sendmail.c

/* 
 *  PHP Sendmail for NetWare.
 *
 *  This code is based on the sendmail.c file under Win32 folder
 *
 *  This file is rewriten specificly for PHPFI.  Some functionality
 *  has been removed (MIME and file attachments).  This code was 
 *  modified from code based on code writen by Jarle Aase.
 *
 *  This class is based on the original code by Jarle Aase, see bellow:
 *  wSendmail.cpp  It has been striped of some functionality to match
 *  the requirements of phpfi.
 *
 *  Very simple SMTP Send-mail program for sending command-line level
 *  emails and CGI-BIN form response for the Windows platform.
 *
 *  The complete wSendmail package with source code can be located
 *  from http://www.jgaa.com
 *
 */

#include "php.h"				/*php specific */
#include <stdio.h>
#include <stdlib.h>
#ifdef USE_WINSOCK
/*#include <ws2nlm.h>*/
#include <novsock2.h>
#else
//#include <sys/socket.h>
#include <netinet\in.h>
#include <ws2name.h>
#endif

#include "time.h"
#include <string.h>
//#include <malloc.h>
//#include <memory.h>
//#include <winbase.h>
#include "sendmail.h"
#include "php_ini.h"


static char *days[] =
{"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"};
static char *months[] =
{"Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};


#ifndef THREAD_SAFE
char Buffer[MAIL_BUFFER_SIZE];

/* socket related data */
typedef int       SOCKET;
typedef struct sockaddr_in SOCKADDR_IN;
typedef struct sockaddr * LPSOCKADDR;
typedef struct hostent * LPHOSTENT;

#define INVALID_SOCKET  (SOCKET)(~0)

SOCKET sc;
//WSADATA Data;
//struct hostent *adr;
SOCKADDR_IN sock_in;
//int WinsockStarted;
/* values set by the constructor */
//char *AppName;
char MailHost[HOST_NAME_LEN];
char LocalHost[HOST_NAME_LEN];
#endif


char seps[] = " ,\t\n";
char *php_mailer = "PHP 4.0 NetWare";

char *get_header(char *h, char *headers);

/* Error messages */
static char *ErrorMessages[] =
{
	{"Success"},
	{"Bad arguments from form"},
	{"Unable to open temporary mailfile for read"},
	{"Failed to Start Sockets"},
	{"Failed to Resolve Host"},
	{"Failed to obtain socket handle"},
	{"Failed to Connect"},
	{"Failed to Send"},
	{"Failed to Receive"},
	{"Server Error"},
	{"Failed to resolve the host IP name"},
	{"Out of memory"},
	{"Unknown error"},
	{"Bad Message Contents"},
	{"Bad Message Subject"},
	{"Bad Message destination"},
	{"Bad Message Return Path"},
	{"Bad Mail Host"},
	{"Bad Message File"},
	{"PHP Internal error: php.ini sendmail from variable not set!"}
};


/*********************************************************************
// Name:  TSendMail
// Input:   1) host:    Name of the mail host where the SMTP server resides
//                      max accepted length of name = 256
//          2) appname: Name of the application to use in the X-mailer
//                      field of the message. if NULL is given the application
//                      name is used as given by the GetCommandLine() function
//                      max accespted length of name = 100
// Output:  1) error:   Returns the error code if something went wrong or
//                      SUCCESS otherwise.
//
//  See SendText() for additional args!
//********************************************************************/
int TSendMail(char *host, int *error,
			  char *headers, char *Subject, char *mailTo, char *data)
{
	int ret;
	char *RPath = NULL;

	if (host == NULL) {
		*error = BAD_MAIL_HOST;
		return BAD_MAIL_HOST;
	} else if (strlen(host) >= HOST_NAME_LEN) {
		*error = BAD_MAIL_HOST;
		return BAD_MAIL_HOST;
	} else {
		strcpy(MailHost, host);
	}

	if (INI_STR("sendmail_from")){
		RPath = estrdup(INI_STR("sendmail_from"));
		} else {
			return 19;
	}

	/* attempt to connect with mail host */
	*error = MailConnect();
	if (*error != 0) {
		if(RPath)efree(RPath);
		return *error;
	} else {
		ret = SendText(RPath, Subject, mailTo, data, headers);
		TSMClose();
		if (ret != SUCCESS) {
			*error = ret;
		}
		if(RPath)efree(RPath);
		return ret;
	}
}


//********************************************************************
// Name:  TSMClose
// Input:
// Output:
// Description: DESTRUCTOR
// Author/Date:  jcar 20/9/96
// History:
//********************************************************************/
void TSMClose()
{
	Post("QUIT\r\n");
	Ack();
	/* to guarantee that the cleanup is not made twice and 
	   compomise the rest of the application if sockets are used
	   elesewhere 
	*/

	shutdown(sc, 0);

	/* closesocket commented out since it was giving undefined symbol linker error
	   close added in its place */
//	closesocket(sc);
	close(sc);
}


/*********************************************************************
// Name:  char *GetSMErrorText
// Input:   Error index returned by the menber functions
// Output:  pointer to a string containing the error description
// Description:
// Author/Date:  jcar 20/9/96
// History:
//*******************************************************************/
char *GetSMErrorText(int index)
{

	if ((index > MAX_ERROR_INDEX) || (index < MIN_ERROR_INDEX))
		return (ErrorMessages[UNKNOWN_ERROR]);
	else
		return (ErrorMessages[index]);
}


/*********************************************************************
// Name:  TSendText
// Input:       1) RPath:   return path of the message
//                                  Is used to fill the "Return-Path" and the
//                                  "X-Sender" fields of the message.
//                  2) Subject: Subject field of the message. If NULL is given
//                                  the subject is set to "No Subject"
//                  3) mailTo:  Destination address
//                  4) data:        Null terminated string containing the data to be send.
// Output:      Error code or SUCCESS
// Description:
// Author/Date:  jcar 20/9/96
// History:
//*******************************************************************/
int SendText(char *RPath, char *Subject, char *mailTo, char *data, char *headers)
{
	int res, i;
	char *p;
	char *tempMailTo, *token, *pos1, *pos2;

	/* check for NULL parameters */
	if (data == NULL)
		return (BAD_MSG_CONTENTS);
	if (mailTo == NULL)
		return (BAD_MSG_DESTINATION);
	if (RPath == NULL)
		return (BAD_MSG_RPATH);

	/* simple checks for the mailto address */
	/* have ampersand ? */
	if (strchr(mailTo, '@') == NULL)
		return (BAD_MSG_DESTINATION);

	sprintf(Buffer, "HELO %s\r\n", LocalHost);

	/* in the beggining of the dialog */
	/* attempt reconnect if the first Post fail */
	if ((res = Post(Buffer)) != SUCCESS) {
		MailConnect();
		if ((res = Post(Buffer)) != SUCCESS)
			return (res);
	}
	if ((res = Ack()) != SUCCESS)
		return (res);

	sprintf(Buffer, "MAIL FROM:<%s>\r\n", RPath);
	if ((res = Post(Buffer)) != SUCCESS)
		return (res);
	if ((res = Ack()) != SUCCESS)
		return (res);


	tempMailTo = estrdup(mailTo);
	
	/* Send mail to all rcpt's */
	token = strtok(tempMailTo, ",");
	while(token != NULL)
	{
		sprintf(Buffer, "RCPT TO:<%s>\r\n", token);
		if ((res = Post(Buffer)) != SUCCESS)
			return (res);
		if ((res = Ack()) != SUCCESS)
			return (res);
		token = strtok(NULL, ",");
	}

	/* Send mail to all Cc rcpt's */
	efree(tempMailTo);
	if (headers && (pos1 = strstr(headers, "Cc:"))) {
		pos2 = strstr(pos1, "\r\n");
		tempMailTo = estrndup(pos1, pos2-pos1);

		token = strtok(tempMailTo, ",");
		while(token != NULL)
		{
			sprintf(Buffer, "RCPT TO:<%s>\r\n", token);
			if ((res = Post(Buffer)) != SUCCESS)
				return (res);
			if ((res = Ack()) != SUCCESS)
				return (res);
			token = strtok(NULL, ",");
		}
		efree(tempMailTo);
	}

	if ((res = Post("DATA\r\n")) != SUCCESS)
		return (res);
	if ((res = Ack()) != SUCCESS)
		return (res);

	/* send message header */
	if (Subject == NULL)
		res = PostHeader(RPath, "No Subject", mailTo, headers);
	else
		res = PostHeader(RPath, Subject, mailTo, headers);
	if (res != SUCCESS)
		return (res);

	/* send message contents in 1024 chunks */
	if (strlen(data) <= 1024) {
		if ((res = Post(data)) != SUCCESS)
			return (res);
	} else {
		p = data;
		while (1) {
			if (*p == '\0')
				break;
			if (strlen(p) >= 1024)
				i = 1024;
			else
				i = strlen(p);

			/* put next chunk in buffer */
			strncpy(Buffer, p, i);
			Buffer[i] = '\0';
			p += i;

			/* send chunk */
			if ((res = Post(Buffer)) != SUCCESS)
				return (res);
		}
	}

	/*send termination dot */
	if ((res = Post("\r\n.\r\n")) != SUCCESS)
		return (res);
	if ((res = Ack()) != SUCCESS)
		return (res);

	return (SUCCESS);
}


/*********************************************************************
// Name:  PostHeader
// Input:       1) return path
//                  2) Subject
//                  3) destination address
//                  4) DoMime flag
// Output:      Error code or Success
// Description:
// Author/Date:  jcar 20/9/96
// History:
//********************************************************************/
int PostHeader(char *RPath, char *Subject, char *mailTo, char *xheaders)
{

	/* Print message header according to RFC 822 */
	/* Return-path, Received, Date, From, Subject, Sender, To, cc */

	time_t tNow = time(NULL);
	struct tm *tm = localtime(&tNow);
	int zoneh = abs(_timezone);
	int zonem, res;
	char *p;

	p = Buffer;
	zoneh /= (60 * 60);
	zonem = (abs(_timezone) / 60) - (zoneh * 60);

	if(!xheaders || !strstr(xheaders, "Date:")){
		p += sprintf(p, "Date: %s, %02d %s %04d %02d:%02d:%02d %s%02d%02d\r\n",
					 days[tm->tm_wday],
					 tm->tm_mday,
					 months[tm->tm_mon],
					 tm->tm_year + 1900,
					 tm->tm_hour,
					 tm->tm_min,
					 tm->tm_sec,
					 (_timezone > 0) ? "+" : (_timezone < 0) ? "-" : "",
					 zoneh,
					 zonem);
	}

	if(!xheaders || !strstr(xheaders, "From:")){
		p += sprintf(p, "From: %s\r\n", RPath);
	}
	p += sprintf(p, "Subject: %s\r\n", Subject);
	if(!xheaders || !strstr(xheaders, "To:")){
		p += sprintf(p, "To: %s\r\n", mailTo);
	}
	if(xheaders){
		p += sprintf(p, "%s\r\n", xheaders);
	}

	if ((res = Post(Buffer)) != SUCCESS)
		return (res);

	if ((res = Post("\r\n")) != SUCCESS)
		return (res);

	return (SUCCESS);
}


/*********************************************************************
// Name:  MailConnect
// Input:   None
// Output:  None
// Description: Connect to the mail host and receive the welcome message.
// Author/Date:  jcar 20/9/96
// History:
//********************************************************************/
int MailConnect()
{
	int res;
	short portnum;

	/* Create Socket */
	if ((sc = socket(PF_INET, SOCK_STREAM, 0)) == INVALID_SOCKET)
		return (FAILED_TO_OBTAIN_SOCKET_HANDLE);

	/* Get our own host name */
	if (gethostname(LocalHost, HOST_NAME_LEN))
		return (FAILED_TO_GET_HOSTNAME);

	/* Resolve the servers IP */
	/*
	if (!isdigit(MailHost[0])||!gethostbyname(MailHost))
	{
		return (FAILED_TO_RESOLVE_HOST);
	}
        */

	portnum = (short) INI_INT("sendmail_port");
	if (!portnum) {
		portnum = 25;
	}

	/* Connect to server */
	sock_in.sin_family = AF_INET;
	sock_in.sin_port = htons(portnum);
	sock_in.sin_addr.S_un.S_addr = GetAddr(MailHost);

	if (connect(sc, (LPSOCKADDR) & sock_in, sizeof(sock_in)))
		return (FAILED_TO_CONNECT);

	/* receive Server welcome message */
	res = Ack();
	return (res);
}


/*********************************************************************
// Name:  Post
// Input:
// Output:
// Description:
// Author/Date:  jcar 20/9/96
// History:
//********************************************************************/
int Post(char * msg)
{
	int len = strlen(msg);
	int slen;
	int index = 0;

	while (len > 0) {
		if ((slen = send(sc, msg + index, len, 0)) < 1)
			return (FAILED_TO_SEND);
		len -= slen;
		index += slen;
	}
	return (SUCCESS);
}


/*********************************************************************
// Name:  Ack
// Input:
// Output:
// Description:
// Get the response from the server. We only want to know if the
// last command was successful.
// Author/Date:  jcar 20/9/96
// History:
//********************************************************************/
int Ack()
{
	static char *buf;
	int rlen;
	int Index = 0;
	int Received = 0;

	if (!buf)
		if ((buf = (char *) malloc(1024 * 4)) == NULL)
			return (OUT_OF_MEMORY);

  again:

	if ((rlen = recv(sc, buf + Index, ((1024 * 4) - 1) - Received, 0)) < 1)
		return (FAILED_TO_RECEIVE);

	Received += rlen;
	buf[Received] = 0;
	/*err_msg   fprintf(stderr,"Received: (%d bytes) %s", rlen, buf + Index); */

	/* Check for newline */
	Index += rlen;
	
	if ((buf[Received - 4] == ' ' && buf[Received - 3] == '-') ||
	    (buf[Received - 2] != '\r') || (buf[Received - 1] != '\n'))
		/* err_msg          fprintf(stderr,"Incomplete server message. Awaiting CRLF\n"); */
		goto again;				/* Incomplete data. Line must be terminated by CRLF
		                           And not contain a space followed by a '-' */

	if (buf[0] > '3')
		return (SMTP_SERVER_ERROR);

	return (SUCCESS);
}


/*********************************************************************
// Name:  unsigned long GetAddr (LPSTR szHost)
// Input:
// Output:
// Description: Given a string, it will return an IP address.
//   - first it tries to convert the string directly
//   - if that fails, it tries o resolve it as a hostname
//
// WARNING: gethostbyname() is a blocking function
// Author/Date:  jcar 20/9/96
// History:
//********************************************************************/
unsigned long GetAddr(char * szHost)
{
	LPHOSTENT lpstHost;
	u_long lAddr = INADDR_ANY;

	/* check that we have a string */
	if (*szHost) {

		/* check for a dotted-IP address string */
		lAddr = inet_addr(szHost);

		/* If not an address, then try to resolve it as a hostname */
		if ((lAddr == INADDR_NONE) && (strcmp(szHost, "255.255.255.255"))) {

			/*
			   Added the (LPHOSTENT) typecasting since the CodeWarrior compiler
			   was cribbing without that:
			   " illegal implicit conversion from 'int' to 'struct hostent *' "
			 */
			lpstHost = (LPHOSTENT) gethostbyname(szHost);

			if (lpstHost) {		/* success */
				/*
				   The below line commented since it is giving compiler error.
				   The next line is done in its place. But it is WRONG and
				   we need to get the below line to work.
				   Due to this work-around, the mail functionality will not work
				   if the "server name" of the mail server is given.
				   It only works when the IP address is given.
				*/
//				lAddr = *((u_long FAR *) (lpstHost->h_addr));
				lAddr = (u_long) 0xf;

			} else {
				lAddr = INADDR_ANY;		/* failure */
			}
		}
	}
	return (lAddr);
}								/* end GetAddr() */