Annotation of libaitrpc/src/aitrpc.c, revision 1.18.2.2
1.1 misho 1: /*************************************************************************
2: * (C) 2010 AITNET ltd - Sofia/Bulgaria - <misho@aitbg.com>
3: * by Michael Pounov <misho@openbsd-bg.org>
4: *
5: * $Author: misho $
1.18.2.2! misho 6: * $Id: aitrpc.c,v 1.18.2.1 2015/06/28 21:40:45 misho Exp $
1.1 misho 7: *
1.2 misho 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:
1.17 misho 15: Copyright 2004 - 2015
1.2 misho 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: */
1.1 misho 46: #include "global.h"
47:
48:
49: #pragma GCC visibility push(hidden)
50:
51: int rpc_Errno;
52: char rpc_Error[STRSIZ];
53:
1.7 misho 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:
1.1 misho 73: #pragma GCC visibility pop
74:
75: // rpc_GetErrno() Get error code of last operation
1.10 misho 76: int
1.1 misho 77: rpc_GetErrno()
78: {
79: return rpc_Errno;
80: }
81:
82: // rpc_GetError() Get error text of last operation
1.10 misho 83: const char *
1.1 misho 84: rpc_GetError()
85: {
86: return rpc_Error;
87: }
88:
89: // rpc_SetErr() Set error to variables for internal use!!!
1.10 misho 90: void
1.1 misho 91: rpc_SetErr(int eno, char *estr, ...)
92: {
93: va_list lst;
94:
95: rpc_Errno = eno;
1.8 misho 96: memset(rpc_Error, 0, sizeof rpc_Error);
1.1 misho 97: va_start(lst, estr);
1.8 misho 98: vsnprintf(rpc_Error, sizeof rpc_Error, estr, lst);
1.1 misho 99: va_end(lst);
100: }
101:
102:
1.4 misho 103: /*
1.6 misho 104: * rpc_chkPktSession() - Check RPC session
1.5 misho 105: *
1.4 misho 106: * @p = packet session
107: * @s = active session
1.6 misho 108: * return: -1, 1, 2, 3 are errors or 0 ok
1.4 misho 109: */
1.10 misho 110: int
1.4 misho 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;
1.9 misho 118: if (p->sess_instance != s->sess_instance)
1.4 misho 119: return 2;
120:
121: return 0;
122: }
123:
124: /*
1.6 misho 125: * rpc_addPktSession() - Prepare session into network format
1.5 misho 126: *
1.4 misho 127: * @p = packet session
1.6 misho 128: * @s = host session
1.4 misho 129: * return: -1 error or 0 ok
130: */
1.10 misho 131: int
1.4 misho 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;
1.9 misho 138: p->sess_instance = s->sess_instance;
1.4 misho 139:
140: return 0;
141: }
1.11 misho 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
1.18 misho 150: * @pkt = RPC packet
1.14 misho 151: * return: -1 error, 0 EOF or or >0 readed bytes into buffer
1.11 misho 152: */
153: ssize_t
1.18 misho 154: rpc_Read(int sock, int type, int flags, sockaddr_t * __restrict sa, ait_val_t * __restrict pkt)
1.11 misho 155: {
156: struct pollfd pfd;
157: sockaddr_t sa2;
158: socklen_t salen;
1.18.2.1 misho 159: int ret = 0, hlen, cx = 0;
1.16 misho 160: struct ether_header *eh;
161: struct bpf_hdr *h;
162: ether_addr_t bcst = {{ [0 ... sizeof bcst - 1] = 0xff }};
1.18 misho 163: u_char *buf = AIT_GET_BUF(pkt);
164: size_t blen = AIT_LEN(pkt);
165: struct tagRPCCall *rpc = (struct tagRPCCall *) buf;
1.18.2.1 misho 166: ait_val_t v = AIT_VAL_INIT;
1.16 misho 167:
1.18.2.1 misho 168: try2read:
1.11 misho 169: pfd.fd = sock;
170: pfd.events = POLLIN | POLLPRI;
171: memset(buf, 0, blen);
172: memset(&sa2, 0, sizeof sa2);
173: salen = sa2.ss.ss_len = sizeof(sockaddr_t);
1.18.2.1 misho 174: if ((ret = poll(&pfd, 1, DEF_RPC_TIMEOUT * 1000)) < 1 ||
175: pfd.revents & (POLLERR | POLLHUP | POLLNVAL)) {
176: if (ret)
177: LOGERR;
178: else
179: rpc_SetErr(ETIMEDOUT, "Timeout reached! Server not respond");
180: return -1;
181: }
182:
183: switch (type) {
184: case SOCK_STREAM:
185: ret = recv(sock, buf, blen, flags);
186: break;
187: case SOCK_EXT:
188: ret = read(sock, buf, blen);
189: break;
190: case SOCK_BPF:
191: if (!sa) {
192: rpc_SetErr(EINVAL, "Invalid argument(s)!");
193: return -1;
194: }
195:
196: AIT_SET_BUF(&v, NULL, blen);
197: h = (struct bpf_hdr*) AIT_GET_BUF(&v);
1.11 misho 198:
1.16 misho 199: ret = read(sock, AIT_GET_BUF(&v), AIT_LEN(&v));
200: if (ret > 0) {
201: ret -= h->bh_hdrlen;
202: if (ret < h->bh_caplen || h->bh_caplen != h->bh_datalen ||
203: ret < ETHER_HDR_LEN + sizeof(struct tagRPCCall)) {
1.18.2.1 misho 204: AIT_FREE_VAL(&v);
1.16 misho 205: if (cx < 3) {
206: cx++;
207: ret ^= ret;
1.18.2.1 misho 208: goto try2read; /* wait for known address */
209: } else
1.16 misho 210: return -1;
211: }
212: ret = h->bh_caplen;
213: eh = (struct ether_header*) (AIT_GET_BUF(&v) + h->bh_hdrlen);
214: ret -= ETHER_HDR_LEN;
215: if (eh->ether_type != ntohs(RPC_DEFPORT)) {
1.18.2.1 misho 216: AIT_FREE_VAL(&v);
1.16 misho 217: if (cx < 3) {
218: cx++;
219: ret ^= ret;
1.18.2.1 misho 220: goto try2read; /* wait for known address */
221: } else
1.16 misho 222: return -1;
223: }
1.18 misho 224:
1.16 misho 225: if (!memcmp(bcst.octet, eh->ether_dhost, sizeof bcst) ||
226: !memcmp(bcst.octet, eh->ether_shost, sizeof bcst)) {
1.18.2.1 misho 227: AIT_FREE_VAL(&v);
1.16 misho 228: if (cx < 3) {
229: cx++;
230: ret ^= ret;
1.18.2.1 misho 231: goto try2read; /* wait for known address */
232: } else
1.16 misho 233: return -1;
234: }
1.18.2.1 misho 235: memcpy(buf, (u_char*) (eh + 1), MIN(ret, blen));
1.16 misho 236: AIT_FREE_VAL(&v);
237: }
1.18.2.1 misho 238: break;
239: case SOCK_RAW:
240: case SOCK_DGRAM:
241: if (!sa) {
242: rpc_SetErr(EINVAL, "Invalid argument(s)!");
243: return -1;
244: }
245:
246: ret = recvfrom(sock, buf, blen, flags, &sa2.sa, &salen);
247: if (ret > -1 && e_addrcmp(sa, &sa2, 42)) {
1.18 misho 248: if (cx < 3) {
249: cx++;
250: ret ^= ret;
1.18.2.1 misho 251: goto try2read; /* wait for known address */
1.18 misho 252: } else
253: return -1;
1.11 misho 254: }
1.18.2.1 misho 255: break;
256: default:
257: rpc_SetErr(EINVAL, "Invalid argument(s)!");
1.13 misho 258: return -1;
1.18.2.1 misho 259: }
260: if (ret < 0) {
261: LOGERR;
262: return -1;
263: }
264: if (!ret) /* EOF */
265: return 0;
1.18 misho 266:
1.18.2.1 misho 267: /* check RPC packet header */
268: if (type == SOCK_RAW) {
269: hlen = sa->sa.sa_family == AF_INET ?
270: sizeof(struct ip) : sizeof(struct ip6_hdr);
271: ret -= hlen;
272: if (ret > 0)
273: memmove(buf, buf + hlen, blen - hlen);
274: }
1.18 misho 275:
1.18.2.1 misho 276: /* 1st read for RPC header */
277: if (ret < sizeof(struct tagRPCCall) || ret < ntohl(rpc->call_len)) {
278: rpc_SetErr(ERPCMISMATCH, "Short RPC packet %d bytes", ret);
279: return -1;
280: }
281: /* check for loop request */
282: if (!(rpc->call_io & RPC_ACK)) {
283: if (cx < 3) {
284: cx++;
285: ret ^= ret;
286: goto try2read; /* wait for known address */
287: } else {
288: rpc_SetErr(ERPCMISMATCH, "Loop in RPC communication");
289: return -1;
1.18 misho 290: }
1.11 misho 291: }
292:
293: return ret;
294: }
295:
296: /*
297: * rpc_Write() - RPC write operation
298: *
299: * @sock = socket
300: * @type = type of socket
301: * @flags = send flags
302: * @sa = send to client address, if you use udp protocol
1.18 misho 303: * @pkt = RPC packet
1.11 misho 304: * @blen = buffer length
1.14 misho 305: * return: -1 error, 0 EOF or >0 written bytes into buffer
1.11 misho 306: */
307: ssize_t
308: rpc_Write(int sock, int type, int flags, sockaddr_t * __restrict sa,
1.18 misho 309: ait_val_t * __restrict pkt, size_t blen)
1.11 misho 310: {
311: struct pollfd pfd;
1.18.2.1 misho 312: int ret = 0;
313: u_char *buf = AIT_GET_BUF(pkt);
1.16 misho 314: ait_val_t v = AIT_VAL_INIT;
315: struct ether_header *eh;
316:
1.11 misho 317:
318: pfd.fd = sock;
319: pfd.events = POLLOUT;
1.18.2.1 misho 320: if ((ret = poll(&pfd, 1, DEF_RPC_TIMEOUT * 1000)) < 1 ||
321: pfd.revents & (POLLERR | POLLHUP | POLLNVAL)) {
322: if (ret > 0)
323: rpc_SetErr(EPIPE, "Disconnected RPC session\n");
324: else
325: LOGERR;
326: return -1;
327: }
328:
329: switch (type) {
330: case SOCK_STREAM:
331: ret = send(sock, buf, blen, flags);
332: break;
333: case SOCK_EXT:
334: ret = write(sock, buf, blen);
335: break;
336: case SOCK_BPF:
337: if (!sa) {
338: rpc_SetErr(EINVAL, "Invalid argument(s)!");
339: return -1;
340: }
341:
342: AIT_SET_BUF(&v, NULL, blen + sizeof(struct ether_header));
343: eh = (struct ether_header*) AIT_GET_BUF(&v);
344: memcpy(eh->ether_dhost, LLADDR(&sa->sdl), ETHER_ADDR_LEN);
345: eh->ether_type = htons(RPC_DEFPORT);
346: memcpy(eh + 1, buf, blen);
347: blen += sizeof(struct ether_header);
348:
1.16 misho 349: ret = write(sock, AIT_GET_BUF(&v), AIT_LEN(&v));
1.18.2.1 misho 350:
351: AIT_FREE_VAL(&v);
352: break;
353: case SOCK_RAW:
354: case SOCK_DGRAM:
355: if (!sa) {
356: rpc_SetErr(EINVAL, "Invalid argument(s)!");
357: return -1;
358: }
359:
360: ret = sendto(sock, buf, blen, flags, &sa->sa, sa->sa.sa_len);
361: break;
362: default:
1.13 misho 363: rpc_SetErr(EINVAL, "Invalid argument(s)!");
364: return -1;
1.11 misho 365: }
1.18.2.1 misho 366: if (ret < 0) {
367: LOGERR;
368: return -1;
369: }
370: if (!ret) /* EOF */
371: return 0;
372:
1.13 misho 373: if (ret != blen) {
1.11 misho 374: rpc_SetErr(EPROCUNAVAIL, "RPC request, should be send %d bytes, "
1.16 misho 375: "really sended %d bytes", blen, ret);
1.11 misho 376: return -1;
377: }
378:
379: return ret;
380: }
1.18.2.2! misho 381:
! 382: /*
! 383: * rpc_pktFreeSpace() - Get free space for payload into RPC packet
! 384: *
! 385: * @c = RPC client
! 386: * return: remains free bytes from packet
! 387: */
! 388: size_t
! 389: rpc_pktFreeSpace(rpc_cli_t * __restrict c)
! 390: {
! 391: return (sizeof(struct tagRPCCall) + ait_resideVars(RPC_RETVARS(c)));
! 392: }
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