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Use the new defines that include the trailing '\0' in the code.

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Replace occurences of the magic constant 2 with an offsetof macro
call that computes the size of the leading members of the sockaddr.
Use strlcpy instead of sprintf where appropriate. Document the new changes
in the man page.
This commit is contained in:
harti 2003-11-14 08:09:01 +00:00
parent 0ccd3f27eb
commit 8d48feb122
4 changed files with 27 additions and 21 deletions
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5
lib/libnetgraph/internal.h
View File

@ -46,6 +46,7 @@
#include <sys/socket.h>
#include <sys/select.h>
#include <sys/linker.h>
#include <stddef.h>
#include <stdlib.h>
#include <stdio.h>
@ -55,6 +56,10 @@
#include <ctype.h>
#include <err.h>
/* the 'sockaddr overhead' for a netgraph address. This is everything before
* the string that constitutes the address. */
#define NGSA_OVERHEAD (offsetof(struct sockaddr_ng, sg_data))
extern int _gNgDebugLevel;
extern void (*_NgLog)(const char *fmt, ...);

13
lib/libnetgraph/msg.c
View File

@ -76,7 +76,7 @@ NgSendMsg(int cs, const char *path,
msg.header.token = gMsgId;
msg.header.flags = NGF_ORIG;
msg.header.cmd = cmd;
snprintf(msg.header.cmdstr, NG_CMDSTRLEN + 1, "cmd%d", cmd);
snprintf(msg.header.cmdstr, NG_CMDSTRSIZ, "cmd%d", cmd);
/* Deliver message */
if (NgDeliverMsg(cs, path, &msg, args, arglen) < 0)
@ -175,7 +175,7 @@ static int
NgDeliverMsg(int cs, const char *path,
const struct ng_mesg *hdr, const void *args, size_t arglen)
{
u_char sgbuf[NG_PATHLEN + 3];
u_char sgbuf[NG_PATHSIZ + NGSA_OVERHEAD];
struct sockaddr_ng *const sg = (struct sockaddr_ng *) sgbuf;
u_char *buf = NULL;
struct ng_mesg *msg;
@ -203,8 +203,9 @@ NgDeliverMsg(int cs, const char *path,
/* Prepare socket address */
sg->sg_family = AF_NETGRAPH;
snprintf(sg->sg_data, NG_PATHLEN + 1, "%s", path);
sg->sg_len = strlen(sg->sg_data) + 3;
/* XXX handle overflow */
strlcpy(sg->sg_data, path, NG_PATHSIZ);
sg->sg_len = strlen(sg->sg_data) + 1 + NGSA_OVERHEAD;
/* Debugging */
if (_gNgDebugLevel >= 2) {
@ -240,7 +241,7 @@ NgDeliverMsg(int cs, const char *path,
int
NgRecvMsg(int cs, struct ng_mesg *rep, size_t replen, char *path)
{
u_char sgbuf[NG_PATHLEN + sizeof(struct sockaddr_ng)];
u_char sgbuf[NG_PATHSIZ + NGSA_OVERHEAD];
struct sockaddr_ng *const sg = (struct sockaddr_ng *) sgbuf;
int len, sglen = sizeof(sgbuf);
int errnosv;
@ -254,7 +255,7 @@ NgRecvMsg(int cs, struct ng_mesg *rep, size_t replen, char *path)
goto errout;
}
if (path != NULL)
snprintf(path, NG_PATHLEN + 1, "%s", sg->sg_data);
strlcpy(path, sg->sg_data, NG_PATHSIZ);
/* Debugging */
if (_gNgDebugLevel >= 2) {

4
lib/libnetgraph/netgraph.3
View File

@ -174,7 +174,7 @@ bytes.
If
.Fa "path"
is non-NULL, it must point to a buffer of at least
.Dv "NG_PATHLEN + 1"
.Dv "NG_PATHSIZ"
bytes, which will be filled in (and NUL terminated) with the path to
the node from which the message was received.
.Pp
@ -216,7 +216,7 @@ and stores it in
which must be large enough to hold the entire packet. If
.Fa "hook"
is non-NULL, it must point to a buffer of at least
.Dv "NG_HOOKLEN + 1"
.Dv "NG_HOOKSIZ"
bytes, which will be filled in (and NUL terminated) with the name of
the hook on which the data was received.
.Pp

26
lib/libnetgraph/sock.c
View File

@ -60,7 +60,7 @@ __FBSDID("$FreeBSD$");
int
NgMkSockNode(const char *name, int *csp, int *dsp)
{
char namebuf[NG_NODELEN + 1];
char namebuf[NG_NODESIZ];
int cs = -1; /* control socket */
int ds = -1; /* data socket */
int errnosv;
@ -93,13 +93,13 @@ NgMkSockNode(const char *name, int *csp, int *dsp)
gotNode:
/* Assign the node the desired name, if any */
if (name != NULL) {
u_char sbuf[NG_NODELEN + 3];
u_char sbuf[NG_NODESIZ + NGSA_OVERHEAD];
struct sockaddr_ng *const sg = (struct sockaddr_ng *) sbuf;
/* Assign name */
snprintf(sg->sg_data, NG_NODELEN + 1, "%s", name);
strlcpy(sg->sg_data, name, NG_NODESIZ);
sg->sg_family = AF_NETGRAPH;
sg->sg_len = strlen(sg->sg_data) + 3;
sg->sg_len = strlen(sg->sg_data) + 1 + NGSA_OVERHEAD;
if (bind(cs, (struct sockaddr *) sg, sg->sg_len) < 0) {
errnosv = errno;
if (_gNgDebugLevel >= 1)
@ -108,7 +108,7 @@ NgMkSockNode(const char *name, int *csp, int *dsp)
}
/* Save node name */
snprintf(namebuf, sizeof(namebuf), "%s", name);
strlcpy(namebuf, name, sizeof(namebuf));
} else if (dsp != NULL) {
u_char rbuf[sizeof(struct ng_mesg) + sizeof(struct nodeinfo)];
struct ng_mesg *const resp = (struct ng_mesg *) rbuf;
@ -135,7 +135,7 @@ NgMkSockNode(const char *name, int *csp, int *dsp)
/* Create data socket if desired */
if (dsp != NULL) {
u_char sbuf[NG_NODELEN + 4];
u_char sbuf[NG_NODESIZ + 1 + NGSA_OVERHEAD];
struct sockaddr_ng *const sg = (struct sockaddr_ng *) sbuf;
/* Create data socket, initially just "floating" */
@ -147,9 +147,9 @@ NgMkSockNode(const char *name, int *csp, int *dsp)
}
/* Associate the data socket with the node */
snprintf(sg->sg_data, NG_NODELEN + 2, "%s:", namebuf);
snprintf(sg->sg_data, NG_NODESIZ + 1, "%s:", namebuf);
sg->sg_family = AF_NETGRAPH;
sg->sg_len = strlen(sg->sg_data) + 3;
sg->sg_len = strlen(sg->sg_data) + 1 + NGSA_OVERHEAD;
if (connect(ds, (struct sockaddr *) sg, sg->sg_len) < 0) {
errnosv = errno;
if (_gNgDebugLevel >= 1)
@ -211,7 +211,7 @@ NgNameNode(int cs, const char *path, const char *fmt, ...)
int
NgRecvData(int ds, u_char * buf, size_t len, char *hook)
{
u_char frombuf[NG_HOOKLEN + sizeof(struct sockaddr_ng)];
u_char frombuf[NG_HOOKSIZ + NGSA_OVERHEAD];
struct sockaddr_ng *const from = (struct sockaddr_ng *) frombuf;
int fromlen = sizeof(frombuf);
int rtn, errnosv;
@ -228,7 +228,7 @@ NgRecvData(int ds, u_char * buf, size_t len, char *hook)
/* Copy hook name */
if (hook != NULL)
snprintf(hook, NG_HOOKLEN + 1, "%s", from->sg_data);
strlcpy(hook, from->sg_data, NG_HOOKSIZ);
/* Debugging */
if (_gNgDebugLevel >= 2) {
@ -250,14 +250,14 @@ NgRecvData(int ds, u_char * buf, size_t len, char *hook)
int
NgSendData(int ds, const char *hook, const u_char * buf, size_t len)
{
u_char sgbuf[NG_HOOKLEN + sizeof(struct sockaddr_ng)];
u_char sgbuf[NG_HOOKSIZ + NGSA_OVERHEAD];
struct sockaddr_ng *const sg = (struct sockaddr_ng *) sgbuf;
int errnosv;
/* Set up destination hook */
sg->sg_family = AF_NETGRAPH;
snprintf(sg->sg_data, NG_HOOKLEN + 1, "%s", hook);
sg->sg_len = strlen(sg->sg_data) + 3;
strlcpy(sg->sg_data, hook, NG_HOOKSIZ);
sg->sg_len = strlen(sg->sg_data) + 1 + NGSA_OVERHEAD;
/* Debugging */
if (_gNgDebugLevel >= 2) {