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imapparse.c
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imapparse.c
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/*
* Copyright (c) 1994-2008 Carnegie Mellon University. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The name "Carnegie Mellon University" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For permission or any legal
* details, please contact
* Carnegie Mellon University
* Center for Technology Transfer and Enterprise Creation
* 4615 Forbes Avenue
* Suite 302
* Pittsburgh, PA 15213
* (412) 268-7393, fax: (412) 268-7395
* innovation@andrew.cmu.edu
*
* 4. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by Computing Services
* at Carnegie Mellon University (http://www.cmu.edu/computing/)."
*
* CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO
* THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE
* FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
* AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* $Id: imapparse.c,v 1.18 2008/03/24 17:09:17 murch Exp $
*/
#include <config.h>
#include <ctype.h>
#include <string.h>
#include <limits.h>
#include "prot.h"
#include "xmalloc.h"
#include "global.h"
#include "exitcodes.h"
enum {
MAXQUOTED = 32768,
MAXWORD = 32768,
MAXLITERAL = INT_MAX / 20
};
void freebuf(struct buf *buf)
{
if (buf->s) {
free(buf->s);
buf->s = NULL;
}
buf->len = 0;
buf->alloc = 0;
}
/*
* Parse a word
* (token not containing whitespace, parens, or double quotes)
*/
#define BUFGROWSIZE 100
int getword(struct protstream *in, struct buf *buf)
{
int c;
int len = 0;
if (buf->alloc == 0) {
buf->alloc = BUFGROWSIZE;
buf->s = xmalloc(buf->alloc+1);
}
for (;;) {
c = prot_getc(in);
if (c == EOF || isspace(c) || c == '(' || c == ')' || c == '\"') {
buf->s[len] = '\0';
buf->len = len;
return c;
}
if (len == buf->alloc) {
/* xxx limit len */
buf->alloc += BUFGROWSIZE;
buf->s = xrealloc(buf->s, buf->alloc+1);
if (len > MAXWORD) {
fatal("word too long", EC_IOERR);
}
}
buf->s[len++] = c;
}
}
/*
* Parse an xstring
* (astring, nstring or string based on type)
*/
int getxstring(struct protstream *pin, struct protstream *pout,
struct buf *buf, int type)
{
int c;
int i;
int len = 0;
int sawdigit = 0;
int isnowait;
if (buf->alloc == 0) {
buf->alloc = BUFGROWSIZE;
buf->s = xmalloc(buf->alloc+1);
}
c = prot_getc(pin);
switch (c) {
case EOF:
case ' ':
case '(':
case ')':
case '\r':
case '\n':
/* Invalid starting character */
buf->s[0] = '\0';
buf->len = 0;
if (c != EOF) prot_ungetc(c, pin);
return EOF;
case '\"':
/*
* Quoted-string. Server is liberal in accepting qspecials
* other than double-quote, CR, and LF.
*/
for (;;) {
c = prot_getc(pin);
if (c == '\\') {
c = prot_getc(pin);
}
else if (c == '\"') {
buf->s[len] = '\0';
buf->len = len;
return prot_getc(pin);
}
else if (c == EOF || c == '\r' || c == '\n') {
buf->s[len] = '\0';
buf->len = len;
if (c != EOF) prot_ungetc(c, pin);
return EOF;
}
if (len == buf->alloc) {
buf->alloc += BUFGROWSIZE;
buf->s = xrealloc(buf->s, buf->alloc+1);
if (len > MAXQUOTED) {
fatal("word too long", EC_IOERR);
}
}
buf->s[len++] = c;
}
case '{':
if (type == IMAP_QSTRING) {
/* Invalid starting character */
buf->s[0] = '\0';
buf->len = 0;
if (c != EOF) prot_ungetc(c, pin);
return EOF;
}
/* Literal */
isnowait = 0;
buf->s[0] = '\0';
while ((c = prot_getc(pin)) != EOF && isdigit(c)) {
sawdigit = 1;
len = len*10 + c - '0';
if (len > MAXLITERAL || len < 0) {
/* we overflowed */
fatal("literal too big", EC_IOERR);
}
}
if (c == '+') {
isnowait++;
c = prot_getc(pin);
}
if (!sawdigit || c != '}') {
if (c != EOF) prot_ungetc(c, pin);
return EOF;
}
c = prot_getc(pin);
if (c != '\r') {
if (c != EOF) prot_ungetc(c, pin);
return EOF;
}
c = prot_getc(pin);
if (c != '\n') {
if (c != EOF) prot_ungetc(c, pin);
return EOF;
}
/* xxx limit len */
if (len >= buf->alloc) {
buf->alloc = len+1;
buf->s = xrealloc(buf->s, buf->alloc+1);
}
if (!isnowait) {
prot_printf(pout, "+ go ahead\r\n");
prot_flush(pout);
}
for (i = 0; i < len; i++) {
c = prot_getc(pin);
if (c == EOF) {
buf->s[len] = '\0';
buf->len = len;
return EOF;
}
buf->s[i] = c;
}
buf->s[len] = '\0';
buf->len = len;
if (type != IMAP_BIN_ASTRING && (int) strlen(buf->s) != len)
return EOF; /* Disallow imbedded NUL for non IMAP_BIN_ASTRING */
return prot_getc(pin);
default:
switch (type) {
case IMAP_BIN_ASTRING: /* binary-allowed ASTRING */
case IMAP_ASTRING: /* atom, quoted-string or literal */
/*
* Atom -- server is liberal in accepting specials other
* than whitespace, parens, or double quotes
*/
for (;;) {
if (c == EOF || isspace(c) || c == '(' ||
c == ')' || c == '\"') {
buf->s[len] = '\0';
buf->len = len;
return c;
}
if (len == buf->alloc) {
buf->alloc += BUFGROWSIZE;
buf->s = xrealloc(buf->s, buf->alloc+1);
/* xxx limit size of atoms */
}
buf->s[len++] = c;
c = prot_getc(pin);
}
/* never gets here */
break;
case IMAP_NSTRING: /* "NIL", quoted-string or literal */
/*
* Look for "NIL"
*/
if (c == 'N') {
prot_ungetc(c, pin);
c = getword(pin, buf);
if (!strcmp(buf->s, "NIL"))
return c;
}
if (c != EOF) prot_ungetc(c, pin);
return EOF;
break;
case IMAP_QSTRING: /* quoted-string */
case IMAP_STRING: /* quoted-string or literal */
/* atoms aren't acceptable */
if (c != EOF) prot_ungetc(c, pin);
return EOF;
break;
}
}
return EOF;
}
/*
* Eat characters up to and including the next newline
* Also look for and eat non-synchronizing literals.
*/
void eatline(struct protstream *pin, int c)
{
int state = 0;
char *statediagram = " {+}\r";
int size = -1;
for (;;) {
if (c == '\n') return;
if (c == statediagram[state+1]) {
state++;
if (state == 1) size = 0;
else if (c == '\r') {
/* Got a non-synchronizing literal */
c = prot_getc(pin);/* Eat newline */
while (size--) {
c = prot_getc(pin); /* Eat contents */
}
state = 0; /* Go back to scanning for eol */
}
}
else if (state == 1 && isdigit(c)) {
size = size * 10 + c - '0';
}
else state = 0;
c = prot_getc(pin);
if (c == EOF) return;
}
}

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imapparse.c (7 KB)

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