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comparison libutil/sockinit.c @ 1:dbc0a8677b69

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libutil: import from ThemWi1
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 25 Jun 2022 18:33:29 -0800
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0:0e907d59d815 1:dbc0a8677b69
1 /*
2 * This library module implements a function that helps initialize
3 * sockaddr for bind or connect operations on UNIX domain sockets.
4 *
5 * Back when I programmed under 4.3BSD UNIX, this operation was simple
6 * and straightforward - but under "modern" Unixes, it appears to be
7 * a complex affair, given the messy code (originally copied from
8 * Osmocom) that appears in FreeCalypso host tools for the rvinterf
9 * local socket interface. Hence I am factoring that mess out into
10 * its own library function this time around.
11 */
12
13 #include <sys/types.h>
14 #include <sys/socket.h>
15 #include <sys/un.h>
16 #include <string.h>
17 #include <strings.h>
18
19 void
20 fill_sockaddr_un(pathname, sunp, lenp)
21 char *pathname;
22 struct sockaddr_un *sunp;
23 unsigned *lenp;
24 {
25 /* local socket binding voodoo copied from osmocon */
26 sunp->sun_family = AF_UNIX;
27 strncpy(sunp->sun_path, pathname, sizeof(sunp->sun_path));
28 sunp->sun_path[sizeof(sunp->sun_path) - 1] = '\0';
29 /* we use the same magic that X11 uses in Xtranssock.c for
30 * calculating the proper length of the sockaddr */
31 #if defined(BSD44SOCKETS) || defined(__UNIXWARE__)
32 sunp->sun_len = strlen(sunp->sun_path);
33 #endif
34 #if defined(BSD44SOCKETS) || defined(SUN_LEN)
35 *lenp = SUN_LEN(sunp);
36 #else
37 *lenp = strlen(sunp->sun_path) +
38 offsetof(struct sockaddr_un, sun_path) + 1;
39 #endif
40 }