libcontract/common/libcontract_priv.c

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright (c) 2004, 2011, Oracle and/or its affiliates. All rights reserved.
 */

#include <sys/ctfs.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <limits.h>
#include <stdio.h>
#include <assert.h>
#include <libuutil.h>
#include <libintl.h>
#include <string.h>
#include <procfs.h>
#include <libcontract.h>
#include <libcontract_priv.h>
#include "libcontract_impl.h"
#include "process_dump.h"
#include "device_dump.h"


contract_type_t types[CTT_MAXTYPE] = {
    { "process", event_process },
    { "device", event_device }
};

static int
close_on_exec(int fd)
{
    int flags = fcntl(fd, F_GETFD, 0);
    if ((flags != -1) && (fcntl(fd, F_SETFD, flags | FD_CLOEXEC) != -1))
        return (0);
    return (-1);
}

int
contract_latest(ctid_t *id)
{
    int cfd, r;
    ct_stathdl_t st;
    ctid_t result;

    if ((cfd = open64(CTFS_ROOT "/process/latest", O_RDONLY)) == -1)
        return (errno);

    if ((r = ct_status_read(cfd, CTD_COMMON, &st)) != 0) {
        (void) close(cfd);
        return (r);
    }

    result = ct_status_get_id(st);
    ct_status_free(st);
    (void) close(cfd);

    *id = result;
    return (0);
}

int
contract_open(ctid_t ctid, const char *type, const char *file, int oflag)
{
    char path[PATH_MAX];
    int n, fd;

    assert((oflag & O_CREAT) == 0);

    if (type == NULL)
        type = "all";

    n = snprintf(path, PATH_MAX, CTFS_ROOT "/%s/%ld/%s", type, ctid, file);
    if (n >= PATH_MAX) {
        errno = ENAMETOOLONG;
        return (-1);
    }

    fd = open64(path, oflag);
    if (fd != -1) {
        if (close_on_exec(fd) == -1) {
            int err = errno;
            (void) close(fd);
            errno = err;
            return (-1);
        }
    }
    return (fd);
}

int
contract_abandon_id(ctid_t ctid)
{
    int fd, err;

    fd = contract_open(ctid, "all", "ctl", O_WRONLY);
    if (fd == -1)
        return (errno);

    err = ct_ctl_abandon(fd);
    (void) close(fd);

    return (err);
}

ctid_t
getctid(void)
{
    int fd;
    psinfo_t ps;

    if ((fd = open("/proc/self/psinfo", O_RDONLY)) == -1)
        return (-1);
    if (read(fd, &ps, sizeof (ps)) != sizeof (ps)) {
        (void) close(fd);
        return (-1);
    }
    (void) close(fd);
    return (ps.pr_contract);
}

void
contract_event_dump(FILE *file, ct_evthdl_t hdl, int verbose)
{
    ct_typeid_t type;
    struct ctlib_event_info *info = hdl;

    type = info->event.ctev_cttype;
    types[type].type_event(file, hdl, verbose);
}

void
contract_negend_dump(FILE *file, ct_evthdl_t ev)
{
    ctevid_t nevid = 0;
    ctid_t my_ctid = ct_event_get_ctid(ev);
    ctid_t new_ctid = 0;
    char *s;

    (void) ct_event_get_nevid(ev, &nevid);
    (void) ct_event_get_newct(ev, &new_ctid);

    if (new_ctid != my_ctid) {
        s = dgettext(TEXT_DOMAIN, "negotiation %llu succeeded\n");
    } else {
        s = dgettext(TEXT_DOMAIN, "negotiation %llu failed\n");
    }
    /*LINTED*/
    (void) fprintf(file, s, (unsigned long long)nevid);
}

/*
 * return 0 if all supplied decorations match
 *        1 if at least only one supplied decoration diverges
 *        on error, errno is set and -1 is returned
 */
int
contract_pr_check_decorations(const char *svc_fmri, ctid_t ctid,
    const char *svc_creator, const char *svc_aux)
{
    ctid_t  my_ctid, ct_ctid;
    ct_stathdl_t status;
    char *ct_svc_fmri;
    char *ct_creator;
    char *ct_svc_aux;
    int fd;
    int e;
    int r = 0;

    if ((my_ctid = getctid()) == -1) {
        return (-1);
    }

    if ((fd = contract_open(my_ctid, "process", "status",
        O_RDONLY)) == -1) {
        return (-1);
    }

    if ((e = ct_status_read(fd, CTD_ALL, &status)) != 0) {
        (void) close(fd);
        errno = e;
        return (-1);
    }
    (void) close(fd);

    if (svc_fmri != NULL) {
        if ((e = ct_pr_status_get_svc_fmri(status,
            &ct_svc_fmri)) != 0) {
            r = -1;
            goto out;
        }
        if (strcmp(ct_svc_fmri, svc_fmri) != 0) {
            r = 1;
            goto out;
        }
    }

    if (ctid != -1) {
        if ((e = ct_pr_status_get_svc_ctid(status, &ct_ctid)) != 0) {
            r = -1;
            goto out;
        }
        if (ct_ctid != ctid) {
            r = 1;
            goto out;
        }
    }

    if (svc_creator != NULL) {
        if ((e = ct_pr_status_get_svc_creator(status,
            &ct_creator)) != 0) {
            r = -1;
            goto out;
        }
        if (strcmp(ct_creator, svc_creator) != 0) {
            r = 1;
            goto out;
        }
    }

    if (svc_aux != NULL) {
        if ((e = ct_pr_status_get_svc_aux(status, &ct_svc_aux)) != 0) {
            r = -1;
            goto out;
        }
        if (strcmp(ct_svc_aux, svc_aux) != 0) {
            r = 1;
            goto out;
        }
    }

out:
    ct_status_free(status);
    if (r == -1)
        errno = e;

    return (r);
}