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Ensure that there's a bit of extra space in our buffer when it's

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passed to libalias.  If there's not enough space, things like ftp
PORT commands start failing....

Reported by: Gianmarco Giovannelli <gmarco@giovannelli.it>
This commit is contained in:
brian 2000-01-03 20:09:23 +00:00
parent 4e3562decb
commit 928cb58803
3 changed files with 26 additions and 2 deletions
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19
usr.sbin/ppp/mbuf.c
View File

@ -234,7 +234,8 @@ m_prepend(struct mbuf *bp, const void *ptr, size_t len, size_t extra)
head = m_get(len + extra, bp ? bp->m_type : MB_UNKNOWN);
head->m_offset = extra;
head->m_len -= extra;
memcpy(MBUF_CTOP(head), ptr, len);
if (ptr)
memcpy(MBUF_CTOP(head), ptr, len);
head->m_next = bp;
return head;
@ -398,3 +399,19 @@ m_settype(struct mbuf *bp, int type)
MemMap[type].octets += bp->m_size;
}
}
struct mbuf *
m_append(struct mbuf *m, const void *v, size_t sz)
{
if (m) {
while (m->m_next)
m = m->m_next;
if (m->m_size - m->m_len > sz)
m->m_len += sz;
else
m->m_next = m_prepend(NULL, v, sz, 0);
} else
m = m_prepend(NULL, v, sz, 0);
return m;
}

1
usr.sbin/ppp/mbuf.h
View File

@ -98,6 +98,7 @@ extern struct mbuf *m_prepend(struct mbuf *, const void *, size_t, size_t);
extern struct mbuf *m_adj(struct mbuf *, ssize_t);
extern struct mbuf *m_pullup(struct mbuf *);
extern void m_settype(struct mbuf *, int);
extern struct mbuf *m_append(struct mbuf *, const void *, size_t);
extern int mbuf_Show(struct cmdargs const *);

8
usr.sbin/ppp/nat_cmd.c
View File

@ -52,6 +52,8 @@
#include "bundle.h"
#define NAT_EXTRABUF (13)
static int StrToAddr(const char *, struct in_addr *);
static int StrToPortRange(const char *, u_short *, u_short *, const char *);
static int StrToAddrAndPort(const char *, struct in_addr *, u_short *,
@ -344,8 +346,10 @@ nat_LayerPush(struct bundle *bundle, struct link *l, struct mbuf *bp,
log_Printf(LogDEBUG, "nat_LayerPush: PROTO_IP -> PROTO_IP\n");
m_settype(bp, MB_NATOUT);
bp = m_pullup(bp);
/* Ensure there's a bit of extra buffer for the NAT code... */
bp = m_pullup(m_append(bp, NULL, NAT_EXTRABUF));
PacketAliasOut(MBUF_CTOP(bp), bp->m_len);
bp->m_len = ntohs(((struct ip *)MBUF_CTOP(bp))->ip_len);
return bp;
}
@ -372,6 +376,8 @@ nat_LayerPull(struct bundle *bundle, struct link *l, struct mbuf *bp,
(pip->ip_p == IPPROTO_IPIP && IN_CLASSD(ntohl(piip->ip_dst.s_addr))))
return bp;
/* Ensure there's a bit of extra buffer for the NAT code... */
bp = m_pullup(m_append(bp, NULL, NAT_EXTRABUF));
ret = PacketAliasIn(MBUF_CTOP(bp), bp->m_len);
bp->m_len = ntohs(pip->ip_len);