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-rw-r--r--src/transports/queuefile.c282
1 files changed, 282 insertions, 0 deletions
diff --git a/src/transports/queuefile.c b/src/transports/queuefile.c
new file mode 100644
index 0000000..9721854
--- /dev/null
+++ b/src/transports/queuefile.c
@@ -0,0 +1,282 @@
+/*************************************************
+* Exim - an Internet mail transport agent *
+*************************************************/
+
+/* Copyright (c) Andrew Colin Kissa <andrew@topdog.za.net> 2016 */
+/* Copyright (c) University of Cambridge 2016 */
+/* Copyright (c) The Exim Maintainers 1995 - 2020 */
+/* See the file NOTICE for conditions of use and distribution. */
+
+
+
+#include "../exim.h"
+
+#ifdef EXPERIMENTAL_QUEUEFILE /* whole file */
+#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,
+ OPT_OFF(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);
+
+
+#ifdef MACRO_PREDEF
+
+/* Dummy values */
+queuefile_transport_options_block queuefile_transport_option_defaults = {0};
+void queuefile_transport_init(transport_instance *tblock) {}
+BOOL queuefile_transport_entry(transport_instance *tblock, address_item *addr) {return FALSE;}
+
+#else /*!MACRO_PREDEF*/
+
+
+
+/* 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)
+ 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:
+ dst fd to write to (the destination queue file)
+ src fd to read from (the spool queue file)
+
+Returns: TRUE if all went well, FALSE otherwise with errno set
+*/
+
+static BOOL
+copy_spool_file(int dst, int src)
+{
+int i, j;
+uschar buffer[16384];
+
+if (lseek(src, 0, SEEK_SET) != 0)
+ return FALSE;
+
+do
+ if ((j = read(src, buffer, sizeof(buffer))) > 0)
+ for (uschar * s = buffer; (i = write(dst, s, j)) != j; s += i, j -= i)
+ if (i < 0)
+ return FALSE;
+ else if (j < 0)
+ return FALSE;
+while (j > 0);
+return TRUE;
+}
+
+/* This function performs the actual copying of the header
+and data files to the destination directory
+
+Arguments:
+ tb the transport block
+ addr address_item being processed
+ dstpath destination directory name
+ sdfd int Source directory fd
+ ddfd int Destination directory fd
+ link_file BOOL use linkat instead of data copy
+ srcfd fd for data file, or -1 for header file
+
+Returns: TRUE if all went well, FALSE otherwise
+*/
+
+static BOOL
+copy_spool_files(transport_instance * tb, address_item * addr,
+ const uschar * dstpath, int sdfd, int ddfd, BOOL link_file, int srcfd)
+{
+BOOL is_hdr_file = srcfd < 0;
+const uschar * suffix = srcfd < 0 ? US"H" : US"D";
+int dstfd;
+const uschar * filename = string_sprintf("%s-%s", message_id, suffix);
+const uschar * srcpath = spool_fname(US"input", message_subdir, message_id, suffix);
+const uschar * s, * op;
+
+dstpath = string_sprintf("%s/%s-%s", dstpath, message_id, suffix);
+
+if (link_file)
+ {
+ DEBUG(D_transport) debug_printf("%s transport, linking %s => %s\n",
+ tb->name, srcpath, dstpath);
+
+ if (linkat(sdfd, CCS filename, ddfd, CCS filename, 0) >= 0)
+ return TRUE;
+
+ op = US"linking";
+ s = dstpath;
+ }
+else /* use data copy */
+ {
+ DEBUG(D_transport) debug_printf("%s transport, copying %s => %s\n",
+ tb->name, srcpath, dstpath);
+
+ if ( (s = dstpath,
+ (dstfd = exim_openat4(ddfd, CCS filename, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE))
+ < 0
+ )
+ || is_hdr_file
+ && (s = srcpath, (srcfd = exim_openat(sdfd, CCS filename, O_RDONLY)) < 0)
+ )
+ op = US"opening";
+
+ else
+ if (s = dstpath, fchmod(dstfd, SPOOL_MODE) != 0)
+ op = US"setting perms on";
+ else
+ if (!copy_spool_file(dstfd, srcfd))
+ op = US"creating";
+ else
+ return TRUE;
+ }
+
+addr->basic_errno = errno;
+addr->message = string_sprintf("%s transport %s file: %s failed with error: %s",
+ tb->name, op, s, strerror(errno));
+addr->transport_return = DEFER;
+return FALSE;
+}
+
+/*************************************************
+* 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)
+{
+queuefile_transport_options_block * ob =
+ (queuefile_transport_options_block *) tblock->options_block;
+BOOL can_link;
+uschar * sourcedir = spool_dname(US"input", message_subdir);
+uschar * s, * dstdir;
+struct stat dstatbuf, sstatbuf;
+int ddfd = -1, sdfd = -1;
+
+DEBUG(D_transport)
+ debug_printf("%s transport entered\n", tblock->name);
+
+#ifndef O_DIRECTORY
+# define O_DIRECTORY 0
+#endif
+#ifndef O_NOFOLLOW
+# define O_NOFOLLOW 0
+#endif
+
+if (!(dstdir = expand_string(ob->dirname)))
+ {
+ addr->message = string_sprintf("%s transport: failed to expand dirname option",
+ tblock->name);
+ addr->transport_return = DEFER;
+ return FALSE;
+ }
+if (*dstdir != '/')
+ {
+ addr->transport_return = PANIC;
+ addr->message = string_sprintf("%s transport directory: "
+ "%s is not absolute", tblock->name, dstdir);
+ return FALSE;
+ }
+
+/* Open the source and destination directories and check if they are
+on the same filesystem, so we can hard-link files rather than copying. */
+
+if ( (s = dstdir,
+ (ddfd = Uopen(s, O_RDONLY | O_DIRECTORY | O_NOFOLLOW, 0)) < 0)
+ || (s = sourcedir,
+ (sdfd = Uopen(sourcedir, O_RDONLY | O_DIRECTORY | O_NOFOLLOW, 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, s, strerror(errno));
+ if (ddfd >= 0) (void) close(ddfd);
+ return FALSE;
+ }
+
+if ( (s = dstdir, fstat(ddfd, &dstatbuf) < 0)
+ || (s = sourcedir, 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, s, strerror(errno));
+ goto RETURN;
+ }
+can_link = (dstatbuf.st_dev == sstatbuf.st_dev);
+
+if (f.dont_deliver)
+ {
+ DEBUG(D_transport)
+ debug_printf("*** delivery by %s transport bypassed by -N option\n",
+ tblock->name);
+ addr->transport_return = OK;
+ goto RETURN;
+ }
+
+/* Link or copy the header and data spool files */
+
+DEBUG(D_transport)
+ debug_printf("%s transport, copying header file\n", tblock->name);
+
+if (!copy_spool_files(tblock, addr, dstdir, sdfd, ddfd, can_link, -1))
+ goto RETURN;
+
+DEBUG(D_transport)
+ debug_printf("%s transport, copying data file\n", tblock->name);
+
+if (!copy_spool_files(tblock, addr, dstdir, sdfd, ddfd, can_link,
+ deliver_datafile))
+ {
+ DEBUG(D_transport)
+ debug_printf("%s transport, copying data file failed, "
+ "unlinking the header file\n", tblock->name);
+ Uunlink(string_sprintf("%s/%s-H", dstdir, message_id));
+ goto RETURN;
+ }
+
+DEBUG(D_transport)
+ debug_printf("%s transport succeeded\n", tblock->name);
+
+addr->transport_return = OK;
+
+RETURN:
+if (ddfd >= 0) (void) close(ddfd);
+if (sdfd >= 0) (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;
+}
+
+#endif /*!MACRO_PREDEF*/
+#endif /*EXPERIMENTAL_QUEUEFILE*/
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-28 12:48:06 +0000