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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: conn.c,v 1.9 2003/10/12 14:54:00 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 1.9 2003/10/12 14:54:00 mdw |
34 | * Finish the work. |
35 | * |
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36 | * Revision 1.8 2003/10/12 14:47:10 mdw |
37 | * New interface for messing with preconnected sockets. |
38 | * |
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39 | * Revision 1.7 2002/01/13 13:28:44 mdw |
40 | * Rearrange @conn_init@ to be a bit more comprehensible. |
41 | * |
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42 | * Revision 1.6 2001/06/22 19:35:20 mdw |
43 | * Interface change to @conn_init@ -- return error rather than calling the |
44 | * function. This reduces the number of different environments the |
45 | * callback has to cope with, and the old behaviour is easily simulatable |
46 | * with the new, while simulating the new behaviour was awkward and |
47 | * painful. |
48 | * |
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49 | * Revision 1.5 2000/10/08 11:17:26 mdw |
50 | * (conn_connect): Change sizes to be @size_t@. |
51 | * |
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52 | * Revision 1.4 1999/07/26 23:21:02 mdw |
53 | * Bug fix: remove the selector before doing the callback, in case client |
54 | * adds a writer for the connected socket. |
55 | * |
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56 | * Revision 1.3 1999/05/23 12:12:37 mdw |
57 | * Interface change to make the `conn' selector useful for generic stream |
58 | * sockets rather than just IPv4 ones. |
59 | * |
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60 | * Revision 1.2 1999/05/15 10:33:32 mdw |
61 | * Fix copyright notices. |
62 | * |
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63 | * Revision 1.1 1999/05/14 21:01:14 mdw |
64 | * Integrated `select' handling bits from the background resolver project. |
65 | * |
66 | */ |
67 | |
68 | /*----- Header files ------------------------------------------------------*/ |
69 | |
70 | #include <errno.h> |
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71 | #include <limits.h> |
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72 | #include <stdio.h> |
73 | #include <stdlib.h> |
74 | #include <string.h> |
75 | |
76 | #include <sys/types.h> |
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77 | #include <sys/socket.h> |
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78 | |
79 | #include <unistd.h> |
80 | #include <fcntl.h> |
81 | |
82 | #include "conn.h" |
83 | #include "sel.h" |
84 | |
85 | /*----- Main code ---------------------------------------------------------*/ |
86 | |
87 | /* --- @conn_connect@ --- * |
88 | * |
89 | * Arguments: @int fd@ = file descriptor to try to connect |
90 | * @unsigned mode@ = what we can do to the file |
91 | * @void *p@ = pointer to connection context |
92 | * |
93 | * Returns: --- |
94 | * |
95 | * Use: Handles select results for pending connections. |
96 | */ |
97 | |
98 | static void conn_connect(int fd, unsigned mode, void *p) |
99 | { |
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100 | #ifndef PATH_MAX |
101 | # define PATH_MAX 1024 |
102 | #endif |
103 | |
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104 | conn *c = p; |
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105 | char buf[PATH_MAX + 8]; /* Big enough */ |
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106 | size_t sinsz; |
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107 | |
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108 | sinsz = sizeof(buf); |
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109 | sel_rmfile(&c->writer); |
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110 | if (getpeername(fd, (struct sockaddr *)buf, &sinsz) < 0) { |
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111 | int err; |
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112 | size_t errsz = sizeof(err); |
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113 | if (getsockopt(fd, SOL_SOCKET, SO_ERROR, &err, &errsz) == 0) |
114 | errno = err; |
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115 | close(fd); |
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116 | c->func(-1, c->p); |
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117 | } else |
118 | c->func(fd, c->p); |
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119 | } |
120 | |
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121 | /* --- @conn_fd@ --- * |
122 | * |
123 | * Arguments: @conn *c@ = pointer to connection block |
124 | * @sel_state *s@ = pointer to select state to attach to |
125 | * @int fd@ = file descriptor of socket |
126 | * @void (*func)(int fd, void *p) = handler function |
127 | * @void *p@ = argument for the handler function |
128 | * |
129 | * Returns: --- |
130 | * |
131 | * Use: Sets up a nonblocking connect job. The socket should have a |
132 | * connect pending for it already. |
133 | */ |
134 | |
135 | void conn_fd(conn *c, sel_state *s, int fd, |
136 | void (*func)(int /*fd*/, void */*p*/), |
137 | void *p) |
138 | { |
139 | c->func = func; |
140 | c->p = p; |
141 | sel_initfile(s, &c->writer, fd, SEL_WRITE, conn_connect, c); |
142 | sel_addfile(&c->writer); |
143 | } |
144 | |
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145 | /* --- @conn_init@ --- * |
146 | * |
147 | * Arguments: @conn *c@ = pointer to connection block |
148 | * @sel_state *s@ = pointer to select state to attach to |
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149 | * @int fd@ = file descriptor of socket to connect |
150 | * @struct sockaddr *dst@ = destination address |
151 | * @int dsz@ = size of destination address |
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152 | * @void (*func)(int fd, void *p) = handler function |
153 | * @void *p@ = argument for the handler function |
154 | * |
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155 | * Returns: Zero on success, nonzero on failure. |
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156 | * |
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157 | * Use: Sets up a nonblocking connect job. The socket should already |
158 | * be bound if you care about that sort of thing. When the |
159 | * connection completes, the handler function is called with the |
160 | * connected socket as an argument. If the connect fails rather |
161 | * than completes, the socket is closed, and the handler is |
162 | * informed of this by being passed a negative file descriptor. |
163 | * In either case, the select job is then removed. |
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164 | */ |
165 | |
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166 | int conn_init(conn *c, sel_state *s, int fd, |
167 | struct sockaddr *dst, int dsz, |
168 | void (*func)(int /*fd*/, void */*p*/), |
169 | void *p) |
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170 | { |
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171 | int f; |
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172 | |
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173 | if ((f = fcntl(fd, F_GETFL)) < 0 || fcntl(fd, F_SETFL, f | O_NONBLOCK)) |
174 | goto fail; |
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175 | |
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176 | if (!connect(fd, dst, dsz)) |
177 | func(fd, p); |
178 | else if (errno != EINPROGRESS) |
179 | goto fail; |
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180 | else |
181 | conn_fd(c, s, fd, func, p); |
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182 | return (0); |
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183 | |
184 | fail: |
185 | close(fd); |
186 | return (-1); |
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187 | } |
188 | |
189 | /* --- @conn_kill@ --- * |
190 | * |
191 | * Arguments: @conn *c@ = pointer to connection to dispose of |
192 | * |
193 | * Returns: --- |
194 | * |
195 | * Use: Disposes of a connection when it's not wanted any more. |
196 | */ |
197 | |
198 | void conn_kill(conn *c) |
199 | { |
200 | if (c->writer.fd != -1) { |
201 | close(c->writer.fd); |
202 | sel_rmfile(&c->writer); |
203 | c->writer.fd = -1; |
204 | } |
205 | } |
206 | |
207 | /*----- That's all, folks -------------------------------------------------*/ |