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/*
* rfc822.c -- code for slicing and dicing RFC822 mail headers
*
* Copyright 1996 by Eric S. Raymond
* All rights reserved.
* For license terms, see the file COPYING in this directory.
*/
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#if defined(STDC_HEADERS)
#include <stdlib.h>
#endif
#include "fetchmail.h"
#define HEADER_END(p) ((p)[0] == '\n' && ((p)[1] != ' ' && (p)[1] != '\t'))
void reply_hack(buf, host)
/* hack message headers so replies will work properly */
char *buf; /* header to be hacked */
const char *host; /* server hostname */
{
char *from, *cp;
int parendepth, state, has_host_part;
if (strncmp("From: ", buf, 6)
&& strncmp("To: ", buf, 4)
&& strncmp("Reply-", buf, 6)
&& strncmp("Cc: ", buf, 4)
&& strncmp("Bcc: ", buf, 5)) {
return;
}
parendepth = state = 0;
has_host_part = FALSE;
for (from = buf; *from; from++)
{
#ifdef TESTMAIN
printf("state %d: %s", state, buf);
printf("%*s^\n", from - buf + 10, " ");
#endif /* TESTMAIN */
if (state != 2)
if (*from == '(')
++parendepth;
else if (*from == ')')
--parendepth;
if (!parendepth && !has_host_part)
switch (state)
{
case 0: /* before header colon */
if (*from == ':')
state = 1;
break;
case 1: /* we've seen the colon, we're looking for addresses */
if (*from == '<')
state = 3;
else if (*from == '@')
has_host_part = TRUE;
else if (*from == '"')
state = 2;
else if ((*from == ',' || HEADER_END(from)) && !has_host_part)
{
int hostlen;
while (isspace(*from))
--from;
from++;
hostlen = strlen(host);
for (cp = from + strlen(from); cp >= from; --cp)
cp[hostlen+1] = *cp;
*from++ = '@';
memcpy(from, host, hostlen);
from += strlen(from);
has_host_part = TRUE;
}
break;
case 2: /* we're in a string */
if (*from == '"')
state = 1;
break;
case 3: /* we're in a <>-enclosed address */
if (*from == '@')
has_host_part = TRUE;
else if (*from == '>' && !has_host_part)
{
int hostlen;
hostlen = strlen(host);
for (cp = from + strlen(from); cp >= from; --cp)
cp[hostlen+1] = *cp;
*from++ = '@';
memcpy(from, host, hostlen);
from += strlen(from);
has_host_part = TRUE;
}
break;
}
}
}
char *nxtaddr(hdr)
/* parse addresses in succession out of a specified RFC822 header */
const char *hdr; /* header to be parsed, NUL to continue previous hdr */
{
static char *tp, address[POPBUFSIZE+1];
static const char *hp;
static int state, oldstate;
int parendepth;
#define START_HDR 0 /* before header colon */
#define SKIP_JUNK 1 /* skip whitespace, \n, and junk */
#define BARE_ADDRESS 2 /* collecting address without delimiters */
#define INSIDE_DQUOTE 3 /* inside double quotes */
#define INSIDE_PARENS 4 /* inside parentheses */
#define INSIDE_BRACKETS 5 /* inside bracketed address */
#define ENDIT_ALL 6 /* after last address */
if (hdr)
{
hp = hdr;
state = START_HDR;
}
for (; *hp; hp++)
{
#ifdef TESTMAIN
printf("state %d: %s", state, hdr);
printf("%*s^\n", hp - hdr + 10, " ");
#endif /* TESTMAIN */
if (state == ENDIT_ALL) /* after last address */
return(NULL);
else if (HEADER_END(hp))
{
state = ENDIT_ALL;
while (isspace(*--tp))
continue;
*++tp = '\0';
return(tp > address ? (tp = address) : (char *)NULL);
}
else if (*hp == '\\') /* handle RFC822 escaping */
{
*tp++ = *hp++; /* take the escape */
*tp++ = *hp; /* take following char */
}
else switch (state)
{
case START_HDR: /* before header colon */
if (*hp == ':')
{
state = SKIP_JUNK;
tp = address;
}
break;
case SKIP_JUNK: /* looking for address start */
if (*hp == '"') /* quoted string */
{
oldstate = SKIP_JUNK;
state = INSIDE_DQUOTE;
*tp++ = *hp;
}
else if (*hp == '(') /* address comment -- ignore */
{
parendepth = 1;
state = INSIDE_PARENS;
}
else if (*hp == '<') /* begin <address> */
{
state = INSIDE_BRACKETS;
tp = address;
}
else if (!isspace(*hp)) /* ignore space */
{
--hp;
state = BARE_ADDRESS;
}
break;
case BARE_ADDRESS: /* collecting address without delimiters */
if (*hp == ',') /* end of address */
{
if (tp > address)
{
*tp++ = '\0';
state = SKIP_JUNK;
return(tp = address);
}
}
else if (*hp == '(') /* beginning of comment */
{
parendepth = 1;
state = INSIDE_PARENS;
}
else if (*hp == '<') /* beginning of real address */
{
state = INSIDE_BRACKETS;
tp = address;
}
else if (!isspace(*hp)) /* just take it, ignoring whitespace */
*tp++ = *hp;
break;
case INSIDE_DQUOTE: /* we're in a quoted string, copy verbatim */
if (*hp != '"')
*tp++ = *hp;
else
{
*tp++ = *hp;
state = oldstate;
}
break;
case INSIDE_PARENS: /* we're in a parenthesized comment, ignore */
if (*hp == '(')
++parendepth;
else if (*hp == ')')
--parendepth;
if (parendepth == 0)
state = SKIP_JUNK;
break;
case INSIDE_BRACKETS: /* possible <>-enclosed address */
if (*hp == '>') /* end of address */
{
*tp++ = '\0';
state = SKIP_JUNK;
++hp;
return(tp = address);
}
else if (*hp == '<') /* nested <> */
tp = address;
else if (*hp == '"') /* quoted address */
{
*tp++ = *hp;
oldstate = INSIDE_BRACKETS;
state = INSIDE_DQUOTE;
}
else /* just copy address */
*tp++ = *hp;
break;
}
}
return(NULL);
}
#ifdef TESTMAIN
main(int argc, char *argv[])
{
char buf[MSGBUFSIZE], *cp;
int reply = (argc > 1 && !strcmp(argv[1], "-r"));
while (fgets(buf, sizeof(buf)-1, stdin))
{
if (strncmp("From: ", buf, 6)
&& strncmp("To: ", buf, 4)
&& strncmp("Reply-", buf, 6)
&& strncmp("Cc: ", buf, 4)
&& strncmp("Bcc: ", buf, 5))
continue;
else
{
fputs(buf, stdout);
if (reply)
{
reply_hack(buf, "HOSTNAME.NET");
printf("Rewritten buffer: %s", buf);
}
else
if ((cp = nxtaddr(buf)) != (char *)NULL)
do {
printf("\t\"%s\"\n", cp);
} while
((cp = nxtaddr((char *)NULL)) != (char *)NULL);
}
}
}
#endif /* TESTMAIN */
/* rfc822.c end */
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