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