Refactor transport sources a bit to facilitate changes coming down pipeline
Add recv callback to transport layer to better facilitate code reuse and readability and for symmetry with send callback. Move recv_dgram and recv_stream to udp_recv and lsock_recv, respectively, and make the beforementioned functions recv callbacks for the udp and lsock transports, respectively. Consolidate the check_priv* functions in their relevant trans*.c source to limit scope/use. Note: this code is roughly based content from the submitter, although this was modified to be more of a direct move from snmpd/main.c to the trans_*.c sources, and to reduce unnecessary static function declarations. MFC after: 2 weeks Submitted by: Thor Steingrimsson <thor.steingrimsson@isilon.com> Sponsored by: Dell EMC Isilon
This commit is contained in:
parent
70a3cc597a
commit
0ba351ef58
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=310586
@ -1024,154 +1024,6 @@ snmp_input_consume(struct port_input *pi)
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pi->length -= pi->consumed;
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}
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static void
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check_priv_dgram(struct port_input *pi, struct sockcred *cred)
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{
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/* process explicitly sends credentials */
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if (cred)
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pi->priv = (cred->sc_euid == 0);
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else
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pi->priv = 0;
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}
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static void
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check_priv_stream(struct port_input *pi)
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{
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struct xucred ucred;
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socklen_t ucredlen;
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/* obtain the accept time credentials */
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ucredlen = sizeof(ucred);
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if (getsockopt(pi->fd, 0, LOCAL_PEERCRED, &ucred, &ucredlen) == 0 &&
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ucredlen >= sizeof(ucred) && ucred.cr_version == XUCRED_VERSION)
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pi->priv = (ucred.cr_uid == 0);
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else
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pi->priv = 0;
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}
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/*
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* Input from a stream socket.
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*/
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static int
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recv_stream(struct port_input *pi)
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{
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struct msghdr msg;
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struct iovec iov[1];
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ssize_t len;
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if (pi->buf == NULL) {
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/* no buffer yet - allocate one */
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if ((pi->buf = buf_alloc(0)) == NULL) {
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/* ups - could not get buffer. Return an error
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* the caller must close the transport. */
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return (-1);
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}
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pi->buflen = buf_size(0);
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pi->consumed = 0;
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pi->length = 0;
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}
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/* try to get a message */
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msg.msg_name = pi->peer;
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msg.msg_namelen = pi->peerlen;
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msg.msg_iov = iov;
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msg.msg_iovlen = 1;
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msg.msg_control = NULL;
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msg.msg_controllen = 0;
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msg.msg_flags = 0;
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iov[0].iov_base = pi->buf + pi->length;
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iov[0].iov_len = pi->buflen - pi->length;
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len = recvmsg(pi->fd, &msg, 0);
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if (len == -1 || len == 0)
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/* receive error */
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return (-1);
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pi->length += len;
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if (pi->cred)
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check_priv_stream(pi);
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return (0);
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}
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/*
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* Input from a datagram socket.
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* Each receive should return one datagram.
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*/
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static int
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recv_dgram(struct port_input *pi, struct in_addr *laddr)
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{
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u_char embuf[1000];
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char cbuf[CMSG_SPACE(SOCKCREDSIZE(CMGROUP_MAX)) +
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CMSG_SPACE(sizeof(struct in_addr))];
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struct msghdr msg;
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struct iovec iov[1];
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ssize_t len;
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struct cmsghdr *cmsg;
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struct sockcred *cred = NULL;
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if (pi->buf == NULL) {
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/* no buffer yet - allocate one */
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if ((pi->buf = buf_alloc(0)) == NULL) {
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/* ups - could not get buffer. Read away input
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* and drop it */
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(void)recvfrom(pi->fd, embuf, sizeof(embuf),
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0, NULL, NULL);
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/* return error */
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return (-1);
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}
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pi->buflen = buf_size(0);
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}
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/* try to get a message */
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msg.msg_name = pi->peer;
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msg.msg_namelen = pi->peerlen;
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msg.msg_iov = iov;
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msg.msg_iovlen = 1;
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memset(cbuf, 0, sizeof(cbuf));
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msg.msg_control = cbuf;
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msg.msg_controllen = sizeof(cbuf);
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msg.msg_flags = 0;
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iov[0].iov_base = pi->buf;
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iov[0].iov_len = pi->buflen;
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len = recvmsg(pi->fd, &msg, 0);
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if (len == -1 || len == 0)
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/* receive error */
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return (-1);
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if (msg.msg_flags & MSG_TRUNC) {
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/* truncated - drop */
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snmpd_stats.silentDrops++;
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snmpd_stats.inTooLong++;
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return (-1);
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}
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pi->length = (size_t)len;
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for (cmsg = CMSG_FIRSTHDR(&msg); cmsg != NULL;
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cmsg = CMSG_NXTHDR(&msg, cmsg)) {
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if (cmsg->cmsg_level == IPPROTO_IP &&
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cmsg->cmsg_type == IP_RECVDSTADDR)
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memcpy(laddr, CMSG_DATA(cmsg), sizeof(struct in_addr));
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if (cmsg->cmsg_level == SOL_SOCKET &&
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cmsg->cmsg_type == SCM_CREDS)
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cred = (struct sockcred *)CMSG_DATA(cmsg);
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}
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if (pi->cred)
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check_priv_dgram(pi, cred);
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return (0);
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}
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/*
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* Input from a socket
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*/
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@ -1191,35 +1043,8 @@ snmpd_input(struct port_input *pi, struct tport *tport)
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#endif
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struct msghdr msg;
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struct iovec iov[1];
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char cbuf[CMSG_SPACE(sizeof(struct in_addr))];
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struct cmsghdr *cmsgp;
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/* get input depending on the transport */
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if (pi->stream) {
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msg.msg_control = NULL;
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msg.msg_controllen = 0;
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ret = recv_stream(pi);
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} else {
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struct in_addr *laddr;
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memset(cbuf, 0, CMSG_SPACE(sizeof(struct in_addr)));
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msg.msg_control = cbuf;
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msg.msg_controllen = CMSG_SPACE(sizeof(struct in_addr));
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cmsgp = CMSG_FIRSTHDR(&msg);
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cmsgp->cmsg_len = CMSG_LEN(sizeof(struct in_addr));
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cmsgp->cmsg_level = IPPROTO_IP;
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cmsgp->cmsg_type = IP_SENDSRCADDR;
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laddr = (struct in_addr *)CMSG_DATA(cmsgp);
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ret = recv_dgram(pi, laddr);
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if (laddr->s_addr == 0) {
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msg.msg_control = NULL;
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msg.msg_controllen = 0;
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}
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}
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ret = tport->transport->vtab->recv(pi);
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if (ret == -1)
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return (-1);
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@ -193,6 +193,7 @@ struct transport_def {
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ssize_t (*send)(struct tport *, const u_char *, size_t,
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const struct sockaddr *, size_t);
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ssize_t (*recv)(struct port_input *);
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};
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struct transport {
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struct asn_oid index; /* transport table index */
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@ -33,6 +33,7 @@
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#include <sys/types.h>
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#include <sys/queue.h>
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#include <sys/stat.h>
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#include <sys/ucred.h>
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#include <sys/un.h>
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#include <errno.h>
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@ -58,6 +59,7 @@ static void lsock_close_port(struct tport *);
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static int lsock_init_port(struct tport *);
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static ssize_t lsock_send(struct tport *, const u_char *, size_t,
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const struct sockaddr *, size_t);
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static ssize_t lsock_recv(struct port_input *);
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/* exported */
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const struct transport_def lsock_trans = {
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@ -67,7 +69,8 @@ const struct transport_def lsock_trans = {
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lsock_stop,
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lsock_close_port,
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lsock_init_port,
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lsock_send
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lsock_send,
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lsock_recv
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};
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static struct transport *my_trans;
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@ -421,6 +424,73 @@ lsock_send(struct tport *tp, const u_char *buf, size_t len,
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return (sendto(peer->input.fd, buf, len, 0, addr, addrlen));
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}
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static void
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check_priv_stream(struct port_input *pi)
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{
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struct xucred ucred;
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socklen_t ucredlen;
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/* obtain the accept time credentials */
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ucredlen = sizeof(ucred);
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if (getsockopt(pi->fd, 0, LOCAL_PEERCRED, &ucred, &ucredlen) == 0 &&
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ucredlen >= sizeof(ucred) && ucred.cr_version == XUCRED_VERSION)
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pi->priv = (ucred.cr_uid == 0);
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else
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pi->priv = 0;
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}
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/*
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* Receive something
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*/
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static ssize_t
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lsock_recv(struct port_input *pi)
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{
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struct msghdr msg;
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struct iovec iov[1];
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ssize_t len;
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msg.msg_control = NULL;
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msg.msg_controllen = 0;
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if (pi->buf == NULL) {
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/* no buffer yet - allocate one */
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if ((pi->buf = buf_alloc(0)) == NULL) {
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/* ups - could not get buffer. Return an error
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* the caller must close the transport. */
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return (-1);
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}
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pi->buflen = buf_size(0);
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pi->consumed = 0;
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pi->length = 0;
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}
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/* try to get a message */
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msg.msg_name = pi->peer;
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msg.msg_namelen = pi->peerlen;
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msg.msg_iov = iov;
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msg.msg_iovlen = 1;
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msg.msg_control = NULL;
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msg.msg_controllen = 0;
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msg.msg_flags = 0;
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iov[0].iov_base = pi->buf + pi->length;
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iov[0].iov_len = pi->buflen - pi->length;
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len = recvmsg(pi->fd, &msg, 0);
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if (len == -1 || len == 0)
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/* receive error */
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return (-1);
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pi->length += len;
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if (pi->cred)
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check_priv_stream(pi);
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return (0);
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}
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/*
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* Dependency to create a lsock port
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*/
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*/
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#include <sys/types.h>
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#include <sys/queue.h>
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#include <sys/ucred.h>
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#include <stdlib.h>
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#include <syslog.h>
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@ -54,6 +55,7 @@ static void udp_close_port(struct tport *);
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static int udp_init_port(struct tport *);
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static ssize_t udp_send(struct tport *, const u_char *, size_t,
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const struct sockaddr *, size_t);
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static ssize_t udp_recv(struct port_input *);
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/* exported */
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const struct transport_def udp_trans = {
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@ -63,7 +65,8 @@ const struct transport_def udp_trans = {
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udp_stop,
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udp_close_port,
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udp_init_port,
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udp_send
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udp_send,
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udp_recv
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};
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static struct transport *my_trans;
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@ -218,6 +221,123 @@ udp_send(struct tport *tp, const u_char *buf, size_t len,
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return (sendto(p->input.fd, buf, len, 0, addr, addrlen));
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}
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static void
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check_priv_dgram(struct port_input *pi, struct sockcred *cred)
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{
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/* process explicitly sends credentials */
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if (cred)
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pi->priv = (cred->sc_euid == 0);
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else
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pi->priv = 0;
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}
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/*
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* Input from a datagram socket.
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* Each receive should return one datagram.
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*/
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static int
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recv_dgram(struct port_input *pi, struct in_addr *laddr)
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{
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u_char embuf[1000];
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char cbuf[CMSG_SPACE(SOCKCREDSIZE(CMGROUP_MAX)) +
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CMSG_SPACE(sizeof(struct in_addr))];
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struct msghdr msg;
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struct iovec iov[1];
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ssize_t len;
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struct cmsghdr *cmsg;
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struct sockcred *cred = NULL;
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if (pi->buf == NULL) {
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/* no buffer yet - allocate one */
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if ((pi->buf = buf_alloc(0)) == NULL) {
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/* ups - could not get buffer. Read away input
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* and drop it */
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(void)recvfrom(pi->fd, embuf, sizeof(embuf),
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0, NULL, NULL);
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/* return error */
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return (-1);
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}
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pi->buflen = buf_size(0);
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}
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/* try to get a message */
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msg.msg_name = pi->peer;
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msg.msg_namelen = pi->peerlen;
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msg.msg_iov = iov;
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msg.msg_iovlen = 1;
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memset(cbuf, 0, sizeof(cbuf));
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msg.msg_control = cbuf;
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msg.msg_controllen = sizeof(cbuf);
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msg.msg_flags = 0;
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iov[0].iov_base = pi->buf;
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iov[0].iov_len = pi->buflen;
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len = recvmsg(pi->fd, &msg, 0);
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if (len == -1 || len == 0)
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/* receive error */
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return (-1);
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if (msg.msg_flags & MSG_TRUNC) {
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/* truncated - drop */
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snmpd_stats.silentDrops++;
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snmpd_stats.inTooLong++;
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return (-1);
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}
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pi->length = (size_t)len;
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for (cmsg = CMSG_FIRSTHDR(&msg); cmsg != NULL;
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cmsg = CMSG_NXTHDR(&msg, cmsg)) {
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if (cmsg->cmsg_level == IPPROTO_IP &&
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cmsg->cmsg_type == IP_RECVDSTADDR)
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memcpy(laddr, CMSG_DATA(cmsg), sizeof(struct in_addr));
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if (cmsg->cmsg_level == SOL_SOCKET &&
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cmsg->cmsg_type == SCM_CREDS)
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cred = (struct sockcred *)CMSG_DATA(cmsg);
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}
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if (pi->cred)
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check_priv_dgram(pi, cred);
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return (0);
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}
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/*
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* Receive something
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*/
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static ssize_t
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udp_recv(struct port_input *pi)
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{
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struct in_addr *laddr;
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struct msghdr msg;
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char cbuf[CMSG_SPACE(sizeof(struct in_addr))];
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struct cmsghdr *cmsgp;
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ssize_t ret;
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memset(cbuf, 0, sizeof(cbuf));
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msg.msg_control = cbuf;
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msg.msg_controllen = sizeof(cbuf);
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cmsgp = CMSG_FIRSTHDR(&msg);
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cmsgp->cmsg_len = CMSG_LEN(sizeof(struct in_addr));
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cmsgp->cmsg_level = IPPROTO_IP;
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cmsgp->cmsg_type = IP_SENDSRCADDR;
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laddr = (struct in_addr *)CMSG_DATA(cmsgp);
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ret = recv_dgram(pi, laddr);
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if (laddr->s_addr == INADDR_ANY) {
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msg.msg_control = NULL;
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msg.msg_controllen = 0;
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}
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return (ret);
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}
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/*
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* Port table
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*/
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