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smtp.c
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smtp.c
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/*
** SMTP routines for mailsend - a simple mail sender via SMTP
**
** Limitations and Comments:
** SMTP RF[C] RFC-821
** Also look at: TCP/IP Illustraged Vol 1 by Richard Stevens
**
** Written mainly for NT, Unix has this kind of tools in hundreds.
**
** Development History:
** who when why
** muquit@muquit.com Mar-26-2001 first cut
*/
#include "mailsend.h"
static char buf[BUFSIZ];
static int bufsz = sizeof(buf) - 1;
static int break_out=0;
static char smtp_line[BUFSIZ];
static char smtp_errbuf[BUFSIZ];
static int smtp_code;
static int smtp_sep;
static int s_esmtp=0;
#ifdef WINNT
static BOOL
WINAPI CntrlHandler(DWORD CtrlEvent);
#else
#define closesocket close
#endif /* WINNT */
void smtpDisconnect(void)
{
msock_close();
}
/* connect to SMTP server and returns the socket fd */
static SOCKET smtpConnect(char *smtp_server,int port)
{
SOCKET
sfd;
if (g_use_protocol == MSOCK_USE_IPV4)
{
showVerbose("Forcing to use IPv4 address of SMTP server\n");
}
else if (g_use_protocol == MSOCK_USE_IPV6)
{
showVerbose("Forcing to use IPv6 address of SMTP server\n");
}
else
{
showVerbose("Will detect IPv4 or IPv6 automatically\n");
}
sfd=clientSocket(g_use_protocol, smtp_server,port, g_connect_timeout);
if (sfd == INVALID_SOCKET)
{
errorMsg("Could not connect to SMTP server \"%s\" at port %d",
smtp_server,port);
return (INVALID_SOCKET);
}
/* set the socket to msock lib's static place, not thread safe*/
msock_set_socket(sfd);
return (sfd);
}
int read_smtp_multi_lines(void)
{
int
rc,
lcnt = 0;
if (smtp_sep == A_DASH)
{
for (;;)
{
rc=read_smtp_line();
if (rc < 0)
break;
lcnt++;
if (lcnt >= 100)
{
errorMsg("Too many lines from server\n");
rc=(-1);
goto ExitProcessing;
}
if (smtp_sep != A_DASH)
break;
}
}
smtp_sep = A_SPACE;
return(0);
ExitProcessing:
return(1);
}
/*
* sfd socket
*
* return 0 on success, -1 on failure
*
* populates globals: smtp_code,smtp_line and smtp_errbuf on error
*
*/
int read_smtp_line(void)
{
int
rc=(-1),
n;
char
tbuf[BUFSIZ],
lbuf[BUFSIZ];
memset(smtp_line,0,sizeof(smtp_line));
memset(smtp_errbuf,0,sizeof(smtp_errbuf));
smtp_code=(-1);
memset(lbuf,0,sizeof(lbuf));
/* read a line */
n=msock_gets(lbuf,sizeof(lbuf)-1, g_read_timeout);
if (n < 3 )
{
/*errorMsg("Error reading SMTP line, read %d bytes",n);*/
return(-1);
}
showVerbose("[S] %s\n",lbuf);
if (n >= 5)
{
memset(tbuf,0,sizeof(tbuf));
memcpy(tbuf,lbuf,3);
smtp_code=atoi(tbuf);
smtp_sep=lbuf[3];
(void) snprintf(smtp_line,sizeof(smtp_line)-1,"%s",lbuf + 4);
rc=0;
/*
(void) fprintf(stderr," Line: \"%s\"\n",lbuf);
(void) fprintf(stderr," Code: \"%d\"\n",smtp_code);
(void) fprintf(stderr," Sep: '%c'\n",smtp_sep);
(void) fprintf(stderr," line: \"%s\"\n",smtp_line);
*/
}
else
{
(void) snprintf(smtp_errbuf,sizeof(smtp_errbuf)-1,"%s",lbuf);
}
return(rc);
}
int smtp_start_tls(int sfd)
{
int
rc=(-1);
#ifdef HAVE_OPENSSL
SSL
*ssl=NULL;
#endif /* HAVE_OPENSSL */
memset(buf,0,sizeof(buf));
(void) snprintf(buf,sizeof(buf)-1,"%s\r\n","STARTTLS");
showVerbose("[C] %s",buf);
msock_puts(buf);
rc=read_smtp_line();
if (smtp_code != 220)
{
errorMsg("Unknown STARTTLS response code %d\n",smtp_code);
return(-1);
}
#ifdef HAVE_OPENSSL
ssl=msock_get_ssl();
if (ssl)
{
if (!SSL_set_fd(ssl,sfd))
{
errorMsg("failed to set socket to SSL\n");
return(-1);
}
/* must set back to msock's static */
msock_set_ssl(ssl);
rc=SSL_connect(ssl);
if (rc < 1)
{
errorMsg("SSL connection failed\n");
ERR_print_errors_fp(stderr);
return(-1);
}
print_cert_info(ssl);
/* tell msock everything is ssl after that */
msock_turn_ssl_on();
rc=0;
}
else
{
errorMsg("Could not start STARTTLS, SSL not initialized properly");
rc=(-1);
}
#else
errorMsg("Not Compiled with OpenSSL, will not try STARTTLS");
rc=(-1);
#endif /*HAVE_OPENSSL */
return(rc);
}
/* SMTP: HELO */
static int say_helo(char *helo_domain)
{
int
cnt=0,
rc;
(void) snprintf(buf,sizeof(buf)-1,"%s %s\r\n",
s_esmtp ? "EHLO" : "HELO",helo_domain);
showVerbose("[C] %s",buf);
/* send */
msock_puts(buf);
rc=read_smtp_line();
if (smtp_code != 250)
{
errorMsg("%s failed", s_esmtp ? "EHLO" : "HELO");
return(-1);
}
/* read all the capabilities if separator is - */
if (smtp_sep == A_DASH)
{
for (;;)
{
rc=read_smtp_line();
if (rc == 0)
add_server_cap_to_list(smtp_line);
cnt++;
if (cnt >= 1000)
break;
if (rc < 0 || smtp_sep != A_DASH)
break;
}
}
smtp_sep = A_SPACE;
return(rc);
}
/* SMTP: MAIL FROM */
static int smtp_MAIL_FROM(char *from)
{
memset(buf,0,sizeof(buf));
(void) snprintf(buf,sizeof(buf)-1,"MAIL FROM: <%s>\r\n",from);
showVerbose("[C] %s",buf);
msock_puts(buf);
read_smtp_line();
if (smtp_code != 250)
{
errorMsg("MAIL FROM failed: '%d %s'",smtp_code,smtp_line);
return(-1);
}
return(0);
}
/* SMTP: quit */
static int smtp_QUIT(void)
{
showVerbose("[C] QUIT\r\n");
msock_puts("QUIT\r\n");
read_smtp_line();
/*
** google does not seem to write anything back in response to QUIT
** command. I'll ignore it anyway
*/
return(0);
}
/* SMTP: RSET */
/* aborts current mail transaction and cause both ends to reset */
static int smtp_RSET()
{
msock_puts("RSET\r\n");
return(read_smtp_line());
}
/* SMTP: RCPT TO */
static int smtp_RCPT_TO(void)
{
Sll
*l,
*al;
Address
*a;
char
*x;
int
rc;
al=getAddressList();
for (l=al; l; l=l->next)
{
a=(Address *) l->data;
if (! a)
return(-1);
if (! a->address)
return(-1);
memset(buf,0,sizeof(buf));
x=getenv("NOTIFY_RCPT");
if (x != NULL)
{
/* MS Exchange has it */
showVerbose("NOTIFY_RCPT=%s\n",x);
(void) snprintf(buf,sizeof(buf)-1,"RCPT TO: %s %s\r\n",
a->address,x);
}
else
{
(void) snprintf(buf,sizeof(buf)-1,"RCPT TO: <%s>\r\n",a->address);
}
showVerbose("[C] %s",buf);
msock_puts(buf);
rc=read_smtp_line();
if (rc == 0)
{
if (smtp_code != 250)
{
errorMsg("RCPT TO: <%s> failed '%d:%s'\n",
a->address,smtp_code,smtp_line);
smtp_RSET();
return(-1);
}
}
}
return (0);
}
/* SMTP: DATA */
static int smtp_DATA(void)
{
int
rc;
msock_puts("DATA\r\n");
showVerbose("[C] DATA\r\n");
rc=read_smtp_line();
if (rc == 0)
{
if (smtp_code != 354)
{
errorMsg("DATA failed: '%d %s'\n",smtp_code,smtp_line);
return(-1);
}
}
return(0);
}
/* SMTP: EOM */
/* return 0 on success, -1 on failure */
int smtpEom(int sfd)
{
int
rc;
msock_puts("\r\n.\r\n");
showVerbose("\r\n[C] .\r\n");
/*
** Bug# 1
** we want to see smtp code 250 now
** if mail is too big, it can mail with 552 message too large
*/
rc = read_smtp_line();
if (smtp_code != 250)
{
read_smtp_multi_lines();
errorMsg("Expected smtp code 250, got %d\n",smtp_code);
rc = (-1);
}
return(rc);
}
void doCleanup(void)
{
smtpDisconnect();
}
#ifdef WINNT
/*
** Handle Ctrl+C
*/
static BOOL WINAPI CntrlHandler(DWORD CtrlEvent)
{
break_out=0;
switch (CtrlEvent)
{
case CTRL_C_EVENT:
{
break_out=1;
(void) fprintf(stderr,"\nNot sending mail. Exiting.......\n");
exit_error();
break;
}
}
return (TRUE);
}
#endif /* WINNT */
int write_to_socket(char *str)
{
int
n;
if (str == NULL)
{
return (-1);
}
n = msock_puts(str);
/*showVerbose("%d bytes: %s\n",n, str);*/
return(n);
}
/*
** return 0 on success
*/
int encode2base64andwrite2socket(const char *str)
{
FILE
*tfp1 = NULL,
*tfp2 = NULL;
char
mbuf[1000],
oneline_tempfile1[MUTILS_PATH_MAX],
oneline_tempfile2[MUTILS_PATH_MAX];
memset(oneline_tempfile1, 0, sizeof(oneline_tempfile1));
/* write the text to a tmp file */
tfp1 = mutils_get_tempfileFP(oneline_tempfile1,
sizeof(oneline_tempfile1)-1);
if (tfp1 == NULL)
{
errorMsg("%s (%d) - Could not open temp file1 for writing (%s)",
MFL,
ERR_STR);
return (-1);
}
(void) fprintf(tfp1,"%s",str);
(void) fclose(tfp1);
/* open another tmp file to write the base64 of the first tmp file to */
memset(oneline_tempfile2, 0, sizeof(oneline_tempfile2));
tfp2 = mutils_get_tempfileFP(oneline_tempfile2,
sizeof(oneline_tempfile2)-1);
showVerbose("Oneline temp file2: * %s\n",oneline_tempfile2);
if (tfp2 == NULL)
{
errorMsg("%s (%d) - Could not open temp file2 for writing (%s)",
MFL,
ERR_STR);
return (-1);
}
tfp1 = fopen(oneline_tempfile1,"rb");
if (tfp1 == NULL)
{
errorMsg("%s (%d) - Could not open temp file for reading (%s)",
MFL,
ERR_STR);
return(-1);
}
mutilsBase64Encode(tfp1,tfp2);
(void) fclose(tfp1);
(void) fclose(tfp2);
/* open the file with base64 and write the content to socket */
tfp2 = fopen(oneline_tempfile2,"r");
if (tfp2 == NULL)
{
errorMsg("%s (%d) - Could not open temp file for reading (%s)",
MFL,
ERR_STR);
return(-1);
}
while(fgets(mbuf, sizeof(mbuf)-1, tfp2))
{
write_to_socket(mbuf);
if (g_show_attachment_in_log)
{
showVerbose("[C] %s",mbuf);
}
}
(void) fclose(tfp2);
unlink(oneline_tempfile1);
unlink(oneline_tempfile2);
return(0);
}
/*
** send one line messages, each one is an inline attachment
** return 0 if mail is sent, -1 otherwise
*/
int process_oneline_messages(const char *boundary)
{
Attachment
*a = NULL;
Sll
*l,
*oneline_attachment_list;
oneline_attachment_list = get_oneline_attachment_list();
if (oneline_attachment_list == NULL)
{
return(0);
}
print_oneline_attachment_list();
for (l = oneline_attachment_list; l; l = l->next)
{
a = (Attachment *) l->data;
(void) snprintf(buf, bufsz, "\r\n--%s\r\n",boundary);
write_to_socket(buf);
if (strcmp(a->charset,"none") != 0)
{
(void) snprintf(buf, bufsz, "Content-Type: %s; charset=%s\r\n",
a->mime_type,
a->charset);
}
else
{
(void) snprintf(buf, bufsz, "Content-Type: %s\r\n",a->mime_type);
}
write_to_socket(buf);
(void) strcpy(buf,"Content-Disposition: inline\r\n");
write_to_socket(buf);
/* add encoding type if needed */
if (strncmp(a->content_transfer_encoding,"none",4) != 0)
{
(void) snprintf(buf, bufsz, "Content-Transfer-Encoding: %s\r\n\r\n",
a->content_transfer_encoding);
write_to_socket(buf);
}
if (strncmp(a->content_transfer_encoding,"base64",6) == 0)
{
/* encode the mssage to base 64 and write to socket */
encode2base64andwrite2socket(a->oneline_msg);
}
else
{
/*
** no encoding type, so last \r\n was no added, we must
** add it or some mailer will thing the mail is invalid
*/
if (strncmp(a->content_transfer_encoding,"none",4) == 0)
{
write_to_socket("\r\n");
}
write_to_socket(a->oneline_msg);
if (g_show_attachment_in_log)
{
showVerbose("[C] %s\n",a->oneline_msg);
}
}
write_to_socket("\r\n");
}
return(0);
}
/*
** include the content of the file as body of the message
** No encoding will be done.
*/
int include_msg_body(void)
{
Sll
*l,
*msg_body_attachment_head;
FILE
*fp = NULL;
Attachment
*a;
msg_body_attachment_head = get_msg_body_attachment_list();
if (msg_body_attachment_head == NULL)
{
return(-1);
}
l = msg_body_attachment_head;
a = (Attachment *) l->data;
(void) snprintf(buf,bufsz,"Mime-version: 1.0\r\n");
write_to_socket(buf);
if (strcmp(a->charset,"none") != 0)
{
(void) snprintf(buf,bufsz,"Content-Type: %s; charset=%s\r\n\r\n",
a->mime_type,
a->charset);
}
else
{
(void) snprintf(buf,bufsz,"Content-Type: %s\r\n\r\n",a->mime_type);
}
write_to_socket(buf);
fp=fopen(a->file_path,"r");
if (fp == (FILE *) NULL)
{
errorMsg("Could not open message body file: %s",a->file_path);
return (-1);
}
while (fgets(buf,bufsz,fp))
{
write_to_socket(buf);
if (g_show_attachment_in_log)
{
showVerbose("[C] %s",buf);
}
}
(void) fclose(fp);
(void) snprintf(buf,bufsz,"\r\n\r\n");
msock_puts(buf);
showVerbose(buf);
return(0);
}
int include_image(void)
{
return(0);
}
static void cleanup_attachment(Attachment *a)
{
if (a == NULL)
return;
if (a->fp_read)
{
(void) fclose(a->fp_read);
}
if (*a->mime_tmpfile != '\0')
{
unlink(a->mime_tmpfile);
}
}
/*
** return the attachment with fp_read member open.
** If encoding type requires some kind of encoding,
** mime_tmpfile will contain the file which holds the
** encoded content. The caller must close the file pointer
** and unlik the tmp_filename
** return NULL on error
*/
static Attachment *get_encoded_attachment(Attachment *a)
{
FILE
*fp_read = NULL,
*tfp_write = NULL;
int
tempfile_opened = 0;
if (strncmp(a->content_transfer_encoding, "base64", 6) == 0)
{
tfp_write = mutils_get_tempfileFP(a->mime_tmpfile,sizeof(a->mime_tmpfile)-1);
if (tfp_write == NULL)
{
errorMsg("%s (%d) - Could not create temp file for MIME (%s)",
MFL,
ERR_STR);
return(NULL);
}
tempfile_opened = 1;
showVerbose("%s (%d) - MIME temp file: %s created successfully, FILE pointer=%x\n",
MFL,
a->mime_tmpfile,
tfp_write);
/* open the file to attach */
fp_read = fopen(a->file_path,"rb");
if (fp_read == (FILE *) NULL)
{
errorMsg("%s (%d) - Could not open file for %s reading (%s)",
MFL,
a->file_path,
ERR_STR);
goto ExitProcessing;
}
showVerbose("%s (%d) - Writing Content to FILE pointer: %x\n",
MFL,
tfp_write);
/* write base64 content to tmp file */
mutilsBase64Encode(fp_read,tfp_write);
(void) fclose(fp_read);
fp_read = NULL;
(void) fclose(tfp_write);
tfp_write = NULL;
a->fp_read = fopen(a->mime_tmpfile, "r");
if (a->fp_read == (FILE *) NULL)
{
errorMsg("%s (%d) - Could not open file for %s reading (%s)",
MFL,
a->file_path,
ERR_STR);
goto ExitProcessing;
}
if (tempfile_opened)
{
unlink(a->mime_tmpfile);
}
return(a);
}
/* no tmp file */
memset(a->mime_tmpfile, 0, sizeof(a->mime_tmpfile));
/* open the attachment. caller must close it */
a->fp_read = fopen(a->file_path, "r");
if (a->fp_read == (FILE *) NULL)
{
errorMsg("%s (%d) - Could not open file for %s reading (%s)",
MFL,
a->file_path,
ERR_STR);
return (NULL);
}
return(a);
ExitProcessing:
if (tempfile_opened)
{
unlink(a->mime_tmpfile);
}
return(NULL);
}
/*
** write MIME headers, encode attachment if needed
** and write to socket
** returns 0 on success -1 on failure
*/
int send_attachment(Attachment *a, const char *boundary)
{
Attachment
*encoded_attachment;
encoded_attachment = get_encoded_attachment(a);
if (encoded_attachment == NULL)
{
errorMsg("%s (%d) - Could not encode attachment %s",
MFL,
a->file_path);
return(-1);
}
(void) snprintf(buf, bufsz,"--%s\r\n",boundary);
write_to_socket(buf);
if (a->charset && strncmp(a->charset,"none", 4) != 0)
{
(void) snprintf(buf, bufsz, "Content-Type: %s; charset=%s\r\n",
a->mime_type,
a->charset);
}
else
{
if (a->attachment_name)
{
(void) snprintf(buf, bufsz, "Content-Type: %s; name=\"%s\"\r\n",
a->mime_type,
a->attachment_name);
}
else
{
(void) snprintf(buf, bufsz, "Content-Type: %s\r\n",a->mime_type);
}
}
write_to_socket(buf);
if (a->content_id == NULL)
{
if (strncmp(a->content_disposition, "inline", 6) == 0)
{
(void) snprintf(buf, bufsz, "Content-Disposition: %s\r\n",a->content_disposition);
}
else
{
if (a->attachment_name)
{
(void) snprintf(buf, bufsz, "Content-Disposition: %s; filename=\"%s\"\r\n",
a->content_disposition,
a->attachment_name);
}
else if (a->file_name)
{
(void) snprintf(buf, bufsz, "Content-Disposition: %s; filename=\"%s\"\r\n",
a->content_disposition,
a->file_name);
}
else
{
(void) snprintf(buf, bufsz, "Content-Disposition: %s\r\n",a->content_disposition);
}
}
write_to_socket(buf);
}
if (a->content_id)
{
(void) snprintf(buf, bufsz, "Content-ID: <%s>\r\n",a->content_id);
write_to_socket(buf);
(void) snprintf(buf, bufsz, "X-Attachment-Id: %s\r\n",a->content_id);
write_to_socket(buf);
}
if (strncmp(a->content_transfer_encoding,"none",4) != 0)
{
(void) snprintf(buf, bufsz, "Content-Transfer-Encoding: %s\r\n\r\n",
a->content_transfer_encoding);
write_to_socket(buf);
}
else
{
write_to_socket("\r\n");
}
/* our FILE pointer is already open and read to read from */
while (fgets(buf, bufsz, a->fp_read))
{
write_to_socket(buf);
}
/* close file, remove tmp file if needed */
cleanup_attachment(a);
return(0);
}
int process_attachments(const char *boundary)
{
Attachment
*a;
Sll
*attachment_list,
*al;
int
rc;
attachment_list = get_attachment_list();
if (attachment_list == NULL)
{
return(0);
}
for (al=attachment_list; al; al=al->next)
{
a=(Attachment *) al->data;
if (a == NULL)
continue;
rc = send_attachment(a, boundary);
if (rc == -1)
{
errorMsg("%s (%d) - failed to send attachment %s\n",
MFL,
a->file_path);
return(-1);
}
}
(void) snprintf(buf,sizeof(buf)-1,"--%s--\r\n",boundary);
msock_puts(buf);
showVerbose(buf);
return(0);
}
/*
** Print multipart/mixed or multipart/related header
** if mixed and embedded images are specified, make
** to use multipart/alternative for the embedded images.
*/
int print_content_type_header(const char *boundary)
{
Sll
*oneline_attachment_list,
*attachment_list,
*embed_image_list;
(void) snprintf(buf, bufsz,"Mime-version: 1.0\r\n");
write_to_socket(buf);
if (*g_content_type!='\0')
{
(void) snprintf(buf,sizeof(buf)-1,"Content-type: %s; boundary=\"%s\"\r\n",
g_content_type,
boundary);
write_to_socket(buf);
return(0);
}
oneline_attachment_list = get_oneline_attachment_list();
attachment_list = get_attachment_list();
embed_image_list = get_embed_image_attachment_list();
if (oneline_attachment_list || attachment_list)
{
(void) snprintf(buf,sizeof(buf)-1,
"Content-type: multipart/mixed; boundary=\"%s\"\r\n", boundary);
write_to_socket(buf);
return(0);
}
if (embed_image_list)
{
(void) snprintf(buf,sizeof(buf)-1,
"Content-type: multipart/related; boundary=\"%s\"\r\n", boundary);
write_to_socket(buf);
return(0);
}
write_to_socket("\r\n");
return(0);
}
int process_embeded_images(const char *boundary)
{
char
*ib,
*b,
related[17],
cid[17],
tbuf[24],
alternative[17];
Attachment
*a;
Sll
*il,
*oneline_attachment_list,
*attachment_list,
*embed_image_list;
int
rc,
ic = 1;
oneline_attachment_list = get_oneline_attachment_list();
attachment_list = get_attachment_list();
embed_image_list = get_embed_image_attachment_list();
if (embed_image_list == NULL)
{
return(0);
}
memset(related, 0, sizeof(related));
memset(alternative, 0, sizeof(alternative));
mutilsGenerateMIMEBoundary(related,sizeof(related));
mutilsGenerateMIMEBoundary(alternative,sizeof(alternative));
b = boundary;
ib = boundary;
(void) snprintf(buf, bufsz, "--%s\r\n",boundary);
write_to_socket(buf);
if (attachment_list || oneline_attachment_list)
{
b = related;
ib = b;
(void) snprintf(buf, bufsz, "Content-Type: multipart/related; boundary=%s\r\n",b);
write_to_socket(buf);