| 1 | /* -*-c-*- |
| 2 | * |
| 3 | * $Id: conn.c,v 1.4 1999/07/26 23:21:02 mdw Exp $ |
| 4 | * |
| 5 | * Nonblocking connect handling |
| 6 | * |
| 7 | * (c) 1999 Straylight/Edgeware |
| 8 | */ |
| 9 | |
| 10 | /*----- Licensing notice --------------------------------------------------* |
| 11 | * |
| 12 | * This file is part of the mLib utilities library. |
| 13 | * |
| 14 | * mLib is free software; you can redistribute it and/or modify |
| 15 | * it under the terms of the GNU Library General Public License as |
| 16 | * published by the Free Software Foundation; either version 2 of the |
| 17 | * License, or (at your option) any later version. |
| 18 | * |
| 19 | * mLib is distributed in the hope that it will be useful, |
| 20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 22 | * GNU Library General Public License for more details. |
| 23 | * |
| 24 | * You should have received a copy of the GNU Library General Public |
| 25 | * License along with mLib; if not, write to the Free |
| 26 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, |
| 27 | * MA 02111-1307, USA. |
| 28 | */ |
| 29 | |
| 30 | /*----- Revision history --------------------------------------------------* |
| 31 | * |
| 32 | * $Log: conn.c,v $ |
| 33 | * Revision 1.4 1999/07/26 23:21:02 mdw |
| 34 | * Bug fix: remove the selector before doing the callback, in case client |
| 35 | * adds a writer for the connected socket. |
| 36 | * |
| 37 | * Revision 1.3 1999/05/23 12:12:37 mdw |
| 38 | * Interface change to make the `conn' selector useful for generic stream |
| 39 | * sockets rather than just IPv4 ones. |
| 40 | * |
| 41 | * Revision 1.2 1999/05/15 10:33:32 mdw |
| 42 | * Fix copyright notices. |
| 43 | * |
| 44 | * Revision 1.1 1999/05/14 21:01:14 mdw |
| 45 | * Integrated `select' handling bits from the background resolver project. |
| 46 | * |
| 47 | */ |
| 48 | |
| 49 | /*----- Header files ------------------------------------------------------*/ |
| 50 | |
| 51 | #include <errno.h> |
| 52 | #include <limits.h> |
| 53 | #include <stdio.h> |
| 54 | #include <stdlib.h> |
| 55 | #include <string.h> |
| 56 | |
| 57 | #include <sys/types.h> |
| 58 | #include <sys/socket.h> |
| 59 | |
| 60 | #include <unistd.h> |
| 61 | #include <fcntl.h> |
| 62 | |
| 63 | #include "conn.h" |
| 64 | #include "sel.h" |
| 65 | |
| 66 | /*----- Main code ---------------------------------------------------------*/ |
| 67 | |
| 68 | /* --- @conn_connect@ --- * |
| 69 | * |
| 70 | * Arguments: @int fd@ = file descriptor to try to connect |
| 71 | * @unsigned mode@ = what we can do to the file |
| 72 | * @void *p@ = pointer to connection context |
| 73 | * |
| 74 | * Returns: --- |
| 75 | * |
| 76 | * Use: Handles select results for pending connections. |
| 77 | */ |
| 78 | |
| 79 | static void conn_connect(int fd, unsigned mode, void *p) |
| 80 | { |
| 81 | #ifndef PATH_MAX |
| 82 | # define PATH_MAX 1024 |
| 83 | #endif |
| 84 | |
| 85 | conn *c = p; |
| 86 | char buf[PATH_MAX + 8]; /* Big enough */ |
| 87 | int sinsz; |
| 88 | |
| 89 | sinsz = sizeof(buf); |
| 90 | sel_rmfile(&c->writer); |
| 91 | if (getpeername(fd, (struct sockaddr *)buf, &sinsz) < 0) { |
| 92 | int err; |
| 93 | int errsz = sizeof(err); |
| 94 | if (getsockopt(fd, SOL_SOCKET, SO_ERROR, &err, &errsz) == 0) |
| 95 | errno = err; |
| 96 | close(fd); |
| 97 | c->func(-1, c->p); |
| 98 | } else |
| 99 | c->func(fd, c->p); |
| 100 | } |
| 101 | |
| 102 | /* --- @conn_init@ --- * |
| 103 | * |
| 104 | * Arguments: @conn *c@ = pointer to connection block |
| 105 | * @sel_state *s@ = pointer to select state to attach to |
| 106 | * @int fd@ = file descriptor of socket to connect |
| 107 | * @struct sockaddr *dst@ = destination address |
| 108 | * @int dsz@ = size of destination address |
| 109 | * @void (*func)(int fd, void *p) = handler function |
| 110 | * @void *p@ = argument for the handler function |
| 111 | * |
| 112 | * Returns: --- |
| 113 | * |
| 114 | * Use: Sets up a nonblocking connect job. The socket should already |
| 115 | * be bound if you care about that sort of thing. When the |
| 116 | * connection completes, the handler function is called with the |
| 117 | * connected socket as an argument. If the connect fails rather |
| 118 | * than completes, the socket is closed, and the handler is |
| 119 | * informed of this by being passed a negative file descriptor. |
| 120 | * In either case, the select job is then removed. |
| 121 | */ |
| 122 | |
| 123 | void conn_init(conn *c, sel_state *s, int fd, |
| 124 | struct sockaddr *dst, int dsz, |
| 125 | void (*func)(int /*fd*/, void */*p*/), |
| 126 | void *p) |
| 127 | { |
| 128 | int f; |
| 129 | |
| 130 | if ((f = fcntl(fd, F_GETFL)) < 0 || |
| 131 | fcntl(fd, F_SETFL, f | O_NONBLOCK)) |
| 132 | goto fail; |
| 133 | |
| 134 | if (connect(fd, dst, dsz) < 0) { |
| 135 | if (errno != EINPROGRESS) |
| 136 | goto fail; |
| 137 | c->func = func; |
| 138 | c->p = p; |
| 139 | sel_initfile(s, &c->writer, fd, SEL_WRITE, conn_connect, c); |
| 140 | sel_addfile(&c->writer); |
| 141 | } else |
| 142 | func(fd, p); |
| 143 | |
| 144 | return; |
| 145 | |
| 146 | /* --- Something went pear-shaped --- */ |
| 147 | |
| 148 | fail: |
| 149 | close(fd); |
| 150 | func(-1, p); |
| 151 | } |
| 152 | |
| 153 | /* --- @conn_kill@ --- * |
| 154 | * |
| 155 | * Arguments: @conn *c@ = pointer to connection to dispose of |
| 156 | * |
| 157 | * Returns: --- |
| 158 | * |
| 159 | * Use: Disposes of a connection when it's not wanted any more. |
| 160 | */ |
| 161 | |
| 162 | void conn_kill(conn *c) |
| 163 | { |
| 164 | if (c->writer.fd != -1) { |
| 165 | close(c->writer.fd); |
| 166 | sel_rmfile(&c->writer); |
| 167 | c->writer.fd = -1; |
| 168 | } |
| 169 | } |
| 170 | |
| 171 | /*----- That's all, folks -------------------------------------------------*/ |