diff options
| author | itojun <itojun@NetBSD.org> | 2001-03-13 17:45:02 +0000 |
|---|---|---|
| committer | itojun <itojun@NetBSD.org> | 2001-03-13 17:45:02 +0000 |
| commit | 173b2f6655e38657f15bb57fe26dc23e8d054d4e (patch) | |
| tree | 04af30df8438e7c54ceb4e5f4bf0dff83788ce54 /gnu/dist/postfix/src/util/valid_hostname.c | |
| parent | c7871f80bf97592f2ca4dd16d6d7708bec2c33a2 (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.c | 223 |
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 |
