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add support for incomplete headers to copy_msg_convert()

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in the spirit of being liberal about what we accept.

this completely re-structures the header processing loop, with the nice
side effect of eliminating the gotos.

REFMAIL: 87bkyzhoov.fsf@curie.anarc.at
This commit is contained in:
Oswald Buddenhagen 2022-05-03 20:01:29 +02:00
parent ed92816fdb
commit 5b9256f5dc
2 changed files with 161 additions and 44 deletions
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72
src/sync_msg_cvt.c
View File

@ -44,52 +44,82 @@ copy_msg_convert( int in_cr, int out_cr, copy_vars_t *vars )
uint in_len = vars->data.len;
uint idx = 0, sbreak = 0, ebreak = 0, break2 = UINT_MAX;
uint lines = 0, hdr_crs = 0, bdy_crs = 0, app_cr = 0, extra = 0;
uint add_subj = 0;
uint add_subj = 0, fix_tuid = 0, fix_subj = 0, fix_hdr = 0, end_hdr = 0;
if (vars->srec) {
nloop: ;
for (;;) {
uint start = idx;
uint line_cr = 0;
uint got_line = 0;
char pc = 0;
while (idx < in_len) {
char c = in_buf[idx++];
if (c == '\n') {
if (pc == '\r')
line_cr = 1;
got_line = 1;
break;
}
pc = c;
}
if (!ebreak && starts_with_upper( in_buf + start, (int)(in_len - start), "X-TUID: ", 8 )) {
extra = (sbreak = start) - (ebreak = idx);
if (!vars->minimal)
goto oke;
} else {
break;
continue;
}
if (break2 == UINT_MAX && vars->minimal &&
starts_with_upper( in_buf + start, (int)(in_len - start), "SUBJECT:", 8 )) {
break2 = start + 8;
if (break2 < in_len && in_buf[break2] == ' ')
break2++;
}
lines++;
hdr_crs += line_cr;
if (got_line) {
lines++;
if (idx - line_cr - 1 != start)
continue;
// Empty line => end of headers
} else {
// The line is incomplete.
if (pc == '\r')
idx--; // For simplicity, move back before trailing CR
if (idx != start) {
// The line is non-empty, so schedule completing it
fix_hdr = 1;
// ... and put our headers after it. (It would seem easier
// to prepend them, as then we could avoid the fixing - but
// the line might be a continuation. We could also prepend
// it to _all_ pre-exiting headers, but then we would risk
// masking an (incorrectly present) leading 'From ' header.)
start = idx;
}
if (idx - line_cr - 1 == start) {
if (!ebreak)
end_hdr = 1;
}
if (!ebreak) {
sbreak = ebreak = start;
fix_tuid = fix_hdr;
fix_hdr = 0;
}
if (vars->minimal) {
in_len = idx;
if (break2 == UINT_MAX) {
break2 = start;
add_subj = 1;
fix_subj = fix_hdr;
fix_hdr = 0;
}
} else {
fix_hdr = 0;
end_hdr = 0;
}
goto oke;
break;
}
goto nloop;
}
pc = c;
}
free( in_buf );
return "has incomplete header";
oke:
app_cr = out_cr && (!in_cr || hdr_crs);
if (fix_tuid || fix_subj || fix_hdr)
extra += app_cr + 1;
if (end_hdr)
extra += app_cr + 1;
extra += 8 + TUIDL + app_cr + 1;
}
if (out_cr != in_cr) {
@ -157,6 +187,8 @@ copy_msg_convert( int in_cr, int out_cr, copy_vars_t *vars )
}
copy_msg_bytes( &out_buf, in_buf, &idx, sbreak, in_cr, out_cr );
if (fix_tuid)
ADD_NL();
memcpy( out_buf, "X-TUID: ", 8 );
out_buf += 8;
memcpy( out_buf, vars->srec->tuid, TUIDL );
@ -170,6 +202,8 @@ copy_msg_convert( int in_cr, int out_cr, copy_vars_t *vars )
memcpy( out_buf, dummy_pfx, strlen(dummy_pfx) );
out_buf += strlen(dummy_pfx);
} else {
if (fix_subj)
ADD_NL();
memcpy( out_buf, dummy_subj, strlen(dummy_subj) );
out_buf += strlen(dummy_subj);
ADD_NL();
@ -178,8 +212,14 @@ copy_msg_convert( int in_cr, int out_cr, copy_vars_t *vars )
}
copy_msg_bytes( &out_buf, in_buf, &idx, in_len, in_cr, out_cr );
if (vars->minimal)
if (vars->minimal) {
if (end_hdr) {
if (fix_hdr)
ADD_NL();
ADD_NL();
}
memcpy( out_buf, dummy_msg_buf, dummy_msg_len );
}
free( in_buf );
return NULL;

83
src/tst_msg_cvt.c
View File

@ -131,10 +131,13 @@ mintests( const char *name, const char *in, const char *out, int flagged )
}
#define FROM "From: de\rvil\r\n"
#define TO "To: me\r\n"
#define IN_TUID "X-TUID: garbage\r\n"
#define R_TO "To: me"
#define TO R_TO "\r\n"
#define R_IN_TUID "X-TUID: garbage"
#define IN_TUID R_IN_TUID "\r\n"
#define OUT_TUID "X-TUID: " TUID "\r\n"
#define SUBJECT "Subject: hell\r\n"
#define R_SUBJECT "Subject: hell"
#define SUBJECT R_SUBJECT "\r\n"
#define PH_SUBJECT "Subject: [placeholder] hell\r\n"
#define NO_SUBJECT "Subject: [placeholder] (No Subject)\r\n"
#define BODY "\r\nHi,\r\n\r\n...\r\n"
@ -177,5 +180,79 @@ main( void )
scc out_tuid_from_subj_to[] = OUT_TUID FROM PH_SUBJECT TO PH_BODY;
mintests( "tuid / from / subject / to", in_tuid_from_subj_to, out_tuid_from_subj_to, REGULAR );
scc in_from_to_b1[] = FROM TO;
fulltests( "from / to w/o end", in_from_to_b1, in_from_to_b1, AS_IS );
scc out_from_to_b1[] = FROM TO OUT_TUID;
fulltests( "from / to w/o end", in_from_to_b1, out_from_to_b1, ADD_TUID );
scc in_from_tuid_to_b1[] = FROM IN_TUID TO;
scc out_from_tuid_to_b1[] = FROM OUT_TUID TO;
fulltests( "from / tuid / to w/o end", in_from_tuid_to_b1, out_from_tuid_to_b1, ADD_TUID );
scc in_from_to_tuid_b1[] = FROM TO IN_TUID;
scc out_from_to_tuid_b1[] = FROM TO OUT_TUID;
fulltests( "from / to / tuid w/o end", in_from_to_tuid_b1, out_from_to_tuid_b1, ADD_TUID );
mintests( "from / to w/o end", in_from_to_b1, out_from_to_ph, REGULAR );
mintests( "from / tuid / to w/o end", in_from_tuid_to_b1, out_from_tuid_to_ph, REGULAR );
scc in_from_subj_to_b1[] = FROM SUBJECT TO;
mintests( "from / subject / to w/o end", in_from_subj_to_b1, out_from_subj_to, REGULAR );
scc in_from_subj_tuid_to_b1[] = FROM SUBJECT IN_TUID TO;
mintests( "from / subject / tuid / to w/o end", in_from_subj_tuid_to_b1, out_from_subj_tuid_to, REGULAR );
scc in_from_subj_to_tuid_b1[] = FROM SUBJECT TO IN_TUID;
scc out_from_subj_to_tuid_b1[] = FROM PH_SUBJECT TO OUT_TUID PH_BODY;
mintests( "from / subject / to / tuid w/o end", in_from_subj_to_tuid_b1, out_from_subj_to_tuid_b1, REGULAR );
scc in_from_tuid_subj_to_b1[] = FROM IN_TUID SUBJECT TO;
mintests( "from / tuid / subject / to w/o end", in_from_tuid_subj_to_b1, out_from_tuid_subj_to, REGULAR );
scc in_from_tuid_to_subj_b1[] = FROM IN_TUID TO SUBJECT;
scc out_from_tuid_to_subj_b1[] = FROM OUT_TUID TO PH_SUBJECT PH_BODY;
mintests( "from / tuid / to / subject w/o end", in_from_tuid_to_subj_b1, out_from_tuid_to_subj_b1, REGULAR );
scc in_from_to_b2[] = FROM R_TO "\r";
fulltests( "from / to w/o lf", in_from_to_b2, in_from_to_b2, AS_IS );
scc out_from_to_b2[] = FROM TO OUT_TUID "\r";
fulltests( "from / to w/o lf", in_from_to_b2, out_from_to_b2, ADD_TUID );
scc in_from_tuid_to_b2[] = FROM IN_TUID R_TO "\r";
scc out_from_tuid_to_b2[] = FROM OUT_TUID R_TO "\r";
fulltests( "from / tuid / to w/o lf", in_from_tuid_to_b2, out_from_tuid_to_b2, ADD_TUID );
scc in_from_to_tuid_b2[] = FROM TO R_IN_TUID "\r";
fulltests( "from / to / tuid w/o lf", in_from_to_tuid_b2, out_from_to_tuid_b1, ADD_TUID );
mintests( "from / to w/o lf", in_from_to_b2, out_from_to_ph, REGULAR );
mintests( "from / tuid / to w/o lf", in_from_tuid_to_b2, out_from_tuid_to_ph, REGULAR );
scc in_from_subj_to_b2[] = FROM SUBJECT R_TO "\r";
mintests( "from / subject / to w/o lf", in_from_subj_to_b2, out_from_subj_to, REGULAR );
scc in_from_subj_tuid_to_b2[] = FROM SUBJECT IN_TUID R_TO "\r";
mintests( "from / subject / tuid / to w/o lf", in_from_subj_tuid_to_b2, out_from_subj_tuid_to, REGULAR );
scc in_from_subj_to_tuid_b2[] = FROM SUBJECT TO R_IN_TUID "\r";
mintests( "from / subject / to / tuid w/o lf", in_from_subj_to_tuid_b2, out_from_subj_to_tuid_b1, REGULAR );
scc in_from_tuid_subj_to_b2[] = FROM IN_TUID SUBJECT R_TO "\r";
mintests( "from / tuid / subject / to w/o lf", in_from_tuid_subj_to_b2, out_from_tuid_subj_to, REGULAR );
scc in_from_tuid_to_subj_b2[] = FROM IN_TUID TO R_SUBJECT "\r";
mintests( "from / tuid / to / subject w/o lf", in_from_tuid_to_subj_b2, out_from_tuid_to_subj_b1, REGULAR );
scc in_from_to_b3[] = FROM R_TO;
fulltests( "from / to w/o crlf", in_from_to_b3, in_from_to_b3, AS_IS );
fulltests( "from / to w/o crlf", in_from_to_b3, out_from_to_b1, ADD_TUID );
scc in_from_tuid_to_b3[] = FROM IN_TUID R_TO;
scc out_from_tuid_to_b3[] = FROM OUT_TUID R_TO;
fulltests( "from / tuid / to w/o crlf", in_from_tuid_to_b3, out_from_tuid_to_b3, ADD_TUID );
scc in_from_to_tuid_b3[] = FROM TO R_IN_TUID;
fulltests( "from / to / tuid w/o crlf", in_from_to_tuid_b3, out_from_to_tuid_b1, ADD_TUID );
mintests( "from / to w/o crlf", in_from_to_b3, out_from_to_ph, REGULAR );
mintests( "from / tuid / to w/o crlf", in_from_tuid_to_b3, out_from_tuid_to_ph, REGULAR );
scc in_from_subj_to_b3[] = FROM SUBJECT R_TO;
mintests( "from / subject / to w/o crlf", in_from_subj_to_b3, out_from_subj_to, REGULAR );
scc in_from_subj_tuid_to_b3[] = FROM SUBJECT IN_TUID R_TO;
mintests( "from / subject / tuid / to w/o crlf", in_from_subj_tuid_to_b3, out_from_subj_tuid_to, REGULAR );
scc in_from_subj_to_tuid_b3[] = FROM SUBJECT TO R_IN_TUID;
mintests( "from / subject / to / tuid w/o crlf", in_from_subj_to_tuid_b3, out_from_subj_to_tuid_b1, REGULAR );
scc in_from_tuid_subj_to_b3[] = FROM IN_TUID SUBJECT R_TO;
mintests( "from / tuid / subject / to w/o crlf", in_from_tuid_subj_to_b3, out_from_tuid_subj_to, REGULAR );
scc in_from_tuid_to_subj_b3[] = FROM IN_TUID TO R_SUBJECT;
mintests( "from / tuid / to / subject w/o crlf", in_from_tuid_to_subj_b3, out_from_tuid_to_subj_b1, REGULAR );
return 0;
}