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/*++
/* NAME
/* inet_prefix_top 3
/* SUMMARY
/* convert net/mask to printable string
/* SYNOPSIS
/* #include <inet_prefix_top.h>
/*
/* char *inet_prefix_top(
/* int family,
/* const void *src,
/* int prefix_len)
/* DESCRIPTION
/* inet_prefix_top() prints the network portion of the specified
/* IPv4 or IPv6 address, null bits for the host portion, and
/* the prefix length if it is shorter than the address.
/* The result should be passed to myfree(). The code can
/* handle addresses of any length, and bytes of any width.
/*
/* Arguments:
/* .IP af
/* The address family, as with inet_ntop().
/* .IP src
/* Pointer to storage for an IPv4 or IPv6 address, as with
/* inet_ntop().
/* .IP prefix_len
/* The number of most-significant bits in \fBsrc\fR that should
/* not be cleared.
/* DIAGNOSTICS
/* Panic: unexpected protocol family, bad prefix length. Fatal
/* errors: address conversion error.
/* LICENSE
/* .ad
/* .fi
/* The Secure Mailer license must be distributed with this software.
/* AUTHOR(S)
/* Wietse Venema
/*--*/
/*
* System library.
*/
#include <sys_defs.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <string.h>
/*
* Utility library.
*/
#include <mask_addr.h>
#include <msg.h>
#include <inet_addr_sizes.h>
#include <inet_prefix_top.h>
#include <vstring.h>
/* inet_prefix_top - printable net/mask pattern */
char *inet_prefix_top(int af, const void *src, int prefix_len)
{
const char myname[] = "inet_prefix_top";
union {
struct in_addr in_addr;
struct in6_addr in6_addr;
} u;
VSTRING *buf;
const INET_ADDR_SIZES *sp;
/*
* Sanity checks. XXX We use msg_fatal() because mail_conf_int() does not
* (yet) support non-negative integers.
*/
if ((sp = inet_addr_sizes(af)) == 0)
msg_panic("%s: unexpected address family: %d", myname, af);
if (prefix_len > sp->addr_bitcount || prefix_len < 0)
msg_fatal("%s: bad %s address prefix length: %d",
myname, sp->ipproto_str, prefix_len);
/*
* Strip a copy of the input address. When allocating the result memory,
* add 1 for the string terminator from inet_ntop(), or 1 for the '/'
* before the prefix. We should not rely on vstring(3)'s safety byte.
*/
memcpy((void *) &u, src, sp->addr_bytecount);
if (prefix_len < sp->addr_bitcount) {
mask_addr((unsigned char *) &u, sp->addr_bytecount, prefix_len);
buf = vstring_alloc(sp->addr_strlen + sp->addr_bitcount_strlen + 1);
} else {
buf = vstring_alloc(sp->addr_strlen + 1);
}
/*
* Convert the result to string, and append the optional /prefix.
*/
if (inet_ntop(af, &u, vstring_str(buf), vstring_avail(buf)) == 0)
msg_fatal("%s: inet_ntop: %m", myname);
vstring_set_payload_size(buf, strlen(vstring_str(buf)));
if (prefix_len < sp->addr_bitcount)
vstring_sprintf_append(buf, "/%d", prefix_len);
return (vstring_export(buf));
}
#ifdef TEST
#include <stdlib.h>
#include <msg_vstream.h>
#include <name_code.h>
/*
* TODO: add test cases for fatal and panic errors, intercept msg_fatal()
* and msg_panic(), and verify the expected error messages.
*/
typedef struct TEST_CASE {
int in_af;
int in_prefix_len;
const char *exp_prefix;
} TEST_CASE;
static TEST_CASE test_cases[] = {
AF_INET, 32, "255.255.255.255",
AF_INET, 28, "255.255.255.240/28",
AF_INET, 4, "240.0.0.0/4",
AF_INET, 0, "0.0.0.0/0",
AF_INET6, 128, "ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff",
AF_INET6, 124, "ffff:ffff:ffff:ffff:ffff:ffff:ffff:fff0/124",
AF_INET6, 4, "f000::/4",
AF_INET6, 0, "::/0",
};
const NAME_CODE af_map[] = {
"AF_INET", AF_INET,
"AF_INET6", AF_INET6,
0,
};
#define TEST_CASE_COUNT (sizeof(test_cases) / sizeof(test_cases[0]))
int main(int argc, char **argv)
{
TEST_CASE *tp;
union {
struct in_addr in_addr;
struct in6_addr in6_addr;
} u;
char *act_prefix;
int pass = 0;
int fail = 0;
msg_vstream_init(argv[0], VSTREAM_ERR);
memset(&u, ~0, sizeof(u));
for (tp = test_cases; tp < test_cases + TEST_CASE_COUNT; tp++) {
msg_info("RUN %s/%d", str_name_code(af_map, tp->in_af),
tp->in_prefix_len);
act_prefix = inet_prefix_top(tp->in_af, &u, tp->in_prefix_len);
if (strcmp(act_prefix, tp->exp_prefix) != 0) {
msg_warn("got \"%s\", want \"%s\"", act_prefix, tp->exp_prefix);
fail += 1;
msg_info("FAIL %s/%d", str_name_code(af_map, tp->in_af),
tp->in_prefix_len);
} else {
pass += 1;
msg_info("PASS %s/%d", str_name_code(af_map, tp->in_af),
tp->in_prefix_len);
}
}
msg_info("PASS=%d FAIL=%d", pass, fail);
return (fail > 0);
}
#endif /* TEST */
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