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Annotation of src/usr.bin/talk/ctl_transact.c, Revision 1.13

1.13    ! mestre      1: /*     $OpenBSD: ctl_transact.c,v 1.12 2010/08/12 23:31:29 tedu Exp $  */
1.1       deraadt     2: /*     $NetBSD: ctl_transact.c,v 1.3 1994/12/09 02:14:12 jtc Exp $     */
                      3:
                      4: /*
                      5:  * Copyright (c) 1983, 1993
                      6:  *     The Regents of the University of California.  All rights reserved.
                      7:  *
                      8:  * Redistribution and use in source and binary forms, with or without
                      9:  * modification, are permitted provided that the following conditions
                     10:  * are met:
                     11:  * 1. Redistributions of source code must retain the above copyright
                     12:  *    notice, this list of conditions and the following disclaimer.
                     13:  * 2. Redistributions in binary form must reproduce the above copyright
                     14:  *    notice, this list of conditions and the following disclaimer in the
                     15:  *    documentation and/or other materials provided with the distribution.
1.8       millert    16:  * 3. Neither the name of the University nor the names of its contributors
1.1       deraadt    17:  *    may be used to endorse or promote products derived from this software
                     18:  *    without specific prior written permission.
                     19:  *
                     20:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     21:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     22:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     23:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     24:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     25:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     26:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     27:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     28:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     29:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     30:  * SUCH DAMAGE.
                     31:  */
                     32:
1.13    ! mestre     33: #include <sys/socket.h>
        !            34: #include <netinet/in.h>
        !            35:
1.1       deraadt    36: #include <errno.h>
1.9       deraadt    37: #include <poll.h>
1.13    ! mestre     38:
        !            39: #include "talk.h"
1.1       deraadt    40: #include "talk_ctl.h"
                     41:
                     42: #define CTL_WAIT 2     /* time to wait for a response, in seconds */
                     43:
                     44: /*
                     45:  * SOCKDGRAM is unreliable, so we must repeat messages if we have
1.4       pjanzen    46:  * not received an acknowledgement within a reasonable amount
1.1       deraadt    47:  * of time
                     48:  */
1.4       pjanzen    49: void
1.12      tedu       50: ctl_transact(struct in_addr target, CTL_MSG msg, int type, CTL_RESPONSE *rp)
1.1       deraadt    51: {
1.9       deraadt    52:        struct pollfd pfd[1];
1.4       pjanzen    53:        int nready, cc;
1.1       deraadt    54:
                     55:        msg.type = type;
                     56:        daemon_addr.sin_addr = target;
                     57:        daemon_addr.sin_port = daemon_port;
1.9       deraadt    58:        pfd[0].fd = ctl_sockt;
                     59:        pfd[0].events = POLLIN;
1.1       deraadt    60:
                     61:        /*
                     62:         * Keep sending the message until a response of
                     63:         * the proper type is obtained.
                     64:         */
                     65:        do {
                     66:                /* resend message until a response is obtained */
                     67:                do {
                     68:                        cc = sendto(ctl_sockt, (char *)&msg, sizeof (msg), 0,
                     69:                            (struct sockaddr *)&daemon_addr,
                     70:                            sizeof (daemon_addr));
                     71:                        if (cc != sizeof (msg)) {
                     72:                                if (errno == EINTR)
                     73:                                        continue;
1.6       millert    74:                                quit("Error on write to talk daemon", 1);
1.1       deraadt    75:                        }
1.9       deraadt    76:                        nready = poll(pfd, 1, CTL_WAIT * 1000);
1.1       deraadt    77:                        if (nready < 0) {
                     78:                                if (errno == EINTR)
                     79:                                        continue;
1.6       millert    80:                                quit("Error waiting for daemon response", 1);
1.1       deraadt    81:                        }
                     82:                } while (nready == 0);
                     83:                /*
1.5       millert    84:                 * Keep reading while there are queued messages
1.1       deraadt    85:                 * (this is not necessary, it just saves extra
                     86:                 * request/acknowledgements being sent)
                     87:                 */
                     88:                do {
                     89:                        cc = recv(ctl_sockt, (char *)rp, sizeof (*rp), 0);
                     90:                        if (cc < 0) {
                     91:                                if (errno == EINTR)
                     92:                                        continue;
1.6       millert    93:                                quit("Error on read from talk daemon", 1);
1.1       deraadt    94:                        }
1.9       deraadt    95:                        nready = poll(pfd, 1, 0);
1.1       deraadt    96:                } while (nready > 0 && (rp->vers != TALK_VERSION ||
                     97:                    rp->type != type));
                     98:        } while (rp->vers != TALK_VERSION || rp->type != type);
                     99:        rp->id_num = ntohl(rp->id_num);
                    100: }