* Exim - an Internet mail transport agent *
*************************************************/
-/* Copyright (c) Wolfgang Breyha 2005-2009
+/* Copyright (c) Wolfgang Breyha 2005 - 2019
* Vienna University Computer Center
* wbreyha@gmx.net
* See the file NOTICE for conditions of use and distribution.
+ *
+ * Copyright (c) The Exim Maintainers 2015 - 2022
+ * SPDX-License-Identifier: GPL-2.0-or-later
*/
-/* This patch is based on code from Tom Kistners exiscan (ACL integration) and
- * the DCC local_scan patch from Christopher Bodenstein */
-
/* Code for calling dccifd. Called from acl.c. */
#include "exim.h"
#ifdef EXPERIMENTAL_DCC
+#ifndef WITH_CONTENT_SCAN
+# error EXPERIMENTAL_DCC requires WITH_CONTENT_SCAN
+#endif
+
#include "dcc.h"
#include "unistd.h"
-uschar dcc_header_str[256];
-uschar dcc_result_str[256];
+#define DCC_HEADER_LIMIT 120
+
int dcc_ok = 0;
int dcc_rc = 0;
/* This function takes a file descriptor and a buffer as input and
- * returns either 0 for success or errno in case of error. */
+returns either 0 for success or errno in case of error. */
-int flushbuffer (int socket, uschar *buffer)
- {
- int retval, rsp;
- rsp = write(socket, buffer, Ustrlen(buffer));
- DEBUG(D_acl)
- debug_printf("Result of the write() = %d\n", rsp);
- if(rsp < 0)
+static int flushbuffer
+(int socket, gstring *buffer)
+{
+int rsp;
+
+rsp = write(socket, buffer->s, buffer->ptr);
+DEBUG(D_acl)
+ debug_printf("DCC: flushbuffer(): Result of the write() = %d\n", rsp);
+if(rsp < 0)
{
- DEBUG(D_acl)
- debug_printf("Error writing buffer to socket: %s\n", strerror(errno));
- retval = errno;
- } else {
- DEBUG(D_acl)
- debug_printf("Wrote buffer to socket:\n%s\n", buffer);
- retval = 0;
+ DEBUG(D_acl)
+ debug_printf("DCC: flushbuffer(): Error writing buffer to socket: %s\n", strerror(errno));
+ return errno;
}
- return retval;
+DEBUG(D_acl)
+ debug_printf("DCC: flushbuffer(): Wrote buffer to socket:\n%.*s\n", buffer->ptr, buffer->s);
+return 0;
}
-int dcc_process(uschar **listptr) {
- int sep = 0;
- uschar *list = *listptr;
- FILE *data_file;
- uschar *dcc_daemon_ip = US"";
- uschar *dcc_default_ip_option = US"127.0.0.1";
- uschar *dcc_ip_option = US"";
- uschar *dcc_helo_option = US"localhost";
- uschar *dcc_reject_message = US"Rejected by DCC";
- uschar *xtra_hdrs = NULL;
-
- /* from local_scan */
- int i, j, k, c, retval, sockfd, resp, line;
- unsigned int portnr;
- struct sockaddr_un serv_addr;
- struct sockaddr_in serv_addr_in;
- struct hostent *ipaddress;
- uschar sockpath[128];
- uschar sockip[40], client_ip[40];
- uschar opts[128];
- uschar rcpt[128], from[128];
- uschar sendbuf[4096];
- uschar recvbuf[4096];
- uschar xhdr[256];
- uschar dcc_return_text[1024];
- uschar mbox_path[1024];
- uschar message_subdir[2];
- struct header_line *dcchdr;
- uschar *dcc_acl_options;
- uschar dcc_acl_options_buffer[10];
- uschar dcc_xtra_hdrs[1024];
-
- /* grep 1st option */
- if ((dcc_acl_options = string_nextinlist(&list, &sep,
- dcc_acl_options_buffer,
- sizeof(dcc_acl_options_buffer))) != NULL)
+int
+dcc_process(uschar **listptr)
+{
+int sep = 0;
+const uschar *list = *listptr;
+FILE *data_file;
+uschar *dcc_default_ip_option = US"127.0.0.1";
+uschar *dcc_helo_option = US"localhost";
+uschar *xtra_hdrs = NULL;
+uschar *override_client_ip = NULL;
+
+/* from local_scan */
+int dcc_resplen, retval, sockfd, resp;
+unsigned int portnr;
+struct sockaddr_un serv_addr;
+struct sockaddr_in serv_addr_in;
+struct hostent *ipaddress;
+uschar sockpath[128];
+uschar sockip[40], client_ip[40];
+gstring *dcc_headers;
+gstring *sendbuf;
+uschar *dcc_return_text = US"''";
+struct header_line *mail_headers;
+uschar *dcc_acl_options;
+gstring *dcc_xtra_hdrs;
+gstring *dcc_header_str;
+
+/* grep 1st option */
+if ((dcc_acl_options = string_nextinlist(&list, &sep, NULL, 0)))
{
- /* parse 1st option */
- if ( (strcmpic(dcc_acl_options,US"false") == 0) ||
- (Ustrcmp(dcc_acl_options,"0") == 0) ) {
- /* explicitly no matching */
- return FAIL;
- };
-
- /* special cases (match anything except empty) */
- if ( (strcmpic(dcc_acl_options,US"true") == 0) ||
- (Ustrcmp(dcc_acl_options,"*") == 0) ||
- (Ustrcmp(dcc_acl_options,"1") == 0) ) {
- dcc_acl_options = dcc_acl_options;
- };
+ /* parse 1st option */
+ if ( strcmpic(dcc_acl_options, US"false") == 0
+ || Ustrcmp(dcc_acl_options, "0") == 0)
+ return FAIL; /* explicitly no matching */
}
- else {
- /* empty means "don't match anything" */
- return FAIL;
- };
-
- sep = 0;
-
- /* if we scanned this message last time, just return */
- if ( dcc_ok )
- return dcc_rc;
-
- /* open the spooled body */
- message_subdir[1] = '\0';
- for (i = 0; i < 2; i++) {
- message_subdir[0] = (split_spool_directory == (i == 0))? message_id[5] : 0;
- sprintf(CS mbox_path, "%s/input/%s/%s-D", spool_directory, message_subdir, message_id);
- data_file = Ufopen(mbox_path,"rb");
- if (data_file != NULL)
- break;
- };
-
- if (data_file == NULL) {
- /* error while spooling */
- log_write(0, LOG_MAIN|LOG_PANIC,
- "dcc acl condition: error while opening spool file");
- return DEFER;
- };
-
- /* Initialize the variables */
-
- bzero(sockip,sizeof(sockip));
- if (dccifd_address) {
- if (dccifd_address[0] == '/')
- Ustrncpy(sockpath, dccifd_address, sizeof(sockpath));
- else
- if( sscanf(CS dccifd_address, "%s %u", sockip, &portnr) != 2) {
- log_write(0, LOG_MAIN,
- "dcc acl condition: warning - invalid dccifd address: '%s'", dccifd_address);
- (void)fclose(data_file);
- return DEFER;
- }
+else
+ return FAIL; /* empty means "don't match anything" */
+
+sep = 0;
+
+/* if we scanned this message last time, just return */
+if (dcc_ok)
+ return dcc_rc;
+
+/* open the spooled body */
+for (int i = 0; i < 2; i++)
+ {
+ uschar message_subdir[2];
+ set_subdir_str(message_subdir, message_id, i);
+ if ((data_file = Ufopen(
+ spool_fname(US"input", message_subdir, message_id, US"-D"), "rb")))
+ break;
}
- /* opts is what we send as dccifd options - see man dccifd */
- /* We don't support any other option than 'header' so just copy that */
- bzero(opts,sizeof(opts));
- Ustrncpy(opts, "header", sizeof(opts)-1);
- Ustrncpy(client_ip, dcc_ip_option, sizeof(client_ip)-1);
- /* If the dcc_client_ip is not provided use the
- * sender_host_address or 127.0.0.1 if it is NULL */
- DEBUG(D_acl)
- debug_printf("my_ip_option = %s - client_ip = %s - sender_host_address = %s\n", dcc_ip_option, client_ip, sender_host_address);
- if(!(Ustrcmp(client_ip, ""))){
- /* Do we have a sender_host_address or is it NULL? */
- if(sender_host_address){
- Ustrncpy(client_ip, sender_host_address, sizeof(client_ip)-1);
- } else {
- /* sender_host_address is NULL which means it comes from localhost */
- Ustrncpy(client_ip, dcc_default_ip_option, sizeof(client_ip)-1);
- }
+if (!data_file)
+ {
+ /* error while spooling */
+ log_write(0, LOG_MAIN|LOG_PANIC,
+ "DCC: error while opening spool file");
+ return DEFER;
}
- DEBUG(D_acl)
- debug_printf("Client IP: %s\n", client_ip);
- Ustrncpy(sockip, dcc_daemon_ip, sizeof(sockip)-1);
- /* strncat(opts, my_request, strlen(my_request)); */
- Ustrcat(opts, "\n");
- Ustrncat(opts, client_ip, sizeof(opts)-Ustrlen(opts)-1);
- Ustrncat(opts, "\nHELO ", sizeof(opts)-Ustrlen(opts)-1);
- Ustrncat(opts, dcc_helo_option, sizeof(opts)-Ustrlen(opts)-2);
- Ustrcat(opts, "\n");
-
- /* initialize the other variables */
- dcchdr = header_list;
- /* we set the default return value to DEFER */
- retval = DEFER;
-
- bzero(sendbuf,sizeof(sendbuf));
- bzero(xhdr,sizeof(xhdr));
- bzero(rcpt,sizeof(rcpt));
- bzero(from,sizeof(from));
-
- /* send a null return path as "<>". */
- if (Ustrlen(sender_address) > 0)
- Ustrncpy(from, sender_address, sizeof(from));
+
+/* Initialize the variables */
+
+bzero(sockip,sizeof(sockip));
+if (dccifd_address)
+ {
+ if (dccifd_address[0] == '/')
+ Ustrncpy(sockpath, dccifd_address, sizeof(sockpath));
else
- Ustrncpy(from, "<>", sizeof(from));
- Ustrncat(from, "\n", sizeof(from)-Ustrlen(from)-1);
-
- /**************************************
- * Now creating the socket connection *
- **************************************/
-
- /* If there is a dcc_daemon_ip, we use a tcp socket, otherwise a UNIX socket */
- if(Ustrcmp(sockip, "")){
- ipaddress = gethostbyname((char *)sockip);
- bzero((char *) &serv_addr_in, sizeof(serv_addr_in));
- serv_addr_in.sin_family = AF_INET;
- bcopy((char *)ipaddress->h_addr, (char *)&serv_addr_in.sin_addr.s_addr, ipaddress->h_length);
- serv_addr_in.sin_port = htons(portnr);
- if ((sockfd = socket(AF_INET, SOCK_STREAM,0)) < 0){
- DEBUG(D_acl)
- debug_printf("Creating socket failed: %s\n", strerror(errno));
- log_write(0,LOG_REJECT,"Creating socket failed: %s\n", strerror(errno));
- /* if we cannot create the socket, defer the mail */
- (void)fclose(data_file);
- return retval;
- }
- /* Now connecting the socket (INET) */
- if (connect(sockfd, (struct sockaddr *)&serv_addr_in, sizeof(serv_addr_in)) < 0){
- DEBUG(D_acl)
- debug_printf("Connecting socket failed: %s\n", strerror(errno));
- log_write(0,LOG_REJECT,"Connecting socket failed: %s\n", strerror(errno));
- /* if we cannot contact the socket, defer the mail */
+ if( sscanf(CS dccifd_address, "%s %u", sockip, &portnr) != 2)
+ {
+ log_write(0, LOG_MAIN,
+ "DCC: warning - invalid dccifd address: '%s'", dccifd_address);
(void)fclose(data_file);
- return retval;
- }
- } else {
- /* connecting to the dccifd UNIX socket */
- bzero((char *)&serv_addr,sizeof(serv_addr));
- serv_addr.sun_family = AF_UNIX;
- Ustrcpy(serv_addr.sun_path, sockpath);
- if ((sockfd = socket(AF_UNIX, SOCK_STREAM,0)) < 0){
- DEBUG(D_acl)
- debug_printf("Creating socket failed: %s\n", strerror(errno));
- log_write(0,LOG_REJECT,"Creating socket failed: %s\n", strerror(errno));
- /* if we cannot create the socket, defer the mail */
- (void)fclose(data_file);
- return retval;
- }
- /* Now connecting the socket (UNIX) */
- if (connect(sockfd, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) < 0){
- DEBUG(D_acl)
- debug_printf("Connecting socket failed: %s\n", strerror(errno));
- log_write(0,LOG_REJECT,"Connecting socket failed: %s\n", strerror(errno));
- /* if we cannot contact the socket, defer the mail */
- (void)fclose(data_file);
- return retval;
- }
+ return DEFER;
+ }
}
- /* the socket is open, now send the options to dccifd*/
- DEBUG(D_acl)
- debug_printf("\n---------------------------\nSocket opened; now sending input\n-----------------\n");
- /* First, fill in the input buffer */
- Ustrncpy(sendbuf, opts, sizeof(sendbuf));
- Ustrncat(sendbuf, from, sizeof(sendbuf)-Ustrlen(sendbuf)-1);
+/* dcc_headers is what we send as dccifd options - see man dccifd */
+/* We don't support any other option than 'header' so just copy that */
+dcc_headers = string_cat(NULL, dccifd_options);
+/* if $acl_m_dcc_override_client_ip is set use it */
+if (((override_client_ip = expand_string(US"$acl_m_dcc_override_client_ip")) != NULL) &&
+ (override_client_ip[0] != '\0'))
+ {
+ Ustrncpy(client_ip, override_client_ip, sizeof(client_ip)-1);
DEBUG(D_acl)
+ debug_printf("DCC: Client IP (overridden): %s\n", client_ip);
+ }
+else if(sender_host_address)
{
- debug_printf("opts = %s\nsender = %s\nrcpt count = %d\n", opts, from, recipients_count);
- debug_printf("Sending options:\n****************************\n");
+ /* else if $sender_host_address is available use that? */
+ Ustrncpy(client_ip, sender_host_address, sizeof(client_ip)-1);
+ DEBUG(D_acl)
+ debug_printf("DCC: Client IP (sender_host_address): %s\n", client_ip);
}
+else
+ {
+ /* sender_host_address is NULL which means it comes from localhost */
+ Ustrncpy(client_ip, dcc_default_ip_option, sizeof(client_ip)-1);
+ DEBUG(D_acl)
+ debug_printf("DCC: Client IP (default): %s\n", client_ip);
+ }
+/* build options block */
+dcc_headers = string_append(dcc_headers, 5, US"\n", client_ip, US"\nHELO ", dcc_helo_option, US"\n");
+
+/* initialize the other variables */
+mail_headers = header_list;
+/* we set the default return value to DEFER */
+retval = DEFER;
- /* let's send each of the recipients to dccifd */
- for (i = 0; i < recipients_count; i++){
+/* send a null return path as "<>". */
+dcc_headers = string_cat (dcc_headers, *sender_address ? sender_address : US"<>");
+dcc_headers = string_catn(dcc_headers, US"\n", 1);
+
+/**************************************
+ * Now creating the socket connection *
+ **************************************/
+
+/* If sockip contains an ip, we use a tcp socket, otherwise a UNIX socket */
+if(Ustrcmp(sockip, ""))
+ {
+ ipaddress = gethostbyname(CS sockip);
+ bzero(CS &serv_addr_in, sizeof(serv_addr_in));
+ serv_addr_in.sin_family = AF_INET;
+ bcopy(CS ipaddress->h_addr, CS &serv_addr_in.sin_addr.s_addr, ipaddress->h_length);
+ serv_addr_in.sin_port = htons(portnr);
+ if ((sockfd = socket(AF_INET, SOCK_STREAM,0)) < 0)
+ {
DEBUG(D_acl)
- debug_printf("recipient = %s\n",recipients_list[i].address);
- if(Ustrlen(sendbuf) + Ustrlen(recipients_list[i].address) > sizeof(sendbuf))
+ debug_printf("DCC: Creating TCP socket connection failed: %s\n", strerror(errno));
+ log_write(0,LOG_PANIC,"DCC: Creating TCP socket connection failed: %s\n", strerror(errno));
+ /* if we cannot create the socket, defer the mail */
+ (void)fclose(data_file);
+ return retval;
+ }
+ /* Now connecting the socket (INET) */
+ if (connect(sockfd, (struct sockaddr *)&serv_addr_in, sizeof(serv_addr_in)) < 0)
{
- DEBUG(D_acl)
- debug_printf("Writing buffer: %s\n", sendbuf);
- flushbuffer(sockfd, sendbuf);
- bzero(sendbuf, sizeof(sendbuf));
+ DEBUG(D_acl)
+ debug_printf("DCC: Connecting to TCP socket failed: %s\n", strerror(errno));
+ log_write(0,LOG_PANIC,"DCC: Connecting to TCP socket failed: %s\n", strerror(errno));
+ /* if we cannot contact the socket, defer the mail */
+ (void)fclose(data_file);
+ return retval;
}
- Ustrncat(sendbuf, recipients_list[i].address, sizeof(sendbuf)-Ustrlen(sendbuf)-1);
- Ustrncat(sendbuf, "\r\n", sizeof(sendbuf)-Ustrlen(sendbuf)-1);
}
- /* send a blank line between options and message */
- Ustrncat(sendbuf, "\n", sizeof(sendbuf)-Ustrlen(sendbuf)-1);
- /* Now we send the input buffer */
- DEBUG(D_acl)
- debug_printf("%s\n****************************\n", sendbuf);
- flushbuffer(sockfd, sendbuf);
-
- /* now send the message */
- /* Clear the input buffer */
- bzero(sendbuf, sizeof(sendbuf));
- /* First send the headers */
- /* Now send the headers */
- DEBUG(D_acl)
- debug_printf("Sending headers:\n****************************\n");
- Ustrncpy(sendbuf, dcchdr->text, sizeof(sendbuf)-2);
- while((dcchdr=dcchdr->next)) {
- if(dcchdr->slen > sizeof(sendbuf)-2) {
- /* The size of the header is bigger than the size of
- * the input buffer, so split it up in smaller parts. */
- flushbuffer(sockfd, sendbuf);
- bzero(sendbuf, sizeof(sendbuf));
- j = 0;
- while(j < dcchdr->slen)
- {
- for(i = 0; i < sizeof(sendbuf)-2; i++) {
- sendbuf[i] = dcchdr->text[j];
- j++;
- }
- flushbuffer(sockfd, sendbuf);
- bzero(sendbuf, sizeof(sendbuf));
- }
- } else if(Ustrlen(sendbuf) + dcchdr->slen > sizeof(sendbuf)-2) {
- flushbuffer(sockfd, sendbuf);
- bzero(sendbuf, sizeof(sendbuf));
- Ustrncpy(sendbuf, dcchdr->text, sizeof(sendbuf)-2);
- } else {
- Ustrncat(sendbuf, dcchdr->text, sizeof(sendbuf)-Ustrlen(sendbuf)-2);
+else
+ {
+ /* connecting to the dccifd UNIX socket */
+ bzero(&serv_addr, sizeof(serv_addr));
+ serv_addr.sun_family = AF_UNIX;
+ Ustrncpy(US serv_addr.sun_path, sockpath, sizeof(serv_addr.sun_path));
+ if ((sockfd = socket(AF_UNIX, SOCK_STREAM,0)) < 0)
+ {
+ DEBUG(D_acl)
+ debug_printf("DCC: Creating UNIX socket connection failed: %s\n", strerror(errno));
+ log_write(0,LOG_PANIC,"DCC: Creating UNIX socket connection failed: %s\n", strerror(errno));
+ /* if we cannot create the socket, defer the mail */
+ (void)fclose(data_file);
+ return retval;
+ }
+ /* Now connecting the socket (UNIX) */
+ if (connect(sockfd, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) < 0)
+ {
+ DEBUG(D_acl)
+ debug_printf("DCC: Connecting to UNIX socket failed: %s\n", strerror(errno));
+ log_write(0,LOG_PANIC,"DCC: Connecting to UNIX socket failed: %s\n", strerror(errno));
+ /* if we cannot contact the socket, defer the mail */
+ (void)fclose(data_file);
+ return retval;
}
}
+/* the socket is open, now send the options to dccifd*/
+DEBUG(D_acl)
+ debug_printf("DCC: -----------------------------------\nDCC: Socket opened; now sending input\n"
+ "DCC: -----------------------------------\n");
- /* a blank line separates header from body */
- Ustrncat(sendbuf, "\n", sizeof(sendbuf)-Ustrlen(sendbuf)-1);
- flushbuffer(sockfd, sendbuf);
+/* let's send each of the recipients to dccifd */
+for (int i = 0; i < recipients_count; i++)
+ {
DEBUG(D_acl)
- debug_printf("\n****************************\n%s", sendbuf);
+ debug_printf("DCC: recipient = %s\n",recipients_list[i].address);
+ dcc_headers = string_append(dcc_headers, 2, recipients_list[i].address, "\n");
+ }
+/* send a blank line between options and message */
+dcc_headers = string_catn(dcc_headers, US"\n", 1);
+
+/* Now we send the input buffer */
+DEBUG(D_acl)
+ debug_printf("DCC: ***********************************\nDCC: Sending options:\n%Y"
+ "DCC: ***********************************\n", dcc_headers);
+if (flushbuffer(sockfd, dcc_headers) != 0)
+ {
+ (void)fclose(data_file);
+ return retval;
+ }
+
+/* now send the message */
+/* First send the headers */
+DEBUG(D_acl)
+ debug_printf("DCC: ***********************************\nDCC: Sending headers:\n");
+sendbuf = string_get(8192);
+sendbuf = string_catn(sendbuf, mail_headers->text, mail_headers->slen);
+while((mail_headers=mail_headers->next))
+ sendbuf = string_catn(sendbuf, mail_headers->text, mail_headers->slen);
+
+/* a blank line separates header from body */
+sendbuf = string_catn(sendbuf, US"\r\n", 2);
+gstring_release_unused(sendbuf);
+DEBUG(D_acl)
+ debug_printf("%YDCC: ***********************************\n", sendbuf);
+if (flushbuffer(sockfd, sendbuf) != 0)
+ {
+ (void)fclose(data_file);
+ return retval;
+ }
+
+/* now send the body */
+DEBUG(D_acl)
+ debug_printf("DCC: ***********************************\nDCC: Writing body:\n");
+(void)fseek(data_file, spool_data_start_offset(message_id), SEEK_SET);
- /* Clear the input buffer */
- bzero(sendbuf, sizeof(sendbuf));
+gstring filebuf = { .size = big_buffer_size, .ptr = 0, .s = big_buffer };
- /* now send the body */
+while((filebuf.ptr = fread(filebuf.s, 1, filebuf.size, data_file)) > 0)
+ if (flushbuffer(sockfd, &filebuf) != 0)
+ {
+ (void)fclose(data_file);
+ return retval;
+ }
+DEBUG(D_acl)
+ debug_printf("DCC: ***********************************\n");
+
+/* shutdown() the socket */
+if(shutdown(sockfd, SHUT_WR) < 0)
+ {
DEBUG(D_acl)
- debug_printf("Writing body:\n****************************\n");
- (void)fseek(data_file, SPOOL_DATA_START_OFFSET, SEEK_SET);
- while((fread(sendbuf, 1, sizeof(sendbuf)-1, data_file)) > 0) {
- flushbuffer(sockfd, sendbuf);
- bzero(sendbuf, sizeof(sendbuf));
+ debug_printf("DCC: Couldn't shutdown socket: %s\n", strerror(errno));
+ log_write(0,LOG_MAIN,"DCC: Couldn't shutdown socket: %s\n", strerror(errno));
+ /* If there is a problem with the shutdown()
+ * defer the mail. */
+ (void)fclose(data_file);
+ return retval;
}
- DEBUG(D_acl)
- debug_printf("\n****************************\n");
-
- /* shutdown() the socket */
- if(shutdown(sockfd, 1) < 0){
+DEBUG(D_acl)
+ debug_printf("DCC: Input sent.\n"
+ "DCC: +++++++++++++++++++++++++++++++++++\n"
+ "DCC: Now receiving output from server\n"
+ "DCC: -----------------------------------\n");
+
+/********************************
+ * receiving output from dccifd *
+ ********************************/
+
+/******************************************************************
+ * We should get 3 lines: *
+ * 1/ First line is overall result: either 'A' for Accept, *
+ * 'R' for Reject, 'S' for accept Some recipients or *
+ * 'T' for a Temporary error. *
+ * 2/ Second line contains the list of Accepted/Rejected *
+ * recipients in the form AARRA (A = accepted, R = rejected). *
+ * 3/ Third line contains the X-DCC header. *
+ ******************************************************************/
+
+int line = 1; /* we start at the first line of the output */
+int bufoffset;
+
+dcc_header_str = string_get(DCC_HEADER_LIMIT + 2);
+/* Let's read from the socket until there's nothing left to read */
+while((dcc_resplen = read(sockfd, big_buffer, big_buffer_size-1)) > 0)
+ {
+ /* fail on read error */
+ if(dcc_resplen < 0)
+ {
DEBUG(D_acl)
- debug_printf("Couldn't shutdown socket: %s\n", strerror(errno));
- log_write(0,LOG_MAIN,"Couldn't shutdown socket: %s\n", strerror(errno));
- /* If there is a problem with the shutdown()
- * defer the mail. */
+ debug_printf("DCC: Error reading from socket: %s\n", strerror(errno));
(void)fclose(data_file);
return retval;
- }
+ }
+ /* make the answer 0-terminated. only needed for debug_printf */
DEBUG(D_acl)
- debug_printf("\n-------------------------\nInput sent.\n-------------------------\n");
+ debug_printf("DCC: Length of the output buffer is: %d\nDCC: Output buffer is:\n"
+ "DCC: -----------------------------------\n%.*s\n"
+ "DCC: -----------------------------------\n", dcc_resplen, dcc_resplen, big_buffer);
- /********************************
- * receiving output from dccifd *
- ********************************/
- DEBUG(D_acl)
- debug_printf("\n-------------------------------------\nNow receiving output from server\n-----------------------------------\n");
-
- /******************************************************************
- * We should get 3 lines: *
- * 1/ First line is overall result: either 'A' for Accept, *
- * 'R' for Reject, 'S' for accept Some recipients or *
- * 'T' for a Temporary error. *
- * 2/ Second line contains the list of Accepted/Rejected *
- * recipients in the form AARRA (A = accepted, R = rejected). *
- * 3/ Third line contains the X-DCC header. *
- ******************************************************************/
-
- line = 1; /* we start at the first line of the output */
- j = 0; /* will be used as index for the recipients list */
- k = 0; /* initializing the index of the X-DCC header: xhdr[k] */
-
- /* Let's read from the socket until there's nothing left to read */
- bzero(recvbuf, sizeof(recvbuf));
- while((resp = read(sockfd, recvbuf, sizeof(recvbuf)-1)) > 0) {
- /* How much did we get from the socket */
- c = Ustrlen(recvbuf) + 1;
- DEBUG(D_acl)
- debug_printf("Length of the output buffer is: %d\nOutput buffer is:\n------------\n%s\n-----------\n", c, recvbuf);
-
- /* Now let's read each character and see what we've got */
- for(i = 0; i < c; i++) {
- /* First check if we reached the end of the line and
- * then increment the line counter */
- if(recvbuf[i] == '\n') {
- line++;
+ /* Now let's read each character and see what we've got */
+ for(bufoffset = 0; bufoffset < dcc_resplen && line <= 2; bufoffset++)
+ {
+ /* First check if we reached the end of the line and
+ then increment the line counter */
+ if(big_buffer[bufoffset] == '\n')
+ line++;
+ else
+ {
+ /* The first character of the first line is the overall response. If
+ there's another character on that line it is not correct. */
+ if(line == 1)
+ {
+ if(bufoffset == 0)
+ {
+ /* Now get the value and set the return value accordingly */
+ switch (big_buffer[bufoffset])
+ {
+ case 'A':
+ DEBUG(D_acl)
+ debug_printf("DCC: Overall result = A\treturning OK\n");
+ dcc_return_text = US"Mail accepted by DCC";
+ dcc_result = US"A";
+ retval = OK;
+ break;
+ case 'R':
+ DEBUG(D_acl)
+ debug_printf("DCC: Overall result = R\treturning FAIL\n");
+ dcc_return_text = US"Rejected by DCC";
+ dcc_result = US"R";
+ retval = FAIL;
+ if(sender_host_name)
+ log_write(0, LOG_MAIN, "H=%s [%s] F=<%s>: rejected by DCC",
+ sender_host_name, sender_host_address, sender_address);
+ else
+ log_write(0, LOG_MAIN, "H=[%s] F=<%s>: rejected by DCC",
+ sender_host_address, sender_address);
+ break;
+ case 'S':
+ DEBUG(D_acl)
+ debug_printf("DCC: Overall result = S\treturning OK\n");
+ dcc_return_text = US"Not all recipients accepted by DCC";
+ /* Since we're in an ACL we want a global result so we accept for all */
+ dcc_result = US"A";
+ retval = OK;
+ break;
+ case 'G':
+ DEBUG(D_acl)
+ debug_printf("DCC: Overall result = G\treturning FAIL\n");
+ dcc_return_text = US"Greylisted by DCC";
+ dcc_result = US"G";
+ retval = FAIL;
+ break;
+ case 'T':
+ DEBUG(D_acl)
+ debug_printf("DCC: Overall result = T\treturning DEFER\n");
+ dcc_return_text = US"Temporary error with DCC";
+ dcc_result = US"T";
+ retval = DEFER;
+ log_write(0,LOG_MAIN,"Temporary error with DCC: %s\n", big_buffer);
+ break;
+ default:
+ DEBUG(D_acl)
+ debug_printf("DCC: Overall result = something else\treturning DEFER\n");
+ dcc_return_text = US"Unknown DCC response";
+ dcc_result = US"T";
+ retval = DEFER;
+ log_write(0,LOG_MAIN,"Unknown DCC response: %s\n", big_buffer);
+ break;
+ }
+ }
+ else
+ {
+ /* We're on the first line but not on the first character,
+ * there must be something wrong. */
+ DEBUG(D_acl) debug_printf("DCC: Line = %d but bufoffset = %d != 0"
+ " character is %c - This is wrong!\n", line, bufoffset, big_buffer[bufoffset]);
+ log_write(0,LOG_MAIN,"Wrong header from DCC, output is %s\n", big_buffer);
+ }
+ }
+ else if(line == 2)
+ {
+ /* On the second line we get a list of answers for each recipient. We
+ don't care about it because we're in an acl and take the global result. */
+ }
}
- else {
- /* The first character of the first line is the
- * overall response. If there's another character
- * on that line it is not correct. */
- if(line == 1) {
- if(i == 0) {
- /* Now get the value and set the
- * return value accordingly */
- if(recvbuf[i] == 'A') {
- DEBUG(D_acl)
- debug_printf("Overall result = A\treturning OK\n");
- Ustrcpy(dcc_return_text, "Mail accepted by DCC");
- dcc_result = US"A";
- retval = OK;
- }
- else if(recvbuf[i] == 'R') {
- DEBUG(D_acl)
- debug_printf("Overall result = R\treturning FAIL\n");
- dcc_result = US"R";
- retval = FAIL;
- if(sender_host_name) {
- log_write(0, LOG_MAIN, "H=%s [%s] F=<%s>: rejected by DCC", sender_host_name, sender_host_address, sender_address);
- }
- else {
- log_write(0, LOG_MAIN, "H=[%s] F=<%s>: rejected by DCC", sender_host_address, sender_address);
- }
- Ustrncpy(dcc_return_text, dcc_reject_message, Ustrlen(dcc_reject_message) + 1);
- }
- else if(recvbuf[i] == 'S') {
- DEBUG(D_acl)
- debug_printf("Overall result = S\treturning OK\n");
- Ustrcpy(dcc_return_text, "Not all recipients accepted by DCC");
- /* Since we're in an ACL we want a global result
- * so we accept for all */
- dcc_result = US"A";
- retval = OK;
- }
- else if(recvbuf[i] == 'G') {
- DEBUG(D_acl)
- debug_printf("Overall result = G\treturning FAIL\n");
- Ustrcpy(dcc_return_text, "Greylisted by DCC");
- dcc_result = US"G";
- retval = FAIL;
- }
- else if(recvbuf[i] == 'T') {
- DEBUG(D_acl)
- debug_printf("Overall result = T\treturning DEFER\n");
- retval = DEFER;
- log_write(0,LOG_MAIN,"Temporary error with DCC: %s\n", recvbuf);
- Ustrcpy(dcc_return_text, "Temporary error with DCC");
- dcc_result = US"T";
- }
- else {
- DEBUG(D_acl)
- debug_printf("Overall result = something else\treturning DEFER\n");
- retval = DEFER;
- log_write(0,LOG_MAIN,"Unknown DCC response: %s\n", recvbuf);
- Ustrcpy(dcc_return_text, "Unknown DCC response");
- dcc_result = US"T";
- }
- }
- else {
- /* We're on the first line but not on the first character,
- * there must be something wrong. */
- DEBUG(D_acl)
- debug_printf("Line = %d but i = %d != 0 character is %c - This is wrong!\n", line, i, recvbuf[i]);
- log_write(0,LOG_MAIN,"Wrong header from DCC, output is %s\n", recvbuf);
- }
- }
- else if(line == 2) {
- /* On the second line we get a list of
- * answer for each recipient. We don't care about
- * it because we're in an acl and so just take the
- * global result. */
- }
- else if(line > 2) {
- /* The third and following lines is the X-DCC header,
- * so we store it in xhdr. */
- /* check if we don't get more than what we can handle */
- if(k < sizeof(xhdr)) { /* xhdr has a length of 120 */
- xhdr[k] = recvbuf[i];
- k++;
- }
- else {
- DEBUG(D_acl)
- debug_printf("We got more output than we can store in the X-DCC header. Truncating at 120 characters.\n");
- }
- }
- else {
- /* Wrong line number. There must be a problem with the output. */
- DEBUG(D_acl)
- debug_printf("Wrong line number in output. Line number is %d\n", line);
- }
+ }
+ if(line > 2)
+ {
+ /* The third and following lines are the X-DCC header, so we store it in
+ dcc_header_str up to our limit. */
+ /* check if buffer contains the end of the header .."\n\n" and truncate it */
+ if ((big_buffer[dcc_resplen-1] == '\n') &&
+ (big_buffer[dcc_resplen-2] == '\n'))
+ dcc_resplen -= 2;
+ dcc_resplen -= bufoffset;
+ if (dcc_header_str->ptr + dcc_resplen > DCC_HEADER_LIMIT)
+ {
+ dcc_resplen = DCC_HEADER_LIMIT - dcc_header_str->ptr;
+ DEBUG(D_acl) debug_printf("DCC: We got more output than we can store"
+ "in the X-DCC header. Truncating at 120 characters.\n");
}
+ dcc_header_str = string_catn(dcc_header_str, &big_buffer[bufoffset], dcc_resplen);
}
- /* we reinitialize the output buffer before we read again */
- bzero(recvbuf,sizeof(recvbuf));
}
- /* We have read everything from the socket */
-
- /* We need the terminate the X-DCC header with a '\n' character. This needs to be k-1
- * for xhdr[k] contains '\0'. */
- xhdr[k-1] = '\n';
-
- /* Now let's sum up what we've got. */
- DEBUG(D_acl)
- debug_printf("\n--------------------------\nOverall result = %d\nX-DCC header: %sReturn message: %s\ndcc_result: %s\n", retval, xhdr, dcc_return_text, dcc_result);
-
- /* We only add the X-DCC header if it starts with X-DCC */
- if(!(Ustrncmp(xhdr, "X-DCC", 5))){
- dcc_header = xhdr;
- if(dcc_direct_add_header) {
- header_add(' ' , "%s", xhdr);
- /* since the MIME ACL already writes the .eml file to disk without DCC Header we've to erase it */
- unspool_mbox();
+/* We have read everything from the socket. make sure the header ends with "\n" */
+dcc_header_str = string_catn(dcc_header_str, US"\n", 1);
+
+(void) string_from_gstring(dcc_header_str);
+/* Now let's sum up what we've got. */
+DEBUG(D_acl)
+ debug_printf("\nDCC: --------------------------\nDCC: Overall result = %d\n"
+ "DCC: X-DCC header: %YReturn message: %s\nDCC: dcc_result: %s\n",
+ retval, dcc_header_str, dcc_return_text, dcc_result);
+
+/* We only add the X-DCC header if it starts with X-DCC */
+if(!(Ustrncmp(dcc_header_str->s, "X-DCC", 5)))
+ {
+ dcc_header = string_from_gstring(dcc_header_str);
+ if(dcc_direct_add_header)
+ {
+ header_add(' ' , "%s", dcc_header);
+/* since the MIME ACL already writes the .eml file to disk without DCC Header we've to erase it */
+ unspool_mbox();
}
}
- else {
- DEBUG(D_acl)
- debug_printf("Wrong format of the X-DCC header: %s\n", xhdr);
- }
+else
+ DEBUG(D_acl)
+ debug_printf("DCC: Wrong format of the X-DCC header: %Y\n", dcc_header_str);
- /* check if we should add additional headers passed in acl_m_dcc_add_header */
- if(dcc_direct_add_header) {
- if (((xtra_hdrs = expand_string(US"$acl_m_dcc_add_header")) != NULL) && (xtra_hdrs[0] != '\0')) {
- Ustrncpy(dcc_xtra_hdrs, xtra_hdrs, sizeof(dcc_xtra_hdrs) - 2);
- if (dcc_xtra_hdrs[Ustrlen(dcc_xtra_hdrs)-1] != '\n')
- Ustrcat(dcc_xtra_hdrs, "\n");
- header_add(' ', "%s", dcc_xtra_hdrs);
- DEBUG(D_acl)
- debug_printf("adding additional headers in $acl_m_dcc_add_header: %s", dcc_xtra_hdrs);
+/* check if we should add additional headers passed in acl_m_dcc_add_header */
+if (dcc_direct_add_header)
+ {
+ if (((xtra_hdrs = expand_string(US"$acl_m_dcc_add_header")) != NULL) && (xtra_hdrs[0] != '\0'))
+ {
+ dcc_xtra_hdrs = string_cat(NULL, xtra_hdrs);
+ if (dcc_xtra_hdrs->s[dcc_xtra_hdrs->ptr - 1] != '\n')
+ dcc_xtra_hdrs = string_catn(dcc_xtra_hdrs, US"\n", 1);
+ header_add(' ', "%s", string_from_gstring(dcc_xtra_hdrs));
+ DEBUG(D_acl)
+ debug_printf("DCC: adding additional headers in $acl_m_dcc_add_header: %Y", dcc_xtra_hdrs);
}
}
- dcc_ok = 1;
- /* Now return to exim main process */
- DEBUG(D_acl)
- debug_printf("Before returning to exim main process:\nreturn_text = %s - retval = %d\ndcc_result = %s\n", dcc_return_text, retval, dcc_result);
+dcc_ok = 1;
+/* Now return to exim main process */
+DEBUG(D_acl)
+ debug_printf("DCC: Before returning to exim main process:\nDCC: return_text = %s - retval = %d\n"
+ "DCC: dcc_result = %s\n", dcc_return_text, retval, dcc_result);
- (void)fclose(data_file);
- dcc_rc = retval;
- return dcc_rc;
+(void)fclose(data_file);
+dcc_rc = retval;
+return dcc_rc;
}
#endif
git://git.exim.org / exim.git / blobdiff