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0fa91a0a | 1 | /* |
2 | * $Source$ | |
3 | * $Author$ | |
4 | * $Header$ | |
5 | * | |
6 | * Copyright (C) 1987 by the Massachusetts Institute of Technology | |
7 | * | |
8 | * | |
9 | * SMS server process. | |
10 | * | |
11 | * Most of this is stolen from ../gdb/tsr.c | |
12 | * | |
13 | * You are in a maze of twisty little finite automata, all different. | |
14 | * Let the reader beware. | |
15 | * | |
16 | * $Log$ | |
f6cc38de | 17 | * Revision 1.6 1987-06-03 17:41:00 wesommer |
18 | * Added startup support. | |
0fa91a0a | 19 | * |
f6cc38de | 20 | * Revision 1.5 87/06/03 16:07:17 wesommer |
21 | * Fixes for lint. | |
22 | * | |
5dbd09a0 | 23 | * Revision 1.4 87/06/02 20:05:11 wesommer |
24 | * Bug fixes on memory allocation. | |
25 | * | |
0ec57336 | 26 | * Revision 1.3 87/06/01 04:34:27 wesommer |
27 | * Changed returned error code. | |
28 | * | |
d9ecb02a | 29 | * Revision 1.2 87/06/01 03:34:53 wesommer |
30 | * Added shutdown, logging. | |
31 | * | |
70d54e43 | 32 | * Revision 1.1 87/05/31 22:06:56 wesommer |
33 | * Initial revision | |
34 | * | |
0fa91a0a | 35 | */ |
36 | ||
0fa91a0a | 37 | static char *rcsid_sms_main_c = "$Header$"; |
0fa91a0a | 38 | |
70d54e43 | 39 | #include <strings.h> |
40 | #include <sys/errno.h> | |
70d54e43 | 41 | #include <sys/signal.h> |
0fa91a0a | 42 | #include "sms_private.h" |
43 | #include "sms_server.h" | |
70d54e43 | 44 | |
0ec57336 | 45 | extern CONNECTION newconn, listencon; |
0fa91a0a | 46 | |
0ec57336 | 47 | extern int nclients; |
48 | extern client **clients, *cur_client; | |
0fa91a0a | 49 | |
0ec57336 | 50 | extern OPERATION listenop; |
51 | extern LIST_OF_OPERATIONS op_list; | |
0fa91a0a | 52 | |
0ec57336 | 53 | extern struct sockaddr_in client_addr; |
54 | extern int client_addrlen; | |
55 | extern TUPLE client_tuple; | |
0fa91a0a | 56 | |
0ec57336 | 57 | extern char *whoami; |
58 | extern char buf1[BUFSIZ]; | |
59 | extern char *takedown; | |
60 | extern int errno; | |
0fa91a0a | 61 | |
70d54e43 | 62 | |
0ec57336 | 63 | extern char *malloc(); |
64 | extern char *inet_ntoa(); | |
65 | extern void sms_com_err(); | |
66 | extern void do_client(); | |
70d54e43 | 67 | |
0ec57336 | 68 | extern int sigshut(); |
69 | void clist_append(); | |
70 | void oplist_append(); | |
71 | extern u_short ntohs(); | |
0fa91a0a | 72 | |
0ec57336 | 73 | /* |
74 | * Main SMS server loop. | |
75 | * | |
76 | * Initialize the world, then start accepting connections and | |
77 | * making progress on current connections. | |
78 | */ | |
0fa91a0a | 79 | |
0ec57336 | 80 | /*ARGSUSED*/ |
81 | int | |
0fa91a0a | 82 | main(argc, argv) |
70d54e43 | 83 | int argc; |
84 | char **argv; | |
0fa91a0a | 85 | { |
0ec57336 | 86 | int status; |
87 | ||
88 | whoami = argv[0]; | |
89 | /* | |
90 | * Error handler init. | |
91 | */ | |
92 | init_sms_err_tbl(); | |
93 | init_krb_err_tbl(); | |
94 | set_com_err_hook(sms_com_err); | |
95 | ||
96 | if (argc != 1) { | |
97 | com_err(whoami, 0, "Usage: smsd"); | |
98 | exit(1); | |
99 | } | |
100 | ||
101 | /* | |
102 | * GDB initialization. | |
103 | */ | |
5dbd09a0 | 104 | if(gdb_init() != 0) { |
105 | com_err(whoami, 0, "GDB initialization failed."); | |
106 | exit(1); | |
107 | } | |
0ec57336 | 108 | |
f6cc38de | 109 | /* |
110 | * Database initialization. | |
111 | */ | |
112 | ||
113 | if ((status = sms_open_database()) != 0) { | |
114 | com_err(whoami, status, "when trying to open database."); | |
115 | exit(1); | |
116 | } | |
117 | ||
0ec57336 | 118 | /* |
119 | * Set up client array handler. | |
120 | */ | |
0fa91a0a | 121 | nclients = 0; |
122 | clients = (client **) malloc(0); | |
70d54e43 | 123 | |
0ec57336 | 124 | /* |
125 | * Signal handlers | |
f6cc38de | 126 | * There should probably be a few more of these. |
0ec57336 | 127 | */ |
70d54e43 | 128 | |
0ec57336 | 129 | if ((((int)signal (SIGTERM, sigshut)) < 0) || |
130 | (((int)signal (SIGHUP, sigshut)) < 0)) { | |
131 | com_err(whoami, errno, "Unable to establish signal handler."); | |
132 | exit(1); | |
133 | } | |
134 | ||
135 | /* | |
136 | * Establish template connection. | |
137 | */ | |
138 | if ((status = do_listen()) != 0) { | |
139 | com_err(whoami, status, | |
140 | "while trying to create listening connection"); | |
141 | exit(1); | |
142 | } | |
0fa91a0a | 143 | |
0fa91a0a | 144 | op_list = create_list_of_operations(1, listenop); |
0fa91a0a | 145 | |
0ec57336 | 146 | (void) sprintf(buf1, "started (pid %d)", getpid()); |
147 | com_err(whoami, 0, buf1); | |
148 | com_err(whoami, 0, rcsid_sms_main_c); | |
149 | ||
150 | /* | |
151 | * Run until shut down. | |
152 | */ | |
70d54e43 | 153 | while(!takedown) { |
0ec57336 | 154 | register int i; |
155 | /* | |
156 | * Block until something happens. | |
157 | */ | |
5dbd09a0 | 158 | #ifdef notdef |
159 | com_err(whoami, 0, "tick"); | |
160 | #endif notdef | |
161 | errno = 0; | |
162 | status = op_select_any(op_list, 0, | |
163 | (fd_set *)NULL, (fd_set *)NULL, | |
164 | (fd_set *)NULL, (struct timeval *)NULL); | |
165 | ||
166 | if (status == -1) { | |
167 | com_err(whoami, errno, "error from op_select"); | |
168 | continue; | |
169 | } else if (status != -2) { | |
170 | com_err(whoami, 0, "wrong return from op_select_any"); | |
171 | continue; | |
172 | } | |
70d54e43 | 173 | if (takedown) break; |
174 | #ifdef notdef | |
175 | fprintf(stderr, " tick\n"); | |
176 | #endif notdef | |
0ec57336 | 177 | /* |
178 | * Handle any existing connections. | |
179 | */ | |
0fa91a0a | 180 | for (i=0; i<nclients; i++) { |
181 | if (OP_DONE(clients[i]->pending_op)) { | |
70d54e43 | 182 | cur_client = clients[i]; |
183 | do_client(cur_client); | |
184 | cur_client = NULL; | |
185 | if (takedown) break; | |
0fa91a0a | 186 | } |
187 | } | |
0ec57336 | 188 | /* |
189 | * Handle any new connections. | |
190 | */ | |
191 | if (OP_DONE(listenop)) { | |
5dbd09a0 | 192 | if ((status = new_connection()) != 0) { |
0ec57336 | 193 | com_err(whoami, errno, |
194 | "Error on listening operation."); | |
195 | /* | |
196 | * Sleep here to prevent hosing? | |
197 | */ | |
198 | } | |
199 | } | |
0fa91a0a | 200 | } |
70d54e43 | 201 | com_err(whoami, 0, takedown); |
f6cc38de | 202 | sms_close_database(); |
0ec57336 | 203 | return 0; |
70d54e43 | 204 | } |
205 | ||
0ec57336 | 206 | /* |
207 | * Set up the template connection and queue the first accept. | |
208 | */ | |
209 | ||
210 | int | |
211 | do_listen() | |
70d54e43 | 212 | { |
0ec57336 | 213 | char *service = index(SMS_GDB_SERV, ':') + 1; |
214 | ||
215 | listencon = create_listening_connection(service); | |
216 | ||
217 | if (listencon == NULL) | |
218 | return errno; | |
219 | ||
220 | listenop = create_operation(); | |
221 | client_addrlen = sizeof(client_addr); | |
222 | ||
223 | start_accepting_client(listencon, listenop, &newconn, | |
224 | (char *)&client_addr, | |
225 | &client_addrlen, &client_tuple); | |
226 | return 0; | |
0fa91a0a | 227 | } |
228 | ||
0ec57336 | 229 | /* |
230 | * This routine is called when a new connection comes in. | |
231 | * | |
232 | * It sets up a new client and adds it to the list of currently active clients. | |
233 | */ | |
234 | int | |
5dbd09a0 | 235 | new_connection() |
0fa91a0a | 236 | { |
237 | register client *cp = (client *)malloc(sizeof *cp); | |
70d54e43 | 238 | static counter = 0; |
0fa91a0a | 239 | |
0fa91a0a | 240 | /* |
241 | * Make sure there's been no error | |
242 | */ | |
243 | if(OP_STATUS(listenop) != OP_COMPLETE || | |
244 | newconn == NULL) { | |
0ec57336 | 245 | return errno; |
246 | #ifdef notdef | |
70d54e43 | 247 | exit(8); /* XXX */ |
0ec57336 | 248 | #endif notdef |
0fa91a0a | 249 | } |
250 | ||
0fa91a0a | 251 | /* |
252 | * Set up the new connection and reply to the client | |
253 | */ | |
254 | ||
255 | cp->state = CL_STARTING; | |
256 | cp->action = CL_ACCEPT; | |
257 | cp->con = newconn; | |
70d54e43 | 258 | cp->id = counter++; |
0ec57336 | 259 | cp->args = NULL; |
260 | cp->clname = NULL; | |
261 | cp->reply.sms_argv = NULL; | |
262 | ||
0fa91a0a | 263 | newconn = NULL; |
264 | ||
265 | cp->pending_op = create_operation(); | |
266 | reset_operation(cp->pending_op); | |
267 | oplist_append(&op_list, cp->pending_op); | |
70d54e43 | 268 | cur_client = cp; |
269 | ||
0ec57336 | 270 | /* |
271 | * Add a new client to the array.. | |
272 | */ | |
273 | clist_append(cp); | |
274 | ||
275 | /* | |
276 | * Let him know we heard him. | |
277 | */ | |
0fa91a0a | 278 | start_replying_to_client(cp->pending_op, cp->con, GDB_ACCEPTED, |
279 | "", ""); | |
0ec57336 | 280 | |
281 | cp->haddr = client_addr; | |
282 | ||
283 | /* | |
284 | * Log new connection. | |
285 | */ | |
286 | ||
287 | (void) sprintf(buf1, | |
288 | "New connection from %s port %d (now %d client%s)", | |
289 | inet_ntoa(cp->haddr.sin_addr), | |
290 | (int)ntohs(cp->haddr.sin_port), | |
291 | nclients, | |
292 | nclients!=1?"s":""); | |
293 | com_err(whoami, 0, buf1); | |
0fa91a0a | 294 | |
295 | /* | |
0ec57336 | 296 | * Get ready to accept the next connection. |
0fa91a0a | 297 | */ |
298 | reset_operation(listenop); | |
0ec57336 | 299 | client_addrlen = sizeof(client_addr); |
0fa91a0a | 300 | |
301 | start_accepting_client(listencon, listenop, &newconn, | |
0ec57336 | 302 | (char *)&client_addr, |
303 | &client_addrlen, &client_tuple); | |
304 | return 0; | |
0fa91a0a | 305 | } |
306 | ||
0fa91a0a | 307 | /* |
308 | * Add a new client to the known clients. | |
309 | */ | |
0ec57336 | 310 | void |
0fa91a0a | 311 | clist_append(cp) |
312 | client *cp; | |
313 | { | |
314 | client **clients_n; | |
315 | ||
316 | nclients++; | |
0ec57336 | 317 | clients_n = (client **)malloc |
318 | ((unsigned)(nclients * sizeof(client *))); | |
0fa91a0a | 319 | bcopy((char *)clients, (char *)clients_n, (nclients-1)*sizeof(cp)); |
320 | clients_n[nclients-1] = cp; | |
321 | free((char *)clients); | |
322 | clients = clients_n; | |
323 | clients_n = NULL; | |
324 | } | |
325 | ||
70d54e43 | 326 | |
0ec57336 | 327 | void |
70d54e43 | 328 | clist_delete(cp) |
329 | client *cp; | |
330 | { | |
70d54e43 | 331 | client **clients_n, **scpp, **dcpp; /* source and dest client */ |
332 | /* ptr ptr */ | |
333 | ||
70d54e43 | 334 | int found_it = 0; |
335 | ||
0ec57336 | 336 | clients_n = (client **)malloc |
337 | ((unsigned)((nclients - 1)* sizeof(client *))); | |
70d54e43 | 338 | for (scpp = clients, dcpp = clients_n; scpp < clients+nclients; ) { |
339 | if (*scpp != cp) { | |
340 | *dcpp++ = *scpp++; | |
341 | } else { | |
342 | scpp++; | |
343 | if (found_it) abort(); | |
344 | found_it = 1; | |
345 | } | |
346 | } | |
347 | --nclients; | |
348 | free((char *)clients); | |
349 | clients = clients_n; | |
350 | clients_n = NULL; | |
351 | ||
352 | reset_operation(cp->pending_op); | |
353 | delete_operation(cp->pending_op); | |
0ec57336 | 354 | free((char *)cp); |
70d54e43 | 355 | } |
0ec57336 | 356 | |
0fa91a0a | 357 | /* |
0ec57336 | 358 | * Add a new operation to a list of operations. |
359 | * | |
360 | * This should be rewritten to use realloc instead, since in most | |
361 | * cases it won't have to copy the array. | |
0fa91a0a | 362 | */ |
363 | ||
0ec57336 | 364 | void |
0fa91a0a | 365 | oplist_append(oplp, op) |
366 | LIST_OF_OPERATIONS *oplp; | |
367 | OPERATION op; | |
368 | { | |
369 | int count = (*oplp)->count+1; | |
370 | LIST_OF_OPERATIONS newlist = (LIST_OF_OPERATIONS) | |
371 | db_alloc(size_of_list_of_operations(count)); | |
372 | bcopy((char *)(*oplp), (char *)newlist, | |
373 | size_of_list_of_operations((*oplp)->count)); | |
0fa91a0a | 374 | newlist->count++; |
375 | newlist->op[count-1] = op; | |
376 | db_free((*oplp), size_of_list_of_operations(count-1)); | |
377 | (*oplp) = newlist; | |
378 | } | |
379 |