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- /*
- ** kernel/sunos5.c SunOS 5 kernel access functions
- **
- ** This program is in the public domain and may be used freely by anyone
- ** who wants to.
- **
- ** Author: Casper Dik <casper@fwi.uva.nl>
- **
- ** Last update: 21 Apr 1993
- **
- ** Please send bug fixes/bug reports to: Peter Eriksson <pen@lysator.liu.se>
- */
-
-
- #define _KMEMUSER
- #define _KERNEL
-
- /* some definition conflicts. but we must define _KERNEL */
-
- #define exit kernel_exit
- #define strsignal kernel_strsignal
-
- #include <sys/types.h>
- #include <sys/socket.h>
- #include <sys/signal.h>
- #include <sys/param.h>
- #include <netinet/in.h>
-
- #include <stdio.h>
- #include <kvm.h>
- #include <nlist.h>
- #include <math.h>
- #include <sys/fcntl.h>
- #include <sys/cred.h>
- #include <sys/file.h>
- #include <sys/stream.h>
- #include <inet/common.h>
- #include <inet/ip.h>
-
- #undef exit
- #undef strsignal
-
- #include <unistd.h>
- #include <string.h>
- #include <stddef.h>
-
- #include "identd.h"
- #include "error.h"
-
- #define N_FANOUT 0
- #define N_FILE 1
-
- struct nlist nl[] = {
- { "ipc_tcp_fanout" },
- { "file" },
- { 0 },
- };
-
-
- static kvm_t *kd;
-
-
- int k_open()
- {
- /*
- ** Open the kernel memory device
- */
- if (!(kd = kvm_open(path_unix, path_kmem, NULL, O_RDONLY, NULL)))
- ERROR("main: kvm_open");
-
- /*
- ** Extract offsets to the needed variables in the kernel
- */
- if (kvm_nlist(kd, nl) != 0)
- ERROR("main: kvm_nlist");
-
- return 0;
- }
-
-
- /*
- ** Get a piece of kernel memory with error handling.
- ** Returns 1 if call succeeded, else 0 (zero).
- */
- static int getbuf(addr, buf, len, what)
- long addr;
- char *buf;
- int len;
- char *what;
- {
-
- if (kvm_read(kd, addr, buf, len) < 0)
- {
- if (syslog_flag)
- syslog(LOG_ERR, "getbuf: kvm_read(%08x, %d) - %s : %m",
- addr, len, what);
-
- return 0;
- }
-
- return 1;
- }
-
-
- /*
- ** Return the user number for the connection owner
- */
- int k_getuid(faddr, fport, laddr, lport, uid)
- struct in_addr *faddr;
- int fport;
- struct in_addr *laddr;
- int lport;
- int *uid;
- {
- queue_t *qp, *pq, sqr;
- ipc_t ic, *icp;
- unsigned short uslp, usfp;
- unsigned int offset;
- unsigned long fp;
- file_t tf;
- unsigned long zero = 0;
-
- usfp = fport;
- uslp = lport;
-
- offset = usfp ^ uslp;
- offset ^= (unsigned) faddr->S_un.S_un_b.s_b4 ^ (offset >> 8);
- offset %= 256;
-
- if (!getbuf(nl[N_FANOUT].n_value + sizeof(ipc_t *) * offset,
- (char *) &icp,
- sizeof(ipc_t *),
- "ipc_tcp_fanout[offset]"))
- return -1;
-
- if (icp == 0) {
- syslog(LOG_INFO, "k_getuid: Hash miss");
- return -1;
- }
-
- while (icp) {
- if (!getbuf((unsigned long) icp,
- (char *) &ic,
- sizeof(ic),
- "hash entry"))
- return -1;
-
- if (usfp == ic.ipc_tcp_addr[4] && /* remote port */
- uslp == ic.ipc_tcp_addr[5] && /* local port */
- #if 0
- memcmp(&laddr->s_addr, &ic.ipc_tcp_addr[0], 4) == 0 && /* local */
- #else
- (memcmp(&laddr->s_addr, &ic.ipc_tcp_addr[0], 4) == 0 ||
- /* In SunOS 5.3, the local part can be all zeros */
- memcmp(&zero, &ic.ipc_tcp_addr[0], 4) == 0) /* local */ &&
- #endif
- memcmp(&faddr->s_addr, &ic.ipc_tcp_addr[2], 4) == 0)
- break;
- icp = ic.ipc_hash_next;
- }
- if (!icp) {
- syslog(LOG_INFO, "k_getuid: Port not found");
- return -1;
- }
-
- if (!getbuf((unsigned long) ic.ipc_rq+offsetof(queue_t, q_stream),
- (char *) &sqr.q_stream,
- sizeof(sqr.q_stream),
- "queue.q_stream"))
- return -1;
-
- /* at this point sqr.q_stream holds the pointer to the stream we're
- interested in. Now we're going to find the file pointer
- that refers to the vnode that refers to this stream stream */
-
- fp = nl[N_FILE].n_value;
- for (;fp;fp = (unsigned long) tf.f_next) {
- vnode_t vp;
-
- if (!getbuf(fp, (char *) &tf, sizeof(file_t),"file pointer"))
- return -1;
-
- if (!tf.f_vnode)
- continue;
-
- if (!getbuf((unsigned long) tf.f_vnode + offsetof(vnode_t,v_stream),
- (char *) &vp.v_stream,
- sizeof(vp.v_stream),"vnode.v_stream"))
- return -1;
-
- if (vp.v_stream == sqr.q_stream) {
- cred_t cr;
- if (!getbuf((unsigned long) tf.f_cred + offsetof(cred_t, cr_ruid),
- (char *) &cr.cr_ruid,
- sizeof(cr.cr_ruid),
- "cred.cr_ruid"))
- return -1;
- *uid = cr.cr_ruid;
- return 0;
- }
- }
- return -1;
- }
-