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-rw-r--r--src/global/normalize_mailhost_addr.c259
1 files changed, 259 insertions, 0 deletions
diff --git a/src/global/normalize_mailhost_addr.c b/src/global/normalize_mailhost_addr.c
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+++ b/src/global/normalize_mailhost_addr.c
@@ -0,0 +1,259 @@
+/*++
+/* NAME
+/* normalize_mailhost_addr 3
+/* SUMMARY
+/* normalize mailhost address string representation
+/* SYNOPSIS
+/* #include <normalize_mailhost_addr.h>
+/*
+/* int normalize_mailhost_addr(
+/* const char *string,
+/* char **mailhost_addr,
+/* char **bare_addr,
+/* int *addr_family)
+/* DESCRIPTION
+/* normalize_mailhost_addr() takes the RFC 2821 string
+/* representation of an IPv4 or IPv6 network address, and
+/* normalizes the "IPv6:" prefix and numeric form. An IPv6 or
+/* IPv4 form is rejected if supposed for that protocol is
+/* disabled or non-existent. If both IPv6 and IPv4 support are
+/* enabled, a V4-in-V6 address is replaced with the IPv4 form.
+/*
+/* Arguments:
+/* .IP string
+/* Null-terminated string with the RFC 2821 string representation
+/* of an IPv4 or IPv6 network address.
+/* .IP mailhost_addr
+/* Null pointer, or pointer to null-terminated string with the
+/* normalized RFC 2821 string representation of an IPv4 or
+/* IPv6 network address. Storage must be freed with myfree().
+/* .IP bare_addr
+/* Null pointer, or pointer to null-terminated string with the
+/* numeric address without prefix, such as "IPv6:". Storage
+/* must be freed with myfree().
+/* .IP addr_family
+/* Null pointer, or pointer to integer for storing the address
+/* family.
+/* DIAGNOSTICS
+/* normalize_mailhost_addr() returns -1 if the input is malformed,
+/* zero otherwise.
+/* LICENSE
+/* .ad
+/* .fi
+/* The Secure Mailer license must be distributed with this software.
+/* AUTHOR(S)
+/* Wietse Venema
+/* Google, Inc.
+/* 111 8th Avenue
+/* New York, NY 10011, USA
+/*--*/
+
+ /*
+ * System library.
+ */
+#include <sys_defs.h>
+#include <string.h>
+
+#ifdef STRCASECMP_IN_STRINGS_H
+#include <strings.h>
+#endif
+
+ /*
+ * Utility library.
+ */
+#include <inet_proto.h>
+#include <msg.h>
+#include <myaddrinfo.h>
+#include <mymalloc.h>
+#include <stringops.h>
+
+ /*
+ * Global library.
+ */
+#include <normalize_mailhost_addr.h>
+#include <valid_mailhost_addr.h>
+
+/* normalize_mailhost_addr - parse and normalize mailhost IP address */
+
+int normalize_mailhost_addr(const char *string, char **mailhost_addr,
+ char **bare_addr, int *addr_family)
+{
+ const char myname[] = "normalize_mailhost_addr";
+ const INET_PROTO_INFO *proto_info = inet_proto_info();
+ struct addrinfo *res = 0;
+ MAI_HOSTADDR_STR hostaddr;
+ const char *valid_addr; /* IPv6:fc00::1 */
+ const char *normal_addr; /* 192.168.0.1 */
+ int normal_family;
+
+#define UPDATE_BARE_ADDR(s, v) do { \
+ if (s) myfree(s); \
+ (s) = mystrdup(v); \
+ } while(0)
+#define UPDATE_MAILHOST_ADDR(s, prefix, addr) do { \
+ if (s) myfree(s); \
+ (s) = concatenate((prefix), (addr), (char *) 0); \
+ } while (0)
+
+ /*
+ * Parse and normalize the input.
+ */
+ if ((valid_addr = valid_mailhost_addr(string, DONT_GRIPE)) == 0
+ || hostaddr_to_sockaddr(valid_addr, (char *) 0, 0, &res) != 0
+ || sockaddr_to_hostaddr(res->ai_addr, res->ai_addrlen,
+ &hostaddr, (MAI_SERVPORT_STR *) 0, 0) != 0) {
+ normal_addr = 0;
+#ifdef HAS_IPV6
+ } else if (res->ai_family == AF_INET6
+ && strncasecmp("::ffff:", hostaddr.buf, 7) == 0
+ && strchr((char *) proto_info->sa_family_list, AF_INET)) {
+ normal_addr = hostaddr.buf + 7;
+ normal_family = AF_INET;
+#endif
+ } else if (strchr((char *) proto_info->sa_family_list, res->ai_family)) {
+ normal_addr = hostaddr.buf;
+ normal_family = res->ai_family;
+ } else {
+ normal_addr = 0;
+ }
+ if (res)
+ freeaddrinfo(res);
+ if (normal_addr == 0)
+ return (-1);
+
+ /*
+ * Write the applicable outputs.
+ */
+ if (bare_addr) {
+ UPDATE_BARE_ADDR(*bare_addr, normal_addr);
+ if (msg_verbose)
+ msg_info("%s: bare_addr=%s", myname, *bare_addr);
+ }
+ if (mailhost_addr) {
+#ifdef HAS_IPV6
+ if (normal_family == AF_INET6)
+ UPDATE_MAILHOST_ADDR(*mailhost_addr, IPV6_COL, normal_addr);
+ else
+#endif
+ UPDATE_BARE_ADDR(*mailhost_addr, normal_addr);
+ if (msg_verbose)
+ msg_info("%s: mailhost_addr=%s", myname, *mailhost_addr);
+ }
+ if (addr_family) {
+ *addr_family = normal_family;
+ if (msg_verbose)
+ msg_info("%s: addr_family=%s", myname,
+ *addr_family == AF_INET6 ? "AF_INET6"
+ : *addr_family == AF_INET ? "AF_INET"
+ : "unknown");
+ }
+ return (0);
+}
+
+ /*
+ * Test program.
+ */
+#ifdef TEST
+#include <stdlib.h>
+#include <mymalloc.h>
+#include <msg.h>
+
+ /*
+ * Main test program.
+ */
+int main(int argc, char **argv)
+{
+ /* Test cases with inputs and expected outputs. */
+ typedef struct TEST_CASE {
+ const char *inet_protocols;
+ const char *mailhost_addr;
+ int exp_return;
+ const char *exp_mailhost_addr;
+ char *exp_bare_addr;
+ int exp_addr_family;
+ } TEST_CASE;
+ static TEST_CASE test_cases[] = {
+ /* IPv4 in IPv6. */
+ {"ipv4, ipv6", "ipv6:::ffff:1.2.3.4", 0, "1.2.3.4", "1.2.3.4", AF_INET},
+ {"ipv6", "ipv6:::ffff:1.2.3.4", 0, "IPv6:::ffff:1.2.3.4", "::ffff:1.2.3.4", AF_INET6},
+ /* Pass IPv4 or IPV6. */
+ {"ipv4, ipv6", "ipv6:fc00::1", 0, "IPv6:fc00::1", "fc00::1", AF_INET6},
+ {"ipv4, ipv6", "1.2.3.4", 0, "1.2.3.4", "1.2.3.4", AF_INET},
+ /* Normalize IPv4 or IPV6. */
+ {"ipv4, ipv6", "ipv6:fc00::0", 0, "IPv6:fc00::", "fc00::", AF_INET6},
+ {"ipv4, ipv6", "01.02.03.04", 0, "1.2.3.4", "1.2.3.4", AF_INET},
+ /* Suppress specific outputs. */
+ {"ipv4, ipv6", "ipv6:fc00::1", 0, 0, "fc00::1", AF_INET6},
+ {"ipv4, ipv6", "ipv6:fc00::1", 0, "IPv6:fc00::1", 0, AF_INET6},
+ {"ipv4, ipv6", "ipv6:fc00::1", 0, "IPv6:fc00::1", "fc00::1", -1},
+ /* Address type mismatch. */
+ {"ipv4, ipv6", "::ffff:1.2.3.4", -1},
+ {"ipv4", "ipv6:fc00::1", -1},
+ {"ipv6", "1.2.3.4", -1},
+ 0,
+ };
+ TEST_CASE *test_case;
+
+ /* Actual results. */
+ int act_return;
+ char *act_mailhost_addr = mystrdup("initial_mailhost_addr");
+ char *act_bare_addr = mystrdup("initial_bare_addr");
+ int act_addr_family = 0xdeadbeef;
+
+ /* Findings. */
+ int tests_failed = 0;
+ int test_failed;
+
+ for (tests_failed = 0, test_case = test_cases; test_case->inet_protocols;
+ tests_failed += test_failed, test_case++) {
+ test_failed = 0;
+ inet_proto_init(argv[0], test_case->inet_protocols);
+ act_return =
+ normalize_mailhost_addr(test_case->mailhost_addr,
+ test_case->exp_mailhost_addr ?
+ &act_mailhost_addr : (char **) 0,
+ test_case->exp_bare_addr ?
+ &act_bare_addr : (char **) 0,
+ test_case->exp_addr_family >= 0 ?
+ &act_addr_family : (int *) 0);
+ if (act_return != test_case->exp_return) {
+ msg_warn("test case %d return expected=%d actual=%d",
+ (int) (test_case - test_cases),
+ test_case->exp_return, act_return);
+ test_failed = 1;
+ continue;
+ }
+ if (test_case->exp_return != 0)
+ continue;
+ if (test_case->exp_mailhost_addr
+ && strcmp(test_case->exp_mailhost_addr, act_mailhost_addr)) {
+ msg_warn("test case %d mailhost_addr expected=%s actual=%s",
+ (int) (test_case - test_cases),
+ test_case->exp_mailhost_addr, act_mailhost_addr);
+ test_failed = 1;
+ }
+ if (test_case->exp_bare_addr
+ && strcmp(test_case->exp_bare_addr, act_bare_addr)) {
+ msg_warn("test case %d bare_addr expected=%s actual=%s",
+ (int) (test_case - test_cases),
+ test_case->exp_bare_addr, act_bare_addr);
+ test_failed = 1;
+ }
+ if (test_case->exp_addr_family >= 0
+ && test_case->exp_addr_family != act_addr_family) {
+ msg_warn("test case %d addr_family expected=0x%x actual=0x%x",
+ (int) (test_case - test_cases),
+ test_case->exp_addr_family, act_addr_family);
+ test_failed = 1;
+ }
+ }
+ if (act_mailhost_addr)
+ myfree(act_mailhost_addr);
+ if (act_bare_addr)
+ myfree(act_bare_addr);
+ if (tests_failed)
+ msg_info("tests failed: %d", tests_failed);
+ exit(tests_failed != 0);
+}
+
+#endif
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