1: /*************************************************************************
2: * (C) 2010 AITNET ltd - Sofia/Bulgaria - <misho@aitbg.com>
3: * by Michael Pounov <misho@openbsd-bg.org>
4: *
5: * $Author: misho $
6: * $Id: cli.c,v 1.9.2.9 2012/05/17 14:22:24 misho Exp $
7: *
8: **************************************************************************
9: The ELWIX and AITNET software is distributed under the following
10: terms:
11:
12: All of the documentation and software included in the ELWIX and AITNET
13: Releases is copyrighted by ELWIX - Sofia/Bulgaria <info@elwix.org>
14:
15: Copyright 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012
16: by Michael Pounov <misho@elwix.org>. All rights reserved.
17:
18: Redistribution and use in source and binary forms, with or without
19: modification, are permitted provided that the following conditions
20: are met:
21: 1. Redistributions of source code must retain the above copyright
22: notice, this list of conditions and the following disclaimer.
23: 2. Redistributions in binary form must reproduce the above copyright
24: notice, this list of conditions and the following disclaimer in the
25: documentation and/or other materials provided with the distribution.
26: 3. All advertising materials mentioning features or use of this software
27: must display the following acknowledgement:
28: This product includes software developed by Michael Pounov <misho@elwix.org>
29: ELWIX - Embedded LightWeight unIX and its contributors.
30: 4. Neither the name of AITNET nor the names of its contributors
31: may be used to endorse or promote products derived from this software
32: without specific prior written permission.
33:
34: THIS SOFTWARE IS PROVIDED BY AITNET AND CONTRIBUTORS ``AS IS'' AND
35: ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
36: IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
37: ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
38: FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
39: DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
40: OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
41: HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
42: LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
43: OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
44: SUCH DAMAGE.
45: */
46: #include "global.h"
47:
48:
49: /*
50: * rpc_cli_openBLOBClient() - Connect to BLOB Server
51: *
52: * @rpccli = RPC Client session
53: * @Port = Port for bind server, if Port == 0 default port is selected
54: * return: NULL == error or !=NULL connection to BLOB server established
55: */
56: rpc_cli_t *
57: rpc_cli_openBLOBClient(rpc_cli_t * __restrict rpccli, u_short Port)
58: {
59: rpc_cli_t *cli = NULL;
60:
61: if (!rpccli) {
62: rpc_SetErr(EINVAL, "Invalid parameters can`t connect to BLOB server");
63: return NULL;
64: }
65:
66: cli = malloc(sizeof(rpc_cli_t));
67: if (!cli) {
68: LOGERR;
69: return NULL;
70: } else
71: memcpy(cli, rpccli, sizeof(rpc_cli_t));
72:
73: memcpy(&cli->cli_sa, &rpccli->cli_sa, sizeof(io_sockaddr_t));
74: switch (cli->cli_sa.sa.sa_family) {
75: case AF_INET:
76: cli->cli_sa.sin.sin_port =
77: htons(Port ? Port : ntohs(cli->cli_sa.sin.sin_port) + 1);
78: break;
79: case AF_INET6:
80: cli->cli_sa.sin6.sin6_port =
81: htons(Port ? Port : ntohs(cli->cli_sa.sin6.sin6_port) + 1);
82: break;
83: case AF_LOCAL:
84: strlcat(cli->cli_sa.sun.sun_path, ".blob", sizeof cli->cli_sa.sun.sun_path);
85: break;
86: default:
87: rpc_SetErr(EINVAL, "Invalid socket type %d", cli->cli_sa.sa.sa_family);
88: return NULL;
89: }
90:
91: AIT_COPY_VAL(&cli->cli_buf, &rpccli->cli_buf);
92:
93: /* connect to BLOB server */
94: cli->cli_sock = socket(cli->cli_sa.sa.sa_family, SOCK_STREAM, 0);
95: if (cli->cli_sock == -1) {
96: LOGERR;
97: free(cli);
98: return NULL;
99: }
100: if (connect(cli->cli_sock, &cli->cli_sa.sa, cli->cli_sa.sa.sa_len) == -1) {
101: LOGERR;
102: close(cli->cli_sock);
103: free(cli);
104: return NULL;
105: }
106:
107: return cli;
108: }
109:
110: /*
111: * rpc_cli_closeBLOBClient() - Close connection to BLOB server and free resources
112: *
113: * @cli = BLOB Client session
114: * return: none
115: */
116: void
117: rpc_cli_closeBLOBClient(rpc_cli_t ** __restrict cli)
118: {
119: if (!cli || !*cli)
120: return;
121:
122: shutdown((*cli)->cli_sock, SHUT_RDWR);
123: close((*cli)->cli_sock);
124:
125: AIT_FREE_VAL(&(*cli)->cli_buf);
126:
127: free(*cli);
128: *cli = NULL;
129: }
130:
131: /* -------------------------------------------------------------- */
132:
133: /*
134: * rpc_cli_openClient() - Connect to RPC Server
135: *
136: * @ProgID = ProgramID for RPC session request
137: * @ProcID = ProcessID for RPC session request
138: * @netBuf = Network buffer length, if =0 == BUFSIZ (also meaning max RPC packet)
139: * @csHost = Host name or IP address for bind server
140: * @Port = Port for bind server, if Port == 0 default port is selected
141: * return: NULL == error or !=NULL connection to RPC server established
142: */
143: rpc_cli_t *
144: rpc_cli_openClient(u_int ProgID, u_char ProcID, int netBuf, const char *csHost, u_short Port)
145: {
146: rpc_cli_t *cli = NULL;
147: io_sockaddr_t sa;
148:
149: if (!io_gethostbyname(csHost, Port, &sa))
150: return NULL;
151: if (!Port)
152: Port = RPC_DEFPORT;
153: if (!netBuf)
154: netBuf = BUFSIZ;
155:
156: #ifdef HAVE_SRANDOMDEV
157: srandomdev();
158: #else
159: time_t tim;
160:
161: srandom((time(&tim) ^ getpid()));
162: #endif
163:
164: cli = malloc(sizeof(rpc_cli_t));
165: if (!cli) {
166: LOGERR;
167: return NULL;
168: } else
169: memset(cli, 0, sizeof(rpc_cli_t));
170:
171: /* build session */
172: cli->cli_parent = malloc(sizeof(rpc_sess_t));
173: if (!cli->cli_parent) {
174: LOGERR;
175: free(cli);
176: return NULL;
177: } else {
178: ((rpc_sess_t*) cli->cli_parent)->sess_version = RPC_VERSION;
179: ((rpc_sess_t*) cli->cli_parent)->sess_program = ProgID;
180: ((rpc_sess_t*) cli->cli_parent)->sess_process = ProcID;
181: }
182:
183: memcpy(&cli->cli_sa, &sa, sizeof cli->cli_sa);
184: AIT_SET_BUF2(&cli->cli_buf, 0, netBuf);
185:
186: /* connect to RPC server */
187: cli->cli_sock = socket(cli->cli_sa.sa.sa_family, SOCK_STREAM, 0);
188: if (cli->cli_sock == -1) {
189: LOGERR;
190: AIT_FREE_VAL(&cli->cli_buf);
191: free(cli->cli_parent);
192: free(cli);
193: return NULL;
194: }
195: if (connect(cli->cli_sock, &cli->cli_sa.sa, cli->cli_sa.sa.sa_len) == -1) {
196: LOGERR;
197: AIT_FREE_VAL(&cli->cli_buf);
198: close(cli->cli_sock);
199: free(cli->cli_parent);
200: free(cli);
201: return NULL;
202: }
203:
204: return cli;
205: }
206:
207: /*
208: * rpc_cli_closeClient() - Close connection to RPC server and free resources
209: *
210: * @cli = RPC Client session
211: * return: none
212: */
213: void
214: rpc_cli_closeClient(rpc_cli_t ** __restrict cli)
215: {
216: if (!cli || !*cli)
217: return;
218:
219: shutdown((*cli)->cli_sock, SHUT_RDWR);
220: close((*cli)->cli_sock);
221:
222: AIT_FREE_VAL(&(*cli)->cli_buf);
223:
224: if ((*cli)->cli_parent)
225: free((*cli)->cli_parent);
226:
227: free(*cli);
228: *cli = NULL;
229: }
230:
231:
232: /*
233: * rpc_cli_execCall() - Execute RPC call
234: *
235: * @cli = RPC Client session
236: * @noreply = We not want RPC reply
237: * @tag = Function tag for execution
238: * @in_vars = IN RPC call array of rpc values, may be NULL
239: * @out_vars = OUT returned array of rpc values, if !=NULL must be free after use with io_freeVars()
240: * return: -1 error or != -1 ok result
241: */
242: int
243: rpc_cli_execCall(rpc_cli_t *cli, int noreply, u_short tag,
244: array_t * __restrict in_vars, array_t ** __restrict out_vars)
245: {
246: struct tagRPCCall *rpc;
247: int ret = 0, wlen = sizeof(struct tagRPCCall);
248: uint16_t crc;
249: u_char *buf;
250: struct pollfd pfd;
251:
252: if (!cli) {
253: rpc_SetErr(EINVAL, "Can`t execute call because parameter is null or invalid!");
254: return -1;
255: } else
256: buf = AIT_GET_BUF(&cli->cli_buf);
257: if (out_vars)
258: *out_vars = NULL;
259:
260: /* prepare RPC call */
261: rpc = (struct tagRPCCall*) buf;
262: rpc_addPktSession(&rpc->call_session, cli->cli_parent);
263: rpc->call_argc = htons(io_arraySize(in_vars));
264: rpc->call_tag = htons(tag);
265: rpc->call_seq = htons(random() % USHRT_MAX);
266:
267: /* set reply */
268: rpc->call_req.flags = noreply ? RPC_NOREPLY : RPC_REPLY;
269:
270: if (io_arraySize(in_vars)) {
271: /* marshaling variables */
272: ret = io_vars2buffer(buf + wlen, AIT_LEN(&cli->cli_buf) - wlen, in_vars);
273: if (ret == -1) {
274: rpc_SetErr(EBADRPC, "Failed to prepare RPC packet values");
275: return -1;
276: } else
277: wlen += ret;
278: }
279:
280: /* total packet length */
281: rpc->call_len = htons(wlen);
282:
283: /* calculate CRC */
284: rpc->call_crc ^= rpc->call_crc;
285: rpc->call_crc = htons(crcFletcher16((u_short*) buf, wlen / 2));
286:
287: if ((ret = send(cli->cli_sock, buf, wlen, MSG_NOSIGNAL)) == -1) {
288: LOGERR;
289: return -1;
290: } else if (ret != wlen) {
291: rpc_SetErr(EPROCUNAVAIL, "RPC request, should be send %d bytes, "
292: "really sended %d bytes", wlen, ret);
293: return -1;
294: }
295:
296: if (noreply) /* we not want reply */
297: return 0;
298:
299: /* reply from RPC server */
300: pfd.fd = cli->cli_sock;
301: pfd.events = POLLIN | POLLPRI;
302: if ((ret = poll(&pfd, 1, DEF_RPC_TIMEOUT * 1000)) == -1 ||
303: pfd.revents & (POLLERR | POLLHUP | POLLNVAL)) {
304: if (ret)
305: LOGERR;
306: else
307: rpc_SetErr(ETIMEDOUT, "Timeout, no answer from RPC server");
308:
309: return -1;
310: }
311: memset(buf, 0, AIT_LEN(&cli->cli_buf));
312: if ((ret = recv(cli->cli_sock, buf, AIT_LEN(&cli->cli_buf), 0)) < 1) {
313: if (ret)
314: LOGERR;
315: return -1;
316: }
317: if (ret < sizeof(struct tagRPCCall)) {
318: rpc_SetErr(ERPCMISMATCH, "Short RPC packet");
319: return -1;
320: }
321:
322: /* calculate CRC */
323: crc = ntohs(rpc->call_crc);
324: rpc->call_crc ^= rpc->call_crc;
325: if (crc != crcFletcher16((u_short*) buf, ret / 2)) {
326: rpc_SetErr(ERPCMISMATCH, "Bad CRC RPC packet");
327: return -1;
328: }
329:
330: /* check RPC packet session info */
331: if (rpc_chkPktSession(&rpc->call_session, cli->cli_parent)) {
332: rpc_SetErr(ERPCMISMATCH, "Get invalid RPC session");
333: return -1;
334: } else
335: wlen = sizeof(struct tagRPCCall);
336: if (ntohs(rpc->call_tag) != tag) {
337: rpc_SetErr(ERPCMISMATCH, "Get wrong RPC reply");
338: return -1;
339: }
340: if (ntohl(rpc->call_rep.eno) && ntohl(rpc->call_rep.ret) == -1) {
341: rpc_SetErr(ntohl(rpc->call_rep.eno), "Server side: retcode=%d #%d %s",
342: ntohl(rpc->call_rep.ret), ntohl(rpc->call_rep.eno),
343: strerror(ntohl(rpc->call_rep.eno)));
344: return -1;
345: }
346: if (ntohs(rpc->call_argc) * sizeof(ait_val_t) > AIT_LEN(&cli->cli_buf) - wlen) {
347: rpc_SetErr(EMSGSIZE, "Reply RPC packet is too long ...");
348: return -1;
349: }
350:
351: /* RPC is OK! Go de-marshaling variables ... */
352: if (out_vars && ntohs(rpc->call_argc)) {
353: *out_vars = io_buffer2vars(buf + wlen, AIT_LEN(&cli->cli_buf) - wlen,
354: ntohs(rpc->call_argc), 0);
355: if (!*out_vars) {
356: rpc_SetErr(io_GetErrno(), "%s", io_GetError());
357: return -1;
358: }
359: }
360:
361: ret = ntohl(rpc->call_rep.ret);
362: return ret;
363: }
364:
365: /*
366: * rpc_cli_ping() - Ping RPC server
367: *
368: * @cli = connected client
369: * return: -1 error or !=-1 ping seq id
370: */
371: inline int
372: rpc_cli_ping(rpc_cli_t *cli)
373: {
374: array_t *arr;
375: int ret = 0;
376:
377: if (!cli)
378: return -1;
379:
380: if (rpc_cli_execCall(cli, RPC_REPLY, CALL_SRVPING, NULL, &arr))
381: return -1;
382: else
383: ret = AIT_GET_U16(io_getVars(arr, 0));
384: io_freeVars(&arr);
385:
386: return ret;
387: }
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