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: aitrpc.c,v 1.12 2013/11/11 22:48:53 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, 2013
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: #pragma GCC visibility push(hidden)
50:
51: int rpc_Errno;
52: char rpc_Error[STRSIZ];
53:
54: inline int
55: rpc_funcs_cmp(struct tagRPCFunc *a, struct tagRPCFunc *b)
56: {
57: int ret;
58:
59: assert(a && b);
60:
61: ret = AIT_KEY(&a->func_name) - AIT_KEY(&b->func_name);
62:
63: if (ret < 0)
64: return -1;
65: else if (ret > 0)
66: return 1;
67:
68: return ret;
69: }
70:
71: AVL_GENERATE(tagRPCFuncs, tagRPCFunc, func_node, rpc_funcs_cmp);
72:
73: #pragma GCC visibility pop
74:
75: // rpc_GetErrno() Get error code of last operation
76: int
77: rpc_GetErrno()
78: {
79: return rpc_Errno;
80: }
81:
82: // rpc_GetError() Get error text of last operation
83: const char *
84: rpc_GetError()
85: {
86: return rpc_Error;
87: }
88:
89: // rpc_SetErr() Set error to variables for internal use!!!
90: void
91: rpc_SetErr(int eno, char *estr, ...)
92: {
93: va_list lst;
94:
95: rpc_Errno = eno;
96: memset(rpc_Error, 0, sizeof rpc_Error);
97: va_start(lst, estr);
98: vsnprintf(rpc_Error, sizeof rpc_Error, estr, lst);
99: va_end(lst);
100: }
101:
102:
103: /*
104: * rpc_chkPktSession() - Check RPC session
105: *
106: * @p = packet session
107: * @s = active session
108: * return: -1, 1, 2, 3 are errors or 0 ok
109: */
110: int
111: rpc_chkPktSession(rpc_sess_t *p, rpc_sess_t *s)
112: {
113: if (!p || !s)
114: return -1;
115:
116: if (p->sess_version != s->sess_version)
117: return 1;
118: if (p->sess_instance != s->sess_instance)
119: return 2;
120:
121: return 0;
122: }
123:
124: /*
125: * rpc_addPktSession() - Prepare session into network format
126: *
127: * @p = packet session
128: * @s = host session
129: * return: -1 error or 0 ok
130: */
131: int
132: rpc_addPktSession(rpc_sess_t *p, rpc_sess_t *s)
133: {
134: if (!p || !s)
135: return -1;
136:
137: p->sess_version = s->sess_version;
138: p->sess_instance = s->sess_instance;
139:
140: return 0;
141: }
142:
143: /*
144: * rpc_Read() - RPC read operation
145: *
146: * @sock = socket
147: * @type = type of socket
148: * @flags = receive flags
149: * @sa = check client address, if you use udp protocol
150: * @buf = buffer
151: * @blen = buffer length
152: * return: -1 error or >-1 readed bytes into buffer
153: */
154: ssize_t
155: rpc_Read(int sock, int type, int flags, sockaddr_t * __restrict sa,
156: u_char * __restrict buf, size_t blen)
157: {
158: struct pollfd pfd;
159: sockaddr_t sa2;
160: socklen_t salen;
161: int ret = 0, len;
162:
163: pfd.fd = sock;
164: pfd.events = POLLIN | POLLPRI;
165: memset(buf, 0, blen);
166: memset(&sa2, 0, sizeof sa2);
167: salen = sa2.ss.ss_len = sizeof(sockaddr_t);
168:
169: if (type == SOCK_STREAM) {
170: for (len = blen; len > 0; len -= ret, buf += ret) {
171: if ((ret = poll(&pfd, 1, DEF_RPC_TIMEOUT * 1000)) < 1 ||
172: pfd.revents & (POLLERR | POLLHUP | POLLNVAL)) {
173: LOGERR;
174: return -1;
175: } else
176: ret = recv(sock, buf, len, flags);
177: if (ret == -1) {
178: LOGERR;
179: return -1;
180: }
181: }
182: if (ret > -1)
183: ret = blen - len;
184: } else {
185: do {
186: if ((ret = poll(&pfd, 1, DEF_RPC_TIMEOUT * 1000)) < 1 ||
187: pfd.revents & (POLLERR | POLLHUP | POLLNVAL)) {
188: LOGERR;
189: return -1;
190: } else
191: ret = recvfrom(sock, buf, blen, flags, &sa2.sa, &salen);
192: if (ret < 0) {
193: LOGERR;
194: return -1;
195: }
196: if (e_addrcmp(sa, &sa2, 42))
197: rpc_SetErr(ERPCMISMATCH, "Received RPC response from unknown address");
198: else
199: break;
200: } while (42);
201: }
202:
203: return ret;
204: }
205:
206: /*
207: * rpc_Write() - RPC write operation
208: *
209: * @sock = socket
210: * @type = type of socket
211: * @flags = send flags
212: * @sa = send to client address, if you use udp protocol
213: * @buf = buffer
214: * @blen = buffer length
215: * return: -1 error or >-1 written bytes into buffer
216: */
217: ssize_t
218: rpc_Write(int sock, int type, int flags, sockaddr_t * __restrict sa,
219: u_char * __restrict buf, size_t blen)
220: {
221: struct pollfd pfd;
222: int ret = 0, len = 0;
223:
224: pfd.fd = sock;
225: pfd.events = POLLOUT;
226:
227: if (type == SOCK_STREAM) {
228: for (len = blen; len > 0; len -= ret, buf += ret) {
229: if ((ret = poll(&pfd, 1, DEF_RPC_TIMEOUT * 1000)) < 1 ||
230: pfd.revents & (POLLERR | POLLHUP | POLLNVAL)) {
231: if (!ret)
232: continue;
233: if (ret > 0)
234: rpc_SetErr(EPIPE, "Disconnected RPC session\n");
235: else
236: LOGERR;
237: return -1;
238: } else
239: ret = send(sock, buf, len, flags);
240: if (ret == -1) {
241: LOGERR;
242: return -1;
243: }
244: }
245: if (ret > -1)
246: ret = blen - len;
247: } else if (sa) {
248: do {
249: if ((ret = poll(&pfd, 1, DEF_RPC_TIMEOUT * 1000)) < 1 ||
250: pfd.revents & (POLLERR | POLLHUP | POLLNVAL)) {
251: if (!ret)
252: continue;
253: if (ret > 0)
254: rpc_SetErr(EPIPE, "Disconnected RPC session\n");
255: else
256: LOGERR;
257: return -1;
258: } else
259: ret = sendto(sock, buf, blen, flags, &sa->sa, sa->sa.sa_len);
260: } while (0);
261: } else {
262: rpc_SetErr(EINVAL, "Invalid argument(s)!");
263: return -1;
264: }
265: if (ret == -1) {
266: LOGERR;
267: return -1;
268: } else if (ret != blen) {
269: rpc_SetErr(EPROCUNAVAIL, "RPC request, should be send %d bytes, "
270: "really sended %d bytes", len, ret);
271: return -1;
272: }
273:
274: return ret;
275: }
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