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Use the new defines that include the trailing '\0' in the code.
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:
Hartmut Brandt
parent
cc512faeb8
commit
54e3311643
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=122649
@ -46,6 +46,7 @@
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#include <sys/socket.h>
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#include <sys/select.h>
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#include <sys/linker.h>
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#include <stddef.h>
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#include <stdlib.h>
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#include <stdio.h>
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@ -55,6 +56,10 @@
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#include <ctype.h>
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#include <err.h>
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/* the 'sockaddr overhead' for a netgraph address. This is everything before
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* the string that constitutes the address. */
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#define NGSA_OVERHEAD (offsetof(struct sockaddr_ng, sg_data))
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extern int _gNgDebugLevel;
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extern void (*_NgLog)(const char *fmt, ...);
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@ -76,7 +76,7 @@ NgSendMsg(int cs, const char *path,
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msg.header.token = gMsgId;
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msg.header.flags = NGF_ORIG;
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msg.header.cmd = cmd;
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snprintf(msg.header.cmdstr, NG_CMDSTRLEN + 1, "cmd%d", cmd);
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snprintf(msg.header.cmdstr, NG_CMDSTRSIZ, "cmd%d", cmd);
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/* Deliver message */
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if (NgDeliverMsg(cs, path, &msg, args, arglen) < 0)
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@ -175,7 +175,7 @@ static int
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NgDeliverMsg(int cs, const char *path,
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const struct ng_mesg *hdr, const void *args, size_t arglen)
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{
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u_char sgbuf[NG_PATHLEN + 3];
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u_char sgbuf[NG_PATHSIZ + NGSA_OVERHEAD];
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struct sockaddr_ng *const sg = (struct sockaddr_ng *) sgbuf;
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u_char *buf = NULL;
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struct ng_mesg *msg;
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@ -203,8 +203,9 @@ NgDeliverMsg(int cs, const char *path,
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/* Prepare socket address */
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sg->sg_family = AF_NETGRAPH;
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snprintf(sg->sg_data, NG_PATHLEN + 1, "%s", path);
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sg->sg_len = strlen(sg->sg_data) + 3;
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/* XXX handle overflow */
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strlcpy(sg->sg_data, path, NG_PATHSIZ);
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sg->sg_len = strlen(sg->sg_data) + 1 + NGSA_OVERHEAD;
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/* Debugging */
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if (_gNgDebugLevel >= 2) {
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@ -240,7 +241,7 @@ NgDeliverMsg(int cs, const char *path,
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int
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NgRecvMsg(int cs, struct ng_mesg *rep, size_t replen, char *path)
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{
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u_char sgbuf[NG_PATHLEN + sizeof(struct sockaddr_ng)];
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u_char sgbuf[NG_PATHSIZ + NGSA_OVERHEAD];
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struct sockaddr_ng *const sg = (struct sockaddr_ng *) sgbuf;
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int len, sglen = sizeof(sgbuf);
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int errnosv;
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@ -254,7 +255,7 @@ NgRecvMsg(int cs, struct ng_mesg *rep, size_t replen, char *path)
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goto errout;
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}
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if (path != NULL)
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snprintf(path, NG_PATHLEN + 1, "%s", sg->sg_data);
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strlcpy(path, sg->sg_data, NG_PATHSIZ);
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/* Debugging */
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if (_gNgDebugLevel >= 2) {
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@ -174,7 +174,7 @@ bytes.
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If
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.Fa "path"
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is non-NULL, it must point to a buffer of at least
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.Dv "NG_PATHLEN + 1"
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.Dv "NG_PATHSIZ"
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bytes, which will be filled in (and NUL terminated) with the path to
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the node from which the message was received.
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.Pp
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@ -216,7 +216,7 @@ and stores it in
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which must be large enough to hold the entire packet. If
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.Fa "hook"
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is non-NULL, it must point to a buffer of at least
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.Dv "NG_HOOKLEN + 1"
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.Dv "NG_HOOKSIZ"
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bytes, which will be filled in (and NUL terminated) with the name of
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the hook on which the data was received.
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.Pp
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@ -60,7 +60,7 @@ __FBSDID("$FreeBSD$");
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int
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NgMkSockNode(const char *name, int *csp, int *dsp)
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{
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char namebuf[NG_NODELEN + 1];
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char namebuf[NG_NODESIZ];
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int cs = -1; /* control socket */
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int ds = -1; /* data socket */
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int errnosv;
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@ -93,13 +93,13 @@ NgMkSockNode(const char *name, int *csp, int *dsp)
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gotNode:
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/* Assign the node the desired name, if any */
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if (name != NULL) {
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u_char sbuf[NG_NODELEN + 3];
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u_char sbuf[NG_NODESIZ + NGSA_OVERHEAD];
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struct sockaddr_ng *const sg = (struct sockaddr_ng *) sbuf;
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/* Assign name */
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snprintf(sg->sg_data, NG_NODELEN + 1, "%s", name);
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strlcpy(sg->sg_data, name, NG_NODESIZ);
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sg->sg_family = AF_NETGRAPH;
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sg->sg_len = strlen(sg->sg_data) + 3;
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sg->sg_len = strlen(sg->sg_data) + 1 + NGSA_OVERHEAD;
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if (bind(cs, (struct sockaddr *) sg, sg->sg_len) < 0) {
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errnosv = errno;
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if (_gNgDebugLevel >= 1)
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@ -108,7 +108,7 @@ NgMkSockNode(const char *name, int *csp, int *dsp)
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}
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/* Save node name */
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snprintf(namebuf, sizeof(namebuf), "%s", name);
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strlcpy(namebuf, name, sizeof(namebuf));
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} else if (dsp != NULL) {
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u_char rbuf[sizeof(struct ng_mesg) + sizeof(struct nodeinfo)];
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struct ng_mesg *const resp = (struct ng_mesg *) rbuf;
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@ -135,7 +135,7 @@ NgMkSockNode(const char *name, int *csp, int *dsp)
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/* Create data socket if desired */
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if (dsp != NULL) {
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u_char sbuf[NG_NODELEN + 4];
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u_char sbuf[NG_NODESIZ + 1 + NGSA_OVERHEAD];
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struct sockaddr_ng *const sg = (struct sockaddr_ng *) sbuf;
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/* Create data socket, initially just "floating" */
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@ -147,9 +147,9 @@ NgMkSockNode(const char *name, int *csp, int *dsp)
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}
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/* Associate the data socket with the node */
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snprintf(sg->sg_data, NG_NODELEN + 2, "%s:", namebuf);
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snprintf(sg->sg_data, NG_NODESIZ + 1, "%s:", namebuf);
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sg->sg_family = AF_NETGRAPH;
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sg->sg_len = strlen(sg->sg_data) + 3;
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sg->sg_len = strlen(sg->sg_data) + 1 + NGSA_OVERHEAD;
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if (connect(ds, (struct sockaddr *) sg, sg->sg_len) < 0) {
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errnosv = errno;
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if (_gNgDebugLevel >= 1)
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@ -211,7 +211,7 @@ NgNameNode(int cs, const char *path, const char *fmt, ...)
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int
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NgRecvData(int ds, u_char * buf, size_t len, char *hook)
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{
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u_char frombuf[NG_HOOKLEN + sizeof(struct sockaddr_ng)];
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u_char frombuf[NG_HOOKSIZ + NGSA_OVERHEAD];
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struct sockaddr_ng *const from = (struct sockaddr_ng *) frombuf;
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int fromlen = sizeof(frombuf);
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int rtn, errnosv;
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@ -228,7 +228,7 @@ NgRecvData(int ds, u_char * buf, size_t len, char *hook)
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/* Copy hook name */
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if (hook != NULL)
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snprintf(hook, NG_HOOKLEN + 1, "%s", from->sg_data);
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strlcpy(hook, from->sg_data, NG_HOOKSIZ);
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/* Debugging */
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if (_gNgDebugLevel >= 2) {
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@ -250,14 +250,14 @@ NgRecvData(int ds, u_char * buf, size_t len, char *hook)
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int
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NgSendData(int ds, const char *hook, const u_char * buf, size_t len)
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{
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u_char sgbuf[NG_HOOKLEN + sizeof(struct sockaddr_ng)];
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u_char sgbuf[NG_HOOKSIZ + NGSA_OVERHEAD];
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struct sockaddr_ng *const sg = (struct sockaddr_ng *) sgbuf;
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int errnosv;
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/* Set up destination hook */
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sg->sg_family = AF_NETGRAPH;
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snprintf(sg->sg_data, NG_HOOKLEN + 1, "%s", hook);
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sg->sg_len = strlen(sg->sg_data) + 3;
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strlcpy(sg->sg_data, hook, NG_HOOKSIZ);
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sg->sg_len = strlen(sg->sg_data) + 1 + NGSA_OVERHEAD;
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/* Debugging */
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if (_gNgDebugLevel >= 2) {
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