1626 lines
37 KiB
C
1626 lines
37 KiB
C
/*
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* Unix Domain Sockets Implementation (PF_UNIX, PF_LOCAL)
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* This code handles ioctl(2) commands to implement the socket API.
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* Some helper functions are also present.
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*
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* The entry points into this file are...
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*
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* uds_init: initialize the descriptor table.
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* do_accept: handles the accept(2) syscall.
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* do_connect: handles the connect(2) syscall.
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* do_listen: handles the listen(2) syscall.
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* do_socket: handles the socket(2) syscall.
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* do_bind: handles the bind(2) syscall.
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* do_getsockname: handles the getsockname(2) syscall.
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* do_getpeername: handles the getpeername(2) syscall.
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* do_shutdown: handles the shutdown(2) syscall.
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* do_socketpair: handles the socketpair(2) syscall.
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* do_getsockopt_sotype: handles the getsockopt(2) syscall.
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* do_getsockopt_peercred: handles the getsockopt(2) syscall.
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* do_getsockopt_sndbuf: handles the getsockopt(2) syscall.
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* do_setsockopt_sndbuf: handles the setsockopt(2) syscall.
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* do_getsockopt_rcvbuf: handles the getsockopt(2) syscall.
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* do_setsockopt_rcvbuf: handles the setsockopt(2) syscall.
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* do_sendto: handles the sendto(2) syscall.
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* do_recvfrom: handles the recvfrom(2) syscall.
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* do_sendmsg: handles the sendmsg(2) syscall.
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* do_recvmsg: handles the recvmsg(2) syscall.
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* perform_connection: performs the connection of two descriptors.
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* clear_fds: calls put_filp for undelivered FDs.
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*
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* Also see...
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*
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* table.c, dev_uds.c, uds.h
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*/
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#define DEBUG 0
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#include "inc.h"
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#include "const.h"
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#include "glo.h"
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#include "uds.h"
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/* File Descriptor Table */
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uds_fd_t uds_fd_table[NR_FDS];
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/* initialize the descriptor table */
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PUBLIC void uds_init(void)
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{
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/*
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* Setting everything to NULL implicitly sets the
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* state to UDS_FREE.
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*/
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memset(uds_fd_table, '\0', sizeof(uds_fd_t) * NR_FDS);
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}
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/* check the permissions of a socket file */
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PRIVATE int check_perms(int minor, struct sockaddr_un *addr)
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{
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int rc;
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message vfs_m;
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cp_grant_id_t grant_id;
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grant_id = cpf_grant_direct(VFS_PROC_NR, (vir_bytes) addr->sun_path,
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UNIX_PATH_MAX, CPF_READ | CPF_WRITE);
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/* ask the VFS to verify the permissions */
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memset(&vfs_m, '\0', sizeof(message));
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vfs_m.m_type = PFS_REQ_CHECK_PERMS;
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vfs_m.USER_ENDPT = uds_fd_table[minor].owner;
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vfs_m.IO_GRANT = (char *) grant_id;
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vfs_m.COUNT = UNIX_PATH_MAX;
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rc = sendrec(VFS_PROC_NR, &vfs_m);
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cpf_revoke(grant_id);
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if (OK != rc) {
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printf("(uds) sendrec error... req_nr: %d err: %d\n",
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vfs_m.m_type, rc);
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return EIO;
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}
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#if DEBUG == 1
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printf("(uds) VFS reply => %d\n", vfs_m.m_type);
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printf("(uds) Canonical Path => %s\n", addr->sun_path);
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#endif
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return vfs_m.m_type; /* return reply code OK, ELOOP, etc. */
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}
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PRIVATE filp_id_t verify_fd(endpoint_t ep, int fd)
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{
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int rc;
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message vfs_m;
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#if DEBUG == 1
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static int call_count = 0;
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printf("(uds) verify_fd(%d,%d) call_count=%d\n", ep, fd,
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++call_count);
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#endif
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memset(&vfs_m, '\0', sizeof(message));
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vfs_m.m_type = PFS_REQ_VERIFY_FD;
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vfs_m.USER_ENDPT = ep;
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vfs_m.COUNT = fd;
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rc = sendrec(VFS_PROC_NR, &vfs_m);
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if (OK != rc) {
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printf("(uds) sendrec error... req_nr: %d err: %d\n",
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vfs_m.m_type, rc);
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return NULL;
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}
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#if DEBUG == 1
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printf("(uds) VFS reply => %d\n", vfs_m.m_type);
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#endif
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return vfs_m.ADDRESS;
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}
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PRIVATE int set_filp(filp_id_t sfilp)
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{
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int rc;
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message vfs_m;
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#if DEBUG == 1
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static int call_count = 0;
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printf("(uds) set_filp(0x%x) call_count=%d\n", sfilp, ++call_count);
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#endif
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memset(&vfs_m, '\0', sizeof(message));
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vfs_m.m_type = PFS_REQ_SET_FILP;
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vfs_m.ADDRESS = sfilp;
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rc = sendrec(VFS_PROC_NR, &vfs_m);
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if (OK != rc) {
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printf("(uds) sendrec error... req_nr: %d err: %d\n",
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vfs_m.m_type, rc);
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return EIO;
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}
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#if DEBUG == 1
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printf("(uds) VFS reply => %d\n", vfs_m.m_type);
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#endif
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return vfs_m.m_type; /* return reply code OK, ELOOP, etc. */
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}
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PRIVATE int copy_filp(endpoint_t to_ep, filp_id_t cfilp)
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{
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int rc;
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message vfs_m;
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#if DEBUG == 1
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static int call_count = 0;
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printf("(uds) copy_filp(%d, 0x%x) call_count=%d\n",to_ep, cfilp,
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++call_count);
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#endif
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memset(&vfs_m, '\0', sizeof(message));
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vfs_m.m_type = PFS_REQ_COPY_FILP;
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vfs_m.USER_ENDPT = to_ep;
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vfs_m.ADDRESS = cfilp;
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rc = sendrec(VFS_PROC_NR, &vfs_m);
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if (OK != rc) {
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printf("(uds) sendrec error... req_nr: %d err: %d\n",
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vfs_m.m_type, rc);
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return EIO;
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}
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#if DEBUG == 1
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printf("(uds) VFS reply => %d\n", vfs_m.m_type);
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#endif
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return vfs_m.m_type;
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}
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PRIVATE int put_filp(filp_id_t pfilp)
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{
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int rc;
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message vfs_m;
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#if DEBUG == 1
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static int call_count = 0;
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printf("(uds) put_filp(0x%x) call_count=%d\n", pfilp, ++call_count);
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#endif
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memset(&vfs_m, '\0', sizeof(message));
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vfs_m.m_type = PFS_REQ_PUT_FILP;
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vfs_m.ADDRESS = pfilp;
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rc = sendrec(VFS_PROC_NR, &vfs_m);
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if (OK != rc) {
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printf("(uds) sendrec error... req_nr: %d err: %d\n",
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vfs_m.m_type, rc);
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return EIO;
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}
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#if DEBUG == 1
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printf("(uds) VFS reply => %d\n", vfs_m.m_type);
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#endif
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return vfs_m.m_type; /* return reply code OK, ELOOP, etc. */
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}
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PRIVATE int cancel_fd(endpoint_t ep, int fd)
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{
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int rc;
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message vfs_m;
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#if DEBUG == 1
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static int call_count = 0;
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printf("(uds) cancel_fd(%d,%d) call_count=%d\n", ep, fd, ++call_count);
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#endif
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memset(&vfs_m, '\0', sizeof(message));
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vfs_m.m_type = PFS_REQ_CANCEL_FD;
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vfs_m.USER_ENDPT = ep;
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vfs_m.COUNT = fd;
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rc = sendrec(VFS_PROC_NR, &vfs_m);
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if (OK != rc) {
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printf("(uds) sendrec error... req_nr: %d err: %d\n",
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vfs_m.m_type, rc);
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return EIO;
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}
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#if DEBUG == 1
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printf("(uds) VFS reply => %d\n", vfs_m.m_type);
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#endif
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return vfs_m.m_type; /* return reply code OK, ELOOP, etc. */
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}
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PUBLIC int perform_connection(message *dev_m_in, message *dev_m_out,
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struct sockaddr_un *addr, int minorx, int minory)
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{
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/* there are several places were a connection is established. */
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/* accept(2), connect(2), uds_status(2), socketpair(2) */
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/* This is a helper function to make sure it is done in the */
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/* same way in each place with the same validation checks. */
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#if DEBUG == 1
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static int call_count = 0;
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printf("(uds) [%d] perform_connection() call_count=%d\n",
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uds_minor(dev_m_in), ++call_count);
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#endif
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/* only connection oriented types are acceptable and only like
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* types can connect to each other
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*/
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if ((uds_fd_table[minorx].type != SOCK_SEQPACKET &&
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uds_fd_table[minorx].type != SOCK_STREAM) ||
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uds_fd_table[minorx].type != uds_fd_table[minory].type) {
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/* sockets are not in a valid state */
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return EINVAL;
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}
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/* connect the pair of sockets */
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uds_fd_table[minorx].peer = minory;
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uds_fd_table[minory].peer = minorx;
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/* Set the address of both sockets */
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memcpy(&(uds_fd_table[minorx].addr), addr, sizeof(struct sockaddr_un));
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memcpy(&(uds_fd_table[minory].addr), addr, sizeof(struct sockaddr_un));
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return OK;
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}
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PUBLIC int do_accept(message *dev_m_in, message *dev_m_out)
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{
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int minor;
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int minorparent; /* minor number of parent (server) */
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int minorpeer;
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int rc, i;
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struct sockaddr_un addr;
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#if DEBUG == 1
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static int call_count = 0;
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printf("(uds) [%d] do_accept() call_count=%d\n",
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uds_minor(dev_m_in), ++call_count);
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#endif
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/* Somewhat weird logic is used in this function, so here's an
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* overview... The minor number is the server's client socket
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* (the socket to be returned by accept()). The data waiting
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* for us in the IO Grant is the address that the server is
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* listening on. This function uses the address to find the
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* server's descriptor. From there we can perform the
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* connection or suspend and wait for a connect().
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*/
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minor = uds_minor(dev_m_in);
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if (uds_fd_table[minor].type != -1) {
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/* this IOCTL must be called on a 'fresh' socket */
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return EINVAL;
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}
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/* Get the server's address */
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rc = sys_safecopyfrom(VFS_PROC_NR, (cp_grant_id_t) dev_m_in->IO_GRANT,
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(vir_bytes) 0, (vir_bytes) &addr, sizeof(struct sockaddr_un),
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D);
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if (rc != OK) {
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return EIO;
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}
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/* locate server socket */
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rc = -1; /* to trap error */
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for (i = 0; i < NR_FDS; i++) {
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if (uds_fd_table[i].addr.sun_family == AF_UNIX &&
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!strncmp(addr.sun_path,
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uds_fd_table[i].addr.sun_path,
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UNIX_PATH_MAX) &&
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uds_fd_table[i].listening == 1) {
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rc = 0;
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break;
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}
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}
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if (rc == -1) {
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/* there is no server listening on addr. Maybe someone
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* screwed up the ioctl()?
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*/
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return EINVAL;
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}
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minorparent = i; /* parent */
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/* we are the parent's child */
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uds_fd_table[minorparent].child = minor;
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/* the peer has the same type as the parent. we need to be that
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* type too.
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*/
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uds_fd_table[minor].type = uds_fd_table[minorparent].type;
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/* locate peer to accept in the parent's backlog */
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minorpeer = -1; /* to trap error */
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for (i = 0; i < uds_fd_table[minorparent].backlog_size; i++) {
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if (uds_fd_table[minorparent].backlog[i] != -1) {
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minorpeer = uds_fd_table[minorparent].backlog[i];
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uds_fd_table[minorparent].backlog[i] = -1;
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rc = 0;
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break;
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}
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}
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if (minorpeer == -1) {
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#if DEBUG == 1
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printf("(uds) [%d] {do_accept} suspend\n", minor);
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#endif
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/* there are no peers in the backlog, suspend and wait
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* for some to show up
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*/
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uds_fd_table[minor].suspended = UDS_SUSPENDED_ACCEPT;
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return SUSPEND;
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}
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#if DEBUG == 1
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printf("(uds) [%d] connecting to %d -- parent is %d\n", minor,
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minorpeer, minorparent);
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#endif
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rc = perform_connection(dev_m_in, dev_m_out, &addr, minor, minorpeer);
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if (rc != OK) {
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#if DEBUG == 1
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printf("(uds) [%d] {do_accept} connection not performed\n",
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minor);
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#endif
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return rc;
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}
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|
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uds_fd_table[minorparent].child = -1;
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|
|
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/* if peer is blocked on connect() revive peer */
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if (uds_fd_table[minorpeer].suspended) {
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#if DEBUG == 1
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printf("(uds) [%d] {do_accept} revive %d\n", minor,
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minorpeer);
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#endif
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uds_fd_table[minorpeer].ready_to_revive = 1;
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notify(dev_m_in->m_source);
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}
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return OK;
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}
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|
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PUBLIC int do_connect(message *dev_m_in, message *dev_m_out)
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{
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int minor;
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struct sockaddr_un addr;
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int rc, i, j;
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|
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#if DEBUG == 1
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static int call_count = 0;
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printf("(uds) [%d] do_connect() call_count=%d\n", uds_minor(dev_m_in),
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++call_count);
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#endif
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minor = uds_minor(dev_m_in);
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|
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/* only connection oriented sockets can connect */
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if (uds_fd_table[minor].type != SOCK_STREAM &&
|
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uds_fd_table[minor].type != SOCK_SEQPACKET) {
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return EINVAL;
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}
|
|
|
|
if (uds_fd_table[minor].peer != -1) {
|
|
/* socket is already connected */
|
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return EISCONN;
|
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}
|
|
|
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rc = sys_safecopyfrom(VFS_PROC_NR, (cp_grant_id_t) dev_m_in->IO_GRANT,
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(vir_bytes) 0, (vir_bytes) &addr,
|
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sizeof(struct sockaddr_un), D);
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|
|
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if (rc != OK) {
|
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return EIO;
|
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}
|
|
|
|
rc = check_perms(minor, &addr);
|
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if (rc != OK) {
|
|
/* permission denied, socket file doesn't exist, etc. */
|
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return rc;
|
|
}
|
|
|
|
/* look for a socket of the same type that is listening on the
|
|
* address we want to connect to
|
|
*/
|
|
for (i = 0; i < NR_FDS; i++) {
|
|
|
|
if (uds_fd_table[minor].type == uds_fd_table[i].type &&
|
|
uds_fd_table[i].listening &&
|
|
uds_fd_table[i].addr.sun_family == AF_UNIX &&
|
|
!strncmp(addr.sun_path, uds_fd_table[i].addr.sun_path,
|
|
UNIX_PATH_MAX)) {
|
|
|
|
if (uds_fd_table[i].child != -1) {
|
|
|
|
/* the server is blocked on accept(2) --
|
|
* perform connection to the child
|
|
*/
|
|
|
|
rc = perform_connection(dev_m_in, dev_m_out,
|
|
&addr, minor, uds_fd_table[i].child);
|
|
|
|
if (rc == OK) {
|
|
|
|
uds_fd_table[i].child = -1;
|
|
|
|
#if DEBUG == 1
|
|
printf("(uds) [%d] {do_connect} revive %d\n", minor, i);
|
|
#endif
|
|
|
|
/* wake the parent (server) */
|
|
uds_fd_table[i].ready_to_revive = 1;
|
|
notify(dev_m_in->m_source);
|
|
}
|
|
|
|
return rc;
|
|
|
|
} else {
|
|
|
|
#if DEBUG == 1
|
|
printf("(uds) [%d] adding to %d's backlog\n",
|
|
minor, i);
|
|
#endif
|
|
|
|
/* tell the server were waiting to be served */
|
|
|
|
/* look for a free slot in the backlog */
|
|
rc = -1; /* to trap error */
|
|
for (j = 0; j < uds_fd_table[i].backlog_size;
|
|
j++) {
|
|
|
|
if (uds_fd_table[i].backlog[j] == -1) {
|
|
|
|
uds_fd_table[i].backlog[j] =
|
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minor;
|
|
|
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rc = 0;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (rc == -1) {
|
|
|
|
/* backlog is full */
|
|
break;
|
|
}
|
|
|
|
/* see if the server is blocked on select() */
|
|
if (uds_fd_table[i].selecting == 1) {
|
|
|
|
/* if the server wants to know
|
|
* about data ready to read and
|
|
* it doesn't know about it
|
|
* already, then let the server
|
|
* know we have data for it.
|
|
*/
|
|
if ((uds_fd_table[i].sel_ops_in &
|
|
SEL_RD) &&
|
|
!(uds_fd_table[i].sel_ops_out &
|
|
SEL_RD)) {
|
|
|
|
uds_fd_table[i].sel_ops_out |=
|
|
SEL_RD;
|
|
|
|
uds_fd_table[i].status_updated
|
|
= 1;
|
|
|
|
notify(
|
|
uds_fd_table[i].select_proc
|
|
);
|
|
}
|
|
}
|
|
|
|
/* we found our server */
|
|
uds_fd_table[minor].peer = i;
|
|
|
|
/* set the address */
|
|
memcpy(&(uds_fd_table[minor].addr), &addr,
|
|
sizeof(struct sockaddr_un));
|
|
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (uds_fd_table[minor].peer == -1) {
|
|
/* could not find another open socket listening on the
|
|
* specified address with room in the backlog
|
|
*/
|
|
return ECONNREFUSED;
|
|
}
|
|
|
|
#if DEBUG == 1
|
|
printf("(uds) [%d] {do_connect} suspend\n", minor);
|
|
#endif
|
|
|
|
/* suspend until the server side completes the connection with accept()
|
|
*/
|
|
|
|
uds_fd_table[minor].suspended = UDS_SUSPENDED_CONNECT;
|
|
|
|
return SUSPEND;
|
|
}
|
|
|
|
PUBLIC int do_listen(message *dev_m_in, message *dev_m_out)
|
|
{
|
|
int minor;
|
|
int rc;
|
|
int backlog_size;
|
|
|
|
#if DEBUG == 1
|
|
static int call_count = 0;
|
|
printf("(uds) [%d] do_listen() call_count=%d\n", uds_minor(dev_m_in),
|
|
++call_count);
|
|
#endif
|
|
|
|
minor = uds_minor(dev_m_in);
|
|
|
|
/* ensure the socket has a type and is bound */
|
|
if (uds_fd_table[minor].type == -1 ||
|
|
uds_fd_table[minor].addr.sun_family != AF_UNIX) {
|
|
|
|
/* probably trying to call listen() before bind() */
|
|
return EINVAL;
|
|
}
|
|
|
|
/* the two supported types for listen(2) are SOCK_STREAM and
|
|
* SOCK_SEQPACKET
|
|
*/
|
|
if (uds_fd_table[minor].type != SOCK_STREAM &&
|
|
uds_fd_table[minor].type != SOCK_SEQPACKET) {
|
|
|
|
/* probably trying to call listen() with a SOCK_DGRAM */
|
|
return EOPNOTSUPP;
|
|
}
|
|
|
|
/* The POSIX standard doesn't say what to do if listen() has
|
|
* already been called. Well, there isn't an errno. we silently
|
|
* let it happen, but if listen() has already been called, we
|
|
* don't allow the backlog to shrink
|
|
*/
|
|
rc = sys_safecopyfrom(VFS_PROC_NR, (cp_grant_id_t) dev_m_in->IO_GRANT,
|
|
(vir_bytes) 0, (vir_bytes) &backlog_size, sizeof(int), D);
|
|
|
|
if (rc != OK) {
|
|
return EIO;
|
|
}
|
|
|
|
if (uds_fd_table[minor].listening == 0) {
|
|
|
|
/* See if backlog_size is between 0 and UDS_SOMAXCONN */
|
|
if (backlog_size >= 0 && backlog_size < UDS_SOMAXCONN) {
|
|
|
|
/* use the user provided backlog_size */
|
|
uds_fd_table[minor].backlog_size = backlog_size;
|
|
|
|
} else {
|
|
|
|
/* the user gave an invalid size, use
|
|
* UDS_SOMAXCONN instead
|
|
*/
|
|
uds_fd_table[minor].backlog_size = UDS_SOMAXCONN;
|
|
}
|
|
} else {
|
|
|
|
/* See if the user is trying to expand the backlog_size */
|
|
if (backlog_size > uds_fd_table[minor].backlog_size &&
|
|
backlog_size < UDS_SOMAXCONN) {
|
|
|
|
/* expand backlog_size */
|
|
uds_fd_table[minor].backlog_size = backlog_size;
|
|
}
|
|
|
|
/* Don't let the user shrink the backlog_size (we might
|
|
* have clients waiting in those slots
|
|
*/
|
|
}
|
|
|
|
/* perform listen(2) */
|
|
uds_fd_table[minor].listening = 1;
|
|
|
|
return OK;
|
|
}
|
|
|
|
PUBLIC int do_socket(message *dev_m_in, message *dev_m_out)
|
|
{
|
|
int rc;
|
|
int minor;
|
|
|
|
#if DEBUG == 1
|
|
static int call_count = 0;
|
|
printf("(uds) [%d] do_socket() call_count=%d\n", uds_minor(dev_m_in),
|
|
++call_count);
|
|
#endif
|
|
|
|
minor = uds_minor(dev_m_in);
|
|
|
|
/* see if this socket already has a type */
|
|
if (uds_fd_table[minor].type != -1) {
|
|
/* socket type can only be set once */
|
|
return EINVAL;
|
|
}
|
|
|
|
/* get the requested type */
|
|
rc = sys_safecopyfrom(VFS_PROC_NR, (cp_grant_id_t) dev_m_in->IO_GRANT,
|
|
(vir_bytes) 0, (vir_bytes) &(uds_fd_table[minor].type),
|
|
sizeof(int), D);
|
|
|
|
if (rc != OK) {
|
|
|
|
/* something went wrong and we couldn't get the type */
|
|
return EIO;
|
|
}
|
|
|
|
/* validate the type */
|
|
switch (uds_fd_table[minor].type) {
|
|
case SOCK_STREAM:
|
|
case SOCK_DGRAM:
|
|
case SOCK_SEQPACKET:
|
|
|
|
/* the type is one of the 3 valid socket types */
|
|
return OK;
|
|
|
|
default:
|
|
|
|
/* if the type isn't one of the 3 valid socket
|
|
* types, then it must be invalid.
|
|
*/
|
|
|
|
/* set the type back to '-1' (no type set) */
|
|
uds_fd_table[minor].type = -1;
|
|
|
|
return EINVAL;
|
|
}
|
|
}
|
|
|
|
PUBLIC int do_bind(message *dev_m_in, message *dev_m_out)
|
|
{
|
|
int minor;
|
|
struct sockaddr_un addr;
|
|
int rc, i;
|
|
|
|
#if DEBUG == 1
|
|
static int call_count = 0;
|
|
printf("(uds) [%d] do_bind() call_count=%d\n", uds_minor(dev_m_in),
|
|
++call_count);
|
|
#endif
|
|
|
|
minor = uds_minor(dev_m_in);
|
|
|
|
if ((uds_fd_table[minor].type == -1) ||
|
|
(uds_fd_table[minor].addr.sun_family == AF_UNIX &&
|
|
uds_fd_table[minor].type != SOCK_DGRAM)) {
|
|
|
|
/* the type hasn't been set by do_socket() yet OR attempting
|
|
* to re-bind() a non-SOCK_DGRAM socket
|
|
*/
|
|
return EINVAL;
|
|
}
|
|
|
|
rc = sys_safecopyfrom(VFS_PROC_NR, (cp_grant_id_t) dev_m_in->IO_GRANT,
|
|
(vir_bytes) 0, (vir_bytes) &addr, sizeof(struct sockaddr_un),
|
|
D);
|
|
|
|
if (rc != OK) {
|
|
return EIO;
|
|
}
|
|
|
|
/* do some basic sanity checks on the address */
|
|
if (addr.sun_family != AF_UNIX) {
|
|
|
|
/* bad family */
|
|
return EAFNOSUPPORT;
|
|
}
|
|
|
|
if (addr.sun_path[0] == '\0') {
|
|
|
|
/* bad address */
|
|
return ENOENT;
|
|
}
|
|
|
|
rc = check_perms(minor, &addr);
|
|
if (rc != OK) {
|
|
/* permission denied, socket file doesn't exist, etc. */
|
|
return rc;
|
|
}
|
|
|
|
/* make sure the address isn't already in use by another socket. */
|
|
for (i = 0; i < NR_FDS; i++) {
|
|
if ((uds_fd_table[i].addr.sun_family == AF_UNIX) &&
|
|
!strncmp(addr.sun_path,
|
|
uds_fd_table[i].addr.sun_path, UNIX_PATH_MAX)) {
|
|
|
|
/* another socket is bound to this sun_path */
|
|
return EADDRINUSE;
|
|
}
|
|
}
|
|
|
|
/* looks good, perform the bind() */
|
|
memcpy(&(uds_fd_table[minor].addr), &addr, sizeof(struct sockaddr_un));
|
|
|
|
return OK;
|
|
}
|
|
|
|
PUBLIC int do_getsockname(message *dev_m_in, message *dev_m_out)
|
|
{
|
|
int minor;
|
|
int rc;
|
|
|
|
#if DEBUG == 1
|
|
static int call_count = 0;
|
|
printf("(uds) [%d] do_getsockname() call_count=%d\n",
|
|
uds_minor(dev_m_in), ++call_count);
|
|
#endif
|
|
|
|
minor = uds_minor(dev_m_in);
|
|
|
|
/* Unconditionally send the address we have assigned to this socket.
|
|
* The POSIX standard doesn't say what to do if the address
|
|
* hasn't been set. If the address isn't currently set, then
|
|
* the user will get NULL bytes. Note: libc depends on this
|
|
* behavior.
|
|
*/
|
|
rc = sys_safecopyto(VFS_PROC_NR, (cp_grant_id_t) dev_m_in->IO_GRANT,
|
|
(vir_bytes) 0, (vir_bytes) &(uds_fd_table[minor].addr),
|
|
sizeof(struct sockaddr_un), D);
|
|
|
|
return rc ? EIO : OK;
|
|
}
|
|
|
|
PUBLIC int do_getpeername(message *dev_m_in, message *dev_m_out)
|
|
{
|
|
int minor;
|
|
int rc;
|
|
|
|
#if DEBUG == 1
|
|
static int call_count = 0;
|
|
printf("(uds) [%d] do_getpeername() call_count=%d\n",
|
|
uds_minor(dev_m_in), ++call_count);
|
|
#endif
|
|
|
|
minor = uds_minor(dev_m_in);
|
|
|
|
/* check that the socket is connected with a valid peer */
|
|
if (uds_fd_table[minor].peer != -1) {
|
|
int peer_minor;
|
|
|
|
peer_minor = uds_fd_table[minor].peer;
|
|
|
|
/* copy the address from the peer */
|
|
rc = sys_safecopyto(VFS_PROC_NR,
|
|
(cp_grant_id_t) dev_m_in->IO_GRANT, (vir_bytes) 0,
|
|
(vir_bytes) &(uds_fd_table[peer_minor].addr),
|
|
sizeof(struct sockaddr_un), D);
|
|
|
|
return rc ? EIO : OK;
|
|
} else {
|
|
if (uds_fd_table[minor].err == ECONNRESET) {
|
|
uds_fd_table[minor].err = 0;
|
|
|
|
return ECONNRESET;
|
|
} else {
|
|
return ENOTCONN;
|
|
}
|
|
}
|
|
}
|
|
|
|
PUBLIC int do_shutdown(message *dev_m_in, message *dev_m_out)
|
|
{
|
|
int minor;
|
|
int rc, how;
|
|
|
|
#if DEBUG == 1
|
|
static int call_count = 0;
|
|
printf("(uds) [%d] do_shutdown() call_count=%d\n",
|
|
uds_minor(dev_m_in), ++call_count);
|
|
#endif
|
|
|
|
minor = uds_minor(dev_m_in);
|
|
|
|
if (uds_fd_table[minor].type != SOCK_STREAM &&
|
|
uds_fd_table[minor].type != SOCK_SEQPACKET) {
|
|
|
|
/* socket must be a connection oriented socket */
|
|
return EINVAL;
|
|
}
|
|
|
|
if (uds_fd_table[minor].peer == -1) {
|
|
/* shutdown(2) is only valid for connected sockets */
|
|
if (uds_fd_table[minor].err == ECONNRESET) {
|
|
return ECONNRESET;
|
|
} else {
|
|
return ENOTCONN;
|
|
}
|
|
}
|
|
|
|
/* get the 'how' parameter from the process */
|
|
rc = sys_safecopyfrom(VFS_PROC_NR, (cp_grant_id_t) dev_m_in->IO_GRANT,
|
|
(vir_bytes) 0, (vir_bytes) &how, sizeof(int), D);
|
|
|
|
if (rc != OK) {
|
|
return EIO;
|
|
}
|
|
|
|
switch (how) {
|
|
case SHUT_RD:
|
|
/* take away read permission */
|
|
uds_fd_table[minor].mode =
|
|
uds_fd_table[minor].mode ^ S_IRUSR;
|
|
break;
|
|
|
|
case SHUT_WR:
|
|
/* take away write permission */
|
|
uds_fd_table[minor].mode =
|
|
uds_fd_table[minor].mode ^ S_IWUSR;
|
|
break;
|
|
|
|
case SHUT_RDWR:
|
|
/* completely shutdown */
|
|
uds_fd_table[minor].mode = 0;
|
|
break;
|
|
|
|
default:
|
|
/* the 'how' parameter is invalid */
|
|
return EINVAL;
|
|
}
|
|
|
|
return OK;
|
|
}
|
|
|
|
PUBLIC int do_socketpair_old(message *dev_m_in, message *dev_m_out)
|
|
{
|
|
int rc;
|
|
short minorin;
|
|
int minorx, minory;
|
|
struct sockaddr_un addr;
|
|
|
|
#if DEBUG == 1
|
|
static int call_count = 0;
|
|
printf("(uds) [%d] do_socketpair() call_count=%d\n",
|
|
uds_minor(dev_m_in), ++call_count);
|
|
#endif
|
|
|
|
/* first ioctl param is the first socket */
|
|
minorx = uds_minor_old(dev_m_in);
|
|
|
|
/* third ioctl param is the minor number of the second socket */
|
|
rc = sys_safecopyfrom(VFS_PROC_NR, (cp_grant_id_t) dev_m_in->IO_GRANT,
|
|
(vir_bytes) 0, (vir_bytes) &minorin, sizeof(short), D);
|
|
|
|
if (rc != OK) {
|
|
return EIO;
|
|
}
|
|
|
|
minory = minor(minorin);
|
|
|
|
#if DEBUG == 1
|
|
printf("socketpair() %d - %d\n", minorx, minory);
|
|
#endif
|
|
|
|
/* security check - both sockets must have the same endpoint (owner) */
|
|
if (uds_fd_table[minorx].owner != uds_fd_table[minory].owner) {
|
|
|
|
/* we won't allow you to magically connect your socket to
|
|
* someone elses socket
|
|
*/
|
|
return EPERM;
|
|
}
|
|
|
|
addr.sun_family = AF_UNIX;
|
|
addr.sun_path[0] = 'X';
|
|
addr.sun_path[1] = '\0';
|
|
|
|
uds_fd_table[minorx].syscall_done = 1;
|
|
return perform_connection(dev_m_in, dev_m_out, &addr, minorx, minory);
|
|
}
|
|
|
|
PUBLIC int do_socketpair(message *dev_m_in, message *dev_m_out)
|
|
{
|
|
int rc;
|
|
dev_t minorin;
|
|
int minorx, minory;
|
|
struct sockaddr_un addr;
|
|
|
|
#if DEBUG == 1
|
|
static int call_count = 0;
|
|
printf("(uds) [%d] do_socketpair() call_count=%d\n",
|
|
uds_minor(dev_m_in), ++call_count);
|
|
#endif
|
|
|
|
/* first ioctl param is the first socket */
|
|
minorx = uds_minor(dev_m_in);
|
|
|
|
/* third ioctl param is the minor number of the second socket */
|
|
rc = sys_safecopyfrom(VFS_PROC_NR, (cp_grant_id_t) dev_m_in->IO_GRANT,
|
|
(vir_bytes) 0, (vir_bytes) &minorin, sizeof(dev_t), D);
|
|
|
|
if (rc != OK) {
|
|
return EIO;
|
|
}
|
|
|
|
minory = minor(minorin);
|
|
|
|
#if DEBUG == 1
|
|
printf("socketpair() %d - %d\n", minorx, minory);
|
|
#endif
|
|
|
|
/* security check - both sockets must have the same endpoint (owner) */
|
|
if (uds_fd_table[minorx].owner != uds_fd_table[minory].owner) {
|
|
|
|
/* we won't allow you to magically connect your socket to
|
|
* someone elses socket
|
|
*/
|
|
return EPERM;
|
|
}
|
|
|
|
addr.sun_family = AF_UNIX;
|
|
addr.sun_path[0] = 'X';
|
|
addr.sun_path[1] = '\0';
|
|
|
|
uds_fd_table[minorx].syscall_done = 1;
|
|
return perform_connection(dev_m_in, dev_m_out, &addr, minorx, minory);
|
|
}
|
|
|
|
PUBLIC int do_getsockopt_sotype(message *dev_m_in, message *dev_m_out)
|
|
{
|
|
int minor;
|
|
int rc;
|
|
|
|
#if DEBUG == 1
|
|
static int call_count = 0;
|
|
printf("(uds) [%d] do_getsockopt_sotype() call_count=%d\n",
|
|
uds_minor(dev_m_in), ++call_count);
|
|
#endif
|
|
|
|
minor = uds_minor(dev_m_in);
|
|
|
|
if (uds_fd_table[minor].type == -1) {
|
|
|
|
/* the type hasn't been set yet. instead of returning an
|
|
* invalid type, we fail with EINVAL
|
|
*/
|
|
return EINVAL;
|
|
}
|
|
|
|
rc = sys_safecopyto(VFS_PROC_NR, (cp_grant_id_t) dev_m_in->IO_GRANT,
|
|
(vir_bytes) 0, (vir_bytes) &(uds_fd_table[minor].type),
|
|
sizeof(int), D);
|
|
|
|
return rc ? EIO : OK;
|
|
}
|
|
|
|
PUBLIC int do_getsockopt_peercred(message *dev_m_in, message *dev_m_out)
|
|
{
|
|
int minor;
|
|
int peer_minor;
|
|
int rc;
|
|
struct ucred cred;
|
|
|
|
#if DEBUG == 1
|
|
static int call_count = 0;
|
|
printf("(uds) [%d] do_getsockopt_peercred() call_count=%d\n",
|
|
uds_minor(dev_m_in), ++call_count);
|
|
#endif
|
|
|
|
minor = uds_minor(dev_m_in);
|
|
|
|
if (uds_fd_table[minor].peer == -1) {
|
|
|
|
if (uds_fd_table[minor].err == ECONNRESET) {
|
|
uds_fd_table[minor].err = 0;
|
|
|
|
return ECONNRESET;
|
|
} else {
|
|
return ENOTCONN;
|
|
}
|
|
}
|
|
|
|
peer_minor = uds_fd_table[minor].peer;
|
|
|
|
/* obtain the peer's credentials */
|
|
rc = getnucred(uds_fd_table[peer_minor].owner, &cred);
|
|
if (rc == -1) {
|
|
/* likely error: invalid endpoint / proc doesn't exist */
|
|
return errno;
|
|
}
|
|
|
|
rc = sys_safecopyto(VFS_PROC_NR, (cp_grant_id_t) dev_m_in->IO_GRANT,
|
|
(vir_bytes) 0, (vir_bytes) &cred, sizeof(struct ucred), D);
|
|
|
|
return rc ? EIO : OK;
|
|
}
|
|
|
|
PUBLIC int do_getsockopt_peercred_old(message *dev_m_in, message *dev_m_out)
|
|
{
|
|
int minor;
|
|
int peer_minor;
|
|
int rc;
|
|
struct ucred cred;
|
|
struct ucred_old cred_old;
|
|
|
|
#if DEBUG == 1
|
|
static int call_count = 0;
|
|
printf("(uds) [%d] do_getsockopt_peercred() call_count=%d\n",
|
|
uds_minor(dev_m_in), ++call_count);
|
|
#endif
|
|
|
|
minor = uds_minor(dev_m_in);
|
|
|
|
if (uds_fd_table[minor].peer == -1) {
|
|
|
|
if (uds_fd_table[minor].err == ECONNRESET) {
|
|
uds_fd_table[minor].err = 0;
|
|
|
|
return ECONNRESET;
|
|
} else {
|
|
return ENOTCONN;
|
|
}
|
|
}
|
|
|
|
peer_minor = uds_fd_table[minor].peer;
|
|
|
|
/* obtain the peer's credentials */
|
|
rc = getnucred(uds_fd_table[peer_minor].owner, &cred);
|
|
if (rc == -1) {
|
|
/* likely error: invalid endpoint / proc doesn't exist */
|
|
return errno;
|
|
}
|
|
|
|
/* copy to old structure */
|
|
cred_old.pid = cred.pid;
|
|
cred_old.uid = (short) cred.uid;
|
|
cred_old.gid = (char) cred.gid;
|
|
|
|
rc = sys_safecopyto(VFS_PROC_NR, (cp_grant_id_t) dev_m_in->IO_GRANT,
|
|
(vir_bytes) 0, (vir_bytes) &cred_old, sizeof(struct ucred_old),
|
|
D);
|
|
|
|
return rc ? EIO : OK;
|
|
}
|
|
|
|
int do_getsockopt_sndbuf(message *dev_m_in, message *dev_m_out)
|
|
{
|
|
int minor;
|
|
int rc;
|
|
size_t sndbuf = PIPE_BUF;
|
|
|
|
#if DEBUG == 1
|
|
static int call_count = 0;
|
|
printf("(uds) [%d] do_getsockopt_sndbuf() call_count=%d\n",
|
|
uds_minor(dev_m_in), ++call_count);
|
|
#endif
|
|
|
|
minor = uds_minor(dev_m_in);
|
|
|
|
rc = sys_safecopyto(VFS_PROC_NR, (cp_grant_id_t) dev_m_in->IO_GRANT,
|
|
(vir_bytes) 0, (vir_bytes) &(sndbuf),
|
|
sizeof(size_t), D);
|
|
|
|
return rc ? EIO : OK;
|
|
}
|
|
|
|
int do_setsockopt_sndbuf(message *dev_m_in, message *dev_m_out)
|
|
{
|
|
int minor;
|
|
int rc;
|
|
size_t sndbuf;
|
|
|
|
#if DEBUG == 1
|
|
static int call_count = 0;
|
|
printf("(uds) [%d] do_setsockopt_rcvbuf() call_count=%d\n",
|
|
uds_minor(dev_m_in), ++call_count);
|
|
#endif
|
|
|
|
minor = uds_minor(dev_m_in);
|
|
|
|
|
|
rc = sys_safecopyfrom(VFS_PROC_NR, (cp_grant_id_t) dev_m_in->IO_GRANT,
|
|
(vir_bytes) 0, (vir_bytes) &sndbuf,
|
|
sizeof(size_t), D);
|
|
|
|
if (rc != OK) {
|
|
return EIO;
|
|
}
|
|
|
|
if (sndbuf > PIPE_BUF) {
|
|
/* The send buffer is limited to 32K at the moment. */
|
|
return ENOSYS;
|
|
}
|
|
|
|
/* There is no way to reduce the send buffer, do we have to
|
|
* let this call fail for smaller buffers?
|
|
*/
|
|
return OK;
|
|
}
|
|
|
|
int do_getsockopt_rcvbuf(message *dev_m_in, message *dev_m_out)
|
|
{
|
|
int minor;
|
|
int rc;
|
|
size_t rcvbuf = PIPE_BUF;
|
|
|
|
#if DEBUG == 1
|
|
static int call_count = 0;
|
|
printf("(uds) [%d] do_getsockopt_rcvbuf() call_count=%d\n",
|
|
uds_minor(dev_m_in), ++call_count);
|
|
#endif
|
|
|
|
minor = uds_minor(dev_m_in);
|
|
|
|
rc = sys_safecopyto(VFS_PROC_NR, (cp_grant_id_t) dev_m_in->IO_GRANT,
|
|
(vir_bytes) 0, (vir_bytes) &(rcvbuf),
|
|
sizeof(size_t), D);
|
|
|
|
return rc ? EIO : OK;
|
|
}
|
|
|
|
int do_setsockopt_rcvbuf(message *dev_m_in, message *dev_m_out)
|
|
{
|
|
int minor;
|
|
int rc;
|
|
size_t rcvbuf;
|
|
|
|
#if DEBUG == 1
|
|
static int call_count = 0;
|
|
printf("(uds) [%d] do_setsockopt_rcvbuf() call_count=%d\n",
|
|
uds_minor(dev_m_in), ++call_count);
|
|
#endif
|
|
|
|
minor = uds_minor(dev_m_in);
|
|
|
|
|
|
rc = sys_safecopyfrom(VFS_PROC_NR, (cp_grant_id_t) dev_m_in->IO_GRANT,
|
|
(vir_bytes) 0, (vir_bytes) &rcvbuf,
|
|
sizeof(size_t), D);
|
|
|
|
if (rc != OK) {
|
|
return EIO;
|
|
}
|
|
|
|
if (rcvbuf > PIPE_BUF) {
|
|
/* The send buffer is limited to 32K at the moment. */
|
|
return ENOSYS;
|
|
}
|
|
|
|
/* There is no way to reduce the send buffer, do we have to
|
|
* let this call fail for smaller buffers?
|
|
*/
|
|
return OK;
|
|
}
|
|
|
|
|
|
PUBLIC int do_sendto(message *dev_m_in, message *dev_m_out)
|
|
{
|
|
int minor;
|
|
int rc;
|
|
struct sockaddr_un addr;
|
|
|
|
#if DEBUG == 1
|
|
static int call_count = 0;
|
|
printf("(uds) [%d] do_sendto() call_count=%d\n", uds_minor(dev_m_in),
|
|
++call_count);
|
|
#endif
|
|
|
|
minor = uds_minor(dev_m_in);
|
|
|
|
if (uds_fd_table[minor].type != SOCK_DGRAM) {
|
|
/* This IOCTL is only for SOCK_DGRAM sockets */
|
|
return EINVAL;
|
|
}
|
|
|
|
rc = sys_safecopyfrom(VFS_PROC_NR, (cp_grant_id_t) dev_m_in->IO_GRANT,
|
|
(vir_bytes) 0, (vir_bytes) &addr, sizeof(struct sockaddr_un),
|
|
D);
|
|
|
|
if (rc != OK) {
|
|
return EIO;
|
|
}
|
|
|
|
/* do some basic sanity checks on the address */
|
|
if (addr.sun_family != AF_UNIX || addr.sun_path[0] == '\0') {
|
|
/* bad address */
|
|
return EINVAL;
|
|
}
|
|
|
|
rc = check_perms(minor, &addr);
|
|
if (rc != OK) {
|
|
return rc;
|
|
}
|
|
|
|
memcpy(&(uds_fd_table[minor].target), &addr,
|
|
sizeof(struct sockaddr_un));
|
|
|
|
return OK;
|
|
}
|
|
|
|
PUBLIC int do_recvfrom(message *dev_m_in, message *dev_m_out)
|
|
{
|
|
int minor;
|
|
int rc;
|
|
|
|
#if DEBUG == 1
|
|
static int call_count = 0;
|
|
printf("(uds) [%d] do_recvfrom() call_count=%d\n",
|
|
uds_minor(dev_m_in), ++call_count);
|
|
#endif
|
|
|
|
minor = uds_minor(dev_m_in);
|
|
|
|
rc = sys_safecopyto(VFS_PROC_NR, (cp_grant_id_t) dev_m_in->IO_GRANT,
|
|
(vir_bytes) 0, (vir_bytes) &(uds_fd_table[minor].source),
|
|
sizeof(struct sockaddr_un), D);
|
|
|
|
return rc ? EIO : OK;
|
|
}
|
|
|
|
int msg_control_read(struct msg_control *msg_ctrl, struct ancillary *data,
|
|
int minor)
|
|
{
|
|
int rc;
|
|
struct msghdr msghdr;
|
|
struct cmsghdr *cmsg = NULL;
|
|
|
|
#if DEBUG == 1
|
|
static int call_count = 0;
|
|
printf("(uds) [%d] msg_control_read() call_count=%d\n", minor,
|
|
++call_count);
|
|
#endif
|
|
|
|
data->nfiledes = 0;
|
|
|
|
memset(&msghdr, '\0', sizeof(struct msghdr));
|
|
msghdr.msg_control = msg_ctrl->msg_control;
|
|
msghdr.msg_controllen = msg_ctrl->msg_controllen;
|
|
|
|
for(cmsg = CMSG_FIRSTHDR(&msghdr); cmsg != NULL;
|
|
cmsg = CMSG_NXTHDR(&msghdr, cmsg)) {
|
|
|
|
if (cmsg->cmsg_level == SOL_SOCKET &&
|
|
cmsg->cmsg_type == SCM_RIGHTS) {
|
|
|
|
int i;
|
|
int nfds =
|
|
MIN((cmsg->cmsg_len-CMSG_LEN(0))/sizeof(int),
|
|
OPEN_MAX);
|
|
|
|
for (i = 0; i < nfds; i++) {
|
|
if (data->nfiledes == OPEN_MAX) {
|
|
return EOVERFLOW;
|
|
}
|
|
|
|
data->fds[data->nfiledes] =
|
|
((int *) CMSG_DATA(cmsg))[i];
|
|
#if DEBUG == 1
|
|
printf("(uds) [%d] fd[%d]=%d\n", minor,
|
|
data->nfiledes, data->fds[data->nfiledes]);
|
|
#endif
|
|
data->nfiledes++;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* obtain this socket's credentials */
|
|
rc = getnucred(uds_fd_table[minor].owner, &(data->cred));
|
|
if (rc == -1) {
|
|
return errno;
|
|
}
|
|
#if DEBUG == 1
|
|
printf("(uds) [%d] cred={%d,%d,%d}\n", minor,
|
|
data->cred.pid, data->cred.uid,
|
|
data->cred.gid);
|
|
#endif
|
|
return OK;
|
|
}
|
|
|
|
PRIVATE int send_fds(int minor, struct ancillary *data)
|
|
{
|
|
int rc, i, j;
|
|
|
|
#if DEBUG == 1
|
|
static int call_count = 0;
|
|
printf("(uds) [%d] send_fds() call_count=%d\n", minor, ++call_count);
|
|
#endif
|
|
|
|
/* verify the file descriptors and get their filps. */
|
|
for (i = 0; i < data->nfiledes; i++) {
|
|
data->filps[i] = verify_fd(uds_fd_table[minor].owner,
|
|
data->fds[i]);
|
|
|
|
if (data->filps[i] == NULL) {
|
|
return EINVAL;
|
|
}
|
|
}
|
|
|
|
/* set them as in-flight */
|
|
for (i = 0; i < data->nfiledes; i++) {
|
|
rc = set_filp(data->filps[i]);
|
|
if (rc != OK) {
|
|
/* revert set_filp() calls */
|
|
for (j = i; j >= 0; j--) {
|
|
put_filp(data->filps[j]);
|
|
}
|
|
return rc;
|
|
}
|
|
}
|
|
|
|
return OK;
|
|
}
|
|
|
|
PUBLIC int clear_fds(int minor, struct ancillary *data)
|
|
{
|
|
/* This function calls put_filp() for all of the FDs in data.
|
|
* This is used when a Unix Domain Socket is closed and there
|
|
* exists references to file descriptors that haven't been received
|
|
* with recvmsg().
|
|
*/
|
|
int i;
|
|
|
|
#if DEBUG == 1
|
|
static int call_count = 0;
|
|
printf("(uds) [%d] recv_fds() call_count=%d\n", minor,
|
|
++call_count);
|
|
#endif
|
|
|
|
for (i = 0; i < data->nfiledes; i++) {
|
|
put_filp(data->filps[i]);
|
|
#if DEBUG == 1
|
|
printf("(uds) clear_fds() => %d\n", data->fds[i]);
|
|
#endif
|
|
data->fds[i] = -1;
|
|
data->filps[i] = NULL;
|
|
}
|
|
|
|
data->nfiledes = 0;
|
|
|
|
return OK;
|
|
}
|
|
|
|
PRIVATE int recv_fds(int minor, struct ancillary *data,
|
|
struct msg_control *msg_ctrl)
|
|
{
|
|
int rc, i, j;
|
|
struct msghdr msghdr;
|
|
struct cmsghdr *cmsg;
|
|
endpoint_t to_ep;
|
|
|
|
#if DEBUG == 1
|
|
static int call_count = 0;
|
|
printf("(uds) [%d] recv_fds() call_count=%d\n", minor,
|
|
++call_count);
|
|
#endif
|
|
|
|
msghdr.msg_control = msg_ctrl->msg_control;
|
|
msghdr.msg_controllen = msg_ctrl->msg_controllen;
|
|
|
|
cmsg = CMSG_FIRSTHDR(&msghdr);
|
|
cmsg->cmsg_len = CMSG_LEN(sizeof(int) * data->nfiledes);
|
|
cmsg->cmsg_level = SOL_SOCKET;
|
|
cmsg->cmsg_type = SCM_RIGHTS;
|
|
|
|
to_ep = uds_fd_table[minor].owner;
|
|
|
|
/* copy to the target endpoint */
|
|
for (i = 0; i < data->nfiledes; i++) {
|
|
rc = copy_filp(to_ep, data->filps[i]);
|
|
if (rc < 0) {
|
|
/* revert set_filp() calls */
|
|
for (j = 0; j < data->nfiledes; j++) {
|
|
put_filp(data->filps[j]);
|
|
}
|
|
/* revert copy_filp() calls */
|
|
for (j = i; j >= 0; j--) {
|
|
cancel_fd(to_ep, data->fds[j]);
|
|
}
|
|
return rc;
|
|
}
|
|
data->fds[i] = rc; /* data->fds[i] now has the new FD */
|
|
}
|
|
|
|
for (i = 0; i < data->nfiledes; i++) {
|
|
put_filp(data->filps[i]);
|
|
#if DEBUG == 1
|
|
printf("(uds) recv_fds() => %d\n", data->fds[i]);
|
|
#endif
|
|
((int *)CMSG_DATA(cmsg))[i] = data->fds[i];
|
|
data->fds[i] = -1;
|
|
data->filps[i] = NULL;
|
|
}
|
|
|
|
data->nfiledes = 0;
|
|
|
|
return OK;
|
|
}
|
|
|
|
PRIVATE int recv_cred(int minor, struct ancillary *data,
|
|
struct msg_control *msg_ctrl)
|
|
{
|
|
struct msghdr msghdr;
|
|
struct cmsghdr *cmsg;
|
|
|
|
#if DEBUG == 1
|
|
static int call_count = 0;
|
|
printf("(uds) [%d] recv_cred() call_count=%d\n", minor,
|
|
++call_count);
|
|
#endif
|
|
|
|
msghdr.msg_control = msg_ctrl->msg_control;
|
|
msghdr.msg_controllen = msg_ctrl->msg_controllen;
|
|
|
|
cmsg = CMSG_FIRSTHDR(&msghdr);
|
|
if (cmsg->cmsg_len > 0) {
|
|
cmsg = CMSG_NXTHDR(&msghdr, cmsg);
|
|
}
|
|
|
|
cmsg->cmsg_len = CMSG_LEN(sizeof(struct ucred));
|
|
cmsg->cmsg_level = SOL_SOCKET;
|
|
cmsg->cmsg_type = SCM_CREDENTIALS;
|
|
memcpy(CMSG_DATA(cmsg), &(data->cred), sizeof(struct ucred));
|
|
|
|
return OK;
|
|
}
|
|
|
|
PUBLIC int do_sendmsg(message *dev_m_in, message *dev_m_out)
|
|
{
|
|
int minor, peer, rc, i;
|
|
struct msg_control msg_ctrl;
|
|
|
|
#if DEBUG == 1
|
|
static int call_count = 0;
|
|
printf("(uds) [%d] do_sendmsg() call_count=%d\n",
|
|
uds_minor(dev_m_in), ++call_count);
|
|
#endif
|
|
|
|
minor = uds_minor(dev_m_in);
|
|
|
|
memset(&msg_ctrl, '\0', sizeof(struct msg_control));
|
|
|
|
rc = sys_safecopyfrom(VFS_PROC_NR, (cp_grant_id_t) dev_m_in->IO_GRANT,
|
|
(vir_bytes) 0, (vir_bytes) &msg_ctrl,
|
|
sizeof(struct msg_control), D);
|
|
|
|
if (rc != OK) {
|
|
return EIO;
|
|
}
|
|
|
|
/* locate peer */
|
|
peer = -1;
|
|
if (uds_fd_table[minor].type == SOCK_DGRAM) {
|
|
if (uds_fd_table[minor].target.sun_path[0] == '\0' ||
|
|
uds_fd_table[minor].target.sun_family != AF_UNIX) {
|
|
|
|
return EDESTADDRREQ;
|
|
}
|
|
|
|
for (i = 0; i < NR_FDS; i++) {
|
|
|
|
/* look for a SOCK_DGRAM socket that is bound on
|
|
* the target address
|
|
*/
|
|
if (uds_fd_table[i].type == SOCK_DGRAM &&
|
|
uds_fd_table[i].addr.sun_family == AF_UNIX &&
|
|
!strncmp(uds_fd_table[minor].target.sun_path,
|
|
uds_fd_table[i].addr.sun_path, UNIX_PATH_MAX)){
|
|
|
|
peer = i;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (peer == -1) {
|
|
return ENOENT;
|
|
}
|
|
} else {
|
|
peer = uds_fd_table[minor].peer;
|
|
if (peer == -1) {
|
|
return ENOTCONN;
|
|
}
|
|
}
|
|
|
|
#if DEBUG == 1
|
|
printf("(uds) [%d] sendmsg() -- peer=%d\n", minor, peer);
|
|
#endif
|
|
/* note: it's possible that there is already some file
|
|
* descriptors in ancillary_data if the peer didn't call
|
|
* recvmsg() yet. That's okay. The receiver will
|
|
* get the current file descriptors plus the new ones.
|
|
*/
|
|
rc = msg_control_read(&msg_ctrl, &uds_fd_table[peer].ancillary_data,
|
|
minor);
|
|
if (rc != OK) {
|
|
return rc;
|
|
}
|
|
|
|
return send_fds(minor, &uds_fd_table[peer].ancillary_data);
|
|
}
|
|
|
|
PUBLIC int do_recvmsg(message *dev_m_in, message *dev_m_out)
|
|
{
|
|
int minor;
|
|
int rc;
|
|
struct msg_control msg_ctrl;
|
|
socklen_t controllen_avail = 0;
|
|
socklen_t controllen_needed = 0;
|
|
socklen_t controllen_desired = 0;
|
|
|
|
#if DEBUG == 1
|
|
static int call_count = 0;
|
|
printf("(uds) [%d] do_sendmsg() call_count=%d\n",
|
|
uds_minor(dev_m_in), ++call_count);
|
|
#endif
|
|
|
|
minor = uds_minor(dev_m_in);
|
|
|
|
|
|
#if DEBUG == 1
|
|
printf("(uds) [%d] CREDENTIALS {pid:%d,uid:%d,gid:%d}\n", minor,
|
|
uds_fd_table[minor].ancillary_data.cred.pid,
|
|
uds_fd_table[minor].ancillary_data.cred.uid,
|
|
uds_fd_table[minor].ancillary_data.cred.gid);
|
|
#endif
|
|
|
|
memset(&msg_ctrl, '\0', sizeof(struct msg_control));
|
|
|
|
/* get the msg_control from the user, it will include the
|
|
* amount of space the user has allocated for control data.
|
|
*/
|
|
rc = sys_safecopyfrom(VFS_PROC_NR, (cp_grant_id_t) dev_m_in->IO_GRANT,
|
|
(vir_bytes) 0, (vir_bytes) &msg_ctrl,
|
|
sizeof(struct msg_control), D);
|
|
|
|
if (rc != OK) {
|
|
return EIO;
|
|
}
|
|
|
|
controllen_avail = MIN(msg_ctrl.msg_controllen, MSG_CONTROL_MAX);
|
|
|
|
if (uds_fd_table[minor].ancillary_data.nfiledes > 0) {
|
|
controllen_needed = CMSG_LEN(sizeof(int) *
|
|
(uds_fd_table[minor].ancillary_data.nfiledes));
|
|
}
|
|
|
|
/* if there is room we also include credentials */
|
|
controllen_desired = controllen_needed +
|
|
CMSG_LEN(sizeof(struct ucred));
|
|
|
|
if (controllen_needed > controllen_avail) {
|
|
return EOVERFLOW;
|
|
}
|
|
|
|
rc = recv_fds(minor, &uds_fd_table[minor].ancillary_data, &msg_ctrl);
|
|
if (rc != OK) {
|
|
return rc;
|
|
}
|
|
|
|
if (controllen_desired <= controllen_avail) {
|
|
rc = recv_cred(minor, &uds_fd_table[minor].ancillary_data,
|
|
&msg_ctrl);
|
|
if (rc != OK) {
|
|
return rc;
|
|
}
|
|
}
|
|
|
|
/* send the user the control data */
|
|
rc = sys_safecopyto(VFS_PROC_NR, (cp_grant_id_t) dev_m_in->IO_GRANT,
|
|
(vir_bytes) 0, (vir_bytes) &msg_ctrl,
|
|
sizeof(struct msg_control), D);
|
|
|
|
return rc ? EIO : OK;
|
|
}
|