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/*++
/* NAME
/* known_tcp_ports 3
/* SUMMARY
/* reduce dependency on the services(5) database
/* SYNOPSIS
/* #include <known_tcp_ports.h>
/*
/* const char *add_known_tcp_port(
/* const char *name)
/* const char *port)
/*
/* const char *filter_known_tcp_port(
/* const char *name_or_port)
/*
/* void clear_known_tcp_ports(void)
/* AUXILIARY FUNCTIONS
/* char *export_known_tcp_ports(
/* VSTRING *result)
/* DESCRIPTION
/* This module reduces dependency on the services(5) database.
/*
/* add_known_tcp_port() associates a symbolic name with a numerical
/* port. The function returns a pointer to error text if the
/* arguments are malformed or if the symbolic name already has
/* an association.
/*
/* filter_known_tcp_port() returns the argument if it does not
/* specify a symbolic name, or if the argument specifies a symbolic
/* name that is not associated with a numerical port. Otherwise,
/* it returns the associated numerical port.
/*
/* clear_known_tcp_ports() destroys all name-number associations.
/* string.
/*
/* export_known_tcp_ports() overwrites a VSTRING with all known
/* name=port associations, sorted by service name, and separated
/* by whitespace. The result is pointer to the VSTRING payload.
/* 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 <stdlib.h>
#include <string.h>
/*
* Utility library
*/
#include <htable.h>
#include <mymalloc.h>
#include <stringops.h>
/*
* Application-specific.
*/
#include <known_tcp_ports.h>
#define STR(x) vstring_str(x)
static HTABLE *known_tcp_ports;
/* add_known_tcp_port - associate symbolic name with numerical port */
const char *add_known_tcp_port(const char *name, const char *port)
{
if (alldig(name))
return ("numerical service name");
if (!alldig(port))
return ("non-numerical service port");
if (known_tcp_ports == 0)
known_tcp_ports = htable_create(10);
if (htable_locate(known_tcp_ports, name) != 0)
return ("duplicate service name");
(void) htable_enter(known_tcp_ports, name, mystrdup(port));
return (0);
}
/* filter_known_tcp_port - replace argument if associated with known port */
const char *filter_known_tcp_port(const char *name_or_port)
{
HTABLE_INFO *ht;
if (name_or_port == 0 || known_tcp_ports == 0 || alldig(name_or_port)) {
return (name_or_port);
} else if ((ht = htable_locate(known_tcp_ports, name_or_port)) != 0) {
return (ht->value);
} else {
return (name_or_port);
}
}
/* clear_known_tcp_ports - destroy all name-port associations */
void clear_known_tcp_ports(void)
{
htable_free(known_tcp_ports, myfree);
known_tcp_ports = 0;
}
/* compare_ht_keys - compare table keys */
static int compare_ht_keys(const void *a, const void *b)
{
HTABLE_INFO **ap = (HTABLE_INFO **) a;
HTABLE_INFO **bp = (HTABLE_INFO **) b;
return (strcmp((const char *) ap[0]->key, (const char *) bp[0]->key));
}
/* export_known_tcp_ports - sorted dump */
char *export_known_tcp_ports(VSTRING *out)
{
HTABLE_INFO **list;
HTABLE_INFO **ht;
VSTRING_RESET(out);
if (known_tcp_ports) {
list = htable_list(known_tcp_ports);
qsort((void *) list, known_tcp_ports->used, sizeof(*list),
compare_ht_keys);
for (ht = list; *ht; ht++)
vstring_sprintf_append(out, "%s%s=%s", ht > list ? " " : "",
ht[0]->key, (const char *) ht[0]->value);
myfree((void *) list);
}
VSTRING_TERMINATE(out);
return (STR(out));
}
#ifdef TEST
#include <msg.h>
struct association {
const char *lhs; /* service name */
const char *rhs; /* service port */
};
struct probe {
const char *query; /* query */
const char *exp_reply; /* expected reply */
};
struct test_case {
const char *label; /* identifies test case */
struct association associations[10];
const char *exp_err; /* expected error */
const char *exp_export; /* expected export output */
struct probe probes[10];
};
struct test_case test_cases[] = {
{"good",
/* association */ {{"smtp", "25"}, {"lmtp", "24"}, 0},
/* error */ 0,
/* export */ "lmtp=24 smtp=25",
/* probe */ {{"smtp", "25"}, {"1", "1"}, {"x", "x"}, {"lmtp", "24"}, 0}
},
{"duplicate lhs",
/* association */ {{"smtp", "25"}, {"smtp", "100"}, 0},
/* error */ "duplicate service name"
},
{"numerical lhs",
/* association */ {{"100", "100"}, 0},
/* error */ "numerical service name"
},
{"symbolic rhs",
/* association */ {{"smtp", "lmtp"}, 0},
/* error */ "non-numerical service port"
},
{"uninitialized",
/* association */ {0},
/* error */ 0,
/* export */ "",
/* probe */ {{"smtp", "smtp"}, {"1", "1"}, {"x", "x"}, 0}
},
0,
};
int main(int argc, char **argv)
{
VSTRING *export_buf;
struct test_case *tp;
struct association *ap;
struct probe *pp;
int pass = 0;
int fail = 0;
const char *err;
int test_failed;
const char *reply;
const char *export;
#define STRING_OR_NULL(s) ((s) ? (s) : "(null)")
export_buf = vstring_alloc(100);
for (tp = test_cases; tp->label != 0; tp++) {
test_failed = 0;
for (err = 0, ap = tp->associations; err == 0 && ap->lhs != 0; ap++)
err = add_known_tcp_port(ap->lhs, ap->rhs);
if (!err != !tp->exp_err) {
msg_warn("test case %s: got error: \"%s\", want: \"%s\"",
tp->label, STRING_OR_NULL(err), STRING_OR_NULL(tp->exp_err));
test_failed = 1;
} else if (err != 0) {
if (strcmp(err, tp->exp_err) != 0) {
msg_warn("test case %s: got err: \"%s\", want: \"%s\"",
tp->label, err, tp->exp_err);
test_failed = 1;
}
} else {
export = export_known_tcp_ports(export_buf);
if (strcmp(export, tp->exp_export) != 0) {
msg_warn("test case %s: got export: \"%s\", want: \"%s\"",
tp->label, export, tp->exp_export);
test_failed = 1;
}
for (pp = tp->probes; test_failed == 0 && pp->query != 0; pp++) {
reply = filter_known_tcp_port(pp->query);
if (strcmp(reply, pp->exp_reply) != 0) {
msg_warn("test case %s: got reply: \"%s\", want: \"%s\"",
tp->label, reply, pp->exp_reply);
test_failed = 1;
}
}
}
clear_known_tcp_ports();
if (test_failed) {
msg_info("%s: FAIL", tp->label);
fail++;
} else {
msg_info("%s: PASS", tp->label);
pass++;
}
}
msg_info("PASS=%d FAIL=%d", pass, fail);
vstring_free(export_buf);
exit(fail != 0);
}
#endif
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