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 1.9.2.15 2012/05/17 22:57:42 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 (min:512 bytes), 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 < RPC_MIN_BUFSIZ)
155: netBuf = BUFSIZ;
156: else
157: netBuf = io_align(netBuf, 1); /* align netBuf length */
158:
159: #ifdef HAVE_SRANDOMDEV
160: srandomdev();
161: #else
162: time_t tim;
163:
164: srandom((time(&tim) ^ getpid()));
165: #endif
166:
167: cli = malloc(sizeof(rpc_cli_t));
168: if (!cli) {
169: LOGERR;
170: return NULL;
171: } else
172: memset(cli, 0, sizeof(rpc_cli_t));
173:
174: /* build session */
175: cli->cli_parent = malloc(sizeof(rpc_sess_t));
176: if (!cli->cli_parent) {
177: LOGERR;
178: free(cli);
179: return NULL;
180: } else {
181: ((rpc_sess_t*) cli->cli_parent)->sess_version = RPC_VERSION;
182: ((rpc_sess_t*) cli->cli_parent)->sess_program = ProgID;
183: ((rpc_sess_t*) cli->cli_parent)->sess_process = ProcID;
184: }
185:
186: memcpy(&cli->cli_sa, &sa, sizeof cli->cli_sa);
187: AIT_SET_BUF2(&cli->cli_buf, 0, netBuf);
188:
189: /* connect to RPC server */
190: cli->cli_sock = socket(cli->cli_sa.sa.sa_family, SOCK_STREAM, 0);
191: if (cli->cli_sock == -1) {
192: LOGERR;
193: AIT_FREE_VAL(&cli->cli_buf);
194: free(cli->cli_parent);
195: free(cli);
196: return NULL;
197: }
198: if (connect(cli->cli_sock, &cli->cli_sa.sa, cli->cli_sa.sa.sa_len) == -1) {
199: LOGERR;
200: AIT_FREE_VAL(&cli->cli_buf);
201: close(cli->cli_sock);
202: free(cli->cli_parent);
203: free(cli);
204: return NULL;
205: } else
206: fcntl(cli->cli_sock, F_SETFL, fcntl(cli->cli_sock, F_GETFL) | O_NONBLOCK);
207:
208: return cli;
209: }
210:
211: /*
212: * rpc_cli_closeClient() - Close connection to RPC server and free resources
213: *
214: * @cli = RPC Client session
215: * return: none
216: */
217: void
218: rpc_cli_closeClient(rpc_cli_t ** __restrict cli)
219: {
220: if (!cli || !*cli)
221: return;
222:
223: shutdown((*cli)->cli_sock, SHUT_RDWR);
224: close((*cli)->cli_sock);
225:
226: AIT_FREE_VAL(&(*cli)->cli_buf);
227:
228: if ((*cli)->cli_parent)
229: free((*cli)->cli_parent);
230:
231: free(*cli);
232: *cli = NULL;
233: }
234:
235:
236: /*
237: * rpc_cli_execCall() - Execute RPC call
238: *
239: * @cli = RPC Client session
240: * @noreply = We not want RPC reply
241: * @tag = Function tag for execution
242: * @in_vars = IN RPC call array of rpc values, may be NULL
243: * @out_vars = OUT returned array of rpc values, if !=NULL must be free after use with io_freeVars()
244: * return: -1 error or != -1 ok result
245: */
246: int
247: rpc_cli_execCall(rpc_cli_t *cli, int noreply, u_short tag,
248: array_t * __restrict in_vars, array_t ** __restrict out_vars)
249: {
250: struct tagRPCCall *rpc;
251: int ret = 0, wlen = sizeof(struct tagRPCCall);
252: uint16_t crc;
253: u_char *buf;
254: struct pollfd pfd;
255:
256: if (!cli) {
257: rpc_SetErr(EINVAL, "Can`t execute call because parameter is null or invalid!");
258: return -1;
259: } else
260: buf = AIT_GET_BUF(&cli->cli_buf);
261: if (out_vars)
262: *out_vars = NULL;
263:
264: /* prepare RPC call */
265: rpc = (struct tagRPCCall*) buf;
266: rpc_addPktSession(&rpc->call_session, cli->cli_parent);
267: rpc->call_argc = htons(io_arraySize(in_vars));
268: rpc->call_tag = htons(tag);
269: rpc->call_seq = htons(random() % USHRT_MAX);
270:
271: /* set reply */
272: rpc->call_req.flags = noreply ? RPC_NOREPLY : RPC_REPLY;
273:
274: if (io_arraySize(in_vars)) {
275: /* marshaling variables */
276: ret = io_vars2buffer(buf + wlen, AIT_LEN(&cli->cli_buf) - wlen, in_vars);
277: if (ret == -1) {
278: rpc_SetErr(EBADRPC, "Failed to prepare RPC packet values");
279: return -1;
280: } else
281: wlen += ret;
282: }
283:
284: /* total packet length */
285: rpc->call_len = htons(wlen);
286:
287: /* calculate CRC */
288: rpc->call_crc ^= rpc->call_crc;
289: rpc->call_crc = htons(crcFletcher16((u_short*) buf, wlen / 2));
290:
291: pfd.fd = cli->cli_sock;
292: pfd.events = POLLOUT;
293: do {
294: if ((ret = poll(&pfd, 1, DEF_RPC_TIMEOUT * 1000)) < 1 ||
295: pfd.revents & (POLLERR | POLLHUP | POLLNVAL)) {
296: if (ret) {
297: if (errno == EAGAIN)
298: continue;
299: else
300: LOGERR;
301: } else
302: rpc_SetErr(ETIMEDOUT, "Timeout, can't send to RPC server");
303: return -1;
304: }
305: } while (0);
306: if ((ret = send(cli->cli_sock, buf, wlen, MSG_NOSIGNAL)) == -1) {
307: LOGERR;
308: return -1;
309: } else if (ret != wlen) {
310: rpc_SetErr(EPROCUNAVAIL, "RPC request, should be send %d bytes, "
311: "really sended %d bytes", wlen, ret);
312: return -1;
313: }
314:
315: if (noreply) /* we not want reply */
316: return 0;
317:
318: /* reply from RPC server */
319: pfd.events = POLLIN | POLLPRI;
320: do {
321: if ((ret = poll(&pfd, 1, DEF_RPC_TIMEOUT * 1000)) < 1 ||
322: pfd.revents & (POLLERR | POLLHUP | POLLNVAL)) {
323: if (ret) {
324: if (errno == EAGAIN)
325: continue;
326: else
327: LOGERR;
328: } else
329: rpc_SetErr(ETIMEDOUT, "Timeout, no answer from RPC server");
330: return -1;
331: }
332: } while (0);
333: memset(buf, 0, AIT_LEN(&cli->cli_buf));
334: if ((ret = recv(cli->cli_sock, buf, AIT_LEN(&cli->cli_buf), 0)) < 1) {
335: if (ret)
336: LOGERR;
337: return -1;
338: }
339: if (ret < sizeof(struct tagRPCCall)) {
340: rpc_SetErr(ERPCMISMATCH, "Short RPC packet");
341: return -1;
342: }
343:
344: /* calculate CRC */
345: crc = ntohs(rpc->call_crc);
346: rpc->call_crc ^= rpc->call_crc;
347: if (crc != crcFletcher16((u_short*) buf, ret / 2)) {
348: rpc_SetErr(ERPCMISMATCH, "Bad CRC RPC packet");
349: return -1;
350: }
351:
352: /* check RPC packet session info */
353: if (rpc_chkPktSession(&rpc->call_session, cli->cli_parent)) {
354: rpc_SetErr(ERPCMISMATCH, "Get invalid RPC session");
355: return -1;
356: } else
357: wlen = sizeof(struct tagRPCCall);
358: if (ntohs(rpc->call_tag) != tag) {
359: rpc_SetErr(ERPCMISMATCH, "Get wrong RPC reply");
360: return -1;
361: }
362: if (ntohl(rpc->call_rep.eno) && ntohl(rpc->call_rep.ret) == -1) {
363: rpc_SetErr(ntohl(rpc->call_rep.eno), "Server side: retcode=%d #%d %s",
364: ntohl(rpc->call_rep.ret), ntohl(rpc->call_rep.eno),
365: strerror(ntohl(rpc->call_rep.eno)));
366: return -1;
367: }
368: if (ntohs(rpc->call_argc) * sizeof(ait_val_t) > AIT_LEN(&cli->cli_buf) - wlen) {
369: rpc_SetErr(EMSGSIZE, "Reply RPC packet is too long ...");
370: return -1;
371: }
372:
373: /* RPC is OK! Go de-marshaling variables ... */
374: if (out_vars && ntohs(rpc->call_argc)) {
375: *out_vars = io_buffer2vars(buf + wlen, AIT_LEN(&cli->cli_buf) - wlen,
376: ntohs(rpc->call_argc), 0);
377: if (!*out_vars) {
378: rpc_SetErr(io_GetErrno(), "%s", io_GetError());
379: return -1;
380: }
381: }
382:
383: ret = ntohl(rpc->call_rep.ret);
384: return ret;
385: }
386:
387: /*
388: * rpc_cli_ping() - Ping RPC server
389: *
390: * @cli = connected client
391: * return: -1 error or !=-1 ping seq id
392: */
393: inline int
394: rpc_cli_ping(rpc_cli_t *cli)
395: {
396: int ret = 0;
397: array_t *arr = NULL;
398:
399: if (!cli)
400: return -1;
401:
402: if (rpc_cli_execCall(cli, RPC_REPLY, CALL_SRVPING, NULL, &arr))
403: return -1;
404: else
405: ret = AIT_GET_U16(io_getVars(arr, 0));
406: io_freeVars(&arr);
407:
408: return ret;
409: }
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