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 1.9.2.10 2012/05/17 15:14:16 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: } else
106: fcntl(cli->cli_sock, F_SETFL, fcntl(cli->cli_sock, F_GETFL) | O_NONBLOCK);
107:
108: return cli;
109: }
110:
111: /*
112: * rpc_cli_closeBLOBClient() - Close connection to BLOB server and free resources
113: *
114: * @cli = BLOB Client session
115: * return: none
116: */
117: void
118: rpc_cli_closeBLOBClient(rpc_cli_t ** __restrict cli)
119: {
120: if (!cli || !*cli)
121: return;
122:
123: shutdown((*cli)->cli_sock, SHUT_RDWR);
124: close((*cli)->cli_sock);
125:
126: AIT_FREE_VAL(&(*cli)->cli_buf);
127:
128: free(*cli);
129: *cli = NULL;
130: }
131:
132: /* -------------------------------------------------------------- */
133:
134: /*
135: * rpc_cli_openClient() - Connect to RPC Server
136: *
137: * @ProgID = ProgramID for RPC session request
138: * @ProcID = ProcessID for RPC session request
139: * @netBuf = Network buffer length, if =0 == BUFSIZ (also meaning max RPC packet)
140: * @csHost = Host name or IP address for bind server
141: * @Port = Port for bind server, if Port == 0 default port is selected
142: * return: NULL == error or !=NULL connection to RPC server established
143: */
144: rpc_cli_t *
145: rpc_cli_openClient(u_int ProgID, u_char ProcID, int netBuf, const char *csHost, u_short Port)
146: {
147: rpc_cli_t *cli = NULL;
148: io_sockaddr_t sa;
149:
150: if (!io_gethostbyname(csHost, Port, &sa))
151: return NULL;
152: if (!Port)
153: Port = RPC_DEFPORT;
154: if (!netBuf)
155: netBuf = BUFSIZ;
156:
157: #ifdef HAVE_SRANDOMDEV
158: srandomdev();
159: #else
160: time_t tim;
161:
162: srandom((time(&tim) ^ getpid()));
163: #endif
164:
165: cli = malloc(sizeof(rpc_cli_t));
166: if (!cli) {
167: LOGERR;
168: return NULL;
169: } else
170: memset(cli, 0, sizeof(rpc_cli_t));
171:
172: /* build session */
173: cli->cli_parent = malloc(sizeof(rpc_sess_t));
174: if (!cli->cli_parent) {
175: LOGERR;
176: free(cli);
177: return NULL;
178: } else {
179: ((rpc_sess_t*) cli->cli_parent)->sess_version = RPC_VERSION;
180: ((rpc_sess_t*) cli->cli_parent)->sess_program = ProgID;
181: ((rpc_sess_t*) cli->cli_parent)->sess_process = ProcID;
182: }
183:
184: memcpy(&cli->cli_sa, &sa, sizeof cli->cli_sa);
185: AIT_SET_BUF2(&cli->cli_buf, 0, netBuf);
186:
187: /* connect to RPC server */
188: cli->cli_sock = socket(cli->cli_sa.sa.sa_family, SOCK_STREAM, 0);
189: if (cli->cli_sock == -1) {
190: LOGERR;
191: AIT_FREE_VAL(&cli->cli_buf);
192: free(cli->cli_parent);
193: free(cli);
194: return NULL;
195: }
196: if (connect(cli->cli_sock, &cli->cli_sa.sa, cli->cli_sa.sa.sa_len) == -1) {
197: LOGERR;
198: AIT_FREE_VAL(&cli->cli_buf);
199: close(cli->cli_sock);
200: free(cli->cli_parent);
201: free(cli);
202: return NULL;
203: } else
204: fcntl(cli->cli_sock, F_SETFL, fcntl(cli->cli_sock, F_GETFL) | O_NONBLOCK);
205:
206: return cli;
207: }
208:
209: /*
210: * rpc_cli_closeClient() - Close connection to RPC server and free resources
211: *
212: * @cli = RPC Client session
213: * return: none
214: */
215: void
216: rpc_cli_closeClient(rpc_cli_t ** __restrict cli)
217: {
218: if (!cli || !*cli)
219: return;
220:
221: shutdown((*cli)->cli_sock, SHUT_RDWR);
222: close((*cli)->cli_sock);
223:
224: AIT_FREE_VAL(&(*cli)->cli_buf);
225:
226: if ((*cli)->cli_parent)
227: free((*cli)->cli_parent);
228:
229: free(*cli);
230: *cli = NULL;
231: }
232:
233:
234: /*
235: * rpc_cli_execCall() - Execute RPC call
236: *
237: * @cli = RPC Client session
238: * @noreply = We not want RPC reply
239: * @tag = Function tag for execution
240: * @in_vars = IN RPC call array of rpc values, may be NULL
241: * @out_vars = OUT returned array of rpc values, if !=NULL must be free after use with io_freeVars()
242: * return: -1 error or != -1 ok result
243: */
244: int
245: rpc_cli_execCall(rpc_cli_t *cli, int noreply, u_short tag,
246: array_t * __restrict in_vars, array_t ** __restrict out_vars)
247: {
248: struct tagRPCCall *rpc;
249: int ret = 0, wlen = sizeof(struct tagRPCCall);
250: uint16_t crc;
251: u_char *buf;
252: struct pollfd pfd;
253:
254: if (!cli) {
255: rpc_SetErr(EINVAL, "Can`t execute call because parameter is null or invalid!");
256: return -1;
257: } else
258: buf = AIT_GET_BUF(&cli->cli_buf);
259: if (out_vars)
260: *out_vars = NULL;
261:
262: /* prepare RPC call */
263: rpc = (struct tagRPCCall*) buf;
264: rpc_addPktSession(&rpc->call_session, cli->cli_parent);
265: rpc->call_argc = htons(io_arraySize(in_vars));
266: rpc->call_tag = htons(tag);
267: rpc->call_seq = htons(random() % USHRT_MAX);
268:
269: /* set reply */
270: rpc->call_req.flags = noreply ? RPC_NOREPLY : RPC_REPLY;
271:
272: if (io_arraySize(in_vars)) {
273: /* marshaling variables */
274: ret = io_vars2buffer(buf + wlen, AIT_LEN(&cli->cli_buf) - wlen, in_vars);
275: if (ret == -1) {
276: rpc_SetErr(EBADRPC, "Failed to prepare RPC packet values");
277: return -1;
278: } else
279: wlen += ret;
280: }
281:
282: /* total packet length */
283: rpc->call_len = htons(wlen);
284:
285: /* calculate CRC */
286: rpc->call_crc ^= rpc->call_crc;
287: rpc->call_crc = htons(crcFletcher16((u_short*) buf, wlen / 2));
288:
289: if ((ret = send(cli->cli_sock, buf, wlen, MSG_NOSIGNAL)) == -1) {
290: LOGERR;
291: return -1;
292: } else if (ret != wlen) {
293: rpc_SetErr(EPROCUNAVAIL, "RPC request, should be send %d bytes, "
294: "really sended %d bytes", wlen, ret);
295: return -1;
296: }
297:
298: if (noreply) /* we not want reply */
299: return 0;
300:
301: /* reply from RPC server */
302: pfd.fd = cli->cli_sock;
303: pfd.events = POLLIN | POLLPRI;
304: if ((ret = poll(&pfd, 1, DEF_RPC_TIMEOUT * 1000)) == -1 ||
305: pfd.revents & (POLLERR | POLLHUP | POLLNVAL)) {
306: if (ret)
307: LOGERR;
308: else
309: rpc_SetErr(ETIMEDOUT, "Timeout, no answer from RPC server");
310:
311: return -1;
312: }
313: memset(buf, 0, AIT_LEN(&cli->cli_buf));
314: if ((ret = recv(cli->cli_sock, buf, AIT_LEN(&cli->cli_buf), 0)) < 1) {
315: if (ret)
316: LOGERR;
317: return -1;
318: }
319: if (ret < sizeof(struct tagRPCCall)) {
320: rpc_SetErr(ERPCMISMATCH, "Short RPC packet");
321: return -1;
322: }
323:
324: /* calculate CRC */
325: crc = ntohs(rpc->call_crc);
326: rpc->call_crc ^= rpc->call_crc;
327: if (crc != crcFletcher16((u_short*) buf, ret / 2)) {
328: rpc_SetErr(ERPCMISMATCH, "Bad CRC RPC packet");
329: return -1;
330: }
331:
332: /* check RPC packet session info */
333: if (rpc_chkPktSession(&rpc->call_session, cli->cli_parent)) {
334: rpc_SetErr(ERPCMISMATCH, "Get invalid RPC session");
335: return -1;
336: } else
337: wlen = sizeof(struct tagRPCCall);
338: if (ntohs(rpc->call_tag) != tag) {
339: rpc_SetErr(ERPCMISMATCH, "Get wrong RPC reply");
340: return -1;
341: }
342: if (ntohl(rpc->call_rep.eno) && ntohl(rpc->call_rep.ret) == -1) {
343: rpc_SetErr(ntohl(rpc->call_rep.eno), "Server side: retcode=%d #%d %s",
344: ntohl(rpc->call_rep.ret), ntohl(rpc->call_rep.eno),
345: strerror(ntohl(rpc->call_rep.eno)));
346: return -1;
347: }
348: if (ntohs(rpc->call_argc) * sizeof(ait_val_t) > AIT_LEN(&cli->cli_buf) - wlen) {
349: rpc_SetErr(EMSGSIZE, "Reply RPC packet is too long ...");
350: return -1;
351: }
352:
353: /* RPC is OK! Go de-marshaling variables ... */
354: if (out_vars && ntohs(rpc->call_argc)) {
355: *out_vars = io_buffer2vars(buf + wlen, AIT_LEN(&cli->cli_buf) - wlen,
356: ntohs(rpc->call_argc), 0);
357: if (!*out_vars) {
358: rpc_SetErr(io_GetErrno(), "%s", io_GetError());
359: return -1;
360: }
361: }
362:
363: ret = ntohl(rpc->call_rep.ret);
364: return ret;
365: }
366:
367: /*
368: * rpc_cli_ping() - Ping RPC server
369: *
370: * @cli = connected client
371: * return: -1 error or !=-1 ping seq id
372: */
373: inline int
374: rpc_cli_ping(rpc_cli_t *cli)
375: {
376: array_t *arr;
377: int ret = 0;
378:
379: if (!cli)
380: return -1;
381:
382: if (rpc_cli_execCall(cli, RPC_REPLY, CALL_SRVPING, NULL, &arr))
383: return -1;
384: else
385: ret = AIT_GET_U16(io_getVars(arr, 0));
386: io_freeVars(&arr);
387:
388: return ret;
389: }
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