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SMTPUtils.cpp
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SMTPUtils.cpp
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/*
* XMail by Davide Libenzi (Intranet and Internet mail server)
* Copyright (C) 1999,..,2010 Davide Libenzi
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Davide Libenzi <[email protected]>
*
*/
#include "SysInclude.h"
#include "SysDep.h"
#include "SvrDefines.h"
#include "ShBlocks.h"
#include "ResLocks.h"
#include "StrUtils.h"
#include "SList.h"
#include "BuffSock.h"
#include "SSLBind.h"
#include "SSLConfig.h"
#include "MailConfig.h"
#include "UsrUtils.h"
#include "UsrAuth.h"
#include "SvrUtils.h"
#include "MiscUtils.h"
#include "DNS.h"
#include "DNSCache.h"
#include "MessQueue.h"
#include "SMAILUtils.h"
#include "QueueUtils.h"
#include "SMTPSvr.h"
#include "SMTPUtils.h"
#include "Base64Enc.h"
#include "MD5.h"
#include "MailSvr.h"
#define STD_SMTP_TIMEOUT STD_SERVER_TIMEOUT
#define SMTPGW_LINE_MAX 1024
#define SMTPGW_TABLE_FILE "smtpgw.tab"
#define SMTPFWD_LINE_MAX 1024
#define SMTPFWD_TABLE_FILE "smtpfwd.tab"
#define SMTPRELAY_LINE_MAX 512
#define SMTP_RELAY_FILE "smtprelay.tab"
#define MAX_MX_RECORDS 32
#define SMTP_SPAMMERS_FILE "spammers.tab"
#define SMTP_SPAM_ADDRESS_FILE "spam-address.tab"
#define SPAMMERS_LINE_MAX 512
#define SPAM_ADDRESS_LINE_MAX 512
#define SMTPAUTH_LINE_MAX 512
#define SMTPCH_SUPPORT_SIZE (1 << 0)
#define SMTPCH_SUPPORT_TLS (1 << 1)
enum SmtpGwFileds {
gwDomain = 0,
gwGateway,
gwMax
};
enum SmtpFwdFileds {
fwdDomain = 0,
fwdGateway,
fwdOptions,
fwdMax
};
enum SmtpRelayFileds {
rlyFromIP = 0,
rlyFromMask,
rlyMax
};
enum SpammerFileds {
spmFromIP = 0,
spmFromMask,
spmMax
};
struct SmtpMXRecords {
int iNumMXRecords;
int iMXCost[MAX_MX_RECORDS];
char *pszMXName[MAX_MX_RECORDS];
int iCurrMxCost;
};
struct SmtpChannel {
BSOCK_HANDLE hBSock;
unsigned long ulFlags;
unsigned long ulMaxMsgSize;
SYS_INET_ADDR SvrAddr;
char *pszServer;
char *pszDomain;
};
static int USmtpGetResponse(BSOCK_HANDLE hBSock, char *pszResponse, int iMaxResponse,
int iTimeout = STD_SMTP_TIMEOUT);
static int USmtpSendCommand(BSOCK_HANDLE hBSock, char const *pszCommand,
char *pszResponse, int iMaxResponse, int iTimeout = STD_SMTP_TIMEOUT);
static char *USmtpGetGwTableFilePath(char *pszGwFilePath, int iMaxPath)
{
CfgGetRootPath(pszGwFilePath, iMaxPath);
StrNCat(pszGwFilePath, SMTPGW_TABLE_FILE, iMaxPath);
SysLogMessage(LOG_LEV_DEBUG, "Going to look at config file: '%s'\n", pszGwFilePath);
return pszGwFilePath;
}
static char *USmtpGetFwdTableFilePath(char *pszFwdFilePath, int iMaxPath)
{
CfgGetRootPath(pszFwdFilePath, iMaxPath);
StrNCat(pszFwdFilePath, SMTPFWD_TABLE_FILE, iMaxPath);
SysLogMessage(LOG_LEV_DEBUG, "Going to look at config file: '%s'\n", pszFwdFilePath);
return pszFwdFilePath;
}
static void USmtpCleanupGateway(SMTPGateway *pGw)
{
SysFree(pGw->pszHost);
SysFree(pGw->pszIFace);
}
static void USmtpFreeGateway(SMTPGateway *pGw)
{
USmtpCleanupGateway(pGw);
SysFree(pGw);
}
static SMTPGateway *USmtpCloneGateway(SMTPGateway const *pRefGw, char const *pszHost)
{
SMTPGateway *pGw;
if ((pGw = (SMTPGateway *) SysAlloc(sizeof(SMTPGateway))) == NULL)
return NULL;
pGw->ulFlags = pRefGw->ulFlags;
pGw->pszHost = SysStrDup(pszHost);
pGw->pszIFace = (pRefGw->pszIFace) ? SysStrDup(pRefGw->pszIFace): NULL;
return pGw;
}
static int USmtpOptionsAssign(void *pPrivate, char const *pszName, char const *pszValue)
{
SMTPGateway *pGw = (SMTPGateway *) pPrivate;
if (strcmp(pszName, "NeedTLS") == 0) {
if (pszValue != NULL) {
int iNeedTLS = atoi(pszValue);
pGw->ulFlags &= ~(SMTP_GWF_USE_TLS | SMTP_GWF_FORCE_TLS);
if (iNeedTLS >= 1)
pGw->ulFlags |= SMTP_GWF_USE_TLS;
if (iNeedTLS == 2)
pGw->ulFlags |= SMTP_GWF_FORCE_TLS;
}
} else if (strcmp(pszName, "OutBind") == 0) {
if (pszValue != NULL) {
SysFree(pGw->pszIFace);
pGw->pszIFace = SysStrDup(pszValue);
}
}
return 0;
}
static int USmtpSetGwOptions(SMTPGateway *pGw, char const *pszOptions)
{
return MscParseOptions(pszOptions, USmtpOptionsAssign, pGw);
}
SMTPGateway **USmtpMakeGateways(char const * const *ppszGwHosts, char const **ppszOptions)
{
int i, iNumGws = StrStringsCount(ppszGwHosts);
SMTPGateway **ppGws;
SMTPGateway GwOpts;
ZeroData(GwOpts);
if (ppszOptions != NULL) {
for (i = 0; ppszOptions[i] != NULL; i++) {
if (USmtpSetGwOptions(&GwOpts, ppszOptions[i]) < 0) {
USmtpCleanupGateway(&GwOpts);
return NULL;
}
}
}
if ((ppGws = (SMTPGateway **)
SysAlloc((iNumGws + 1) * sizeof(SMTPGateway *))) == NULL) {
USmtpCleanupGateway(&GwOpts);
return NULL;
}
for (i = 0; i < iNumGws; i++) {
if ((ppGws[i] = USmtpCloneGateway(&GwOpts, ppszGwHosts[i])) == NULL) {
for (i--; i >= 0; i--)
USmtpFreeGateway(ppGws[i]);
USmtpCleanupGateway(&GwOpts);
SysFree(ppGws);
return NULL;
}
}
ppGws[i] = NULL;
USmtpCleanupGateway(&GwOpts);
return ppGws;
}
void USmtpFreeGateways(SMTPGateway **ppGws)
{
if (ppGws != NULL)
for (int i = 0; ppGws[i] != NULL; i++)
USmtpFreeGateway(ppGws[i]);
SysFree(ppGws);
}
SMTPGateway **USmtpGetCfgGateways(SVRCFG_HANDLE hSvrConfig, char const * const *ppszGwHosts,
char const *pszOptions)
{
int i = 0;
char *pszCfgOptions;
SMTPGateway **ppGws;
char const *pszGwOptions[8];
if ((pszCfgOptions = SvrGetConfigVar(hSvrConfig, "SmtpGwConfig")) != NULL)
pszGwOptions[i++] = pszCfgOptions;
if (pszOptions != NULL)
pszGwOptions[i++] = pszOptions;
pszGwOptions[i] = NULL;
ppGws = USmtpMakeGateways(ppszGwHosts, pszGwOptions);
SysFree(pszCfgOptions);
return ppGws;
}
SMTPGateway **USmtpGetFwdGateways(SVRCFG_HANDLE hSvrConfig, char const *pszDomain)
{
char szFwdFilePath[SYS_MAX_PATH] = "";
USmtpGetFwdTableFilePath(szFwdFilePath, sizeof(szFwdFilePath));
char szResLock[SYS_MAX_PATH] = "";
RLCK_HANDLE hResLock = RLckLockSH(CfgGetBasedPath(szFwdFilePath, szResLock,
sizeof(szResLock)));
if (hResLock == INVALID_RLCK_HANDLE)
return NULL;
FILE *pFwdFile = fopen(szFwdFilePath, "rt");
if (pFwdFile == NULL) {
RLckUnlockSH(hResLock);
ErrSetErrorCode(ERR_SMTPFWD_FILE_NOT_FOUND, szFwdFilePath);
return NULL;
}
char szFwdLine[SMTPFWD_LINE_MAX] = "";
while (MscGetConfigLine(szFwdLine, sizeof(szFwdLine) - 1, pFwdFile) != NULL) {
char **ppszStrings = StrGetTabLineStrings(szFwdLine);
if (ppszStrings == NULL)
continue;
int iFieldsCount = StrStringsCount(ppszStrings);
if (iFieldsCount < fwdOptions) {
/* [i_a] added config file/line sanity check report here */
SysLogMessage(LOG_LEV_DEBUG, "FWDGATEWAYS config error: invalid config line found & skipped: '%s' (error: field count = %d, but should be >= %d\n",
szFwdLine, iFieldsCount, (int)fwdOptions);
}
if (iFieldsCount >= fwdOptions &&
StrIWildMatch(pszDomain, ppszStrings[fwdDomain])) {
char **ppszFwdGws = NULL;
SMTPGateway **ppGws = NULL;
if (ppszStrings[fwdGateway][0] == '#') {
if ((ppszFwdGws =
StrTokenize(ppszStrings[fwdGateway] + 1, ";")) != NULL)
MscRandomizeStringsOrder(ppszFwdGws);
} else
ppszFwdGws = StrTokenize(ppszStrings[fwdGateway], ";");
if (ppszFwdGws != NULL) {
ppGws = USmtpGetCfgGateways(hSvrConfig, ppszFwdGws,
iFieldsCount > fwdOptions ?
ppszStrings[fwdOptions]: NULL);
StrFreeStrings(ppszFwdGws);
}
StrFreeStrings(ppszStrings);
fclose(pFwdFile);
RLckUnlockSH(hResLock);
return ppGws;
}
StrFreeStrings(ppszStrings);
}
fclose(pFwdFile);
RLckUnlockSH(hResLock);
ErrSetErrorCode(ERR_SMTPFWD_NOT_FOUND);
return NULL;
}
static char *USmtpGetRelayFilePath(char *pszRelayFilePath, int iMaxPath)
{
CfgGetRootPath(pszRelayFilePath, iMaxPath);
StrNCat(pszRelayFilePath, SMTP_RELAY_FILE, iMaxPath);
SysLogMessage(LOG_LEV_DEBUG, "Going to look at config file: '%s'\n", pszRelayFilePath);
return pszRelayFilePath;
}
int USmtpGetGateway(SVRCFG_HANDLE hSvrConfig, char const *pszDomain, char *pszGateway,
int iSize)
{
char szGwFilePath[SYS_MAX_PATH] = "";
USmtpGetGwTableFilePath(szGwFilePath, sizeof(szGwFilePath));
char szResLock[SYS_MAX_PATH] = "";
RLCK_HANDLE hResLock = RLckLockSH(CfgGetBasedPath(szGwFilePath, szResLock,
sizeof(szResLock)));
if (hResLock == INVALID_RLCK_HANDLE)
return ErrGetErrorCode();
FILE *pGwFile = fopen(szGwFilePath, "rt");
if (pGwFile == NULL) {
RLckUnlockSH(hResLock);
ErrSetErrorCode(ERR_SMTPGW_FILE_NOT_FOUND, szGwFilePath);
return ERR_SMTPGW_FILE_NOT_FOUND;
}
char szGwLine[SMTPGW_LINE_MAX] = "";
while (MscGetConfigLine(szGwLine, sizeof(szGwLine) - 1, pGwFile) != NULL) {
char **ppszStrings = StrGetTabLineStrings(szGwLine);
if (ppszStrings == NULL)
continue;
int iFieldsCount = StrStringsCount(ppszStrings);
if (iFieldsCount >= gwMax &&
StrIWildMatch(pszDomain, ppszStrings[gwDomain])) {
StrNCpy(pszGateway, ppszStrings[gwGateway], iSize);
StrFreeStrings(ppszStrings);
fclose(pGwFile);
RLckUnlockSH(hResLock);
return 0;
}
StrFreeStrings(ppszStrings);
}
fclose(pGwFile);
RLckUnlockSH(hResLock);
ErrSetErrorCode(ERR_SMTPGW_NOT_FOUND);
return ERR_SMTPGW_NOT_FOUND;
}
static int USmtpWriteGateway(FILE *pGwFile, char const *pszDomain, char const *pszGateway)
{
/* Domain */
char *pszQuoted = StrQuote(pszDomain, '"');
if (pszQuoted == NULL)
return ErrGetErrorCode();
fprintf(pGwFile, "%s\t", pszQuoted);
SysFree(pszQuoted);
/* Gateway */
pszQuoted = StrQuote(pszGateway, '"');
if (pszQuoted == NULL)
return ErrGetErrorCode();
fprintf(pGwFile, "%s\n", pszQuoted);
SysFree(pszQuoted);
return 0;
}
int USmtpAddGateway(char const *pszDomain, char const *pszGateway)
{
char szGwFilePath[SYS_MAX_PATH] = "";
USmtpGetGwTableFilePath(szGwFilePath, sizeof(szGwFilePath));
char szResLock[SYS_MAX_PATH] = "";
RLCK_HANDLE hResLock = RLckLockEX(CfgGetBasedPath(szGwFilePath, szResLock,
sizeof(szResLock)));
if (hResLock == INVALID_RLCK_HANDLE)
return ErrGetErrorCode();
FILE *pGwFile = fopen(szGwFilePath, "r+t");
if (pGwFile == NULL) {
RLckUnlockEX(hResLock);
ErrSetErrorCode(ERR_SMTPGW_FILE_NOT_FOUND, szGwFilePath);
return ERR_SMTPGW_FILE_NOT_FOUND;
}
char szGwLine[SMTPGW_LINE_MAX] = "";
while (MscGetConfigLine(szGwLine, sizeof(szGwLine) - 1, pGwFile) != NULL) {
char **ppszStrings = StrGetTabLineStrings(szGwLine);
if (ppszStrings == NULL)
continue;
int iFieldsCount = StrStringsCount(ppszStrings);
if (iFieldsCount >= gwMax && stricmp(pszDomain, ppszStrings[gwDomain]) == 0 &&
stricmp(pszGateway, ppszStrings[gwGateway]) == 0) {
StrFreeStrings(ppszStrings);
fclose(pGwFile);
RLckUnlockEX(hResLock);
ErrSetErrorCode(ERR_GATEWAY_ALREADY_EXIST);
return ERR_GATEWAY_ALREADY_EXIST;
}
StrFreeStrings(ppszStrings);
}
fseek(pGwFile, 0, SEEK_END);
if (USmtpWriteGateway(pGwFile, pszDomain, pszGateway) < 0) {
fclose(pGwFile);
RLckUnlockEX(hResLock);
return ErrGetErrorCode();
}
fclose(pGwFile);
RLckUnlockEX(hResLock);
return 0;
}
int USmtpRemoveGateway(char const *pszDomain)
{
char szGwFilePath[SYS_MAX_PATH] = "";
char szTmpFile[SYS_MAX_PATH] = "";
USmtpGetGwTableFilePath(szGwFilePath, sizeof(szGwFilePath));
UsrGetTmpFile(NULL, szTmpFile, sizeof(szTmpFile));
char szResLock[SYS_MAX_PATH] = "";
RLCK_HANDLE hResLock = RLckLockEX(CfgGetBasedPath(szGwFilePath, szResLock,
sizeof(szResLock)));
if (hResLock == INVALID_RLCK_HANDLE)
return ErrGetErrorCode();
FILE *pGwFile = fopen(szGwFilePath, "rt");
if (pGwFile == NULL) {
RLckUnlockEX(hResLock);
ErrSetErrorCode(ERR_SMTPGW_FILE_NOT_FOUND, szGwFilePath);
return ERR_SMTPGW_FILE_NOT_FOUND;
}
FILE *pTmpFile = fopen(szTmpFile, "wt");
if (pTmpFile == NULL) {
fclose(pGwFile);
RLckUnlockEX(hResLock);
ErrSetErrorCode(ERR_FILE_CREATE, szTmpFile); /* [i_a] */
return ERR_FILE_CREATE;
}
int iGatewayFound = 0;
char szGwLine[SMTPGW_LINE_MAX] = "";
while (MscFGets(szGwLine, sizeof(szGwLine) - 1, pGwFile) != NULL) { /* [i_a] fix bug for processing empty lines */
if (szGwLine[0] == TAB_COMMENT_CHAR) {
fprintf(pTmpFile, "%s\n", szGwLine);
continue;
}
char **ppszStrings = StrGetTabLineStrings(szGwLine);
if (ppszStrings == NULL) {
fprintf(pTmpFile, "%s\n", szGwLine);
continue;
}
int iFieldsCount = StrStringsCount(ppszStrings);
if (iFieldsCount >= gwMax &&
stricmp(pszDomain, ppszStrings[gwDomain]) == 0) {
++iGatewayFound;
} else
fprintf(pTmpFile, "%s\n", szGwLine);
StrFreeStrings(ppszStrings);
}
fclose(pGwFile);
fclose(pTmpFile);
if (iGatewayFound == 0) {
SysRemove(szTmpFile);
RLckUnlockEX(hResLock);
ErrSetErrorCode(ERR_GATEWAY_NOT_FOUND);
return ERR_GATEWAY_NOT_FOUND;
}
if (MscMoveFile(szTmpFile, szGwFilePath) < 0) {
ErrorPush();
RLckUnlockEX(hResLock);
return ErrorPop();
}
RLckUnlockEX(hResLock);
return 0;
}
int USmtpIsAllowedRelay(const SYS_INET_ADDR &PeerInfo, SVRCFG_HANDLE hSvrConfig)
{
char szRelayFilePath[SYS_MAX_PATH] = "";
USmtpGetRelayFilePath(szRelayFilePath, sizeof(szRelayFilePath));
char szResLock[SYS_MAX_PATH] = "";
RLCK_HANDLE hResLock = RLckLockSH(CfgGetBasedPath(szRelayFilePath, szResLock,
sizeof(szResLock)));
if (hResLock == INVALID_RLCK_HANDLE)
return ErrGetErrorCode();
FILE *pRelayFile = fopen(szRelayFilePath, "rt");
if (pRelayFile == NULL) {
RLckUnlockSH(hResLock);
ErrSetErrorCode(ERR_SMTPRELAY_FILE_NOT_FOUND, szRelayFilePath);
return ERR_SMTPRELAY_FILE_NOT_FOUND;
}
char szRelayLine[SMTPRELAY_LINE_MAX] = "";
while (MscGetConfigLine(szRelayLine, sizeof(szRelayLine) - 1, pRelayFile) != NULL) {
char **ppszStrings = StrGetTabLineStrings(szRelayLine);
if (ppszStrings == NULL)
continue;
int iFieldsCount = StrStringsCount(ppszStrings);
AddressFilter AF;
if (iFieldsCount > 0 &&
MscLoadAddressFilter(ppszStrings, iFieldsCount, AF) == 0 &&
MscAddressMatch(AF, PeerInfo)) {
StrFreeStrings(ppszStrings);
fclose(pRelayFile);
RLckUnlockSH(hResLock);
return 0;
}
StrFreeStrings(ppszStrings);
}
fclose(pRelayFile);
RLckUnlockSH(hResLock);
ErrSetErrorCode(ERR_RELAY_NOT_ALLOWED);
return ERR_RELAY_NOT_ALLOWED;
}
char **USmtpGetPathStrings(char const *pszMailCmd)
{
char const *pszOpen, *pszClose;
if ((pszOpen = strchr(pszMailCmd, '<')) == NULL ||
(pszClose = strchr(pszOpen + 1, '>')) == NULL) {
ErrSetErrorCode(ERR_SMTP_PATH_PARSE_ERROR);
return NULL;
}
int iPathLength = (int) (pszClose - pszOpen) - 1;
if (iPathLength >= MAX_SMTP_ADDRESS) {
ErrSetErrorCode(ERR_SMTP_PATH_PARSE_ERROR, pszMailCmd);
return NULL;
}
/*
* USmlValidAddress() will fail with an empty address, but
* USmtpGetPathStrings() should succeed anyway (returning an empty
* recipient path array), so we check for length before calling
* USmlValidAddress().
*/
if (iPathLength > 0 && USmlValidAddress(pszOpen + 1, pszClose) < 0)
return NULL;
char *pszPath = (char *) SysAlloc(iPathLength + 1);
if (pszPath == NULL)
return NULL;
Cpy2Sz(pszPath, pszOpen + 1, iPathLength);
char **ppszDomains = StrTokenize(pszPath, ",:");
SysFree(pszPath);
return ppszDomains;
}
int USmtpSplitEmailAddr(char const *pszAddr, char *pszUser, char *pszDomain)
{
if (USmlValidAddress(pszAddr, pszAddr + strlen(pszAddr)) < 0)
return ErrGetErrorCode();
/*
[i_a] '@' is also accepted in the section before the '<email-address>', e.g.
"loony@toones <[email protected]>"
Besides, this code must be able to handle lines like
'from bla <[email protected]>; via blub ([email protected]); etc.'
*/
char const *lt_p = strchr(pszAddr, '<');
char const *gt_p = (!lt_p ? lt_p : strchr(lt_p + 1, '>'));
char const *pszAT = strchr(lt_p ? lt_p + 1 : pszAddr, '@');
while (lt_p && gt_p && pszAT) {
if (pszAT > gt_p) {
lt_p = strchr(lt_p + 1, '<');
gt_p = (!lt_p ? lt_p : strchr(lt_p + 1, '>'));
pszAT = (!lt_p ? /* copout for bad line */ strchr(pszAddr, '@') : strchr(lt_p + 1, '@'));
}
else {
break;
}
}
if (pszAT == NULL) {
ErrSetErrorCode(ERR_BAD_EMAIL_ADDR);
return ERR_BAD_EMAIL_ADDR;
}
int iUserLength = (int) (pszAT - pszAddr);
int iDomainLength = (int)strlen(pszAT + 1);
if (pszUser != NULL) {
if (iUserLength == 0) {
ErrSetErrorCode(ERR_BAD_EMAIL_ADDR);
return ERR_BAD_EMAIL_ADDR;
}
iUserLength = Min(iUserLength, MAX_ADDR_NAME - 1);
Cpy2Sz(pszUser, pszAddr, iUserLength);
}
if (pszDomain != NULL) {
if (iDomainLength == 0) {
ErrSetErrorCode(ERR_BAD_EMAIL_ADDR);
return ERR_BAD_EMAIL_ADDR;
}
StrNCpy(pszDomain, pszAT + 1, MAX_ADDR_NAME);
}
return 0;
}
int USmtpCheckAddressPart(char const *pszName)
{
char const *pszTop = pszName + strlen(pszName);
if (USmlDotAtom(pszName, pszTop) != pszTop) {
ErrSetErrorCode(ERR_BAD_RFCNAME);
return ERR_BAD_RFCNAME;
}
return 0;
}
int USmtpCheckDomainPart(char const *pszName)
{
return USmlValidHost(pszName, pszName + strlen(pszName));
}
int USmtpCheckAddress(char const *pszAddress)
{
char szUser[MAX_ADDR_NAME] = "";
char szDomain[MAX_ADDR_NAME] = "";
if (USmtpSplitEmailAddr(pszAddress, szUser, szDomain) < 0 ||
USmtpCheckAddressPart(szUser) < 0 ||
USmtpCheckDomainPart(szDomain) < 0)
return ErrGetErrorCode();
return 0;
}
int USmtpInitError(SMTPError *pSMTPE)
{
ZeroData(*pSMTPE);
pSMTPE->iSTMPResponse = 0;
pSMTPE->pszSTMPResponse = NULL;
pSMTPE->pszServer = NULL;
return 0;
}
int USmtpSetError(SMTPError *pSMTPE, int iSTMPResponse, char const *pszSTMPResponse,
char const *pszServer)
{
pSMTPE->iSTMPResponse = iSTMPResponse;
SysFree(pSMTPE->pszSTMPResponse);
SysFree(pSMTPE->pszServer);
pSMTPE->pszSTMPResponse = SysStrDup(pszSTMPResponse);
pSMTPE->pszServer = SysStrDup(pszServer);
return 0;
}
static int USmtpSetErrorServer(SMTPError *pSMTPE, char const *pszServer)
{
SysFree(pSMTPE->pszServer);
pSMTPE->pszServer = SysStrDup(pszServer);
return 0;
}
bool USmtpIsFatalError(SMTPError const *pSMTPE)
{
return (pSMTPE->iSTMPResponse == SMTP_FATAL_ERROR ||
(pSMTPE->iSTMPResponse >= 500 && pSMTPE->iSTMPResponse < 600));
}
char const *USmtpGetErrorMessage(SMTPError const *pSMTPE)
{
return (pSMTPE->pszSTMPResponse != NULL) ? pSMTPE->pszSTMPResponse: "";
}
int USmtpCleanupError(SMTPError *pSMTPE)
{
SysFree(pSMTPE->pszSTMPResponse);
SysFree(pSMTPE->pszServer);
USmtpInitError(pSMTPE);
return 0;
}
char *USmtpGetSMTPError(SMTPError *pSMTPE, char *pszError, int iMaxError)
{
char const *pszSmtpErr = (pSMTPE != NULL) ?
USmtpGetErrorMessage(pSMTPE): DEFAULT_SMTP_ERR;
if (IsEmptyString(pszSmtpErr))
pszSmtpErr = DEFAULT_SMTP_ERR;
StrNCpy(pszError, pszSmtpErr, iMaxError);
return pszError;
}
char *USmtpGetSMTPRmtMsgID(char const *pszAckDATA, char *pszRmtMsgID, int iMaxMsg)
{
int iRmtMsgLen;
char const *pszTmp;
for (; isdigit(*pszAckDATA); pszAckDATA++);
for (; isspace(*pszAckDATA); pszAckDATA++);
if ((pszTmp = strchr(pszAckDATA, '<')) != NULL) {
pszAckDATA = pszTmp + 1;
if ((pszTmp = strchr(pszAckDATA, '>')) == NULL)
iRmtMsgLen = (int)strlen(pszAckDATA);
else
iRmtMsgLen = (int) (pszTmp - pszAckDATA);
} else
iRmtMsgLen = (int)strlen(pszAckDATA);
iRmtMsgLen = Min(iRmtMsgLen, iMaxMsg - 1);
Cpy2Sz(pszRmtMsgID, pszAckDATA, iRmtMsgLen);
return pszRmtMsgID;
}
char const *USmtpGetErrorServer(SMTPError const *pSMTPE)
{
return (pSMTPE->pszServer != NULL) ? pSMTPE->pszServer: "";
}
static int USmtpResponseClass(int iResponseCode, int iResponseClass)
{
return ((iResponseCode >= iResponseClass &&
iResponseCode < (iResponseClass + 100)) ? 1: 0);
}
static int USmtpGetResultCode(char const *pszResult)
{
int i;
char szResCode[64] = "";
for (i = 0; (i < sizeof(szResCode)) && isdigit(pszResult[i]); i++)
szResCode[i] = pszResult[i];
if (i == 0 || i == sizeof(szResCode)) {
ErrSetErrorCode(ERR_BAD_SMTP_RESPONSE);
return ERR_BAD_SMTP_RESPONSE;
}
szResCode[i] = '\0';
return atoi(szResCode);
}
static int USmtpIsPartialResponse(char const *pszResponse)
{
return (strlen(pszResponse) >= 4 && pszResponse[3] == '-') ? 1: 0;
}
static int USmtpGetResponse(BSOCK_HANDLE hBSock, char *pszResponse, int iMaxResponse,
int iTimeout)
{
int iResultCode = -1;
int iResponseLenght = 0;
char szPartial[1024] = "";
SetEmptyString(pszResponse);
do {
int iLineLength = 0;
if (BSckGetString(hBSock, szPartial, sizeof(szPartial) - 1, iTimeout,
&iLineLength) == NULL)
return ErrGetErrorCode();
if ((iResponseLenght + 2) < iMaxResponse) {
if (iResponseLenght > 0)
strcat(pszResponse, "\r\n"), iResponseLenght += 2;
int iCopyLenght = Min(iMaxResponse - 1 - iResponseLenght, iLineLength);
if (iCopyLenght > 0) {
strncpy(pszResponse + iResponseLenght, szPartial, iCopyLenght);
iResponseLenght += iCopyLenght;
pszResponse[iResponseLenght] = '\0';
}
}
if ((iResultCode = USmtpGetResultCode(szPartial)) < 0)
return ErrGetErrorCode();
} while (USmtpIsPartialResponse(szPartial));
return iResultCode;
}
static int USmtpSendCommand(BSOCK_HANDLE hBSock, char const *pszCommand,
char *pszResponse, int iMaxResponse, int iTimeout)
{
if (BSckSendString(hBSock, pszCommand, iTimeout) <= 0)
return ErrGetErrorCode();
return USmtpGetResponse(hBSock, pszResponse, iMaxResponse, iTimeout);
}
static int USmtpGetServerAuthFile(char const *pszServer, char *pszAuthFilePath)
{
int iRootedName = MscRootedName(pszServer);
char szAuthPath[SYS_MAX_PATH] = "";
UAthGetRootPath(AUTH_SERVICE_SMTP, szAuthPath, sizeof(szAuthPath));
char const *pszDot = pszServer;
while (pszDot != NULL && strlen(pszDot) > 0) {
if (iRootedName)
sprintf(pszAuthFilePath, "%s%stab", szAuthPath, pszDot);
else
sprintf(pszAuthFilePath, "%s%s.tab", szAuthPath, pszDot);
if (SysExistFile(pszAuthFilePath))
return 0;
if ((pszDot = strchr(pszDot, '.')) != NULL)
++pszDot;
}
ErrSetErrorCode(ERR_NO_SMTP_AUTH_CONFIG);
return ERR_NO_SMTP_AUTH_CONFIG;
}
static int USmtpDoPlainAuth(SmtpChannel *pSmtpCh, char const *pszServer,
char const *const *ppszAuthTokens, SMTPError *pSMTPE)
{
if (StrStringsCount(ppszAuthTokens) < 3) {
ErrSetErrorCode(ERR_BAD_SMTP_AUTH_CONFIG);
return ERR_BAD_SMTP_AUTH_CONFIG;
}
/* Build plain text authentication token ( "\0" Username "\0" Password "\0" ) */
int iAuthLength = 1;
char szAuthBuffer[2048] = "";
strcpy(szAuthBuffer + iAuthLength, ppszAuthTokens[1]);
iAuthLength += (int)strlen(ppszAuthTokens[1]) + 1;
strcpy(szAuthBuffer + iAuthLength, ppszAuthTokens[2]);
iAuthLength += (int)strlen(ppszAuthTokens[2]);
int iEnc64Length;
char szEnc64Token[1024] = "";
iEnc64Length = sizeof(szEnc64Token) - 1;
Base64Encode(szAuthBuffer, iAuthLength, szEnc64Token, &iEnc64Length);
/* Send AUTH command */
int iSvrReponse;
SysSNPrintf(szAuthBuffer, sizeof(szAuthBuffer) - 1, "AUTH PLAIN %s", szEnc64Token);
if (!USmtpResponseClass(iSvrReponse = USmtpSendCommand(pSmtpCh->hBSock, szAuthBuffer,
szAuthBuffer,
sizeof(szAuthBuffer) - 1), 200)) {
if (iSvrReponse > 0) {
if (pSMTPE != NULL)
USmtpSetError(pSMTPE, iSvrReponse, szAuthBuffer,
pSmtpCh->pszServer);
ErrSetErrorCode(ERR_BAD_SERVER_RESPONSE, szAuthBuffer);
}
return ErrGetErrorCode();
}
return 0;
}
static int USmtpDoLoginAuth(SmtpChannel *pSmtpCh, char const *pszServer,
char const *const *ppszAuthTokens, SMTPError *pSMTPE)
{
if (StrStringsCount(ppszAuthTokens) < 3) {
ErrSetErrorCode(ERR_BAD_SMTP_AUTH_CONFIG);
return ERR_BAD_SMTP_AUTH_CONFIG;
}
/* Send AUTH command */
int iSvrReponse;
char szAuthBuffer[1024] = "";
sprintf(szAuthBuffer, "AUTH LOGIN");
if (!USmtpResponseClass(iSvrReponse = USmtpSendCommand(pSmtpCh->hBSock, szAuthBuffer,
szAuthBuffer,
sizeof(szAuthBuffer) - 1), 300)) {
if (iSvrReponse > 0) {
if (pSMTPE != NULL)
USmtpSetError(pSMTPE, iSvrReponse, szAuthBuffer,
pSmtpCh->pszServer);
ErrSetErrorCode(ERR_BAD_SERVER_RESPONSE, szAuthBuffer);
}
return ErrGetErrorCode();
}
/* Send username */
int iEnc64Length = sizeof(szAuthBuffer) - 1;
Base64Encode(ppszAuthTokens[1], (int)strlen(ppszAuthTokens[1]), szAuthBuffer, &iEnc64Length);
if (!USmtpResponseClass(iSvrReponse = USmtpSendCommand(pSmtpCh->hBSock, szAuthBuffer,
szAuthBuffer,
sizeof(szAuthBuffer) - 1), 300)) {
if (iSvrReponse > 0) {
if (pSMTPE != NULL)
USmtpSetError(pSMTPE, iSvrReponse, szAuthBuffer,
pSmtpCh->pszServer);
ErrSetErrorCode(ERR_BAD_SERVER_RESPONSE, szAuthBuffer);
}
return ErrGetErrorCode();
}
/* Send password */
iEnc64Length = sizeof(szAuthBuffer) - 1;
Base64Encode(ppszAuthTokens[2], (int)strlen(ppszAuthTokens[2]), szAuthBuffer, &iEnc64Length);
if (!USmtpResponseClass(iSvrReponse = USmtpSendCommand(pSmtpCh->hBSock, szAuthBuffer,
szAuthBuffer,
sizeof(szAuthBuffer) - 1), 200)) {
if (iSvrReponse > 0) {