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7ac48069 | 1 | /* $Id$ |
2 | * | |
3 | * Do RPC | |
a3cf6921 | 4 | * |
7ac48069 | 5 | * Copyright (C) 1987-1998 by the Massachusetts Institute of Technology |
6 | * For copying and distribution information, please see the file | |
7 | * <mit-copyright.h>. | |
a3cf6921 | 8 | * |
a3cf6921 | 9 | */ |
10 | ||
c801de4c | 11 | #include <mit-copyright.h> |
7ac48069 | 12 | #include "mr_server.h" |
13 | #include "query.h" | |
14 | ||
57c08162 | 15 | #include <sys/stat.h> |
7ac48069 | 16 | #include <sys/types.h> |
17 | ||
960b073b | 18 | #include <arpa/inet.h> |
7ac48069 | 19 | #include <netinet/in.h> |
20 | ||
78849033 | 21 | #include <errno.h> |
7ac48069 | 22 | #include <fcntl.h> |
23 | #include <stdlib.h> | |
24 | #include <string.h> | |
25 | #include <unistd.h> | |
26 | ||
27 | RCSID("$Header$"); | |
28 | ||
a3cf6921 | 29 | extern int nclients; |
85330553 | 30 | extern client **clients; |
a3cf6921 | 31 | extern char *whoami; |
32 | ||
03c05291 | 33 | extern int dbms_errno, mr_errcode; |
78543660 | 34 | |
7ac48069 | 35 | void do_call(client *cl); |
36 | void free_rtn_tuples(client *cp); | |
85330553 | 37 | int retr_callback(int argc, char **argv, void *p_cl); |
38 | int list_users(client *cl); | |
39 | void do_retr(client *cl, mr_params req); | |
40 | void do_access(client *cl, mr_params req); | |
7ac48069 | 41 | void get_motd(client *cl); |
42 | ||
78543660 | 43 | /* Put this in a variable so that we can patch it if necessary */ |
50e114e1 | 44 | int max_row_count = 4096; |
a3cf6921 | 45 | |
a3cf6921 | 46 | char *procnames[] = { |
5eaef520 | 47 | "noop", |
48 | "auth", | |
49 | "shutdown", | |
50 | "query", | |
51 | "access", | |
52 | "dcm", | |
53 | "motd", | |
630e8323 | 54 | }; |
55 | ||
85330553 | 56 | int newqueries; |
a3cf6921 | 57 | |
85330553 | 58 | void client_read(client *cl) |
a3cf6921 | 59 | { |
85330553 | 60 | mr_params req; |
61 | int status, pn; | |
62 | ||
63 | status = mr_receive(cl->con, &req); | |
64 | if (status != MR_SUCCESS) | |
5eaef520 | 65 | { |
85330553 | 66 | cl->done = 1; |
67 | if (status != MR_NOT_CONNECTED) | |
68 | com_err(whoami, status, "while reading from socket"); | |
5eaef520 | 69 | return; |
70 | } | |
85330553 | 71 | |
72 | pn = req.u.mr_procno; | |
73 | if (pn < 0 || pn > MR_MAX_PROC) | |
5eaef520 | 74 | { |
85330553 | 75 | com_err(whoami, 0, "procno out of range"); |
76 | client_reply(cl, MR_UNKNOWN_PROC); | |
77 | return; | |
5eaef520 | 78 | } |
85330553 | 79 | log_args(procnames[pn], 2, req.mr_argc, req.mr_argv); |
5eaef520 | 80 | |
85330553 | 81 | if (dormant == ASLEEP && pn != MR_NOOP && pn != MR_MOTD) |
5eaef520 | 82 | { |
85330553 | 83 | client_reply(cl, MR_DOWN); |
84 | com_err(whoami, MR_DOWN, "(query refused)"); | |
5eaef520 | 85 | return; |
86 | } | |
87 | ||
88 | /* make sure this gets cleared before every operation */ | |
89 | dbms_errno = 0; | |
90 | ||
91 | switch (pn) | |
92 | { | |
93 | case MR_NOOP: | |
85330553 | 94 | client_reply(cl, MR_SUCCESS); |
5eaef520 | 95 | return; |
96 | ||
97 | case MR_AUTH: | |
85330553 | 98 | do_auth(cl, req); |
5eaef520 | 99 | return; |
100 | ||
101 | case MR_QUERY: | |
85330553 | 102 | do_retr(cl, req); |
5eaef520 | 103 | return; |
104 | ||
105 | case MR_ACCESS: | |
85330553 | 106 | do_access(cl, req); |
5eaef520 | 107 | return; |
108 | ||
109 | case MR_SHUTDOWN: | |
110 | do_shutdown(cl); | |
111 | return; | |
112 | ||
113 | case MR_DO_UPDATE: | |
85330553 | 114 | client_reply(cl, MR_PERM); |
5eaef520 | 115 | return; |
116 | ||
117 | case MR_MOTD: | |
118 | get_motd(cl); | |
119 | return; | |
120 | } | |
a3cf6921 | 121 | } |
122 | ||
85330553 | 123 | /* Set the final return status for a query. We always keep one more |
124 | free slot in cl->tuples[] than we're using so that this can't fail */ | |
125 | void client_reply(client *cl, long status) | |
ed31e0d1 | 126 | { |
85330553 | 127 | cl->tuples[cl->ntuples].u.mr_status = status; |
128 | cl->tuples[cl->ntuples].mr_argc = 0; | |
129 | cl->tuples[cl->ntuples].mr_argl = NULL; | |
130 | cl->tuples[cl->ntuples].mr_argv = NULL; | |
131 | cl->ntuples++; | |
5eaef520 | 132 | } |
ed31e0d1 | 133 | |
85330553 | 134 | void client_return_tuple(client *cl, int argc, char **argv) |
78849033 | 135 | { |
85330553 | 136 | if (cl->done || dbms_errno) |
137 | return; | |
5eaef520 | 138 | |
85330553 | 139 | if (cl->ntuples == max_row_count) |
5eaef520 | 140 | { |
141 | dbms_errno = mr_errcode = MR_NO_MEM; | |
85330553 | 142 | return; |
5eaef520 | 143 | } |
144 | ||
85330553 | 145 | if (cl->ntuples == cl->tuplessize - 1) |
5eaef520 | 146 | { |
85330553 | 147 | int newsize = (cl->tuplessize + 4) * 2; |
148 | mr_params *newtuples; | |
149 | ||
150 | newtuples = realloc(cl->tuples, newsize * sizeof(mr_params)); | |
151 | if (!newtuples) | |
152 | { | |
153 | free_rtn_tuples(cl); | |
154 | dbms_errno = mr_errcode = MR_NO_MEM; | |
155 | return; | |
156 | } | |
157 | cl->tuplessize = newsize; | |
158 | cl->tuples = newtuples; | |
5eaef520 | 159 | } |
5eaef520 | 160 | |
85330553 | 161 | cl->tuples[cl->ntuples].u.mr_status = MR_MORE_DATA; |
162 | cl->tuples[cl->ntuples].mr_argc = argc; | |
163 | cl->tuples[cl->ntuples].mr_argl = NULL; | |
164 | cl->tuples[cl->ntuples].mr_argv = mr_copy_args(argv, argc); | |
165 | cl->ntuples++; | |
78849033 | 166 | } |
167 | ||
85330553 | 168 | void client_write(client *cl) |
de24f12d | 169 | { |
85330553 | 170 | int status; |
5eaef520 | 171 | |
85330553 | 172 | status = mr_send(cl->con, &cl->tuples[cl->nexttuple]); |
173 | if (status) | |
5eaef520 | 174 | { |
85330553 | 175 | com_err(whoami, status, "writing to socket"); |
176 | cl->done = 1; | |
177 | } | |
178 | else | |
179 | { | |
180 | cl->nexttuple++; | |
181 | if (cl->nexttuple == cl->ntuples) | |
182 | free_rtn_tuples(cl); | |
5eaef520 | 183 | } |
de24f12d | 184 | } |
78849033 | 185 | |
85330553 | 186 | void free_rtn_tuples(client *cl) |
a3cf6921 | 187 | { |
85330553 | 188 | for (cl->ntuples--; cl->ntuples >= 0; cl->ntuples--) |
189 | free_argv(cl->tuples[cl->ntuples].mr_argv, | |
190 | cl->tuples[cl->ntuples].mr_argc); | |
191 | free(cl->tuples); | |
192 | ||
193 | cl->tuples = xmalloc(sizeof(mr_params)); | |
194 | cl->tuplessize = 1; | |
195 | cl->ntuples = cl->nexttuple = 0; | |
196 | } | |
5eaef520 | 197 | |
85330553 | 198 | void do_retr(client *cl, mr_params req) |
199 | { | |
200 | char *queryname; | |
201 | int status; | |
5eaef520 | 202 | |
85330553 | 203 | if (req.mr_argc < 1) |
5eaef520 | 204 | { |
85330553 | 205 | client_reply(cl, MR_ARGS); |
5eaef520 | 206 | com_err(whoami, MR_ARGS, "got nameless query"); |
207 | return; | |
208 | } | |
85330553 | 209 | queryname = req.mr_argv[0]; |
210 | newqueries++; | |
5eaef520 | 211 | |
212 | if (!strcmp(queryname, "_list_users")) | |
85330553 | 213 | status = list_users(cl); |
5eaef520 | 214 | else |
85330553 | 215 | status = mr_process_query(cl, queryname, req.mr_argc - 1, req.mr_argv + 1, |
216 | retr_callback, cl); | |
217 | ||
218 | client_reply(cl, status); | |
219 | ||
220 | if (cl->ntuples >= max_row_count) | |
5eaef520 | 221 | { |
85330553 | 222 | critical_alert("moirad", "attempted query %s with too many rows\n", |
223 | queryname); | |
5eaef520 | 224 | } |
225 | ||
85330553 | 226 | com_err(whoami, 0, "Query complete."); |
227 | } | |
228 | ||
229 | int retr_callback(int argc, char **argv, void *p_cl) | |
230 | { | |
231 | client *cl = p_cl; | |
232 | ||
233 | mr_trim_args(argc, argv); | |
234 | client_return_tuple(cl, argc, argv); | |
a3cf6921 | 235 | } |
78849033 | 236 | |
85330553 | 237 | void do_access(client *cl, mr_params req) |
3630192b | 238 | { |
85330553 | 239 | int status; |
240 | ||
241 | if (req.mr_argc < 1) | |
5eaef520 | 242 | { |
85330553 | 243 | client_reply(cl, MR_ARGS); |
5eaef520 | 244 | com_err(whoami, MR_ARGS, "got nameless access"); |
245 | return; | |
246 | } | |
5eaef520 | 247 | |
85330553 | 248 | status = mr_check_access(cl, req.mr_argv[0], req. mr_argc - 1, |
249 | req.mr_argv + 1); | |
250 | client_reply(cl, status); | |
5eaef520 | 251 | |
252 | com_err(whoami, 0, "Access check complete."); | |
3630192b | 253 | } |
8165c536 | 254 | |
85330553 | 255 | void get_motd(client *cl) |
8165c536 | 256 | { |
85330553 | 257 | int motd; |
258 | char *buffer; | |
259 | struct stat statb; | |
5eaef520 | 260 | |
85330553 | 261 | if (stat(MOIRA_MOTD_FILE, &statb) == -1) |
5eaef520 | 262 | { |
85330553 | 263 | client_reply(cl, MR_SUCCESS); |
264 | return; | |
265 | } | |
266 | ||
267 | buffer = malloc(statb.st_size + 1); | |
268 | if (!buffer) | |
269 | { | |
270 | client_reply(cl, MR_NO_MEM); | |
271 | return; | |
272 | } | |
5eaef520 | 273 | |
85330553 | 274 | motd = open(MOIRA_MOTD_FILE, 0, O_RDONLY); |
275 | if (motd) | |
276 | { | |
277 | read(motd, buffer, statb.st_size); | |
278 | close(motd); | |
279 | buffer[statb.st_size] = '\0'; | |
280 | client_return_tuple(cl, 1, &buffer); | |
281 | client_reply(cl, MR_SUCCESS); | |
5eaef520 | 282 | } |
85330553 | 283 | else |
284 | client_reply(cl, errno); | |
8165c536 | 285 | |
85330553 | 286 | free(buffer); |
287 | } | |
57c08162 | 288 | |
85330553 | 289 | int list_users(client *cl) |
57c08162 | 290 | { |
85330553 | 291 | char *argv[5]; |
292 | char buf[30]; | |
293 | char buf1[30]; | |
294 | int i; | |
295 | char *cp; | |
5eaef520 | 296 | |
85330553 | 297 | for (i = 0; i < nclients; i++) |
298 | { | |
299 | client *c = clients[i]; | |
300 | argv[0] = c->clname; | |
301 | argv[1] = inet_ntoa(c->haddr.sin_addr); | |
302 | argv[2] = buf; | |
303 | sprintf(buf, "port %d", ntohs(c->haddr.sin_port)); | |
304 | argv[3] = ctime(&c->last_time_used); | |
305 | cp = strchr(argv[3], '\n'); | |
306 | if (cp) | |
307 | *cp = '\0'; | |
308 | argv[4] = buf1; | |
309 | sprintf(buf1, "[#%d]", c->id); | |
310 | client_return_tuple(cl, 5, argv); | |
311 | } | |
312 | return MR_SUCCESS; | |
57c08162 | 313 | } |
85330553 | 314 |