.h"
  27 #include "server.h"
  28 #include "sysdep_decls.h"
  29 #include "tools.h"
  30
  31 #ifndef HAVE_SNPRINTF
  32 #include <stdarg.h>
  33 #include "snprintf.h"
  34 #endif
  35
  36 struct LogFunctionHook *LogHookTable = NULL;
  37 struct CleanupFunctionHook *CleanupHookTable = NULL;
  38 struct SessionFunctionHook *SessionHookTable = NULL;
  39 struct UserFunctionHook *UserHookTable = NULL;
  40 struct XmsgFunctionHook *XmsgHookTable = NULL;
  41
  42 struct ProtoFunctionHook {
  43         void (*handler) (char *cmdbuf);
  44         char *cmd;
  45         char *desc;
  46         struct ProtoFunctionHook *next;
  47 } *ProtoHookList = NULL;
  48
  49 void CtdlRegisterProtoHook(void (*handler) (char *), char *cmd, char *desc)
  50 {
  51         struct ProtoFunctionHook *p = mallok(sizeof *p);
  52
  53         if (p == NULL) {
  54                 fprintf(stderr, "can't malloc new ProtoFunctionHook\n");
  55                 exit(EXIT_FAILURE);
  56         }
  57         p->handler = handler;
  58         p->cmd = cmd;
  59         p->desc = desc;
  60         p->next = ProtoHookList;
  61         ProtoHookList = p;
  62         lprintf(5, "Registered server command %s (%s)\n", cmd, desc);
  63 }
  64
  65 int DLoader_Exec_Cmd(char *cmdbuf)
  66 {
  67         struct ProtoFunctionHook *p;
  68
  69         for (p = ProtoHookList; p; p = p->next) {
  70                 if (!strncasecmp(cmdbuf, p->cmd, 4)) {
  71                         p->handler(&cmdbuf[5]);
  72                         return 1;
  73                 }
  74         }
  75         return 0;
  76 }
  77
  78 void DLoader_Init(char *pathname)
  79 {
  80         void *fcn_handle;
  81         char dl_error[256];
  82         DIR *dir;
  83         int i;
  84         struct dirent *dptr;
  85         char *(*h_init_fcn) (void);
  86         char *dl_info;
  87
  88         char pathbuf[PATH_MAX];
  89
  90         if ((dir = opendir(pathname)) == NULL) {
  91                 perror("opendir");
  92                 exit(1);
  93         }
  94         while ((dptr = readdir(dir)) != NULL) {
  95                 if (dptr->d_name[0] == '.')
  96                         continue;
  97
  98                 snprintf(pathbuf, PATH_MAX, "%s/%s", pathname, dptr->d_name);
  99 #ifdef RTLD_NOW
 100                 if (!(fcn_handle = dlopen(pathbuf, RTLD_NOW)))
 101 #else                           /* OpenBSD */
 102                 if (!(fcn_handle = dlopen(pathbuf, DL_LAZY)))
 103 #endif
 104                 {
 105                         safestrncpy(dl_error, dlerror(), sizeof dl_error);
 106                         for (i=0; i<strlen(dl_error); ++i)
 107                                 if (!isprint(dl_error[i]))
 108                                         dl_error[i]='.';
 109                         fprintf(stderr, "DLoader_Init dlopen failed: %s\n",
 110                                 dl_error);
 111                         continue;
 112                 }
 113                 h_init_fcn = (char * (*)(void))
 114 #ifndef __OpenBSD__
 115                     dlsym(fcn_handle, "Dynamic_Module_Init");
 116 #else
 117                     dlsym(fcn_handle, "_Dynamic_Module_Init");
 118 #endif
 119
 120                 if (dlerror() != NULL) {
 121                         fprintf(stderr, "DLoader_Init dlsym failed\n");
 122                         continue;
 123                 }
 124                 dl_info = h_init_fcn();
 125
 126                 lprintf(3, "Loaded module: %s\n", dl_info);
 127         }       /* While */
 128 }
 129
 130
 131
 132 void CtdlRegisterLogHook(void (*fcn_ptr) (char *), int loglevel)
 133 {
 134
 135         struct LogFunctionHook *newfcn;
 136
 137         newfcn = (struct LogFunctionHook *)
 138             mallok(sizeof(struct LogFunctionHook));
 139         newfcn->next = LogHookTable;
 140         newfcn->h_function_pointer = fcn_ptr;
 141         newfcn->loglevel = loglevel;
 142         LogHookTable = newfcn;
 143
 144         lprintf(5, "Registered a new logging function\n");
 145 }
 146
 147
 148 void CtdlRegisterCleanupHook(void (*fcn_ptr) (void))
 149 {
 150
 151         struct CleanupFunctionHook *newfcn;
 152
 153         newfcn = (struct CleanupFunctionHook *)
 154             mallok(sizeof(struct CleanupFunctionHook));
 155         newfcn->next = CleanupHookTable;
 156         newfcn->h_function_pointer = fcn_ptr;
 157         CleanupHookTable = newfcn;
 158
 159         lprintf(5, "Registered a new cleanup function\n");
 160 }
 161
 162
 163 void CtdlRegisterSessionHook(void (*fcn_ptr) (void), int EventType)
 164 {
 165
 166         struct SessionFunctionHook *newfcn;
 167
 168         newfcn = (struct SessionFunctionHook *)
 169             mallok(sizeof(struct SessionFunctionHook));
 170         newfcn->next = SessionHookTable;
 171         newfcn->h_function_pointer = fcn_ptr;
 172         newfcn->eventtype = EventType;
 173         SessionHookTable = newfcn;
 174
 175         lprintf(5, "Registered a new session function (type %d)\n",
 176                 EventType);
 177 }
 178
 179
 180 void CtdlRegisterUserHook(void (*fcn_ptr) (char *, long), int EventType)
 181 {
 182
 183         struct UserFunctionHook *newfcn;
 184
 185         newfcn = (struct UserFunctionHook *)
 186             mallok(sizeof(struct UserFunctionHook));
 187         newfcn->next = UserHookTable;
 188         newfcn->h_function_pointer = fcn_ptr;
 189         newfcn->eventtype = EventType;
 190         UserHookTable = newfcn;
 191
 192         lprintf(5, "Registered a new user function (type %d)\n",
 193                 EventType);
 194 }
 195
 196
 197 void CtdlRegisterXmsgHook(int (*fcn_ptr) (char *, char *, char *) )
 198 {
 199
 200         struct XmsgFunctionHook *newfcn;
 201
 202         newfcn = (struct XmsgFunctionHook *)
 203             mallok(sizeof(struct XmsgFunctionHook));
 204         newfcn->next = XmsgHookTable;
 205         newfcn->h_function_pointer = fcn_ptr;
 206         XmsgHookTable = newfcn;
 207
 208         lprintf(5, "Registered a new x-msg function\n");
 209 }
 210
 211
 212 void PerformSessionHooks(int EventType)
 213 {
 214         struct SessionFunctionHook *fcn;
 215
 216         for (fcn = SessionHookTable; fcn != NULL; fcn = fcn->next) {
 217                 if (fcn->eventtype == EventType) {
 218                         (*fcn->h_function_pointer) ();
 219                 }
 220         }
 221 }
 222
 223 void PerformLogHooks(int loglevel, char *logmsg)
 224 {
 225         struct LogFunctionHook *fcn;
 226
 227         for (fcn = LogHookTable; fcn != NULL; fcn = fcn->next) {
 228                 if (fcn->loglevel >= loglevel) {
 229                         (*fcn->h_function_pointer) (logmsg);
 230                 }
 231         }
 232 }
 233
 234 void PerformUserHooks(char *username, long usernum, int EventType)
 235 {
 236         struct UserFunctionHook *fcn;
 237
 238         for (fcn = UserHookTable; fcn != NULL; fcn = fcn->next) {
 239                 if (fcn->eventtype == EventType) {
 240                         (*fcn->h_function_pointer) (username, usernum);
 241                 }
 242         }
 243 }
 244
 245 int PerformXmsgHooks(char *sender, char *recp, char *msg)
 246 {
 247         struct XmsgFunctionHook *fcn;
 248         int total_sent = 0;
 249
 250         for (fcn = XmsgHookTable; fcn != NULL; fcn = fcn->next) {
 251                 total_sent +=
 252                         (*fcn->h_function_pointer) (sender, recp, msg);
 253         }
 254         return total_sent;
 255 }