+/*************************************************
+* Exim - an Internet mail transport agent *
+*************************************************/
+
+/* Copyright (c) Andrew Colin Kissa <andrew@topdog.za.net> 2016 */
+/* Copyright (c) University of Cambridge 2016 */
+/* See the file NOTICE for conditions of use and distribution. */
+
+
+#include "../exim.h"
+#include "queuefile.h"
+
+/* Options specific to the appendfile transport. They must be in alphabetic
+order (note that "_" comes before the lower case letters). Some of them are
+stored in the publicly visible instance block - these are flagged with the
+opt_public flag. */
+
+optionlist queuefile_transport_options[] = {
+ { "directory", opt_stringptr,
+ (void *)offsetof(queuefile_transport_options_block, dirname) },
+};
+
+/* Size of the options list. An extern variable has to be used so that its
+address can appear in the tables drtables.c. */
+
+int queuefile_transport_options_count =
+ sizeof(queuefile_transport_options) / sizeof(optionlist);
+
+/* Default private options block for the appendfile transport. */
+
+queuefile_transport_options_block queuefile_transport_option_defaults = {
+ NULL, /* dirname */
+};
+
+/*************************************************
+* Initialization entry point *
+*************************************************/
+
+void queuefile_transport_init(transport_instance *tblock)
+{
+queuefile_transport_options_block *ob =
+ (queuefile_transport_options_block *)(tblock->options_block);
+
+if (ob->dirname == NULL)
+ log_write(0, LOG_PANIC_DIE | LOG_CONFIG,
+ "directory must be set for the %s transport", tblock->name);
+}
+
+/* This function will copy from a file to another
+
+Arguments:
+ to_fd FILE to write to (the destination queue file)
+ from_fd FILE to read from (the spool queue file)
+
+Returns: TRUE if all went well, FALSE otherwise
+*/
+
+static BOOL copy_spool_file (FILE *to_fd, FILE *from_fd)
+{
+int i, j;
+uschar buffer[16384];
+
+rewind(from_fd);
+
+do
+ {
+ j = fread(buffer, 1, sizeof(buffer), from_fd);
+ if (j > 0)
+ {
+ i = fwrite(buffer, j, 1, to_fd);
+ if (i != 1)
+ return FALSE;
+ }
+ }
+while (j > 0);
+return TRUE;
+}
+
+/* This function performs the actual copying of the header
+and data files to the destination directory
+
+Arguments:
+ tname uschar the transport name
+ addr address_item being processed
+ sdfd int Source directory fd
+ ddfd int Destination directory fd
+ suffix uschar file suffix
+ dirname uschar Destination directory
+ link_file BOOL use linkat instead of data copy
+ is_data_file BOOL the file is a data file not a header file
+ dst_file FILE to write to
+ src_file FILE to read from
+
+Returns: TRUE if all went well, FALSE otherwise
+*/
+
+static BOOL copy_spool_files(uschar *tname, address_item *addr,
+ int sdfd, int ddfd, uschar *suffix, uschar *dirname, BOOL link_file,
+ BOOL is_data_file, FILE *dst_file, FILE *src_file)
+{
+int dstfd, srcfd;
+/*
+uschar message_subdir[2];
+message_subdir[1] = '\0';
+message_subdir[0] = split_spool_directory? message_id[5] : 0;
+*/
+uschar *filename = string_sprintf("%s-%s", message_id, suffix);
+/*
+uschar *srcpath = string_sprintf("%s/%s/%s/%s-%s", spool_directory,
+ US"input", message_subdir, message_id, suffix);
+*/
+uschar *srcpath = spool_fname(US"input", message_subdir, message_id, suffix);
+uschar *dstpath = string_sprintf("%s/%s-%s", dirname, message_id, suffix);
+
+if (link_file)
+ {
+ /* use linkat */
+ DEBUG(D_transport)
+ debug_printf("%s transport, linking %s => %s\n", tname,
+ srcpath, dstpath);
+ if (linkat(sdfd, CCS filename, ddfd, CCS filename, 0) < 0)
+ return FALSE;
+ return TRUE;
+ }
+else
+ {
+ /* use data copy */
+ DEBUG(D_transport)
+ debug_printf("%s transport, copying %s => %s\n", tname,
+ srcpath, dstpath);
+ if ((dstfd =
+ openat(ddfd, CCS filename, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE)) < 0)
+ {
+ addr->transport_return = DEFER;
+ addr->basic_errno = errno;
+ addr->message = string_sprintf("%s transport opening file: %s "
+ "failed with error: %s", tname, dstpath, strerror(errno));
+ return FALSE;
+ }
+
+ fchmod(dstfd, SPOOL_MODE);
+
+ if ((dst_file = fdopen(dstfd, "wb")) < 0)
+ {
+ addr->transport_return = DEFER;
+ addr->basic_errno = errno;
+ addr->message = string_sprintf("%s transport opening file fd: %s "
+ "failed with error: %s", tname, dstpath, strerror(errno));
+ (void)close(dstfd);
+ return FALSE;
+ }
+
+ if (is_data_file)
+ srcfd = deliver_datafile;
+ else
+ {
+ if ((srcfd = openat(sdfd, CCS filename, O_RDONLY)) < 0)
+ {
+ addr->transport_return = DEFER;
+ addr->basic_errno = errno;
+ addr->message = string_sprintf("%s transport opening file: %s "
+ "failed with error: %s", tname, srcpath, strerror(errno));
+ return FALSE;
+ }
+ }
+
+ if ((src_file = fdopen(srcfd, "rb")) < 0)
+ {
+ addr->transport_return = DEFER;
+ addr->basic_errno = errno;
+ addr->message = string_sprintf("%s transport opening file fd: "
+ "%s failed with error: %s", tname, srcpath, strerror(errno));
+ if (!is_data_file) (void)close(srcfd);
+ return FALSE;
+ }
+
+ if (!copy_spool_file(dst_file, src_file))
+ {
+ addr->transport_return = DEFER;
+ addr->message = string_sprintf("%s transport creating file: "
+ "%s failed with error: %s", tname, dstpath, strerror(errno));
+ return FALSE;
+ }
+
+ if (!is_data_file)
+ {
+ (void)fclose(src_file);
+ src_file = NULL;
+ }
+
+ (void)fclose(dst_file);
+ dst_file = NULL;
+
+ } /* end data copy */
+
+return TRUE;
+}
+
+/*************************************************
+* Main entry point *
+*************************************************/
+
+/* This transport always returns FALSE, indicating that the status in
+the first address is the status for all addresses in a batch. */
+
+BOOL queuefile_transport_entry(transport_instance *tblock,
+ address_item *addr)
+{
+BOOL link_file;
+BOOL is_data_file;
+uschar *sourcedir;
+struct stat dstatbuf;
+struct stat sstatbuf;
+FILE *dst_file = NULL;
+FILE *src_file = NULL;
+/* uschar message_subdir[2]; */
+int ddfd, sdfd, dfd_oflags;
+queuefile_transport_options_block *ob =
+ (queuefile_transport_options_block *)(tblock->options_block);
+
+DEBUG(D_transport)
+ debug_printf("%s transport entered\n", tblock->name);
+
+# ifndef O_DIRECTORY
+# define O_DIRECTORY 0
+# endif
+
+dfd_oflags = O_RDONLY|O_DIRECTORY;
+#ifdef O_NOFOLLOW
+dfd_oflags |= O_NOFOLLOW;
+#endif
+
+if (ob->dirname[0] != '/')
+ {
+ addr->transport_return = PANIC;
+ addr->message = string_sprintf("%s transport directory: "
+ "%s is not absolute", tblock->name, ob->dirname);
+ return FALSE;
+ }
+
+if ((ddfd = Uopen(ob->dirname, dfd_oflags, 0)) < 0)
+ {
+ addr->transport_return = PANIC;
+ addr->basic_errno = errno;
+ addr->message = string_sprintf("%s transport accessing directory: %s "
+ "failed with error: %s", tblock->name, ob->dirname, strerror(errno));
+ return FALSE;
+ }
+
+
+if ((fstat(ddfd, &dstatbuf)) < 0)
+ {
+ addr->transport_return = PANIC;
+ addr->basic_errno = errno;
+ addr->message = string_sprintf("%s transport fstat on directory fd: "
+ "%s failed with error: %s", tblock->name, ob->dirname, strerror(errno));
+ goto RETURN;
+ }
+
+sourcedir = spool_dname(US"input", message_subdir);
+/*
+message_subdir[1] = '\0';
+message_subdir[0] = split_spool_directory? message_id[5] : 0;
+sourcedir = string_sprintf("%s/%s/%s", spool_directory,
+ US"input", message_subdir);
+*/
+
+if ((sdfd = Uopen(sourcedir, dfd_oflags, 0)) < 0)
+ {
+ addr->transport_return = PANIC;
+ addr->basic_errno = errno;
+ addr->message = string_sprintf("%s transport accessing directory: %s "
+ "failed with error: %s", tblock->name, sourcedir, strerror(errno));
+ goto RETURN;
+ }
+
+if ((fstat(sdfd, &sstatbuf)) < 0)
+ {
+ addr->transport_return = PANIC;
+ addr->basic_errno = errno;
+ addr->message = string_sprintf("%s transport fstat on directory fd: "
+ "%s failed with error: %s", tblock->name, sourcedir, strerror(errno));
+ goto RETURN;
+ }
+
+if (dont_deliver)
+ {
+ DEBUG(D_transport)
+ debug_printf("*** delivery by %s transport bypassed by -N option\n",
+ tblock->name);
+ addr->transport_return = OK;
+ goto RETURN;
+ }
+
+/* process the header file */
+DEBUG(D_transport)
+ debug_printf("%s transport, copying header file\n", tblock->name);
+
+is_data_file = FALSE;
+link_file = (dstatbuf.st_dev == sstatbuf.st_dev);
+
+if ((copy_spool_files(tblock->name, addr, sdfd, ddfd, US"H", ob->dirname,
+ link_file, is_data_file, dst_file, src_file)) == FALSE)
+ goto RETURN;
+
+/* process the data file */
+DEBUG(D_transport)
+ debug_printf("%s transport, copying data file\n", tblock->name);
+
+is_data_file = TRUE;
+
+if ((copy_spool_files(tblock->name, addr, sdfd, ddfd, US"D", ob->dirname,
+ link_file, is_data_file, dst_file, src_file)) == FALSE)
+ {
+ DEBUG(D_transport)
+ debug_printf("%s transport, copying data file failed, "
+ "unlinking the header file\n", tblock->name);
+ Uunlink(string_sprintf("%s/%s-H", ob->dirname, message_id));
+ goto RETURN;
+ }
+
+(void)close(ddfd);
+(void)close(sdfd);
+
+DEBUG(D_transport)
+ debug_printf("%s transport succeeded\n", tblock->name);
+
+addr->transport_return = OK;
+
+RETURN:
+if (dst_file) (void)fclose(dst_file);
+if (src_file && !is_data_file) (void)fclose(src_file);
+if (ddfd) (void)close(ddfd);
+if (sdfd) (void)close(sdfd);
+
+/* A return of FALSE means that if there was an error, a common error was
+put in the first address of a batch. */
+return FALSE;
+}
git://git.exim.org / exim.git / commitdiff