/*-
* Copyright (c) 2008 John Birrell ([email protected])
* All rights reserved.
*
* 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.
*
* $FreeBSD: head/lib/libproc/proc_create.c 265255 2014-05-03 04:44:03Z markj $
*/
#include <sys/cdefs.h>
__RCSID("$NetBSD: proc_create.c,v 1.3 2017/06/09 01:17:25 chs Exp $");

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

#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "_libproc.h"

static int      proc_init(pid_t, int, int, struct proc_handle *);

static int
proc_init(pid_t pid, int flags, int status, struct proc_handle *phdl)
{
       struct kinfo_proc2 kp;
       int mib[6], error;
       size_t len;

       memset(phdl, 0, sizeof(*phdl));
       phdl->pid = pid;
       phdl->flags = flags;
       phdl->status = status;

       mib[0] = CTL_KERN;
       mib[1] = KERN_PROC_ARGS;
       mib[2] = pid;
       mib[3] = KERN_PROC_PATHNAME;
       len = sizeof(phdl->execname);
       if (sysctl(mib, 4, phdl->execname, &len, NULL, 0) != 0) {
               error = errno;
               DPRINTF("ERROR: cannot get pathname for child process %d", pid);
               return (error);
       }
       if (len == 0)
               phdl->execname[0] = '\0';

#ifdef _LP64
       len = sizeof(kp);
       mib[0] = CTL_KERN;
       mib[1] = KERN_PROC2;
       mib[2] = KERN_PROC_PID;
       mib[3] = pid;
       mib[4] = len;
       mib[5] = 1;
       if (sysctl(mib, 6, &kp, &len, NULL, 0) != 0) {
               error = errno;
               DPRINTF("ERROR: cannot get kinfo_proc2 for pid %d", pid);
               return (error);
       }
       phdl->model = (kp.p_flag & P_32) ? PR_MODEL_ILP32 : PR_MODEL_LP64;
#else
       phdl->model = PR_MODEL_ILP32;
#endif

       return (0);
}

int
proc_attach(pid_t pid, int flags, struct proc_handle **pphdl)
{
       struct proc_handle *phdl;
       int error = 0;
       int status;

       if (pid == 0 || pid == getpid())
               return (EINVAL);

       /*
        * Allocate memory for the process handle, a structure containing
        * all things related to the process.
        */
       if ((phdl = malloc(sizeof(struct proc_handle))) == NULL)
               return (ENOMEM);

       elf_version(EV_CURRENT);

       error = proc_init(pid, flags, PS_RUN, phdl);
       if (error != 0)
               goto out;

       if (ptrace(PT_ATTACH, phdl->pid, 0, 0) != 0) {
               error = errno;
               DPRINTF("ERROR: cannot ptrace child process %d", pid);
               goto out;
       }

       /* Wait for the child process to stop. */
       if (waitpid(pid, &status, WUNTRACED) == -1) {
               error = errno;
               DPRINTF("ERROR: child process %d didn't stop as expected", pid);
               goto out;
       }

       /* Check for an unexpected status. */
       if (WIFSTOPPED(status) == 0)
               DPRINTFX("ERROR: child process %d status 0x%x", pid, status);
       else
               phdl->status = PS_STOP;

out:
       if (error)
               proc_free(phdl);
       else
               *pphdl = phdl;
       return (error);
}

int
proc_create(const char *file, char * const *argv, proc_child_func *pcf,
   void *child_arg, struct proc_handle **pphdl)
{
       struct proc_handle *phdl;
       int error = 0;
       int status;
       pid_t pid;

       /*
        * Allocate memory for the process handle, a structure containing
        * all things related to the process.
        */
       if ((phdl = malloc(sizeof(struct proc_handle))) == NULL)
               return (ENOMEM);

       elf_version(EV_CURRENT);

       /* Fork a new process. */
       if ((pid = vfork()) == -1)
               error = errno;
       else if (pid == 0) {
               /* The child expects to be traced. */
               if (ptrace(PT_TRACE_ME, 0, 0, 0) != 0)
                       _exit(1);

               if (pcf != NULL)
                       (*pcf)(child_arg);

               /* Execute the specified file: */
               execvp(file, argv);

               /* Couldn't execute the file. */
               _exit(2);
       } else {
               /* The parent owns the process handle. */
               error = proc_init(pid, 0, PS_IDLE, phdl);
               if (error != 0)
                       goto bad;

               /* Wait for the child process to stop. */
               if (waitpid(pid, &status, WUNTRACED) == -1) {
                       error = errno;
                       DPRINTF("ERROR: child process %d didn't stop as expected", pid);
                       goto bad;
               }

               /* Check for an unexpected status. */
               if (WIFSTOPPED(status) == 0) {
                       error = errno;
                       DPRINTFX("ERROR: child process %d status 0x%x", pid, status);
                       goto bad;
               } else
                       phdl->status = PS_STOP;
       }
bad:
       if (error)
               proc_free(phdl);
       else
               *pphdl = phdl;
       return (error);
}

void
proc_free(struct proc_handle *phdl)
{
       free(phdl);
}

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