| 1 | /* -*-c-*- |
| 2 | * |
| 3 | * $Id: conn.c,v 1.1 1999/05/14 21:01:14 mdw Exp $ |
| 4 | * |
| 5 | * Nonblocking connect handling |
| 6 | * |
| 7 | * (c) 1999 Mark Wooding |
| 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 1.1 1999/05/14 21:01:14 mdw |
| 34 | * Integrated `select' handling bits from the background resolver project. |
| 35 | * |
| 36 | */ |
| 37 | |
| 38 | /*----- Header files ------------------------------------------------------*/ |
| 39 | |
| 40 | #include <errno.h> |
| 41 | #include <stdio.h> |
| 42 | #include <stdlib.h> |
| 43 | #include <string.h> |
| 44 | |
| 45 | #include <sys/types.h> |
| 46 | |
| 47 | #include <sys/socket.h> |
| 48 | #include <netinet/in.h> |
| 49 | |
| 50 | #include <unistd.h> |
| 51 | #include <fcntl.h> |
| 52 | |
| 53 | #include "conn.h" |
| 54 | #include "sel.h" |
| 55 | |
| 56 | /*----- Main code ---------------------------------------------------------*/ |
| 57 | |
| 58 | /* --- @conn_connect@ --- * |
| 59 | * |
| 60 | * Arguments: @int fd@ = file descriptor to try to connect |
| 61 | * @unsigned mode@ = what we can do to the file |
| 62 | * @void *p@ = pointer to connection context |
| 63 | * |
| 64 | * Returns: --- |
| 65 | * |
| 66 | * Use: Handles select results for pending connections. |
| 67 | */ |
| 68 | |
| 69 | static void conn_connect(int fd, unsigned mode, void *p) |
| 70 | { |
| 71 | conn *c = p; |
| 72 | struct sockaddr_in sin; |
| 73 | int sinsz; |
| 74 | |
| 75 | sinsz = sizeof(sin); |
| 76 | if (getpeername(fd, (struct sockaddr *)&sin, &sinsz) < 0) { |
| 77 | int err; |
| 78 | int errsz = sizeof(err); |
| 79 | if (getsockopt(fd, SOL_SOCKET, SO_ERROR, &err, &errsz) == 0) |
| 80 | errno = err; |
| 81 | c->func(-1, c->p); |
| 82 | close(fd); |
| 83 | } else |
| 84 | c->func(fd, c->p); |
| 85 | sel_rmfile(&c->writer); |
| 86 | } |
| 87 | |
| 88 | /* --- @conn_init@ --- * |
| 89 | * |
| 90 | * Arguments: @conn *c@ = pointer to connection block |
| 91 | * @sel_state *s@ = pointer to select state to attach to |
| 92 | * @unsigned long saddr@ = source IP address |
| 93 | * @unsigned short sport@ = source port |
| 94 | * @unsigned long daddr@ = destination IP address |
| 95 | * @unsigned short dport@ = destination port |
| 96 | * @void (*func)(int fd, void *p) = handler function |
| 97 | * @void *p@ = argument for the handler function |
| 98 | * |
| 99 | * Returns: --- |
| 100 | * |
| 101 | * Use: Sets up a nonblocking connect job. |
| 102 | */ |
| 103 | |
| 104 | void conn_init(conn *c, sel_state *s, |
| 105 | unsigned long saddr, |
| 106 | unsigned short sport, |
| 107 | unsigned long daddr, |
| 108 | unsigned long dport, |
| 109 | void (*func)(int /*fd*/, void */*p*/), |
| 110 | void *p) |
| 111 | { |
| 112 | int fd; |
| 113 | |
| 114 | /* --- Make a socket to do the connecting with --- */ |
| 115 | |
| 116 | c->writer.fd = -1; |
| 117 | if ((fd = socket(PF_INET, SOCK_STREAM, 0)) < 0) |
| 118 | goto fail; |
| 119 | |
| 120 | /* --- Make the socket nonblocking --- */ |
| 121 | |
| 122 | { |
| 123 | int f; |
| 124 | |
| 125 | if ((f = fcntl(fd, F_GETFL)) < 0 || |
| 126 | fcntl(fd, F_SETFL, f | O_NONBLOCK)) |
| 127 | goto fail_close; |
| 128 | } |
| 129 | |
| 130 | /* --- Set up the source address and bind it to the socket --- */ |
| 131 | |
| 132 | { |
| 133 | struct sockaddr_in sin; |
| 134 | |
| 135 | memset(&sin, 0, sizeof(sin)); |
| 136 | sin.sin_family = AF_INET; |
| 137 | sin.sin_addr.s_addr = saddr; |
| 138 | sin.sin_port = sport; |
| 139 | if (bind(fd, (struct sockaddr *)&sin, sizeof(sin)) < 0) |
| 140 | goto fail_close; |
| 141 | } |
| 142 | |
| 143 | /* --- Finally, set up the destination and try the connect --- */ |
| 144 | |
| 145 | { |
| 146 | struct sockaddr_in sin; |
| 147 | |
| 148 | memset(&sin, 0, sizeof(sin)); |
| 149 | sin.sin_family = AF_INET; |
| 150 | sin.sin_addr.s_addr = daddr; |
| 151 | sin.sin_port = dport; |
| 152 | if (connect(fd, (struct sockaddr *)&sin, sizeof(sin)) < 0) { |
| 153 | if (errno != EINPROGRESS) |
| 154 | goto fail_close; |
| 155 | c->func = func; |
| 156 | c->p = p; |
| 157 | sel_initfile(s, &c->writer, fd, SEL_WRITE, conn_connect, c); |
| 158 | sel_addfile(&c->writer); |
| 159 | } else |
| 160 | func(fd, p); |
| 161 | } |
| 162 | |
| 163 | /* --- Everything is set up now --- */ |
| 164 | |
| 165 | return; |
| 166 | |
| 167 | /* --- Something went pear-shaped --- */ |
| 168 | |
| 169 | fail_close: |
| 170 | close(fd); |
| 171 | fail: |
| 172 | func(-1, p); |
| 173 | } |
| 174 | |
| 175 | /* --- @conn_kill@ --- * |
| 176 | * |
| 177 | * Arguments: @conn *c@ = pointer to connection to dispose of |
| 178 | * |
| 179 | * Returns: --- |
| 180 | * |
| 181 | * Use: Disposes of a connection when it's not wanted any more. |
| 182 | */ |
| 183 | |
| 184 | void conn_kill(conn *c) |
| 185 | { |
| 186 | if (c->writer.fd != -1) { |
| 187 | close(c->writer.fd); |
| 188 | sel_rmfile(&c->writer); |
| 189 | c->writer.fd = -1; |
| 190 | } |
| 191 | } |
| 192 | |
| 193 | /*----- That's all, folks -------------------------------------------------*/ |