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72 lines
2.3 KiB
72 lines
2.3 KiB
--- a/hosts_access.5
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+++ b/hosts_access.5
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@@ -90,6 +90,9 @@ bitwise AND of the address and the `mask
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pattern `131.155.72.0/255.255.254.0' matches every address in the
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range `131.155.72.0' through `131.155.73.255'.
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.IP \(bu
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+An expression of the form `n.n.n.n/m\' is interpreted as a
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+`net/prefixlen\' pair, as below, for IPv4 addresses.
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+.IP \(bu
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A string that begins with a `/' character is treated as a file
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name. A host name or address is matched if it matches any host name
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or address pattern listed in the named file. The file format is
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--- a/tcpd.h
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+++ b/tcpd.h
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@@ -93,6 +93,7 @@ extern void refuse __P((struct request_i
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extern char *xgets __P((char *, int, FILE *)); /* fgets() on steroids */
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extern char *split_at __P((char *, int)); /* strchr() and split */
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extern unsigned long dot_quad_addr __P((char *)); /* restricted inet_addr() */
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+extern unsigned long prefix_to_netmask __P((char *)); /* 0-32 prefix length */
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/* Global variables. */
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--- a/misc.c
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+++ b/misc.c
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@@ -14,6 +14,8 @@ static char sccsic[] = "@(#) misc.c 1.2
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#include <arpa/inet.h>
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#include <stdio.h>
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#include <string.h>
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+#include <ctype.h>
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+#include <stdlib.h>
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#include "tcpd.h"
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@@ -85,3 +87,22 @@ char *str;
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}
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return (runs == 4 ? inet_addr(str) : INADDR_NONE);
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}
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+
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+/* prefix_to_netmask - convert prefix (0-32) to netmask */
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+
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+unsigned long prefix_to_netmask(str)
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+char *str;
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+{
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+ unsigned long prefix;
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+ char *endptr;
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+
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+ if (!isdigit(str[0]))
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+ return INADDR_NONE;
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+
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+ prefix = strtoul(str, &endptr, 10);
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+ if ((endptr == str) || (*endptr != '\0') || (prefix > 32))
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+ return INADDR_NONE;
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+
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+ return htonl(~0UL << (32 - prefix));
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+}
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+
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--- a/hosts_access.c
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+++ b/hosts_access.c
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@@ -345,7 +345,12 @@ char *string;
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if ((addr = dot_quad_addr(string)) == INADDR_NONE)
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return (NO);
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if ((net = dot_quad_addr(net_tok)) == INADDR_NONE
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- || (mask = dot_quad_addr(mask_tok)) == INADDR_NONE) {
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+ || ((mask = dot_quad_addr(mask_tok)) == INADDR_NONE
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+ && strcmp(mask_tok, "255.255.255.255")
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+ && (mask = prefix_to_netmask(mask_tok)) == INADDR_NONE
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+ && strcmp(mask_tok, "32"))) {
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+ /* 255.255.255.255 == INADDR_NONE, separate check needed. TJ. */
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+ /* 32 == INADDR_NONE, separate check needed. philipp */
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tcpd_warn("bad net/mask expression: %s/%s", net_tok, mask_tok);
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return (NO); /* not tcpd_jump() */
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}
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