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Diffstat (limited to 'src/global/valid_mailhost_addr.c')
| -rw-r--r-- | src/global/valid_mailhost_addr.c | 152 |
1 files changed, 152 insertions, 0 deletions
diff --git a/src/global/valid_mailhost_addr.c b/src/global/valid_mailhost_addr.c new file mode 100644 index 0000000..79a7900 --- /dev/null +++ b/src/global/valid_mailhost_addr.c @@ -0,0 +1,152 @@ +/*++ +/* 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 |