* Exim - an Internet mail transport agent *
*************************************************/
-/* Copyright (c) University of Cambridge 1995 - 2013 */
+/* Copyright (c) University of Cambridge 1995 - 2014 */
/* See the file NOTICE for conditions of use and distribution. */
/* General functions concerned with transportation, and generic options for all
+/* Add/remove/rewwrite headers, and send them plus the empty-line sparator.
+
+Globals:
+ header_list
+
+Arguments:
+ addr (chain of) addresses (for extra headers), or NULL;
+ only the first address is used
+ fd file descriptor to write the message to
+ sendfn function for output
+ use_crlf turn NL into CR LF
+ rewrite_rules chain of header rewriting rules
+ rewrite_existflags flags for the rewriting rules
+
+Returns: TRUE on success; FALSE on failure.
+*/
+BOOL
+transport_headers_send(address_item *addr, int fd, uschar *add_headers, uschar *remove_headers,
+ BOOL (*sendfn)(int fd, uschar * s, int len, BOOL use_crlf),
+ BOOL use_crlf, rewrite_rule *rewrite_rules, int rewrite_existflags)
+{
+header_line *h;
+
+/* Then the message's headers. Don't write any that are flagged as "old";
+that means they were rewritten, or are a record of envelope rewriting, or
+were removed (e.g. Bcc). If remove_headers is not null, skip any headers that
+match any entries therein. It is a colon-sep list; expand the items
+separately and squash any empty ones.
+Then check addr->p.remove_headers too, provided that addr is not NULL. */
+
+for (h = header_list; h != NULL; h = h->next) if (h->type != htype_old)
+ {
+ int i;
+ uschar *list = remove_headers;
+
+ BOOL include_header = TRUE;
+
+ for (i = 0; i < 2; i++) /* For remove_headers && addr->p.remove_headers */
+ {
+ if (list)
+ {
+ int sep = ':'; /* This is specified as a colon-separated list */
+ uschar *s, *ss;
+ uschar buffer[128];
+ while ((s = string_nextinlist(&list, &sep, buffer, sizeof(buffer))))
+ {
+ int len;
+
+ if (i == 0)
+ if (!(s = expand_string(s)) && !expand_string_forcedfail)
+ {
+ errno = ERRNO_CHHEADER_FAIL;
+ return FALSE;
+ }
+ len = Ustrlen(s);
+ if (strncmpic(h->text, s, len) != 0) continue;
+ ss = h->text + len;
+ while (*ss == ' ' || *ss == '\t') ss++;
+ if (*ss == ':') break;
+ }
+ if (s != NULL) { include_header = FALSE; break; }
+ }
+ if (addr != NULL) list = addr->p.remove_headers;
+ }
+
+ /* If this header is to be output, try to rewrite it if there are rewriting
+ rules. */
+
+ if (include_header)
+ {
+ if (rewrite_rules)
+ {
+ void *reset_point = store_get(0);
+ header_line *hh;
+
+ if ((hh = rewrite_header(h, NULL, NULL, rewrite_rules, rewrite_existflags, FALSE)))
+ {
+ if (!sendfn(fd, hh->text, hh->slen, use_crlf)) return FALSE;
+ store_reset(reset_point);
+ continue; /* With the next header line */
+ }
+ }
+
+ /* Either no rewriting rules, or it didn't get rewritten */
+
+ if (!sendfn(fd, h->text, h->slen, use_crlf)) return FALSE;
+ }
+
+ /* Header removed */
+
+ else
+ {
+ DEBUG(D_transport) debug_printf("removed header line:\n%s---\n", h->text);
+ }
+ }
+
+/* Add on any address-specific headers. If there are multiple addresses,
+they will all have the same headers in order to be batched. The headers
+are chained in reverse order of adding (so several addresses from the
+same alias might share some of them) but we want to output them in the
+opposite order. This is a bit tedious, but there shouldn't be very many
+of them. We just walk the list twice, reversing the pointers each time,
+but on the second time, write out the items.
+
+Headers added to an address by a router are guaranteed to end with a newline.
+*/
+
+if (addr)
+ {
+ int i;
+ header_line *hprev = addr->p.extra_headers;
+ header_line *hnext;
+ for (i = 0; i < 2; i++)
+ {
+ for (h = hprev, hprev = NULL; h != NULL; h = hnext)
+ {
+ hnext = h->next;
+ h->next = hprev;
+ hprev = h;
+ if (i == 1)
+ {
+ if (!sendfn(fd, h->text, h->slen, use_crlf)) return FALSE;
+ DEBUG(D_transport)
+ debug_printf("added header line(s):\n%s---\n", h->text);
+ }
+ }
+ }
+ }
+
+/* If a string containing additional headers exists it is a newline-sep
+list. Expand each item and write out the result. This is done last so that
+if it (deliberately or accidentally) isn't in header format, it won't mess
+up any other headers. An empty string or a forced expansion failure are
+noops. An added header string from a transport may not end with a newline;
+add one if it does not. */
+
+if (add_headers)
+ {
+ int sep = '\n';
+ uschar * s;
+
+ while ((s = string_nextinlist(&add_headers, &sep, NULL, 0)))
+ if (!(s = expand_string(s)))
+ {
+ if (!expand_string_forcedfail)
+ { errno = ERRNO_CHHEADER_FAIL; return FALSE; }
+ }
+ else
+ {
+ int len = Ustrlen(s);
+ if (len > 0)
+ {
+ if (!sendfn(fd, s, len, use_crlf)) return FALSE;
+ if (s[len-1] != '\n' && !sendfn(fd, US"\n", 1, use_crlf))
+ return FALSE;
+ DEBUG(D_transport)
+ {
+ debug_printf("added header line:\n%s", s);
+ if (s[len-1] != '\n') debug_printf("\n");
+ debug_printf("---\n");
+ }
+ }
+ }
+ }
+
+/* Separate headers from body with a blank line */
+
+return sendfn(fd, US"\n", 1, use_crlf);
+}
+
+
/*************************************************
* Write the message *
*************************************************/
{
int written = 0;
int len;
-header_line *h;
BOOL use_crlf = (options & topt_use_crlf) != 0;
/* Initialize pointer in output buffer. */
were removed (e.g. Bcc). If remove_headers is not null, skip any headers that
match any entries therein. Then check addr->p.remove_headers too, provided that
addr is not NULL. */
-
- if (remove_headers != NULL)
- {
- uschar *s = expand_string(remove_headers);
- if (s == NULL && !expand_string_forcedfail)
- {
- errno = ERRNO_CHHEADER_FAIL;
- return FALSE;
- }
- remove_headers = s;
- }
-
- for (h = header_list; h != NULL; h = h->next)
- {
- int i;
- uschar *list = NULL;
- BOOL include_header;
-
- if (h->type == htype_old) continue;
-
- include_header = TRUE;
- list = remove_headers;
-
- for (i = 0; i < 2; i++) /* For remove_headers && addr->p.remove_headers */
- {
- if (list != NULL)
- {
- int sep = ':'; /* This is specified as a colon-separated list */
- uschar *s, *ss;
- uschar buffer[128];
- while ((s = string_nextinlist(&list, &sep, buffer, sizeof(buffer)))
- != NULL)
- {
- int len = Ustrlen(s);
- if (strncmpic(h->text, s, len) != 0) continue;
- ss = h->text + len;
- while (*ss == ' ' || *ss == '\t') ss++;
- if (*ss == ':') break;
- }
- if (s != NULL) { include_header = FALSE; break; }
- }
- if (addr != NULL) list = addr->p.remove_headers;
- }
-
- /* If this header is to be output, try to rewrite it if there are rewriting
- rules. */
-
- if (include_header)
- {
- if (rewrite_rules != NULL)
- {
- void *reset_point = store_get(0);
- header_line *hh =
- rewrite_header(h, NULL, NULL, rewrite_rules, rewrite_existflags,
- FALSE);
- if (hh != NULL)
- {
- if (!write_chunk(fd, hh->text, hh->slen, use_crlf)) return FALSE;
- store_reset(reset_point);
- continue; /* With the next header line */
- }
- }
-
- /* Either no rewriting rules, or it didn't get rewritten */
-
- if (!write_chunk(fd, h->text, h->slen, use_crlf)) return FALSE;
- }
-
- /* Header removed */
-
- else
- {
- DEBUG(D_transport) debug_printf("removed header line:\n%s---\n",
- h->text);
- }
- }
-
- /* Add on any address-specific headers. If there are multiple addresses,
- they will all have the same headers in order to be batched. The headers
- are chained in reverse order of adding (so several addresses from the
- same alias might share some of them) but we want to output them in the
- opposite order. This is a bit tedious, but there shouldn't be very many
- of them. We just walk the list twice, reversing the pointers each time,
- but on the second time, write out the items.
-
- Headers added to an address by a router are guaranteed to end with a newline.
- */
-
- if (addr != NULL)
- {
- int i;
- header_line *hprev = addr->p.extra_headers;
- header_line *hnext;
- for (i = 0; i < 2; i++)
- {
- for (h = hprev, hprev = NULL; h != NULL; h = hnext)
- {
- hnext = h->next;
- h->next = hprev;
- hprev = h;
- if (i == 1)
- {
- if (!write_chunk(fd, h->text, h->slen, use_crlf)) return FALSE;
- DEBUG(D_transport)
- debug_printf("added header line(s):\n%s---\n", h->text);
- }
- }
- }
- }
-
- /* If a string containing additional headers exists, expand it and write
- out the result. This is done last so that if it (deliberately or accidentally)
- isn't in header format, it won't mess up any other headers. An empty string
- or a forced expansion failure are noops. An added header string from a
- transport may not end with a newline; add one if it does not. */
-
- if (add_headers != NULL)
- {
- uschar *s = expand_string(add_headers);
- if (s == NULL)
- {
- if (!expand_string_forcedfail)
- {
- errno = ERRNO_CHHEADER_FAIL;
- return FALSE;
- }
- }
- else
- {
- int len = Ustrlen(s);
- if (len > 0)
- {
- if (!write_chunk(fd, s, len, use_crlf)) return FALSE;
- if (s[len-1] != '\n' && !write_chunk(fd, US"\n", 1, use_crlf))
- return FALSE;
- DEBUG(D_transport)
- {
- debug_printf("added header line(s):\n%s", s);
- if (s[len-1] != '\n') debug_printf("\n");
- debug_printf("---\n");
- }
- }
- }
- }
-
- /* Separate headers from body with a blank line */
-
- if (!write_chunk(fd, US"\n", 1, use_crlf)) return FALSE;
+ if (!transport_headers_send(addr, fd, add_headers, remove_headers, &write_chunk,
+ use_crlf, rewrite_rules, rewrite_existflags))
+ return FALSE;
}
/* If the body is required, ensure that the data for check strings (formerly
return TRUE;
}
+/* vi: aw ai sw=2
+*/
/* End of transport.c */
projects / exim.git / blobdiff