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/* $OpenBSD: table_api.c,v 1.7 2015/01/20 17:37:54 deraadt Exp $ */
/*
* Copyright (c) 2013 Eric Faurot <eric@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <sys/queue.h>
#include <sys/tree.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <event.h>
#include <fcntl.h>
#include <imsg.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <limits.h>
#include "smtpd-defines.h"
#include "smtpd-api.h"
#include "log.h"
static int (*handler_update)(void);
static int (*handler_check)(int, struct dict *, const char *);
static int (*handler_lookup)(int, struct dict *, const char *, char *, size_t);
static int (*handler_fetch)(int, struct dict *, char *, size_t);
static int quit;
static struct imsgbuf ibuf;
static struct imsg imsg;
static size_t rlen;
static char *rdata;
static struct ibuf *buf;
static char *name;
#if 0
static char *rootpath;
static char *user = SMTPD_USER;
#endif
static void
table_msg_get(void *dst, size_t len)
{
if (len > rlen) {
log_warnx("warn: table-proc: bad msg len");
fatalx("table-proc: exiting");
}
if (len == 0)
return;
if (dst)
memmove(dst, rdata, len);
rlen -= len;
rdata += len;
}
static void
table_msg_end(void)
{
if (rlen) {
log_warnx("warn: table-proc: bogus data");
fatalx("table-proc: exiting");
}
imsg_free(&imsg);
}
static void
table_msg_add(const void *data, size_t len)
{
if (buf == NULL)
buf = imsg_create(&ibuf, PROC_TABLE_OK, 0, 0, 1024);
if (buf == NULL) {
log_warnx("warn: table-api: imsg_create failed");
fatalx("table-api: exiting");
}
if (imsg_add(buf, data, len) == -1) {
log_warnx("warn: table-api: imsg_add failed");
fatalx("table-api: exiting");
}
}
static void
table_msg_close(void)
{
imsg_close(&ibuf, buf);
buf = NULL;
}
static int
table_read_params(struct dict *params)
{
size_t count;
char *key;
char *value;
dict_init(params);
table_msg_get(&count, sizeof(count));
for (;count; count--) {
key = rdata;
table_msg_get(NULL, strlen(key) + 1);
value = rdata;
table_msg_get(NULL, strlen(value) + 1);
dict_set(params, key, value);
}
return (0);
}
static void
table_clear_params(struct dict *params)
{
while (dict_poproot(params, NULL))
;
}
static void
table_msg_dispatch(void)
{
struct table_open_params op;
struct dict params;
char res[4096];
int type, r;
memset(res, 0, sizeof res);
switch (imsg.hdr.type) {
case PROC_TABLE_OPEN:
table_msg_get(&op, sizeof op);
table_msg_end();
if (op.version != PROC_TABLE_API_VERSION) {
log_warnx("warn: table-api: bad API version");
fatalx("table-api: terminating");
}
if ((name = strdup(op.name)) == NULL) {
log_warn("warn: table-api");
fatalx("table-api: terminating");
}
imsg_compose(&ibuf, PROC_TABLE_OK, 0, 0, -1, NULL, 0);
break;
case PROC_TABLE_UPDATE:
table_msg_end();
if (handler_update)
r = handler_update();
else
r = 1;
imsg_compose(&ibuf, PROC_TABLE_OK, 0, 0, -1, &r, sizeof(r));
break;
case PROC_TABLE_CLOSE:
quit = 1;
break;
case PROC_TABLE_CHECK:
table_msg_get(&type, sizeof(type));
table_read_params(¶ms);
if (rlen == 0) {
log_warnx("warn: table-api: no key");
fatalx("table-api: exiting");
}
if (rdata[rlen - 1] != '\0') {
log_warnx("warn: table-api: key not NUL-terminated");
fatalx("table-api: exiting");
}
if (handler_check)
r = handler_check(type, ¶ms, rdata);
else
r = -1;
table_clear_params(¶ms);
table_msg_get(NULL, rlen);
table_msg_end();
table_msg_add(&r, sizeof(r));
table_msg_close();
break;
case PROC_TABLE_LOOKUP:
table_msg_get(&type, sizeof(type));
table_read_params(¶ms);
if (rlen == 0) {
log_warnx("warn: table-api: no key");
fatalx("table-api: exiting");
}
if (rdata[rlen - 1] != '\0') {
log_warnx("warn: table-api: key not NUL-terminated");
fatalx("table-api: exiting");
}
if (handler_lookup)
r = handler_lookup(type, ¶ms, rdata, res, sizeof(res));
else
r = -1;
table_clear_params(¶ms);
table_msg_get(NULL, rlen);
table_msg_end();
table_msg_add(&r, sizeof(r));
if (r == 1)
table_msg_add(res, strlen(res) + 1);
table_msg_close();
break;
case PROC_TABLE_FETCH:
table_msg_get(&type, sizeof(type));
table_read_params(¶ms);
if (handler_fetch)
r = handler_fetch(type, ¶ms, res, sizeof(res));
else
r = -1;
table_clear_params(¶ms);
table_msg_end();
table_msg_add(&r, sizeof(r));
if (r == 1)
table_msg_add(res, strlen(res) + 1);
table_msg_close();
break;
default:
log_warnx("warn: table-api: bad message %d", imsg.hdr.type);
fatalx("table-api: exiting");
}
}
void
table_api_on_update(int(*cb)(void))
{
handler_update = cb;
}
void
table_api_on_check(int(*cb)(int, struct dict *, const char *))
{
handler_check = cb;
}
void
table_api_on_lookup(int(*cb)(int, struct dict *, const char *, char *, size_t))
{
handler_lookup = cb;
}
void
table_api_on_fetch(int(*cb)(int, struct dict *, char *, size_t))
{
handler_fetch = cb;
}
const char *
table_api_get_name(void)
{
return name;
}
int
table_api_dispatch(void)
{
#if 0
struct passwd *pw;
#endif
ssize_t n;
#if 0
pw = getpwnam(user);
if (pw == NULL) {
log_warn("table-api: getpwnam");
fatalx("table-api: exiting");
}
if (rootpath) {
if (chroot(rootpath) == -1) {
log_warn("table-api: chroot");
fatalx("table-api: exiting");
}
if (chdir("/") == -1) {
log_warn("table-api: chdir");
fatalx("table-api: exiting");
}
}
if (setgroups(1, &pw->pw_gid) ||
setresgid(pw->pw_gid, pw->pw_gid, pw->pw_gid) ||
setresuid(pw->pw_uid, pw->pw_uid, pw->pw_uid)) {
log_warn("table-api: cannot drop privileges");
fatalx("table-api: exiting");
}
#endif
imsg_init(&ibuf, 0);
while (1) {
n = imsg_get(&ibuf, &imsg);
if (n == -1) {
log_warn("warn: table-api: imsg_get");
break;
}
if (n) {
rdata = imsg.data;
rlen = imsg.hdr.len - IMSG_HEADER_SIZE;
table_msg_dispatch();
if (quit)
break;
imsg_flush(&ibuf);
continue;
}
n = imsg_read(&ibuf);
if (n == -1) {
log_warn("warn: table-api: imsg_read");
break;
}
if (n == 0) {
log_warnx("warn: table-api: pipe closed");
break;
}
}
return (1);
}
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