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authoritojun <itojun@NetBSD.org>2001-03-13 17:45:02 +0000
committeritojun <itojun@NetBSD.org>2001-03-13 17:45:02 +0000
commit173b2f6655e38657f15bb57fe26dc23e8d054d4e (patch)
tree04af30df8438e7c54ceb4e5f4bf0dff83788ce54 /gnu/dist/postfix/src/util/valid_hostname.c
parentc7871f80bf97592f2ca4dd16d6d7708bec2c33a2 (diff)
postfix release-20010228
Diffstat (limited to 'gnu/dist/postfix/src/util/valid_hostname.c')
-rw-r--r--gnu/dist/postfix/src/util/valid_hostname.c223
1 files changed, 223 insertions, 0 deletions
diff --git a/gnu/dist/postfix/src/util/valid_hostname.c b/gnu/dist/postfix/src/util/valid_hostname.c
new file mode 100644
index 00000000000..fa628c4881c
--- /dev/null
+++ b/gnu/dist/postfix/src/util/valid_hostname.c
@@ -0,0 +1,223 @@
+/*++
+/* NAME
+/* valid_hostname 3
+/* SUMMARY
+/* network name validation
+/* SYNOPSIS
+/* #include <valid_hostname.h>
+/*
+/* int valid_hostname(name, gripe)
+/* const char *name;
+/* int gripe;
+/*
+/* int valid_hostaddr(addr, gripe)
+/* const char *addr;
+/* int gripe;
+/* DESCRIPTION
+/* valid_hostname() scrutinizes a hostname: the name should be no
+/* longer than VALID_HOSTNAME_LEN characters, should contain only
+/* letters, digits, dots and hyphens, no adjacent dots and hyphens,
+/* no leading or trailing dots or hyphens, no labels longer than
+/* VALID_LABEL_LEN characters, and no numeric top-level domain.
+/*
+/* valid_hostaddr() requirs that the input is a valid string
+/* representation of an internet network address.
+/*
+/* These routines operate silently unless the gripe parameter
+/* specifies a non-zero value. The macros DO_GRIPE and DONT_GRIPE
+/* provide suitable constants.
+/* DIAGNOSTICS
+/* Both functions return zero if they disagree with the input.
+/* SEE ALSO
+/* RFC 952, 1123, RFC 1035
+/* LICENSE
+/* .ad
+/* .fi
+/* The Secure Mailer license must be distributed with this software.
+/* AUTHOR(S)
+/* Wietse Venema
+/* IBM T.J. Watson Research
+/* P.O. Box 704
+/* Yorktown Heights, NY 10598, USA
+/*--*/
+
+/* System library. */
+
+#include <sys_defs.h>
+#include <string.h>
+#include <ctype.h>
+
+/* Utility library. */
+
+#include "msg.h"
+#include "mymalloc.h"
+#include "stringops.h"
+#include "valid_hostname.h"
+
+/* valid_hostname - screen out bad hostnames */
+
+int valid_hostname(const char *name, int gripe)
+{
+ char *myname = "valid_hostname";
+ const char *cp;
+ int label_length = 0;
+ int label_count = 0;
+ int non_numeric = 0;
+ int ch;
+
+ /*
+ * Trivial cases first.
+ */
+ if (*name == 0) {
+ if (gripe)
+ msg_warn("%s: empty hostname", myname);
+ return (0);
+ }
+
+ /*
+ * Find bad characters or label lengths. Find adjacent delimiters.
+ */
+ for (cp = name; (ch = *(unsigned char *) cp) != 0; cp++) {
+ if (ISALNUM(ch) || ch == '_') { /* grr.. */
+ if (label_length == 0)
+ label_count++;
+ label_length++;
+ if (label_length > VALID_LABEL_LEN) {
+ if (gripe)
+ msg_warn("%s: hostname label too long: %.100s", myname, name);
+ return (0);
+ }
+ if (!ISDIGIT(ch))
+ non_numeric = 1;
+ } else if (ch == '.') {
+ if (label_length == 0 || cp[1] == 0) {
+ if (gripe)
+ msg_warn("%s: misplaced delimiter: %.100s", myname, name);
+ return (0);
+ }
+ label_length = 0;
+ } else if (ch == '-') {
+ label_length++;
+ if (label_length == 1 || cp[1] == 0 || cp[1] == '.') {
+ if (gripe)
+ msg_warn("%s: misplaced hyphen: %.100s", myname, name);
+ return (0);
+ }
+ } else {
+ if (gripe)
+ msg_warn("%s: invalid character %d(decimal): %.100s",
+ myname, ch, name);
+ return (0);
+ }
+ }
+
+ if (non_numeric == 0) {
+ if (gripe)
+ msg_warn("%s: numeric hostname: %.100s", myname, name);
+ /* NOT: return (0); this confuses users of the DNS client */
+ }
+ if (cp - name > VALID_HOSTNAME_LEN) {
+ if (gripe)
+ msg_warn("%s: bad length %d for %.100s...",
+ myname, (int) (cp - name), name);
+ return (0);
+ }
+ return (1);
+}
+
+/* valid_hostaddr - test dotted quad string for correctness */
+
+int valid_hostaddr(const char *addr, int gripe)
+{
+ const char *cp;
+ char *myname = "valid_hostaddr";
+ int in_byte = 0;
+ int byte_count = 0;
+ int byte_val = 0;
+ int ch;
+
+#define BYTES_NEEDED 4
+
+ /*
+ * Trivial cases first.
+ */
+ if (*addr == 0) {
+ if (gripe)
+ msg_warn("%s: empty address", myname);
+ return (0);
+ }
+
+ /*
+ * Scary code to avoid sscanf() overflow nasties.
+ */
+ for (cp = addr; (ch = *(unsigned const char *) cp) != 0; cp++) {
+ if (ISDIGIT(ch)) {
+ if (in_byte == 0) {
+ in_byte = 1;
+ byte_val = 0;
+ byte_count++;
+ }
+ byte_val *= 10;
+ byte_val += ch - '0';
+ if (byte_val > 255) {
+ if (gripe)
+ msg_warn("%s: invalid octet value: %.100s", myname, addr);
+ return (0);
+ }
+ } else if (ch == '.') {
+ if (in_byte == 0 || cp[1] == 0) {
+ if (gripe)
+ msg_warn("%s: misplaced dot: %.100s", myname, addr);
+ return (0);
+ }
+ if ((byte_count == 1 && byte_val == 0)) {
+ if (gripe)
+ msg_warn("%s: bad initial octet value: %.100s", myname, addr);
+ return (0);
+ }
+ in_byte = 0;
+ } else {
+ if (gripe)
+ msg_warn("%s: invalid character %d(decimal): %.100s",
+ myname, ch, addr);
+ return (0);
+ }
+ }
+
+ if (byte_count != BYTES_NEEDED) {
+ if (gripe)
+ msg_warn("%s: invalid octet count: %.100s", myname, addr);
+ return (0);
+ }
+ return (1);
+}
+
+#ifdef TEST
+
+ /*
+ * Test program - reads hostnames from stdin, reports invalid hostnames to
+ * stderr.
+ */
+#include <stdlib.h>
+
+#include "vstring.h"
+#include "vstream.h"
+#include "vstring_vstream.h"
+#include "msg_vstream.h"
+
+int main(int unused_argc, char **argv)
+{
+ VSTRING *buffer = vstring_alloc(1);
+
+ msg_vstream_init(argv[0], VSTREAM_ERR);
+ msg_verbose = 1;
+
+ while (vstring_fgets_nonl(buffer, VSTREAM_IN)) {
+ msg_info("testing: \"%s\"", vstring_str(buffer));
+ valid_hostname(vstring_str(buffer), DO_GRIPE);
+ valid_hostaddr(vstring_str(buffer), DO_GRIPE);
+ }
+ exit(0);
+}
+
+#endif