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Diffstat (limited to 'src/cleanup/cleanup_out.c')
| -rw-r--r-- | src/cleanup/cleanup_out.c | 225 |
1 files changed, 225 insertions, 0 deletions
diff --git a/src/cleanup/cleanup_out.c b/src/cleanup/cleanup_out.c new file mode 100644 index 0000000..8905fad --- /dev/null +++ b/src/cleanup/cleanup_out.c @@ -0,0 +1,225 @@ +/*++ +/* NAME +/* cleanup_out 3 +/* SUMMARY +/* record output support +/* SYNOPSIS +/* #include "cleanup.h" +/* +/* int CLEANUP_OUT_OK(state) +/* CLEANUP_STATE *state; +/* +/* void cleanup_out(state, type, data, len) +/* CLEANUP_STATE *state; +/* int type; +/* const char *data; +/* ssize_t len; +/* +/* void cleanup_out_string(state, type, str) +/* CLEANUP_STATE *state; +/* int type; +/* const char *str; +/* +/* void CLEANUP_OUT_BUF(state, type, buf) +/* CLEANUP_STATE *state; +/* int type; +/* VSTRING *buf; +/* +/* void cleanup_out_format(state, type, format, ...) +/* CLEANUP_STATE *state; +/* int type; +/* const char *format; +/* +/* void cleanup_out_header(state, buf) +/* CLEANUP_STATE *state; +/* VSTRING *buf; +/* DESCRIPTION +/* This module writes records to the output stream. +/* +/* CLEANUP_OUT_OK() is a macro that evaluates to non-zero +/* as long as it makes sense to produce output. All output +/* routines below check for this condition. +/* +/* cleanup_out() is the main record output routine. It writes +/* one record of the specified type, with the specified data +/* and length to the output stream. +/* +/* cleanup_out_string() outputs one string as a record. +/* +/* CLEANUP_OUT_BUF() is an unsafe macro that outputs +/* one string buffer as a record. +/* +/* cleanup_out_format() formats its arguments and writes +/* the result as a record. +/* +/* cleanup_out_header() outputs a multi-line header as records +/* of the specified type. The input is expected to be newline +/* separated (not newline terminated), and is modified. +/* LICENSE +/* .ad +/* .fi +/* The Secure Mailer license must be distributed with this software. +/* AUTHOR(S) +/* Wietse Venema +/* IBM T.J. Watson Research +/* P.O. Box 704 +/* Yorktown Heights, NY 10598, USA +/*--*/ + +/* System library. */ + +#include <sys_defs.h> +#include <errno.h> +#include <stdlib.h> /* 44BSD stdarg.h uses abort() */ +#include <stdarg.h> +#include <string.h> + +/* Utility library. */ + +#include <msg.h> +#include <vstring.h> +#include <vstream.h> +#include <split_at.h> +#include <stringops.h> + +/* Global library. */ + +#include <record.h> +#include <rec_type.h> +#include <cleanup_user.h> +#include <mail_params.h> +#include <lex_822.h> +#include <smtputf8.h> + +/* Application-specific. */ + +#include "cleanup.h" + +#define STR vstring_str + +/* cleanup_out - output one single record */ + +void cleanup_out(CLEANUP_STATE *state, int type, const char *string, ssize_t len) +{ + int err = 0; + + /* + * Long message header lines have to be read and written as multiple + * records. Other header/body content, and envelope data, is copied one + * record at a time. Be sure to not skip a zero-length request. + * + * XXX We don't know if we're writing a message header or not, but that is + * not a problem. A REC_TYPE_NORM or REC_TYPE_CONT record can always be + * chopped up into an equivalent set of REC_TYPE_CONT plus REC_TYPE_NORM + * records. + */ + if (CLEANUP_OUT_OK(state) == 0) + return; + +#define TEXT_RECORD(t) ((t) == REC_TYPE_NORM || (t) == REC_TYPE_CONT) + + if (var_line_limit <= 0) + msg_panic("cleanup_out: bad line length limit: %d", var_line_limit); + do { + if (len > var_line_limit && TEXT_RECORD(type)) { + err = rec_put(state->dst, REC_TYPE_CONT, string, var_line_limit); + string += var_line_limit; + len -= var_line_limit; + } else { + err = rec_put(state->dst, type, string, len); + break; + } + } while (len > 0 && err >= 0); + + if (err < 0) { + if (errno == EFBIG) { + msg_warn("%s: queue file size limit exceeded", + state->queue_id); + state->errs |= CLEANUP_STAT_SIZE; + } else { + msg_warn("%s: write queue file: %m", state->queue_id); + state->errs |= CLEANUP_STAT_WRITE; + } + } +} + +/* cleanup_out_string - output string to one single record */ + +void cleanup_out_string(CLEANUP_STATE *state, int type, const char *string) +{ + cleanup_out(state, type, string, strlen(string)); +} + +/* cleanup_out_format - output one formatted record */ + +void cleanup_out_format(CLEANUP_STATE *state, int type, const char *fmt,...) +{ + static VSTRING *vp; + va_list ap; + + if (vp == 0) + vp = vstring_alloc(100); + va_start(ap, fmt); + vstring_vsprintf(vp, fmt, ap); + va_end(ap); + CLEANUP_OUT_BUF(state, type, vp); +} + +/* cleanup_out_header - output one multi-line header as a bunch of records */ + +void cleanup_out_header(CLEANUP_STATE *state, VSTRING *header_buf) +{ + char *start = vstring_str(header_buf); + char *line; + char *next_line; + ssize_t line_len; + + /* + * Fix 20140711: Auto-detect the presence of a non-ASCII header. + */ + if (var_smtputf8_enable && *STR(header_buf) && !allascii(STR(header_buf))) { + state->smtputf8 |= SMTPUTF8_FLAG_HEADER; + /* Fix 20140713: request SMTPUTF8 support selectively. */ + if (state->flags & CLEANUP_FLAG_AUTOUTF8) + state->smtputf8 |= SMTPUTF8_FLAG_REQUESTED; + } + + /* + * Prepend a tab to continued header lines that went through the address + * rewriting machinery. See cleanup_fold_header(state) below for the form + * of such header lines. NB: This code destroys the header. We could try + * to avoid clobbering it, but we're not going to use the data any + * further. + * + * XXX We prefer to truncate a header at the last line boundary before the + * header size limit. If this would undershoot the limit by more than + * 10%, we truncate between line boundaries to avoid losing too much + * text. This "unkind cut" may result in syntax errors and may trigger + * warnings from down-stream MTAs. + * + * If Milter is enabled, pad a short header record with a dummy record so + * that a header record can safely be overwritten by a pointer record. + * This simplifies header modification enormously. + */ + for (line = start; line; line = next_line) { + next_line = split_at(line, '\n'); + line_len = next_line ? next_line - 1 - line : strlen(line); + if (line + line_len > start + var_header_limit) { + if (line - start > 0.9 * var_header_limit) /* nice cut */ + break; + start[var_header_limit] = 0; /* unkind cut */ + next_line = 0; + } + if (line == start) { + cleanup_out_string(state, REC_TYPE_NORM, line); + if ((state->milters || cleanup_milters) + && line_len < REC_TYPE_PTR_PAYL_SIZE) + rec_pad(state->dst, REC_TYPE_DTXT, + REC_TYPE_PTR_PAYL_SIZE - line_len); + } else if (IS_SPACE_TAB(*line)) { + cleanup_out_string(state, REC_TYPE_NORM, line); + } else { + cleanup_out_format(state, REC_TYPE_NORM, "\t%s", line); + } + } +} |