| 1 | /* -*-c-*- |
| 2 | * |
| 3 | * $Id: conn.c,v 1.10 2004/04/08 01:36:11 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 | /*----- Header files ------------------------------------------------------*/ |
| 31 | |
| 32 | #include <errno.h> |
| 33 | #include <limits.h> |
| 34 | #include <stdio.h> |
| 35 | #include <stdlib.h> |
| 36 | #include <string.h> |
| 37 | |
| 38 | #include <sys/types.h> |
| 39 | #include <sys/socket.h> |
| 40 | |
| 41 | #include <unistd.h> |
| 42 | #include <fcntl.h> |
| 43 | |
| 44 | #include "conn.h" |
| 45 | #include "sel.h" |
| 46 | |
| 47 | /*----- Main code ---------------------------------------------------------*/ |
| 48 | |
| 49 | /* --- @conn_connect@ --- * |
| 50 | * |
| 51 | * Arguments: @int fd@ = file descriptor to try to connect |
| 52 | * @unsigned mode@ = what we can do to the file |
| 53 | * @void *p@ = pointer to connection context |
| 54 | * |
| 55 | * Returns: --- |
| 56 | * |
| 57 | * Use: Handles select results for pending connections. |
| 58 | */ |
| 59 | |
| 60 | static void conn_connect(int fd, unsigned mode, void *p) |
| 61 | { |
| 62 | #ifndef PATH_MAX |
| 63 | # define PATH_MAX 1024 |
| 64 | #endif |
| 65 | |
| 66 | conn *c = p; |
| 67 | char buf[PATH_MAX + 8]; /* Big enough */ |
| 68 | size_t sinsz; |
| 69 | |
| 70 | sinsz = sizeof(buf); |
| 71 | sel_rmfile(&c->writer); |
| 72 | if (getpeername(fd, (struct sockaddr *)buf, &sinsz) < 0) { |
| 73 | int err; |
| 74 | size_t errsz = sizeof(err); |
| 75 | if (getsockopt(fd, SOL_SOCKET, SO_ERROR, &err, &errsz) == 0) |
| 76 | errno = err; |
| 77 | close(fd); |
| 78 | c->func(-1, c->p); |
| 79 | } else |
| 80 | c->func(fd, c->p); |
| 81 | } |
| 82 | |
| 83 | /* --- @conn_fd@ --- * |
| 84 | * |
| 85 | * Arguments: @conn *c@ = pointer to connection block |
| 86 | * @sel_state *s@ = pointer to select state to attach to |
| 87 | * @int fd@ = file descriptor of socket |
| 88 | * @void (*func)(int fd, void *p) = handler function |
| 89 | * @void *p@ = argument for the handler function |
| 90 | * |
| 91 | * Returns: --- |
| 92 | * |
| 93 | * Use: Sets up a nonblocking connect job. The socket should have a |
| 94 | * connect pending for it already. |
| 95 | */ |
| 96 | |
| 97 | void conn_fd(conn *c, sel_state *s, int fd, |
| 98 | void (*func)(int /*fd*/, void */*p*/), |
| 99 | void *p) |
| 100 | { |
| 101 | c->func = func; |
| 102 | c->p = p; |
| 103 | sel_initfile(s, &c->writer, fd, SEL_WRITE, conn_connect, c); |
| 104 | sel_addfile(&c->writer); |
| 105 | } |
| 106 | |
| 107 | /* --- @conn_init@ --- * |
| 108 | * |
| 109 | * Arguments: @conn *c@ = pointer to connection block |
| 110 | * @sel_state *s@ = pointer to select state to attach to |
| 111 | * @int fd@ = file descriptor of socket to connect |
| 112 | * @struct sockaddr *dst@ = destination address |
| 113 | * @int dsz@ = size of destination address |
| 114 | * @void (*func)(int fd, void *p) = handler function |
| 115 | * @void *p@ = argument for the handler function |
| 116 | * |
| 117 | * Returns: Zero on success, nonzero on failure. |
| 118 | * |
| 119 | * Use: Sets up a nonblocking connect job. The socket should already |
| 120 | * be bound if you care about that sort of thing. When the |
| 121 | * connection completes, the handler function is called with the |
| 122 | * connected socket as an argument. If the connect fails rather |
| 123 | * than completes, the socket is closed, and the handler is |
| 124 | * informed of this by being passed a negative file descriptor. |
| 125 | * In either case, the select job is then removed. |
| 126 | */ |
| 127 | |
| 128 | int conn_init(conn *c, sel_state *s, int fd, |
| 129 | struct sockaddr *dst, int dsz, |
| 130 | void (*func)(int /*fd*/, void */*p*/), |
| 131 | void *p) |
| 132 | { |
| 133 | int f; |
| 134 | |
| 135 | if ((f = fcntl(fd, F_GETFL)) < 0 || fcntl(fd, F_SETFL, f | O_NONBLOCK)) |
| 136 | goto fail; |
| 137 | |
| 138 | if (!connect(fd, dst, dsz)) |
| 139 | func(fd, p); |
| 140 | else if (errno != EINPROGRESS) |
| 141 | goto fail; |
| 142 | else |
| 143 | conn_fd(c, s, fd, func, p); |
| 144 | return (0); |
| 145 | |
| 146 | fail: |
| 147 | close(fd); |
| 148 | return (-1); |
| 149 | } |
| 150 | |
| 151 | /* --- @conn_kill@ --- * |
| 152 | * |
| 153 | * Arguments: @conn *c@ = pointer to connection to dispose of |
| 154 | * |
| 155 | * Returns: --- |
| 156 | * |
| 157 | * Use: Disposes of a connection when it's not wanted any more. |
| 158 | */ |
| 159 | |
| 160 | void conn_kill(conn *c) |
| 161 | { |
| 162 | if (c->writer.fd != -1) { |
| 163 | close(c->writer.fd); |
| 164 | sel_rmfile(&c->writer); |
| 165 | c->writer.fd = -1; |
| 166 | } |
| 167 | } |
| 168 | |
| 169 | /*----- That's all, folks -------------------------------------------------*/ |