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 1.14 2013/12/15 23:01:02 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, 0 EOF or or >0 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: for (len = blen; len > 0; len -= ret, buf += ret) {
170: if ((ret = poll(&pfd, 1, DEF_RPC_TIMEOUT * 1000)) < 1 ||
171: pfd.revents & (POLLERR | POLLHUP | POLLNVAL)) {
172: if (ret)
173: LOGERR;
174: else
175: rpc_SetErr(ETIMEDOUT, "Timeout reached! Server not respond");
176: return -1;
177: }
178: if (type == SOCK_STREAM)
179: ret = recv(sock, buf, len, flags);
180: else {
181: ret = recvfrom(sock, buf, len, flags, &sa2.sa, &salen);
182: if (ret > -1 && sa && e_addrcmp(sa, &sa2, 42)) {
183: rpc_SetErr(ERPCMISMATCH,
184: "Received RPC response from unknown address");
185: return -1;
186: }
187: }
188: if (ret == -1) {
189: LOGERR;
190: return -1;
191: }
192: if (!ret) /* EOF */
193: return 0;
194: }
195: ret = blen - len;
196:
197: return ret;
198: }
199:
200: /*
201: * rpc_Write() - RPC write operation
202: *
203: * @sock = socket
204: * @type = type of socket
205: * @flags = send flags
206: * @sa = send to client address, if you use udp protocol
207: * @buf = buffer
208: * @blen = buffer length
209: * return: -1 error, 0 EOF or >0 written bytes into buffer
210: */
211: ssize_t
212: rpc_Write(int sock, int type, int flags, sockaddr_t * __restrict sa,
213: u_char * __restrict buf, size_t blen)
214: {
215: struct pollfd pfd;
216: int ret = 0, len = 0;
217:
218: pfd.fd = sock;
219: pfd.events = POLLOUT;
220: for (len = blen; len > 0; len -= ret, buf += ret) {
221: if ((ret = poll(&pfd, 1, DEF_RPC_TIMEOUT * 1000)) < 1 ||
222: pfd.revents & (POLLERR | POLLHUP | POLLNVAL)) {
223: #if 0
224: if (!ret)
225: continue;
226: #endif
227: if (ret > 0)
228: rpc_SetErr(EPIPE, "Disconnected RPC session\n");
229: else
230: LOGERR;
231: return -1;
232: }
233: if (type == SOCK_STREAM)
234: ret = send(sock, buf, len, flags);
235: else if (sa)
236: ret = sendto(sock, buf, len, flags, &sa->sa, sa->sa.sa_len);
237: else {
238: rpc_SetErr(EINVAL, "Invalid argument(s)!");
239: return -1;
240: }
241: if (ret == -1) {
242: LOGERR;
243: return -1;
244: }
245: if (!ret) /* EOF */
246: return 0;
247: }
248: ret = blen - len;
249: if (ret != blen) {
250: rpc_SetErr(EPROCUNAVAIL, "RPC request, should be send %d bytes, "
251: "really sended %d bytes", len, ret);
252: return -1;
253: }
254:
255: return ret;
256: }
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