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 1.7 2012/03/15 01:55:33 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: io_sockaddr_t sa;
61: int n;
62:
63: if (!rpccli ||
64: (rpccli->cli_sa.sa.sa_family != AF_INET && rpccli->cli_sa.sa.sa_family != AF_INET6 &&
65: rpccli->cli_sa.sa.sa_family != AF_LOCAL)) {
66: rpc_SetErr(EINVAL, "Invalid parameters can`t connect to BLOB server");
67: return NULL;
68: }
69:
70: cli = malloc(sizeof(rpc_cli_t));
71: if (!cli) {
72: LOGERR;
73: return NULL;
74: } else
75: memcpy(cli, rpccli, sizeof(rpc_cli_t));
76:
77: memcpy(&sa, &rpccli->cli_sa, sizeof sa);
78: switch (sa.sa.sa_family) {
79: case AF_INET:
80: sa.sin.sin_port = htons(Port ? Port : ntohs(sa.sin.sin_port) + 1);
81: break;
82: case AF_INET6:
83: sa.sin6.sin6_port = htons(Port ? Port : ntohs(sa.sin6.sin6_port) + 1);
84: break;
85: case AF_LOCAL:
86: strlcat(sa.sun.sun_path, ".blob", sizeof sa.sun.sun_path);
87: break;
88: }
89: memcpy(&cli->cli_sa, &sa, sizeof sa);
90:
91: /* connect to BLOB server */
92: cli->cli_sock = socket(cli->cli_sa.sa.sa_family, SOCK_STREAM, 0);
93: if (cli->cli_sock == -1) {
94: LOGERR;
95: free(cli);
96: return NULL;
97: }
98: n = cli->cli_netbuf;
99: if (setsockopt(cli->cli_sock, SOL_SOCKET, SO_SNDBUF, &n, sizeof n) == -1) {
100: LOGERR;
101: close(cli->cli_sock);
102: free(cli);
103: return NULL;
104: }
105: if (setsockopt(cli->cli_sock, SOL_SOCKET, SO_RCVBUF, &n, sizeof n) == -1) {
106: LOGERR;
107: close(cli->cli_sock);
108: free(cli);
109: return NULL;
110: }
111: if (connect(cli->cli_sock, &cli->cli_sa.sa, cli->cli_sa.sa.sa_len) == -1) {
112: LOGERR;
113: close(cli->cli_sock);
114: free(cli);
115: return NULL;
116: }
117:
118: return cli;
119: }
120:
121: /*
122: * rpc_cli_closeBLOBClient() - Close connection to BLOB server and free resources
123: *
124: * @cli = BLOB Client session
125: * return: none
126: */
127: void
128: rpc_cli_closeBLOBClient(rpc_cli_t * __restrict cli)
129: {
130: if (!cli) {
131: rpc_SetErr(EINVAL, "Can`t close connection because parameter is null!");
132: return;
133: }
134:
135: shutdown(cli->cli_sock, SHUT_RDWR);
136: close(cli->cli_sock);
137:
138: free(cli);
139: cli = NULL;
140: }
141:
142: // --------------------------------------------------------------
143:
144: /*
145: * rpc_cli_openClient() - Connect to RPC Server
146: *
147: * @ProgID = ProgramID for RPC session request
148: * @ProcID = ProcessID for RPC session request
149: * @netBuf = Network buffer length, if =0 == BUFSIZ (also meaning max RPC packet)
150: * @Timeout = RPC timeout in seconds, if =0 set default RPC timeout
151: * @family = Family socket type, AF_INET or AF_INET6
152: * @csHost = Host name or IP address for bind server
153: * @Port = Port for bind server, if Port == 0 default port is selected
154: * return: NULL == error or !=NULL connection to RPC server established
155: */
156: rpc_cli_t *
157: rpc_cli_openClient(u_int ProgID, u_int ProcID, int netBuf, u_char Timeout,
158: u_short family, const char *csHost, u_short Port)
159: {
160: rpc_cli_t *cli = NULL;
161: struct hostent *host = NULL;
162: io_sockaddr_t sa;
163: int n;
164:
165: if (!csHost || (family != AF_INET && family != AF_INET6 && family != AF_LOCAL)) {
166: rpc_SetErr(EINVAL, "Error:: Invalid parameters can`t connect to RPC server ...\n");
167: return NULL;
168: }
169: if (!Port)
170: Port = RPC_DEFPORT;
171: if (!netBuf)
172: netBuf = BUFSIZ;
173: if (!Timeout)
174: Timeout = DEF_RPC_TIMEOUT;
175: if (csHost && family != AF_LOCAL) {
176: host = gethostbyname2(csHost, family);
177: if (!host) {
178: rpc_SetErr(h_errno, "Error:: %s\n", hstrerror(h_errno));
179: return NULL;
180: }
181: }
182: memset(&sa, 0, sizeof sa);
183: sa.sa.sa_family = family;
184: switch (family) {
185: case AF_INET:
186: sa.sin.sin_len = sizeof(struct sockaddr_in);
187: sa.sin.sin_port = htons(Port);
188: if (csHost)
189: memcpy(&sa.sin.sin_addr, host->h_addr, host->h_length);
190: break;
191: case AF_INET6:
192: sa.sin6.sin6_len = sizeof(struct sockaddr_in6);
193: sa.sin6.sin6_port = htons(Port);
194: if (csHost)
195: memcpy(&sa.sin6.sin6_addr, host->h_addr, host->h_length);
196: break;
197: case AF_LOCAL:
198: sa.sun.sun_len = sizeof(struct sockaddr_un);
199: if (csHost)
200: strlcpy(sa.sun.sun_path, csHost, sizeof sa.sun.sun_path);
201: break;
202: default:
203: rpc_SetErr(EINVAL, "Error:: Invalid parameters can`t connect to RPC server ...\n");
204: return NULL;
205: }
206:
207: cli = malloc(sizeof(rpc_cli_t));
208: if (!cli) {
209: LOGERR;
210: return NULL;
211: } else
212: memset(cli, 0, sizeof(rpc_cli_t));
213:
214: cli->cli_netbuf = netBuf;
215: cli->cli_parent = malloc(sizeof(rpc_sess_t));
216: if (!cli->cli_parent) {
217: LOGERR;
218: free(cli);
219: return NULL;
220: } else {
221: ((rpc_sess_t*) cli->cli_parent)->sess_version = RPC_VERSION;
222: ((rpc_sess_t*) cli->cli_parent)->sess_timeout = Timeout;
223: ((rpc_sess_t*) cli->cli_parent)->sess_program = ProgID;
224: ((rpc_sess_t*) cli->cli_parent)->sess_process = ProcID;
225: }
226:
227: memcpy(&cli->cli_sa, &sa, sizeof cli->cli_sa);
228:
229: /* connect to RPC server */
230: cli->cli_sock = socket(family, SOCK_STREAM, 0);
231: if (cli->cli_sock == -1) {
232: LOGERR;
233: free(cli->cli_parent);
234: free(cli);
235: return NULL;
236: }
237: n = cli->cli_netbuf;
238: if (setsockopt(cli->cli_sock, SOL_SOCKET, SO_SNDBUF, &n, sizeof n) == -1) {
239: LOGERR;
240: close(cli->cli_sock);
241: free(cli->cli_parent);
242: free(cli);
243: return NULL;
244: }
245: if (setsockopt(cli->cli_sock, SOL_SOCKET, SO_RCVBUF, &n, sizeof n) == -1) {
246: LOGERR;
247: close(cli->cli_sock);
248: free(cli->cli_parent);
249: free(cli);
250: return NULL;
251: }
252: if (connect(cli->cli_sock, &cli->cli_sa.sa, cli->cli_sa.sa.sa_len) == -1) {
253: LOGERR;
254: close(cli->cli_sock);
255: free(cli->cli_parent);
256: free(cli);
257: return NULL;
258: }
259:
260: return cli;
261: }
262:
263: /*
264: * rpc_cli_closeClient() - Close connection to RPC server and free resources
265: *
266: * @cli = RPC Client session
267: * return: none
268: */
269: void
270: rpc_cli_closeClient(rpc_cli_t * __restrict cli)
271: {
272: if (!cli) {
273: rpc_SetErr(EINVAL, "Can`t close connection because parameter is null!");
274: return;
275: }
276:
277: shutdown(cli->cli_sock, SHUT_RDWR);
278: close(cli->cli_sock);
279:
280: if (cli->cli_parent)
281: free(cli->cli_parent);
282: free(cli);
283: cli = NULL;
284: }
285:
286:
287: /*
288: * rpc_cli_execCall() - Execute RPC call
289: *
290: * @cli = RPC Client session
291: * @csModule = Module name, if NULL self binary
292: * @csFunc = Function name for execute
293: * @in_vars = IN RPC call array of rpc values
294: * @out_vars = OUT returned array of rpc values, must be free after use with rpc_cli_freeVals()
295: * return: -1 error or != -1 ok result
296: */
297: int
298: rpc_cli_execCall(rpc_cli_t *cli, const char *csModule, const char *csFunc,
299: array_t * __restrict in_vars, array_t ** __restrict out_vars)
300: {
301: fd_set fds;
302: u_char *buf;
303: rpc_func_t func;
304: struct tagRPCCall *rpc;
305: int ret = 0, wlen = sizeof(struct tagRPCCall);
306: struct timeval tv = { DEF_RPC_TIMEOUT, 0 };
307: uint16_t tag;
308: uint32_t hash;
309:
310: if (!cli || !csFunc) {
311: rpc_SetErr(EINVAL, "Can`t execute call because parameter is null or invalid!");
312: return -1;
313: }
314: if (out_vars)
315: *out_vars = NULL;
316:
317: buf = malloc(cli->cli_netbuf);
318: if (!buf) {
319: LOGERR;
320: return -1;
321: } else
322: memset(buf, 0, cli->cli_netbuf);
323:
324: /* calculate hashes */
325: if (rpc_calcHashes(&func, csModule, csFunc) == -1)
326: return -1;
327: else {
328: tag = htons(func.func_tag);
329: hash = htonl(func.func_hash);
330: AIT_FREE_VAL(&func.func_name);
331: AIT_FREE_VAL(&func.func_file);
332: }
333:
334: /* prepare RPC call */
335: rpc = (struct tagRPCCall*) buf;
336: rpc_addPktSession(&rpc->call_session, cli->cli_parent);
337: rpc->call_argc = htons(io_arraySize(in_vars));
338: rpc->call_tag = tag;
339: rpc->call_hash = hash;
340:
341: if (io_arraySize(in_vars)) {
342: /* marshaling variables */
343: ret = io_vars2buffer(buf + wlen, cli->cli_netbuf - wlen, in_vars);
344: if (ret == -1) {
345: rpc_SetErr(EBADRPC, "Failed to prepare RPC packet values");
346: free(buf);
347: return -1;
348: } else
349: wlen += ret;
350: }
351:
352: /* calculate CRC */
353: rpc->call_crc ^= rpc->call_crc;
354: rpc->call_crc = htons(crcFletcher16((u_short*) buf, io_align(wlen, 1) / 2));
355:
356: if ((ret = send(cli->cli_sock, buf, wlen, 0)) == -1) {
357: LOGERR;
358: free(buf);
359: return -1;
360: } else if (ret != wlen) {
361: rpc_SetErr(EPROCUNAVAIL, "RPC request, should be send %d bytes, "
362: "really sended %d bytes", wlen, ret);
363: free(buf);
364: return -1;
365: }
366:
367: /* reply from RPC server */
368: FD_ZERO(&fds);
369: FD_SET(cli->cli_sock, &fds);
370: if ((ret = select(cli->cli_sock + 1, &fds, NULL, NULL, &tv)) < 1) {
371: if (ret)
372: LOGERR;
373: else
374: rpc_SetErr(ETIMEDOUT, "Error:: timeout, no return from RPC server?\n");
375:
376: free(buf);
377: return -1;
378: }
379: memset(buf, 0, cli->cli_netbuf);
380: if ((ret = recv(cli->cli_sock, buf, cli->cli_netbuf, 0)) == -1) {
381: LOGERR;
382: free(buf);
383: return -3;
384: }
385: if (!ret) { /* receive EOF! */
386: free(buf);
387: return 0;
388: }
389: if (ret < sizeof(struct tagRPCCall)) {
390: rpc_SetErr(ERPCMISMATCH, "Error:: too short RPC packet ...\n");
391: free(buf);
392: return -4;
393: }
394: /* check RPC packet session info */
395: if (rpc_chkPktSession(&rpc->call_session, cli->cli_parent)) {
396: rpc_SetErr(ERPCMISMATCH, "Error:: get invalid RPC session ...\n");
397: free(buf);
398: return -5;
399: } else
400: wlen = sizeof(struct tagRPCCall);
401: if (rpc->call_tag != tag || rpc->call_hash != hash) {
402: rpc_SetErr(ERPCMISMATCH, "Error:: get wrong RPC reply ...\n");
403: free(buf);
404: return -5;
405: }
406: if (ntohl(rpc->call_rep.ret) < 0 && ntohl(rpc->call_rep.eno)) {
407: rpc_SetErr(ntohl(rpc->call_rep.eno), "Error::Server side: retcode=%d #%d %s\n",
408: ntohl(rpc->call_rep.ret), ntohl(rpc->call_rep.eno),
409: strerror(ntohl(rpc->call_rep.eno)));
410: free(buf);
411: return -6;
412: }
413: if (ntohs(rpc->call_argc) * sizeof(ait_val_t) > cli->cli_netbuf - wlen) {
414: rpc_SetErr(EMSGSIZE, "Error:: reply RPC packet is too long ...\n");
415: free(buf);
416: return -7;
417: }
418:
419: /* RPC is OK! Go de-marshaling variables ... */
420: if (ntohs(rpc->call_argc)) {
421: *out_vars = io_buffer2vars(buf + wlen, cli->cli_netbuf - wlen,
422: ntohs(rpc->call_argc), 0);
423: if (!*out_vars) {
424: free(buf);
425: return -1;
426: }
427: }
428:
429: ret = ntohl(rpc->call_rep.ret);
430: free(buf);
431: return ret;
432: }
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