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 1.20.2.1 2016/08/02 10:13:32 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 - 2016
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: #pragma GCC visibility pop
55:
56: // rpc_GetErrno() Get error code of last operation
57: int
58: rpc_GetErrno()
59: {
60: return rpc_Errno;
61: }
62:
63: // rpc_GetError() Get error text of last operation
64: const char *
65: rpc_GetError()
66: {
67: return rpc_Error;
68: }
69:
70: // rpc_SetErr() Set error to variables for internal use!!!
71: void
72: rpc_SetErr(int eno, char *estr, ...)
73: {
74: va_list lst;
75:
76: rpc_Errno = eno;
77: memset(rpc_Error, 0, sizeof rpc_Error);
78: va_start(lst, estr);
79: vsnprintf(rpc_Error, sizeof rpc_Error, estr, lst);
80: va_end(lst);
81: }
82:
83:
84: /*
85: * rpc_chkPktSession() - Check RPC session
86: *
87: * @p = packet session
88: * @s = active session
89: * return: -1, 1, 2, 3 are errors or 0 ok
90: */
91: int
92: rpc_chkPktSession(rpc_sess_t *p, rpc_sess_t *s)
93: {
94: if (!p || !s)
95: return -1;
96:
97: if (p->sess_version != s->sess_version)
98: return 1;
99: if (p->sess_instance != s->sess_instance)
100: return 2;
101:
102: return 0;
103: }
104:
105: /*
106: * rpc_addPktSession() - Prepare session into network format
107: *
108: * @p = packet session
109: * @s = host session
110: * return: -1 error or 0 ok
111: */
112: int
113: rpc_addPktSession(rpc_sess_t *p, rpc_sess_t *s)
114: {
115: if (!p || !s)
116: return -1;
117:
118: p->sess_version = s->sess_version;
119: p->sess_instance = s->sess_instance;
120:
121: return 0;
122: }
123:
124: /*
125: * rpc_Read() - RPC read operation
126: *
127: * @sock = socket
128: * @type = type of socket
129: * @flags = receive flags
130: * @sa = check client address, if you use udp protocol
131: * @pkt = RPC packet
132: * return: -1 error, 0 EOF or or >0 readed bytes into buffer
133: */
134: ssize_t
135: rpc_Read(int sock, int type, int flags, sockaddr_t * __restrict sa, ait_val_t * __restrict pkt)
136: {
137: struct pollfd pfd;
138: sockaddr_t sa2;
139: socklen_t salen;
140: int ret = 0, hlen, cx = 0;
141: ether_addr_t bcst = {{ [0 ... sizeof bcst - 1] = 0xff }};
142: u_char *buf = AIT_GET_BUF(pkt);
143: size_t blen = AIT_LEN(pkt);
144: struct tagRPCCall *rpc = (struct tagRPCCall *) buf;
145: #ifndef __linux__
146: struct ether_header *eh;
147: struct bpf_hdr *h;
148: ait_val_t v = AIT_VAL_INIT;
149: #endif
150:
151: try2read:
152: pfd.fd = sock;
153: pfd.events = POLLIN | POLLPRI;
154: memset(buf, 0, blen);
155: memset(&sa2, 0, sizeof sa2);
156: #ifndef __linux__
157: salen = sa2.ss.ss_len = (u_char) MIN(sizeof(sockaddr_t), 0xff);
158: #endif
159: if ((ret = poll(&pfd, 1, DEF_RPC_TIMEOUT * 1000)) < 1 ||
160: pfd.revents & (POLLERR | POLLHUP | POLLNVAL)) {
161: if (ret)
162: LOGERR;
163: else
164: rpc_SetErr(ETIMEDOUT, "Timeout reached! Server not respond");
165: return -1;
166: }
167:
168: switch (type) {
169: case SOCK_STREAM:
170: ret = recv(sock, buf, blen, flags);
171: break;
172: case SOCK_EXT:
173: ret = read(sock, buf, blen);
174: break;
175: #ifndef __linux__
176: case SOCK_BPF:
177: if (!sa) {
178: rpc_SetErr(EINVAL, "Invalid argument(s)!");
179: return -1;
180: }
181:
182: AIT_SET_BUF(&v, NULL, blen);
183: h = (struct bpf_hdr*) AIT_GET_BUF(&v);
184:
185: ret = read(sock, AIT_GET_BUF(&v), AIT_LEN(&v));
186: if (ret > 0) {
187: ret -= h->bh_hdrlen;
188: if (ret < h->bh_caplen || h->bh_caplen != h->bh_datalen ||
189: ret < ETHER_HDR_LEN + sizeof(struct tagRPCCall)) {
190: AIT_FREE_VAL(&v);
191: if (cx < 3) {
192: cx++;
193: ret ^= ret;
194: goto try2read; /* wait for known address */
195: } else
196: return -1;
197: }
198: ret = h->bh_caplen;
199: eh = (struct ether_header*) (AIT_GET_BUF(&v) + h->bh_hdrlen);
200: ret -= ETHER_HDR_LEN;
201: if (eh->ether_type != ntohs(RPC_DEFPORT)) {
202: AIT_FREE_VAL(&v);
203: if (cx < 3) {
204: cx++;
205: ret ^= ret;
206: goto try2read; /* wait for known address */
207: } else
208: return -1;
209: }
210:
211: if (!memcmp(bcst.octet, eh->ether_dhost, sizeof bcst) ||
212: !memcmp(bcst.octet, eh->ether_shost, sizeof bcst)) {
213: AIT_FREE_VAL(&v);
214: if (cx < 3) {
215: cx++;
216: ret ^= ret;
217: goto try2read; /* wait for known address */
218: } else
219: return -1;
220: }
221: memcpy(buf, (u_char*) (eh + 1), MIN(ret, blen));
222: AIT_FREE_VAL(&v);
223: }
224: break;
225: #endif
226: case SOCK_RAW:
227: case SOCK_DGRAM:
228: if (!sa) {
229: rpc_SetErr(EINVAL, "Invalid argument(s)!");
230: return -1;
231: }
232:
233: ret = recvfrom(sock, buf, blen, flags, &sa2.sa, &salen);
234: if (ret > -1 && e_addrcmp(sa, &sa2, 42)) {
235: if (cx < 3) {
236: cx++;
237: ret ^= ret;
238: goto try2read; /* wait for known address */
239: } else
240: return -1;
241: }
242: break;
243: default:
244: rpc_SetErr(EINVAL, "Invalid argument(s)!");
245: return -1;
246: }
247: if (ret < 0) {
248: LOGERR;
249: return -1;
250: }
251: if (!ret) /* EOF */
252: return 0;
253:
254: /* check RPC packet header */
255: if (type == SOCK_RAW) {
256: hlen = sa->sa.sa_family == AF_INET ?
257: sizeof(struct ip) : sizeof(struct ip6_hdr);
258: ret -= hlen;
259: if (ret > 0)
260: memmove(buf, buf + hlen, blen - hlen);
261: }
262:
263: /* 1st read for RPC header */
264: if (ret < sizeof(struct tagRPCCall) || ret < ntohl(rpc->call_len)) {
265: rpc_SetErr(ERPCMISMATCH, "Short RPC packet %d bytes", ret);
266: return -1;
267: }
268: /* check for loop request */
269: if (!(rpc->call_io & RPC_ACK)) {
270: if (cx < 3) {
271: cx++;
272: ret ^= ret;
273: goto try2read; /* wait for known address */
274: } else {
275: rpc_SetErr(ERPCMISMATCH, "Loop in RPC communication");
276: return -1;
277: }
278: }
279:
280: return ret;
281: }
282:
283: /*
284: * rpc_Write() - RPC write operation
285: *
286: * @sock = socket
287: * @type = type of socket
288: * @flags = send flags
289: * @sa = send to client address, if you use udp protocol
290: * @pkt = RPC packet
291: * @blen = buffer length
292: * return: -1 error, 0 EOF or >0 written bytes into buffer
293: */
294: ssize_t
295: rpc_Write(int sock, int type, int flags, sockaddr_t * __restrict sa,
296: ait_val_t * __restrict pkt, size_t blen)
297: {
298: struct pollfd pfd;
299: int ret = 0;
300: u_char *buf = AIT_GET_BUF(pkt);
301: #ifndef __linux__
302: ait_val_t v = AIT_VAL_INIT;
303: struct ether_header *eh;
304: #endif
305:
306:
307: pfd.fd = sock;
308: pfd.events = POLLOUT;
309: if ((ret = poll(&pfd, 1, DEF_RPC_TIMEOUT * 1000)) < 1 ||
310: pfd.revents & (POLLERR | POLLHUP | POLLNVAL)) {
311: if (ret > 0)
312: rpc_SetErr(EPIPE, "Disconnected RPC session\n");
313: else
314: LOGERR;
315: return -1;
316: }
317:
318: switch (type) {
319: case SOCK_STREAM:
320: ret = send(sock, buf, blen, flags);
321: break;
322: case SOCK_EXT:
323: ret = write(sock, buf, blen);
324: break;
325: #ifndef __linux__
326: case SOCK_BPF:
327: if (!sa) {
328: rpc_SetErr(EINVAL, "Invalid argument(s)!");
329: return -1;
330: }
331:
332: AIT_SET_BUF(&v, NULL, blen + sizeof(struct ether_header));
333: eh = (struct ether_header*) AIT_GET_BUF(&v);
334: memcpy(eh->ether_dhost, LLADDR(&sa->sdl), ETHER_ADDR_LEN);
335: eh->ether_type = htons(RPC_DEFPORT);
336: memcpy(eh + 1, buf, blen);
337: blen += sizeof(struct ether_header);
338:
339: ret = write(sock, AIT_GET_BUF(&v), AIT_LEN(&v));
340:
341: AIT_FREE_VAL(&v);
342: break;
343: #endif
344: case SOCK_RAW:
345: case SOCK_DGRAM:
346: if (!sa) {
347: rpc_SetErr(EINVAL, "Invalid argument(s)!");
348: return -1;
349: }
350:
351: ret = sendto(sock, buf, blen, flags, &sa->sa, sizeof sa->sa);
352: break;
353: default:
354: rpc_SetErr(EINVAL, "Invalid argument(s)!");
355: return -1;
356: }
357: if (ret < 0) {
358: LOGERR;
359: return -1;
360: }
361: if (!ret) /* EOF */
362: return 0;
363:
364: if (ret != blen) {
365: rpc_SetErr(EPROCUNAVAIL, "RPC request, should be send %d bytes, "
366: "really sended %d bytes", blen, ret);
367: return -1;
368: }
369:
370: return ret;
371: }
372:
373: /*
374: * rpc_pktFreeSpace() - Get free space for payload into RPC packet
375: *
376: * @c = RPC client
377: * return: remains free bytes from packet
378: */
379: size_t
380: rpc_pktFreeSpace(rpc_cli_t * __restrict c)
381: {
382: return (sizeof(struct tagRPCCall) + ait_resideVars(RPC_RETVARS(c)));
383: }
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