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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: conn.c,v 1.7 2002/01/13 13:28:44 mdw Exp $ |
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4 | * |
5 | * Nonblocking connect handling |
6 | * |
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7 | * (c) 1999 Straylight/Edgeware |
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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 $ |
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33 | * Revision 1.7 2002/01/13 13:28:44 mdw |
34 | * Rearrange @conn_init@ to be a bit more comprehensible. |
35 | * |
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36 | * Revision 1.6 2001/06/22 19:35:20 mdw |
37 | * Interface change to @conn_init@ -- return error rather than calling the |
38 | * function. This reduces the number of different environments the |
39 | * callback has to cope with, and the old behaviour is easily simulatable |
40 | * with the new, while simulating the new behaviour was awkward and |
41 | * painful. |
42 | * |
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43 | * Revision 1.5 2000/10/08 11:17:26 mdw |
44 | * (conn_connect): Change sizes to be @size_t@. |
45 | * |
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46 | * Revision 1.4 1999/07/26 23:21:02 mdw |
47 | * Bug fix: remove the selector before doing the callback, in case client |
48 | * adds a writer for the connected socket. |
49 | * |
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50 | * Revision 1.3 1999/05/23 12:12:37 mdw |
51 | * Interface change to make the `conn' selector useful for generic stream |
52 | * sockets rather than just IPv4 ones. |
53 | * |
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54 | * Revision 1.2 1999/05/15 10:33:32 mdw |
55 | * Fix copyright notices. |
56 | * |
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57 | * Revision 1.1 1999/05/14 21:01:14 mdw |
58 | * Integrated `select' handling bits from the background resolver project. |
59 | * |
60 | */ |
61 | |
62 | /*----- Header files ------------------------------------------------------*/ |
63 | |
64 | #include <errno.h> |
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65 | #include <limits.h> |
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66 | #include <stdio.h> |
67 | #include <stdlib.h> |
68 | #include <string.h> |
69 | |
70 | #include <sys/types.h> |
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71 | #include <sys/socket.h> |
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72 | |
73 | #include <unistd.h> |
74 | #include <fcntl.h> |
75 | |
76 | #include "conn.h" |
77 | #include "sel.h" |
78 | |
79 | /*----- Main code ---------------------------------------------------------*/ |
80 | |
81 | /* --- @conn_connect@ --- * |
82 | * |
83 | * Arguments: @int fd@ = file descriptor to try to connect |
84 | * @unsigned mode@ = what we can do to the file |
85 | * @void *p@ = pointer to connection context |
86 | * |
87 | * Returns: --- |
88 | * |
89 | * Use: Handles select results for pending connections. |
90 | */ |
91 | |
92 | static void conn_connect(int fd, unsigned mode, void *p) |
93 | { |
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94 | #ifndef PATH_MAX |
95 | # define PATH_MAX 1024 |
96 | #endif |
97 | |
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98 | conn *c = p; |
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99 | char buf[PATH_MAX + 8]; /* Big enough */ |
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100 | size_t sinsz; |
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101 | |
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102 | sinsz = sizeof(buf); |
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103 | sel_rmfile(&c->writer); |
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104 | if (getpeername(fd, (struct sockaddr *)buf, &sinsz) < 0) { |
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105 | int err; |
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106 | size_t errsz = sizeof(err); |
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107 | if (getsockopt(fd, SOL_SOCKET, SO_ERROR, &err, &errsz) == 0) |
108 | errno = err; |
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109 | close(fd); |
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110 | c->func(-1, c->p); |
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111 | } else |
112 | c->func(fd, c->p); |
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113 | } |
114 | |
115 | /* --- @conn_init@ --- * |
116 | * |
117 | * Arguments: @conn *c@ = pointer to connection block |
118 | * @sel_state *s@ = pointer to select state to attach to |
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119 | * @int fd@ = file descriptor of socket to connect |
120 | * @struct sockaddr *dst@ = destination address |
121 | * @int dsz@ = size of destination address |
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122 | * @void (*func)(int fd, void *p) = handler function |
123 | * @void *p@ = argument for the handler function |
124 | * |
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125 | * Returns: Zero on success, nonzero on failure. |
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126 | * |
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127 | * Use: Sets up a nonblocking connect job. The socket should already |
128 | * be bound if you care about that sort of thing. When the |
129 | * connection completes, the handler function is called with the |
130 | * connected socket as an argument. If the connect fails rather |
131 | * than completes, the socket is closed, and the handler is |
132 | * informed of this by being passed a negative file descriptor. |
133 | * In either case, the select job is then removed. |
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134 | */ |
135 | |
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136 | int conn_init(conn *c, sel_state *s, int fd, |
137 | struct sockaddr *dst, int dsz, |
138 | void (*func)(int /*fd*/, void */*p*/), |
139 | void *p) |
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140 | { |
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141 | int f; |
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142 | |
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143 | if ((f = fcntl(fd, F_GETFL)) < 0 || |
144 | fcntl(fd, F_SETFL, f | O_NONBLOCK)) |
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145 | goto fail; |
146 | |
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147 | if (!connect(fd, dst, dsz)) |
148 | func(fd, p); |
149 | else if (errno != EINPROGRESS) |
150 | goto fail; |
151 | else { |
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152 | c->func = func; |
153 | c->p = p; |
154 | sel_initfile(s, &c->writer, fd, SEL_WRITE, conn_connect, c); |
155 | sel_addfile(&c->writer); |
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156 | } |
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157 | return (0); |
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158 | |
159 | /* --- Something went pear-shaped --- */ |
160 | |
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161 | fail: |
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162 | close(fd); |
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163 | return (-1); |
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164 | } |
165 | |
166 | /* --- @conn_kill@ --- * |
167 | * |
168 | * Arguments: @conn *c@ = pointer to connection to dispose of |
169 | * |
170 | * Returns: --- |
171 | * |
172 | * Use: Disposes of a connection when it's not wanted any more. |
173 | */ |
174 | |
175 | void conn_kill(conn *c) |
176 | { |
177 | if (c->writer.fd != -1) { |
178 | close(c->writer.fd); |
179 | sel_rmfile(&c->writer); |
180 | c->writer.fd = -1; |
181 | } |
182 | } |
183 | |
184 | /*----- That's all, folks -------------------------------------------------*/ |