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Make url_decode() return a pointer to the end of the string, and take a

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char * limit (not a length) to simplify buffer overrun avoidance.
This commit is contained in:
dsl 2004-11-11 21:36:23 +00:00
parent 7d6407147b
commit e4ad2fc0f8
1 changed files with 23 additions and 26 deletions
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49
distrib/utils/sysinst/net.c
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@ -1,4 +1,4 @@
/* $NetBSD: net.c,v 1.103 2004/11/11 21:24:41 dsl Exp $ */
/* $NetBSD: net.c,v 1.104 2004/11/11 21:36:23 dsl Exp $ */
/*
* Copyright 1997 Piermont Information Systems Inc.
@ -86,7 +86,7 @@ static int net_ip6conf;
/* URL encode unsafe characters. */
static char *url_encode (char *dst, const char *src, size_t len,
static char *url_encode (char *dst, const char *src, const char *ep,
const char *safe_chars,
int encode_leading_slash);
@ -172,35 +172,35 @@ static int get_v6wait (void);
#define RFC1738_SAFE_LESS_SHELL_PLUS_SLASH "-_.+!,/"
static char *
url_encode(char *dst, const char *src, size_t len,
url_encode(char *dst, const char *src, const char *ep,
const char *safe_chars, int encode_leading_slash)
{
char *p = dst;
char *ep = dst + len;
int ch;
for (; ep - p > 1; src++) {
ep--;
for (; dst < ep; src++) {
ch = *src & 0xff;
if (ch == 0)
break;
if (safe_chars != NULL &&
(ch != '/' || !encode_leading_slash) &&
(isalnum(ch) || strchr(safe_chars, ch))) {
*p++ = ch;
*dst++ = ch;
} else {
/* encode this char */
if (ep - p < 3)
if (ep - dst < 3)
break;
snprintf(p, ep - p, "%%%02X", ch);
p += 3;
snprintf(dst, ep - dst, "%%%02X", ch);
dst += 3;
}
encode_leading_slash = 0;
}
done:
*p = '\0';
*dst = '\0';
return dst;
}
static const char *ignored_if_names[] = {
"eon", /* netiso */
"gre", /* net */
@ -804,28 +804,25 @@ get_via_ftp(const char *xfer_type)
ftp_user_encoded[0] = 0;
} else {
ftp_opt = "";
url_encode(ftp_user_encoded, ftp_user,
sizeof ftp_user_encoded / 2 - 1,
RFC1738_SAFE_LESS_SHELL, 0),
cp = strchr(ftp_user_encoded, 0);
cp = url_encode(ftp_user_encoded, ftp_user,
ftp_user_encoded + sizeof ftp_user_encoded - 1,
RFC1738_SAFE_LESS_SHELL, 0);
*cp++ = ':';
url_encode(cp, ftp_pass,
sizeof ftp_user_encoded / 2 - 1,
NULL, 0),
cp = strchr(cp, 0);
cp = url_encode(cp, ftp_pass,
ftp_user_encoded + sizeof ftp_user_encoded - 1,
NULL, 0);
*cp++ = '@';
*cp = 0;
}
url_encode(ftp_dir_encoded, ftp_dir,
sizeof ftp_dir_encoded - 1,
RFC1738_SAFE_LESS_SHELL_PLUS_SLASH, 1),
cp = strchr(ftp_dir_encoded, 0);
cp = url_encode(ftp_dir_encoded, ftp_dir,
ftp_dir_encoded + sizeof ftp_dir_encoded - 1,
RFC1738_SAFE_LESS_SHELL_PLUS_SLASH, 1);
if (set_dir[0] != '/')
*cp++ = '/';
url_encode(cp, set_dir,
ftp_dir_encoded + sizeof ftp_dir_encoded - cp,
RFC1738_SAFE_LESS_SHELL_PLUS_SLASH, 0),
ftp_dir_encoded + sizeof ftp_dir_encoded,
RFC1738_SAFE_LESS_SHELL_PLUS_SLASH, 0);
ret = run_program(RUN_DISPLAY | RUN_PROGRESS,
"/usr/bin/ftp %s%s://%s%s/%s/%s%s",