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-rw-r--r--src/global/valid_mailhost_addr.c152
1 files changed, 152 insertions, 0 deletions
diff --git a/src/global/valid_mailhost_addr.c b/src/global/valid_mailhost_addr.c
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+/*++
+/* NAME
+/* valid_mailhost_addr 3
+/* SUMMARY
+/* mailhost address syntax validation
+/* SYNOPSIS
+/* #include <valid_mailhost_addr.h>
+/*
+/* const char *valid_mailhost_addr(name, gripe)
+/* const char *name;
+/* int gripe;
+/*
+/* int valid_mailhost_literal(addr, gripe)
+/* const char *addr;
+/* int gripe;
+/* DESCRIPTION
+/* valid_mailhost_addr() requires that the input is a valid
+/* RFC 2821 string representation of an IPv4 or IPv6 network
+/* address. A valid IPv4 address is in dotted quad decimal
+/* form. A valid IPv6 address includes the "IPV6:" prefix as
+/* required by RFC 2821, and is in valid hexadecimal form or
+/* in valid IPv4-in-IPv6 form. The result value is the bare
+/* address in the input argument (i.e. text after "IPV6:"
+/* prefix, if any) in case of success, a null pointer in case
+/* of failure.
+/*
+/* valid_mailhost_literal() requires an address enclosed in
+/* []. The result is non-zero in case of success, zero in
+/* case of failure.
+/*
+/* These routines operate silently unless the gripe parameter
+/* specifies a non-zero value. The macros DO_GRIPE and DONT_GRIPE
+/* provide suitable constants.
+/*
+/* The IPV6_COL macro defines the "IPv6:" prefix.
+/* DIAGNOSTICS
+/* Warnings are logged with msg_warn().
+/* SEE ALSO
+/* valid_hostname(3)
+/* RFC 952, RFC 1123, RFC 1035, RFC 2821
+/* 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>
+
+#ifdef STRCASECMP_IN_STRINGS_H
+#include <strings.h>
+#endif
+
+/* Utility library. */
+
+#include <msg.h>
+#include <myaddrinfo.h>
+
+/* Global library. */
+
+#include <valid_mailhost_addr.h>
+
+/* Application-specific. */
+
+#define IPV6_COL_LEN (sizeof(IPV6_COL) - 1)
+#define HAS_IPV6_COL(str) (strncasecmp((str), IPV6_COL, IPV6_COL_LEN) == 0)
+#define SKIP_IPV6_COL(str) (HAS_IPV6_COL(str) ? (str) + IPV6_COL_LEN : (str))
+
+/* valid_mailhost_addr - validate RFC 2821 numerical address form */
+
+const char *valid_mailhost_addr(const char *addr, int gripe)
+{
+ const char *bare_addr;
+
+ bare_addr = SKIP_IPV6_COL(addr);
+ return ((bare_addr != addr ? valid_ipv6_hostaddr : valid_ipv4_hostaddr)
+ (bare_addr, gripe) ? bare_addr : 0);
+}
+
+/* valid_mailhost_literal - validate [RFC 2821 numerical address] form */
+
+int valid_mailhost_literal(const char *addr, int gripe)
+{
+ const char *myname = "valid_mailhost_literal";
+ MAI_HOSTADDR_STR hostaddr;
+ const char *last;
+ size_t address_bytes;
+
+ if (*addr != '[') {
+ if (gripe)
+ msg_warn("%s: '[' expected at start: %.100s", myname, addr);
+ return (0);
+ }
+ if ((last = strchr(addr, ']')) == 0) {
+ if (gripe)
+ msg_warn("%s: ']' expected at end: %.100s", myname, addr);
+ return (0);
+ }
+ if (last[1]) {
+ if (gripe)
+ msg_warn("%s: unexpected text after ']': %.100s", myname, addr);
+ return (0);
+ }
+ if ((address_bytes = last - addr - 1) >= sizeof(hostaddr.buf)) {
+ if (gripe)
+ msg_warn("%s: too much text: %.100s", myname, addr);
+ return (0);
+ }
+ strncpy(hostaddr.buf, addr + 1, address_bytes);
+ hostaddr.buf[address_bytes] = 0;
+ return (valid_mailhost_addr(hostaddr.buf, gripe) != 0);
+}
+
+#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));
+ if (vstring_str(buffer)[0] == '[')
+ valid_mailhost_literal(vstring_str(buffer), DO_GRIPE);
+ else
+ valid_mailhost_addr(vstring_str(buffer), DO_GRIPE);
+ }
+ exit(0);
+}
+
+#endif