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/*
* Simple Mail Submission Agent using SMTP with libEtPan!
* TODO: Full sendmail like interface
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <libetpan/libetpan.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#ifdef WIN32
# include "win_etpan.h"
#ifdef _MSC_VER
# include "../src/bsd/getopt.h"
# define STDIN_FILENO _fileno(stdin)
#else
# include <getopt.h>
#endif
#else
# include <netdb.h>
# include <netinet/in.h>
# include <sys/socket.h>
# include <sys/mman.h>
# include <unistd.h>
# include <sys/ioctl.h>
# include <pwd.h>
# define _GNU_SOURCE
# include <getopt.h>
#endif
/* globals */
char *smtp_server;
uint16_t smtp_port = 25;
char *smtp_user;
char *smtp_password;
char *smtp_from;
int smtp_tls = 0;
int smtp_esmtp = 1;
struct mem_message {
char *data;
size_t len;
MMAPString *mstring;
};
#define BLOCKSIZE 4096
int collect(struct mem_message *message) {
struct stat sb;
int len;
memset(message, 0, sizeof(struct mem_message));
#ifndef MMAP_UNAVAILABLE
/* if stdin is a file whose size is known, try to mmap it */
if (!fstat(0, &sb) && S_ISREG(sb.st_mode) && sb.st_size >= 0) {
message->len = sb.st_size;
if ((message->data = mmap(NULL, message->len, PROT_READ, MAP_SHARED,
STDIN_FILENO, 0)) != MAP_FAILED)
return 0;
}
#endif
/* read the buffer from stdin by blocks, until EOF or error.
save the message in a mmap_string */
if ((message->mstring = mmap_string_sized_new(BLOCKSIZE)) == NULL) {
perror("mmap_string_new");
goto error;
}
message->len = 0;
while ((len = read(STDIN_FILENO,
message->mstring->str + message->len, BLOCKSIZE)) > 0) {
message->len += len;
/* reserve room for next block */
if ((mmap_string_set_size(message->mstring,
message->len + BLOCKSIZE)) == NULL) {
perror("mmap_string_set_size");
goto error;
}
}
if (len == 0) {
message->data = message->mstring->str;
return 0; /* OK */
}
perror("read");
error:
if (message->mstring != NULL)
mmap_string_free(message->mstring);
return -1;
}
char *guessfrom(void) {
#ifndef WIN32
uid_t uid;
struct passwd *pw;
char hostname[256];
int len;
char *gfrom;
if (gethostname(hostname, sizeof(hostname))) {
perror("gethostname");
return NULL;
}
hostname[sizeof(hostname) - 1] = '\0';
uid = getuid();
pw = getpwuid(uid);
len = ((pw != NULL) ? strlen(pw->pw_name) : 12)
+ strlen(hostname) + 2;
if ((gfrom = malloc(len)) == NULL) {
perror("malloc");
return NULL;
}
if (pw != NULL && pw->pw_name != NULL)
snprintf(gfrom, len, "%s@%s", pw->pw_name, hostname);
else
snprintf(gfrom, len, "#%u@%s", uid, hostname);
return gfrom;
#else
return NULL;
#endif
}
void release(struct mem_message *message) {
if (message->mstring != NULL)
mmap_string_free(message->mstring);
#ifndef MMAP_UNAVAILABLE
else if (message->data != NULL)
munmap(message->data, message->len);
#endif
}
int send_message(char *data, size_t len, char**rcpts) {
int s = -1;
int ret;
char **r;
int esmtp = 0;
mailsmtp *smtp = NULL;
if ((smtp = mailsmtp_new(0, NULL)) == NULL) {
perror("mailsmtp_new");
goto error;
}
/* first open the stream */
if ((ret = mailsmtp_socket_connect(smtp,
(smtp_server != NULL ? smtp_server : "localhost"),
smtp_port)) != MAILSMTP_NO_ERROR) {
fprintf(stderr, "mailsmtp_socket_connect: %s\n", mailsmtp_strerror(ret));
goto error;
}
/* then introduce ourselves */
if (smtp_esmtp && (ret = mailesmtp_ehlo(smtp)) == MAILSMTP_NO_ERROR)
esmtp = 1;
else if (!smtp_esmtp || ret == MAILSMTP_ERROR_NOT_IMPLEMENTED)
ret = mailsmtp_helo(smtp);
if (ret != MAILSMTP_NO_ERROR) {
fprintf(stderr, "mailsmtp_helo: %s\n", mailsmtp_strerror(ret));
goto error;
}
if (esmtp && smtp_tls &&
(ret = mailsmtp_socket_starttls(smtp)) != MAILSMTP_NO_ERROR) {
fprintf(stderr, "mailsmtp_starttls: %s\n", mailsmtp_strerror(ret));
goto error;
}
if (esmtp && smtp_tls) {
/* introduce ourselves again */
if (smtp_esmtp && (ret = mailesmtp_ehlo(smtp)) == MAILSMTP_NO_ERROR)
esmtp = 1;
else if (!smtp_esmtp || ret == MAILSMTP_ERROR_NOT_IMPLEMENTED)
ret = mailsmtp_helo(smtp);
if (ret != MAILSMTP_NO_ERROR) {
fprintf(stderr, "mailsmtp_helo: %s\n", mailsmtp_strerror(ret));
goto error;
}
}
if (esmtp && smtp_user != NULL &&
(ret = mailsmtp_auth(smtp, smtp_user,
(smtp_password != NULL) ? smtp_password : ""))
!= MAILSMTP_NO_ERROR) {
fprintf(stderr, "mailsmtp_auth: %s: %s\n", smtp_user, mailsmtp_strerror(ret));
goto error;
}
/* source */
if ((ret = (esmtp ?
mailesmtp_mail(smtp, smtp_from, 1, "etPanSMTPTest") :
mailsmtp_mail(smtp, smtp_from))) != MAILSMTP_NO_ERROR) {
fprintf(stderr, "mailsmtp_mail: %s, %s\n", smtp_from, mailsmtp_strerror(ret));
goto error;
}
/* recipients */
for (r = rcpts; *r != NULL; r++) {
if ((ret = (esmtp ?
mailesmtp_rcpt(smtp, *r,
MAILSMTP_DSN_NOTIFY_FAILURE|MAILSMTP_DSN_NOTIFY_DELAY,
NULL) :
mailsmtp_rcpt(smtp, *r))) != MAILSMTP_NO_ERROR) {
fprintf(stderr, "mailsmtp_rcpt: %s: %s\n", *r, mailsmtp_strerror(ret));
goto error;
}
}
/* message */
if ((ret = mailsmtp_data(smtp)) != MAILSMTP_NO_ERROR) {
fprintf(stderr, "mailsmtp_data: %s\n", mailsmtp_strerror(ret));
goto error;
}
if ((ret = mailsmtp_data_message(smtp, data, len)) != MAILSMTP_NO_ERROR) {
fprintf(stderr, "mailsmtp_data_message: %s\n", mailsmtp_strerror(ret));
goto error;
}
mailsmtp_free(smtp);
return 0;
error:
if (smtp != NULL)
mailsmtp_free(smtp);
if (s >= 0)
close(s);
return -1;
}
int main(int argc, char **argv) {
struct mem_message message;
int r;
#if HAVE_GETOPT_LONG
int indx;
static struct option long_options[] = {
{"server", 1, 0, 's'},
{"port", 1, 0, 'p'},
{"user", 1, 0, 'u'},
{"password", 1, 0, 'v'},
{"from", 1, 0, 'f'},
{"tls", 0, 0, 'S'},
{"no-esmtp", 0, 0, 'E'},
};
#endif
while(1) {
#if HAVE_GETOPT_LONG
r = getopt_long(argc, argv, "s:p:u:v:f:SE", long_options, &indx);
#else
r = getopt(argc, argv, "s:p:u:v:f:SE");
#endif
if (r < 0)
break;
switch (r) {
case 's':
if (smtp_server != NULL)
free(smtp_server);
smtp_server = strdup(optarg);
break;
case 'p':
smtp_port = (uint16_t) strtoul(optarg, NULL, 10);
break;
case 'u':
if (smtp_user != NULL)
free(smtp_user);
smtp_user = strdup(optarg);
break;
case 'v':
if (smtp_password != NULL)
free(smtp_password);
smtp_password = strdup(optarg);
break;
case 'f':
if (smtp_from != NULL)
free(smtp_from);
smtp_from = strdup(optarg);
break;
case 'S':
smtp_tls = 1;
break;
case 'E':
smtp_esmtp = 0;
break;
}
}
argc -= optind;
argv += optind;
if (argc < 1) {
fprintf(stderr, "usage: smtpsend [-f from] [-u user] [-v password] [-s server] [-p port] [-S] <rcpts>...\n");
return EXIT_FAILURE;
}
if (smtp_from == NULL && (smtp_from = guessfrom()) == NULL) {
fprintf(stderr, "can't guess a valid from, please use -f option.\n");
return EXIT_FAILURE;
}
/* reads message from stdin */
if (collect(&message))
return EXIT_FAILURE;
send_message(message.data, message.len, argv);
release(&message);
fprintf(stdout, "Sent ok.\n");
return EXIT_SUCCESS;
}
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