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/* $OpenBSD: delivery_lmtp.c,v 1.9 2015/10/14 22:01:43 gilles Exp $ */
/*
* Copyright (c) 2013 Ashish SHUKLA <ashish.is@lostca.se>
*
* 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/socket.h>
#include <sys/queue.h>
#include <sys/tree.h>
#include <sys/un.h>
#include <ctype.h>
#include <err.h>
#include <event.h>
#include <fcntl.h>
#include <imsg.h>
#include <paths.h>
#include <netdb.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <limits.h>
#include "smtpd.h"
#include "log.h"
/* mda backend */
static void delivery_lmtp_open(struct deliver *);
static int inet_socket(char *);
static int unix_socket(char *);
static char* lmtp_getline(FILE *);
struct delivery_backend delivery_backend_lmtp = {
0, delivery_lmtp_open
};
enum lmtp_state {
LMTP_BANNER,
LMTP_LHLO,
LMTP_MAIL_FROM,
LMTP_RCPT_TO,
LMTP_DATA,
LMTP_QUIT,
LMTP_BYE
};
static int
inet_socket (char *address)
{
int s, n;
char *hostname, *servname;
struct addrinfo hints;
struct addrinfo *result0, *result;
servname = strchr(address, ':');
if (servname == NULL)
errx(1, "invalid address: %s", address);
*servname++ = '\0';
hostname = address;
s = -1;
memset(&hints, 0, sizeof(hints));
hints.ai_family = PF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
hints.ai_flags = AI_NUMERICSERV;
n = getaddrinfo(hostname, servname, &hints, &result0);
if (n)
errx(1, "%s", gai_strerror(n));
for (result = result0; s < 0 && result; result = result->ai_next) {
if ((s = socket(result->ai_family, result->ai_socktype,
result->ai_protocol)) == -1) {
warn("socket");
continue;
}
if (connect(s, result->ai_addr, result->ai_addrlen) == -1) {
warn("connect");
close(s);
s = -1;
continue;
}
break;
}
freeaddrinfo(result0);
return s;
}
static int
unix_socket(char *path) {
struct sockaddr_un addr;
int s;
memset(&addr, 0, sizeof(addr));
if ((s = socket(PF_LOCAL, SOCK_STREAM, 0)) == -1) {
warn("socket");
return -1;
}
addr.sun_family = AF_UNIX;
if (strlcpy(addr.sun_path, path, sizeof(addr.sun_path))
>= sizeof(addr.sun_path)) {
warnx("socket path too long");
close(s);
return -1;
}
if (connect(s, (struct sockaddr*) &addr, sizeof(addr)) == -1) {
warn("connect");
close(s);
return -1;
}
return s;
}
static void
delivery_lmtp_open(struct deliver *deliver)
{
char *buffer;
char lhloname[255];
int s;
FILE *fp;
enum lmtp_state state = LMTP_BANNER;
size_t sz;
ssize_t len;
fp = NULL;
if (deliver->to[0] == '/')
s = unix_socket(deliver->to);
else
s = inet_socket(deliver->to);
if (s == -1 || (fp = fdopen(s, "r+")) == NULL)
err(1, "couldn't establish connection");
while (!feof(fp) && !ferror(fp) && state != LMTP_BYE) {
buffer = lmtp_getline(fp);
if (buffer == NULL)
err(1, "No input received");
switch (state) {
case LMTP_BANNER:
if (strncmp("220 ", buffer, 4) != 0)
errx(1, "Invalid LMTP greeting: %s\n", buffer);
gethostname(lhloname, sizeof lhloname );
fprintf(fp, "LHLO %s\r\n", lhloname);
state = LMTP_LHLO;
break;
case LMTP_LHLO:
if (buffer[0] != '2')
errx(1, "LHLO rejected: %s\n", buffer);
if (strlen(buffer) < 4)
errx(1, "Invalid LMTP LHLO answer: %s\n", buffer);
if (buffer[3] == '-')
continue; /* multi-line */
fprintf(fp, "MAIL FROM:<%s>\r\n", deliver->from);
state = LMTP_MAIL_FROM;
break;
case LMTP_MAIL_FROM:
if (buffer[0] != '2')
errx(1, "MAIL FROM rejected: %s\n", buffer);
fprintf(fp, "RCPT TO:<%s>\r\n", deliver->user);
state = LMTP_RCPT_TO;
break;
case LMTP_RCPT_TO:
if (buffer[0] != '2')
errx(1, "RCPT TO rejected: %s\n", buffer);
fprintf(fp, "DATA\r\n");
state = LMTP_DATA;
break;
case LMTP_DATA:
if (buffer[0] != '3')
errx(1, "DATA rejected: %s\n", buffer);
buffer = NULL;
sz = 0;
while ((len = getline(&buffer, &sz, stdin)) != -1) {
if (buffer[len - 1] == '\n')
buffer[len - 1] = '\0';
fprintf(fp, "%s%s\r\n",
*buffer == '.' ? "." : "", buffer);
}
free(buffer);
fprintf(fp, ".\r\n");
state = LMTP_QUIT;
break;
case LMTP_QUIT:
if (buffer[0] != '2')
errx(1, "Delivery error: %s\n", buffer);
fprintf(fp, "QUIT\r\n");
state = LMTP_BYE;
break;
default:
errx(1, "Bogus state %d", state);
}
}
_exit(0);
}
static char*
lmtp_getline(FILE *fp)
{
char *buffer;
size_t len;
if ((buffer = fgetln(fp, &len)) != NULL) {
if (len >= 2 && buffer[len-2] == '\r')
buffer[len-2] = '\0';
buffer[len-1] = '\0';
}
return buffer;
}
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