/*
* Copyright (c) 2010 The FreeBSD Foundation
* All rights reserved.
*
* This software was developed by Rui Paulo under sponsorship from the
* FreeBSD Foundation.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#ifdef __FBSDID
__FBSDID("$FreeBSD: head/lib/librtld_db/rtld_db.c 272488 2014-10-03 23:20:37Z markj $");
#else
__RCSID("$NetBSD: rtld_db.c,v 1.3 2016/04/26 14:26:49 chs Exp $");
#endif

#include <sys/types.h>
#include <sys/sysctl.h>

#include <inttypes.h>
#include <err.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>
#include <libproc.h>
#include <util.h>

#include "rtld_db.h"

static int _librtld_db_debug = 0;
#define DPRINTF(...) do {                               \
       if (_librtld_db_debug) {                        \
               fprintf(stderr, "librtld_db: DEBUG: "); \
               fprintf(stderr, __VA_ARGS__);           \
       }                                               \
} while (0)

void
rd_delete(rd_agent_t *rdap)
{

       free(rdap);
}

const char *
rd_errstr(rd_err_e rderr)
{

       switch (rderr) {
       case RD_ERR:
               return "generic error";
       case RD_OK:
               return "no error";
       case RD_NOCAPAB:
               return "capability not supported";
       case RD_DBERR:
               return "database error";
       case RD_NOBASE:
               return "NOBASE";
       case RD_NOMAPS:
               return "NOMAPS";
       default:
               return "unknown error";
       }
}

rd_err_e
rd_event_addr(rd_agent_t *rdap, rd_event_e event, rd_notify_t *notify)
{
       rd_err_e ret;

       DPRINTF("%s rdap %p event %d notify %p\n", __func__, rdap, event,
           notify);

       ret = RD_OK;
       switch (event) {
       case RD_NONE:
               break;
       case RD_PREINIT:
               notify->type = RD_NOTIFY_BPT;
               notify->u.bptaddr = rdap->rda_preinit_addr;
               break;
       case RD_POSTINIT:
               notify->type = RD_NOTIFY_BPT;
               notify->u.bptaddr = rdap->rda_postinit_addr;
               break;
       case RD_DLACTIVITY:
               notify->type = RD_NOTIFY_BPT;
               notify->u.bptaddr = rdap->rda_dlactivity_addr;
               break;
       default:
               ret = RD_ERR;
               break;
       }
       return (ret);
}

rd_err_e
rd_event_enable(rd_agent_t *rdap __unused, int onoff)
{
       DPRINTF("%s onoff %d\n", __func__, onoff);

       return (RD_OK);
}

rd_err_e
rd_event_getmsg(rd_agent_t *rdap __unused, rd_event_msg_t *msg)
{
       DPRINTF("%s\n", __func__);

       msg->type = RD_POSTINIT;
       msg->u.state = RD_CONSISTENT;

       return (RD_OK);
}

rd_err_e
rd_init(int version)
{
       char *debug = NULL;

       if (version == RD_VERSION) {
               debug = getenv("LIBRTLD_DB_DEBUG");
               _librtld_db_debug = debug ? atoi(debug) : 0;
               return (RD_OK);
       } else
               return (RD_NOCAPAB);
}

rd_err_e
rd_loadobj_iter(rd_agent_t *rdap, rl_iter_f *cb, void *clnt_data)
{
       size_t cnt, i, lastvn = 0;
       rd_loadobj_t rdl;
       struct kinfo_vmentry *kves, *kve;

       DPRINTF("%s\n", __func__);

       if ((kves = kinfo_getvmmap(proc_getpid(rdap->rda_php), &cnt)) == NULL) {
               warn("ERROR: kinfo_getvmmap() failed");
               return (RD_ERR);
       }
       for (i = 0; i < cnt; i++) {
               kve = kves + i;
               if (kve->kve_type == KVME_TYPE_VNODE)
                       lastvn = i;
               memset(&rdl, 0, sizeof(rdl));
               /*
                * Map the kinfo_vmentry struct to the rd_loadobj structure.
                */
               rdl.rdl_saddr = kve->kve_start;
               rdl.rdl_eaddr = kve->kve_end;
               rdl.rdl_offset = kve->kve_offset;
               if (kve->kve_protection & KVME_PROT_READ)
                       rdl.rdl_prot |= RD_RDL_R;
               if (kve->kve_protection & KVME_PROT_WRITE)
                       rdl.rdl_prot |= RD_RDL_W;
               if (kve->kve_protection & KVME_PROT_EXEC)
                       rdl.rdl_prot |= RD_RDL_X;
               strlcpy(rdl.rdl_path, kves[lastvn].kve_path,
                       sizeof(rdl.rdl_path));
               (*cb)(&rdl, clnt_data);
       }
       free(kves);

       return (RD_OK);
}

void
rd_log(const int onoff)
{
       DPRINTF("%s\n", __func__);

       (void)onoff;
}

rd_agent_t *
rd_new(struct proc_handle *php)
{
       rd_agent_t *rdap;

       rdap = malloc(sizeof(rd_agent_t));
       if (rdap) {
               memset(rdap, 0, sizeof(rd_agent_t));
               rdap->rda_php = php;
               rd_reset(rdap);
       }

       return (rdap);
}

rd_err_e
rd_objpad_enable(rd_agent_t *rdap, size_t padsize)
{
       DPRINTF("%s\n", __func__);

       (void)rdap;
       (void)padsize;

       return (RD_ERR);
}

rd_err_e
rd_plt_resolution(rd_agent_t *rdap, uintptr_t pc, struct proc *proc,
   uintptr_t plt_base, rd_plt_info_t *rpi)
{
       DPRINTF("%s\n", __func__);

       (void)rdap;
       (void)pc;
       (void)proc;
       (void)plt_base;
       (void)rpi;

       return (RD_ERR);
}

rd_err_e
rd_reset(rd_agent_t *rdap)
{
       GElf_Sym sym;

       /*
        * preinit and dlactivity events are not supported yet.
        */

       rdap->rda_preinit_addr = (uintptr_t)-1;
       rdap->rda_dlactivity_addr = (uintptr_t)-1;

       if (proc_name2sym(rdap->rda_php, "ld.elf_so", "_rtld_debug_state",
           &sym, NULL) < 0)
               return (RD_ERR);
       DPRINTF("found _rtld_debug_state at 0x%lx\n",
           (unsigned long)sym.st_value);
       rdap->rda_postinit_addr = sym.st_value;

       return (RD_OK);
}

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