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upas/fs: fix handing of multi-line header fields (thanks theinicke)

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Right now, upasfs exposes header lines as is, without stripping
out new lines. It also documents that it provides one header per
line in the info file.

As a result, when we get a mail with headers that span lines,
our tools get confused.

These split lines are not semantically meaningful. From RFC5322:

  2.2.3.  Long Header Fields

   Each header field is logically a single line of characters comprising
   the field name, the colon, and the field body.  For convenience
   however, and to deal with the 998/78 character limitations per line,
   the field body portion of a header field can be split into a
   multiple-line representation; this is called "folding".  The general
   rule is that wherever this specification allows for folding white
   space (not simply WSP characters), a CRLF may be inserted before any
   WSP.

As a result, to simplify processing, we should just strip out the
line separators when exposing the headers from upasfs.
This commit is contained in:
Ori Bernstein 2020-09-17 16:11:10 -07:00
parent 77b819d585
commit e3166b4fe8
1 changed files with 15 additions and 2 deletions
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17
sys/src/cmd/upas/fs/mbox.c
View file

@ -732,6 +732,19 @@ rtrim(char *p)
return p;
}
static char*
unfold(char *s)
{
char *p, *q;
q = s;
for(p = q; *p != '\0'; p++)
if(*p != '\r' && *p != '\n')
*q++ = *p;
*q = '\0';
return s;
}
static char*
addr822(char *p, char **ac)
{
@ -760,7 +773,7 @@ addr822(char *p, char **ac)
for(p++; c = *p; p++){
if(ac && c == '"')
break;
if(!addrdone && !incomment)
if(!addrdone && !incomment && c != '\r' && c != '\n')
ps = sputc(ps, e, c);
if(!quoted && *p == '"')
break;
@ -883,7 +896,7 @@ replace822(Message *, Header *h, char*, char *p)
static char*
copy822(Message*, Header *h, char*, char *p)
{
return rtrim(strdup(skipwhite(p + h->len)));
return rtrim(unfold(strdup(skipwhite(p + h->len))));
}
static char*