Annotation of libaitrpc/src/cli.c, revision 1.10.2.2

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 $
1.10.2.2! misho       6: * $Id: cli.c,v 1.10.2.1 2012/05/28 08:02:00 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: 
1.7       misho      15: Copyright 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012
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: /*
1.7       misho      50:  * rpc_cli_openBLOBClient() - Connect to BLOB Server
                     51:  *
1.2       misho      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;
1.4       misho      60: 
1.10      misho      61:        if (!rpccli) {
1.7       misho      62:                rpc_SetErr(EINVAL, "Invalid parameters can`t connect to BLOB server");
1.2       misho      63:                return NULL;
                     64:        }
                     65: 
1.10.2.1  misho      66:        cli = io_malloc(sizeof(rpc_cli_t));
1.2       misho      67:        if (!cli) {
                     68:                LOGERR;
                     69:                return NULL;
                     70:        } else
                     71:                memcpy(cli, rpccli, sizeof(rpc_cli_t));
                     72: 
1.10      misho      73:        memcpy(&cli->cli_sa, &rpccli->cli_sa, sizeof(io_sockaddr_t));
                     74:        switch (cli->cli_sa.sa.sa_family) {
1.4       misho      75:                case AF_INET:
1.10      misho      76:                        cli->cli_sa.sin.sin_port = 
                     77:                                htons(Port ? Port : ntohs(cli->cli_sa.sin.sin_port) + 1);
1.4       misho      78:                        break;
                     79:                case AF_INET6:
1.10      misho      80:                        cli->cli_sa.sin6.sin6_port = 
                     81:                                htons(Port ? Port : ntohs(cli->cli_sa.sin6.sin6_port) + 1);
1.4       misho      82:                        break;
                     83:                case AF_LOCAL:
1.10      misho      84:                        strlcat(cli->cli_sa.sun.sun_path, ".blob", sizeof cli->cli_sa.sun.sun_path);
1.4       misho      85:                        break;
1.10      misho      86:                default:
                     87:                        rpc_SetErr(EINVAL, "Invalid socket type %d", cli->cli_sa.sa.sa_family);
                     88:                        return NULL;
1.2       misho      89:        }
1.10      misho      90: 
                     91:        AIT_COPY_VAL(&cli->cli_buf, &rpccli->cli_buf);
1.2       misho      92: 
1.4       misho      93:        /* connect to BLOB server */
1.6       misho      94:        cli->cli_sock = socket(cli->cli_sa.sa.sa_family, SOCK_STREAM, 0);
1.2       misho      95:        if (cli->cli_sock == -1) {
                     96:                LOGERR;
1.10.2.1  misho      97:                io_free(cli);
1.2       misho      98:                return NULL;
                     99:        }
1.6       misho     100:        if (connect(cli->cli_sock, &cli->cli_sa.sa, cli->cli_sa.sa.sa_len) == -1) {
1.2       misho     101:                LOGERR;
1.5       misho     102:                close(cli->cli_sock);
1.10.2.1  misho     103:                io_free(cli);
1.2       misho     104:                return NULL;
1.10      misho     105:        } else
                    106:                fcntl(cli->cli_sock, F_SETFL, fcntl(cli->cli_sock, F_GETFL) | O_NONBLOCK);
1.2       misho     107: 
                    108:        return cli;
                    109: }
                    110: 
                    111: /*
1.7       misho     112:  * rpc_cli_closeBLOBClient() - Close connection to BLOB server and free resources
                    113:  *
1.2       misho     114:  * @cli = BLOB Client session
                    115:  * return: none
                    116:  */
                    117: void
1.10      misho     118: rpc_cli_closeBLOBClient(rpc_cli_t ** __restrict cli)
1.2       misho     119: {
1.10      misho     120:        if (!cli || !*cli)
1.2       misho     121:                return;
                    122: 
1.10      misho     123:        shutdown((*cli)->cli_sock, SHUT_RDWR);
                    124:        close((*cli)->cli_sock);
                    125: 
                    126:        AIT_FREE_VAL(&(*cli)->cli_buf);
1.2       misho     127: 
1.10.2.1  misho     128:        io_free(*cli);
1.10      misho     129:        *cli = NULL;
1.2       misho     130: }
                    131: 
1.10      misho     132: /* -------------------------------------------------------------- */
1.2       misho     133: 
                    134: /*
1.7       misho     135:  * rpc_cli_openClient() - Connect to RPC Server
                    136:  *
1.1       misho     137:  * @ProgID = ProgramID for RPC session request
                    138:  * @ProcID = ProcessID for RPC session request
1.10      misho     139:  * @netBuf = Network buffer length (min:512 bytes), if =0 == BUFSIZ (also meaning max RPC packet)
1.1       misho     140:  * @csHost = Host name or IP address for bind server
                    141:  * @Port = Port for bind server, if Port == 0 default port is selected
                    142:  * return: NULL == error or !=NULL connection to RPC server established
                    143:  */
                    144: rpc_cli_t *
1.10      misho     145: rpc_cli_openClient(u_int ProgID, u_char ProcID, int netBuf, const char *csHost, u_short Port)
1.1       misho     146: {
                    147:        rpc_cli_t *cli = NULL;
1.10.2.2! misho     148:        io_sockaddr_t sa = IO_SOCKADDR_INIT;
1.1       misho     149: 
1.10      misho     150:        if (!io_gethostbyname(csHost, Port, &sa))
1.1       misho     151:                return NULL;
                    152:        if (!Port)
                    153:                Port = RPC_DEFPORT;
1.10      misho     154:        if (netBuf < RPC_MIN_BUFSIZ)
1.5       misho     155:                netBuf = BUFSIZ;
1.10      misho     156:        else
                    157:                netBuf = io_align(netBuf, 1);   /* align netBuf length */
                    158: 
                    159: #ifdef HAVE_SRANDOMDEV
                    160:        srandomdev();
                    161: #else
                    162:        time_t tim;
                    163: 
                    164:        srandom((time(&tim) ^ getpid()));
                    165: #endif
1.1       misho     166: 
1.10.2.1  misho     167:        cli = io_malloc(sizeof(rpc_cli_t));
1.1       misho     168:        if (!cli) {
                    169:                LOGERR;
                    170:                return NULL;
                    171:        } else
                    172:                memset(cli, 0, sizeof(rpc_cli_t));
1.5       misho     173: 
1.10      misho     174:        /* build session */
1.10.2.1  misho     175:        cli->cli_parent = io_malloc(sizeof(rpc_sess_t));
1.1       misho     176:        if (!cli->cli_parent) {
                    177:                LOGERR;
1.10.2.1  misho     178:                io_free(cli);
1.1       misho     179:                return NULL;
                    180:        } else {
                    181:                ((rpc_sess_t*) cli->cli_parent)->sess_version = RPC_VERSION;
                    182:                ((rpc_sess_t*) cli->cli_parent)->sess_program = ProgID;
                    183:                ((rpc_sess_t*) cli->cli_parent)->sess_process = ProcID;
                    184:        }
                    185: 
1.6       misho     186:        memcpy(&cli->cli_sa, &sa, sizeof cli->cli_sa);
1.10      misho     187:        AIT_SET_BUF2(&cli->cli_buf, 0, netBuf);
1.4       misho     188: 
                    189:        /* connect to RPC server */
1.10      misho     190:        cli->cli_sock = socket(cli->cli_sa.sa.sa_family, SOCK_STREAM, 0);
1.1       misho     191:        if (cli->cli_sock == -1) {
                    192:                LOGERR;
1.10      misho     193:                AIT_FREE_VAL(&cli->cli_buf);
1.10.2.1  misho     194:                io_free(cli->cli_parent);
                    195:                io_free(cli);
1.5       misho     196:                return NULL;
                    197:        }
1.6       misho     198:        if (connect(cli->cli_sock, &cli->cli_sa.sa, cli->cli_sa.sa.sa_len) == -1) {
1.1       misho     199:                LOGERR;
1.10      misho     200:                AIT_FREE_VAL(&cli->cli_buf);
1.5       misho     201:                close(cli->cli_sock);
1.10.2.1  misho     202:                io_free(cli->cli_parent);
                    203:                io_free(cli);
1.1       misho     204:                return NULL;
1.10      misho     205:        } else
                    206:                fcntl(cli->cli_sock, F_SETFL, fcntl(cli->cli_sock, F_GETFL) | O_NONBLOCK);
1.1       misho     207: 
                    208:        return cli;
                    209: }
                    210: 
                    211: /*
1.7       misho     212:  * rpc_cli_closeClient() - Close connection to RPC server and free resources
                    213:  *
1.1       misho     214:  * @cli = RPC Client session
                    215:  * return: none
                    216:  */
                    217: void
1.10      misho     218: rpc_cli_closeClient(rpc_cli_t ** __restrict cli)
1.1       misho     219: {
1.10      misho     220:        if (!cli || !*cli)
1.1       misho     221:                return;
                    222: 
1.10      misho     223:        shutdown((*cli)->cli_sock, SHUT_RDWR);
                    224:        close((*cli)->cli_sock);
                    225: 
                    226:        AIT_FREE_VAL(&(*cli)->cli_buf);
                    227: 
                    228:        if ((*cli)->cli_parent)
1.10.2.1  misho     229:                io_free((*cli)->cli_parent);
1.1       misho     230: 
1.10.2.1  misho     231:        io_free(*cli);
1.10      misho     232:        *cli = NULL;
1.1       misho     233: }
                    234: 
                    235: 
                    236: /*
1.7       misho     237:  * rpc_cli_execCall() - Execute RPC call
                    238:  *
1.1       misho     239:  * @cli = RPC Client session
1.8       misho     240:  * @noreply = We not want RPC reply
1.10      misho     241:  * @tag = Function tag for execution
                    242:  * @in_vars = IN RPC call array of rpc values, may be NULL
                    243:  * @out_vars = OUT returned array of rpc values, if !=NULL must be free after use with io_freeVars()
1.1       misho     244:  * return: -1 error or != -1 ok result
                    245:  */
                    246: int
1.10      misho     247: rpc_cli_execCall(rpc_cli_t *cli, int noreply, u_short tag, 
1.5       misho     248:                array_t * __restrict in_vars, array_t ** __restrict out_vars)
1.1       misho     249: {
1.5       misho     250:        struct tagRPCCall *rpc;
1.7       misho     251:        int ret = 0, wlen = sizeof(struct tagRPCCall);
1.10      misho     252:        uint16_t crc;
                    253:        u_char *buf;
1.9       misho     254:        struct pollfd pfd;
1.1       misho     255: 
1.10      misho     256:        if (!cli) {
1.7       misho     257:                rpc_SetErr(EINVAL, "Can`t execute call because parameter is null or invalid!");
1.1       misho     258:                return -1;
1.10      misho     259:        } else
                    260:                buf = AIT_GET_BUF(&cli->cli_buf);
1.5       misho     261:        if (out_vars)
                    262:                *out_vars = NULL;
                    263: 
1.4       misho     264:        /* prepare RPC call */
1.5       misho     265:        rpc = (struct tagRPCCall*) buf;
1.6       misho     266:        rpc_addPktSession(&rpc->call_session, cli->cli_parent);
                    267:        rpc->call_argc = htons(io_arraySize(in_vars));
1.10      misho     268:        rpc->call_tag = htons(tag);
                    269:        rpc->call_seq = htons(random() % USHRT_MAX);
1.5       misho     270: 
1.8       misho     271:        /* set reply */
                    272:        rpc->call_req.flags = noreply ? RPC_NOREPLY : RPC_REPLY;
                    273: 
1.6       misho     274:        if (io_arraySize(in_vars)) {
1.5       misho     275:                /* marshaling variables */
1.10      misho     276:                ret = io_vars2buffer(buf + wlen, AIT_LEN(&cli->cli_buf) - wlen, in_vars);
1.5       misho     277:                if (ret == -1) {
1.7       misho     278:                        rpc_SetErr(EBADRPC, "Failed to prepare RPC packet values");
                    279:                        return -1;
1.3       misho     280:                } else
1.7       misho     281:                        wlen += ret;
1.1       misho     282:        }
1.4       misho     283: 
1.10      misho     284:        /* total packet length */
1.8       misho     285:        rpc->call_len = htons(wlen);
                    286: 
1.7       misho     287:        /* calculate CRC */
                    288:        rpc->call_crc ^= rpc->call_crc;
1.8       misho     289:        rpc->call_crc = htons(crcFletcher16((u_short*) buf, wlen / 2));
1.7       misho     290: 
1.9       misho     291:        pfd.fd = cli->cli_sock;
1.10      misho     292:        pfd.events = POLLOUT;
                    293:        if ((ret = poll(&pfd, 1, DEF_RPC_TIMEOUT * 1000)) < 1 || 
1.9       misho     294:                        pfd.revents & (POLLERR | POLLHUP | POLLNVAL)) {
1.4       misho     295:                if (ret)
1.1       misho     296:                        LOGERR;
1.4       misho     297:                else
1.10      misho     298:                        rpc_SetErr(ETIMEDOUT, "Timeout, can't send to RPC server");
1.1       misho     299:                return -1;
                    300:        }
1.10      misho     301:        do {
                    302:                if ((ret = send(cli->cli_sock, buf, wlen, MSG_NOSIGNAL)) == -1) {
                    303:                        if (errno == EAGAIN)
                    304:                                continue;
                    305:                        LOGERR;
                    306:                        return -1;
                    307:                } else if (ret != wlen) {
                    308:                        rpc_SetErr(EPROCUNAVAIL, "RPC request, should be send %d bytes, "
                    309:                                        "really sended %d bytes", wlen, ret);
                    310:                        return -1;
                    311:                }
                    312:        } while (0);
                    313: 
                    314:        if (noreply)    /* we not want reply */
1.1       misho     315:                return 0;
1.10      misho     316: 
                    317:        wlen = 0;
                    318:        /* reply from RPC server */
                    319:        pfd.events = POLLIN | POLLPRI;
                    320:        do {
                    321:                if ((ret = poll(&pfd, 1, DEF_RPC_TIMEOUT * 1000)) < 1 || 
                    322:                                pfd.revents & (POLLERR | POLLHUP | POLLNVAL)) {
                    323:                        if (ret)
                    324:                                LOGERR;
                    325:                        else {
                    326:                                if (wlen++ < 7)
                    327:                                        continue;
                    328:                                else
                    329:                                        rpc_SetErr(ETIMEDOUT, "Timeout, no answer from RPC server");
                    330:                        }
                    331:                        return -1;
                    332:                }
                    333:        } while (0);
                    334:        do {
                    335:                memset(buf, 0, AIT_LEN(&cli->cli_buf));
                    336:                if ((ret = recv(cli->cli_sock, buf, AIT_LEN(&cli->cli_buf), 0)) < 1) {
                    337:                        if (ret) {
                    338:                                if (errno == EAGAIN)
                    339:                                        continue;
                    340:                                else
                    341:                                        LOGERR;
                    342:                        }
                    343:                        return -1;
                    344:                }
                    345:        } while (0);
1.7       misho     346:        if (ret < sizeof(struct tagRPCCall)) {
1.10      misho     347:                rpc_SetErr(ERPCMISMATCH, "Short RPC packet %d bytes", ret);
1.8       misho     348:                return -1;
1.7       misho     349:        }
1.8       misho     350: 
                    351:        /* calculate CRC */
                    352:        crc = ntohs(rpc->call_crc);
                    353:        rpc->call_crc ^= rpc->call_crc;
1.10      misho     354:        if (crc != crcFletcher16((u_short*) buf, ntohs(rpc->call_len) / 2)) {
1.8       misho     355:                rpc_SetErr(ERPCMISMATCH, "Bad CRC RPC packet");
                    356:                return -1;
                    357:        }
                    358: 
1.3       misho     359:        /* check RPC packet session info */
1.7       misho     360:        if (rpc_chkPktSession(&rpc->call_session, cli->cli_parent)) {
1.10      misho     361:                rpc_SetErr(ERPCMISMATCH, "Get invalid RPC session");
1.8       misho     362:                return -1;
1.2       misho     363:        } else
1.7       misho     364:                wlen = sizeof(struct tagRPCCall);
1.10      misho     365:        if (ntohs(rpc->call_tag) != tag) {
                    366:                rpc_SetErr(ERPCMISMATCH, "Get wrong RPC reply");
1.8       misho     367:                return -1;
1.6       misho     368:        }
1.10      misho     369:        if (ntohl(rpc->call_rep.eno) && ntohl(rpc->call_rep.ret) == -1) {
1.8       misho     370:                rpc_SetErr(ntohl(rpc->call_rep.eno), "Server side: retcode=%d #%d %s", 
1.7       misho     371:                                ntohl(rpc->call_rep.ret), ntohl(rpc->call_rep.eno), 
                    372:                                strerror(ntohl(rpc->call_rep.eno)));
1.8       misho     373:                return -1;
1.1       misho     374:        }
1.10      misho     375:        if (ntohs(rpc->call_argc) * sizeof(ait_val_t) > AIT_LEN(&cli->cli_buf) - wlen) {
1.8       misho     376:                rpc_SetErr(EMSGSIZE, "Reply RPC packet is too long ...");
                    377:                return -1;
1.5       misho     378:        }
                    379: 
                    380:        /* RPC is OK! Go de-marshaling variables ... */
1.10      misho     381:        if (out_vars && ntohs(rpc->call_argc)) {
                    382:                *out_vars = io_buffer2vars(buf + wlen, AIT_LEN(&cli->cli_buf) - wlen, 
1.7       misho     383:                                ntohs(rpc->call_argc), 0);
1.4       misho     384:                if (!*out_vars) {
1.10      misho     385:                        rpc_SetErr(io_GetErrno(), "%s", io_GetError());
1.1       misho     386:                        return -1;
1.5       misho     387:                }
1.1       misho     388:        }
                    389: 
1.7       misho     390:        ret = ntohl(rpc->call_rep.ret);
1.10      misho     391:        return ret;
                    392: }
                    393: 
                    394: /*
                    395:  * rpc_cli_ping() - Ping RPC server
                    396:  *
                    397:  * @cli = connected client
                    398:  * return: -1 error or !=-1 ping seq id
                    399:  */
                    400: inline int
                    401: rpc_cli_ping(rpc_cli_t *cli)
                    402: {
                    403:        int ret = 0;
                    404:        array_t *arr = NULL;
                    405: 
                    406:        if (!cli)
                    407:                return -1;
                    408: 
                    409:        if (rpc_cli_execCall(cli, RPC_REPLY, CALL_SRVPING, NULL, &arr))
                    410:                return -1;
                    411:        else
                    412:                ret = AIT_GET_U16(io_array(arr, 0, ait_val_t*));
                    413:        io_freeVars(&arr);
                    414: 
1.5       misho     415:        return ret;
1.1       misho     416: }

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