/* $OpenBSD: kern_sysctl.c,v 1.29 1999/06/29 23:51:59 provos Exp $ */ /* $NetBSD: kern_sysctl.c,v 1.17 1996/05/20 17:49:05 mrg Exp $ */ /*- * Copyright (c) 1982, 1986, 1989, 1993 * The Regents of the University of California. All rights reserved. * * This code is derived from software contributed to Berkeley by * Mike Karels at Berkeley Software Design, Inc. * * 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. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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. * * @(#)kern_sysctl.c 8.4 (Berkeley) 4/14/94 */ /* * sysctl system call. */ #include <sys/param.h> #include <sys/systm.h> #include <sys/kernel.h> #include <sys/malloc.h> #include <sys/proc.h> #include <sys/resourcevar.h> #include <sys/file.h> #include <sys/vnode.h> #include <sys/unistd.h> #include <sys/buf.h> #include <sys/ioctl.h> #include <sys/tty.h> #include <sys/disklabel.h> #include <vm/vm.h> #include <sys/sysctl.h> #if defined(UVM) #include <uvm/uvm_extern.h> #endif #include <sys/mount.h> #include <sys/syscallargs.h> #include <dev/rndvar.h> #ifdef DDB #include <ddb/db_var.h> #endif /* * Locking and stats */ static struct sysctl_lock { int sl_lock; int sl_want; int sl_locked; } memlock; int sys___sysctl(p, v, retval) struct proc *p; void *v; register_t *retval; { register struct sys___sysctl_args /* { syscallarg(int *) name; syscallarg(u_int) namelen; syscallarg(void *) old; syscallarg(size_t *) oldlenp; syscallarg(void *) new; syscallarg(size_t) newlen; } */ *uap = v; int error, dolock = 1; size_t savelen = 0, oldlen = 0; sysctlfn *fn; int name[CTL_MAXNAME]; if (SCARG(uap, new) != NULL && (error = suser(p->p_ucred, &p->p_acflag))) return (error); /* * all top-level sysctl names are non-terminal */ if (SCARG(uap, namelen) > CTL_MAXNAME || SCARG(uap, namelen) < 2) return (EINVAL); error = copyin(SCARG(uap, name), &name, SCARG(uap, namelen) * sizeof(int)); if (error) return (error); switch (name[0]) { case CTL_KERN: fn = kern_sysctl; if (name[2] == KERN_VNODE) /* XXX */ dolock = 0; break; case CTL_HW: fn = hw_sysctl; break; case CTL_VM: #if defined(UVM) fn = uvm_sysctl; #else fn = vm_sysctl; #endif break; case CTL_NET: fn = net_sysctl; break; case CTL_FS: fn = fs_sysctl; break; case CTL_VFS: fn = vfs_sysctl; break; case CTL_MACHDEP: fn = cpu_sysctl; break; #ifdef DEBUG case CTL_DEBUG: fn = debug_sysctl; break; #endif #ifdef DDB case CTL_DDB: fn = ddb_sysctl; break; #endif default: return (EOPNOTSUPP); } if (SCARG(uap, oldlenp) && (error = copyin(SCARG(uap, oldlenp), &oldlen, sizeof(oldlen)))) return (error); if (SCARG(uap, old) != NULL) { #if defined(UVM) if (!uvm_useracc(SCARG(uap, old), oldlen, B_WRITE)) #else if (!useracc(SCARG(uap, old), oldlen, B_WRITE)) #endif return (EFAULT); while (memlock.sl_lock) { memlock.sl_want = 1; sleep((caddr_t)&memlock, PRIBIO+1); memlock.sl_locked++; } memlock.sl_lock = 1; if (dolock) #if defined(UVM) uvm_vslock(p, SCARG(uap, old), oldlen); #else vslock(SCARG(uap, old), oldlen); #endif savelen = oldlen; } error = (*fn)(name + 1, SCARG(uap, namelen) - 1, SCARG(uap, old), &oldlen, SCARG(uap, new), SCARG(uap, newlen), p); if (SCARG(uap, old) != NULL) { if (dolock) #if defined(UVM) uvm_vsunlock(p, SCARG(uap, old), savelen); #else vsunlock(SCARG(uap, old), savelen); #endif memlock.sl_lock = 0; if (memlock.sl_want) { memlock.sl_want = 0; wakeup((caddr_t)&memlock); } } if (error) return (error); if (SCARG(uap, oldlenp)) error = copyout(&oldlen, SCARG(uap, oldlenp), sizeof(oldlen)); return (error); } /* * Attributes stored in the kernel. */ char hostname[MAXHOSTNAMELEN]; int hostnamelen; char domainname[MAXHOSTNAMELEN]; int domainnamelen; long hostid; #ifdef INSECURE int securelevel = -1; #else int securelevel; #endif /* * kernel related system variables. */ int kern_sysctl(name, namelen, oldp, oldlenp, newp, newlen, p) int *name; u_int namelen; void *oldp; size_t *oldlenp; void *newp; size_t newlen; struct proc *p; { int error, level, inthostid; extern char ostype[], osrelease[], osversion[], version[]; extern int somaxconn, sominconn; extern int usermount, nosuidcoredump; /* all sysctl names at this level are terminal */ if (namelen != 1 && !(name[0] == KERN_PROC || name[0] == KERN_PROF)) return (ENOTDIR); /* overloaded */ switch (name[0]) { case KERN_OSTYPE: return (sysctl_rdstring(oldp, oldlenp, newp, ostype)); case KERN_OSRELEASE: return (sysctl_rdstring(oldp, oldlenp, newp, osrelease)); case KERN_OSREV: return (sysctl_rdint(oldp, oldlenp, newp, OpenBSD)); case KERN_OSVERSION: return (sysctl_rdstring(oldp, oldlenp, newp, osversion)); case KERN_VERSION: return (sysctl_rdstring(oldp, oldlenp, newp, version)); case KERN_MAXVNODES: return(sysctl_int(oldp, oldlenp, newp, newlen, &desiredvnodes)); case KERN_MAXPROC: return (sysctl_int(oldp, oldlenp, newp, newlen, &maxproc)); case KERN_MAXFILES: return (sysctl_int(oldp, oldlenp, newp, newlen, &maxfiles)); case KERN_ARGMAX: return (sysctl_rdint(oldp, oldlenp, newp, ARG_MAX)); case KERN_SECURELVL: level = securelevel; if ((error = sysctl_int(oldp, oldlenp, newp, newlen, &level)) || newp == NULL) return (error); if ((securelevel > 0 || level < -1) && level < securelevel && p->p_pid != 1) return (EPERM); securelevel = level; return (0); case KERN_HOSTNAME: error = sysctl_tstring(oldp, oldlenp, newp, newlen, hostname, sizeof(hostname)); if (newp && !error) hostnamelen = newlen; return (error); case KERN_DOMAINNAME: error = sysctl_tstring(oldp, oldlenp, newp, newlen, domainname, sizeof(domainname)); if (newp && !error) domainnamelen = newlen; return (error); case KERN_HOSTID: inthostid = hostid; /* XXX assumes sizeof long <= sizeof int */ error = sysctl_int(oldp, oldlenp, newp, newlen, &inthostid); hostid = inthostid; return (error); case KERN_CLOCKRATE: return (sysctl_clockrate(oldp, oldlenp)); case KERN_BOOTTIME: return (sysctl_rdstruct(oldp, oldlenp, newp, &boottime, sizeof(struct timeval))); case KERN_VNODE: return (sysctl_vnode(oldp, oldlenp, p)); case KERN_PROC: return (sysctl_doproc(name + 1, namelen - 1, oldp, oldlenp)); case KERN_FILE: return (sysctl_file(oldp, oldlenp)); #ifdef GPROF case KERN_PROF: return (sysctl_doprof(name + 1, namelen - 1, oldp, oldlenp, newp, newlen)); #endif case KERN_POSIX1: return (sysctl_rdint(oldp, oldlenp, newp, _POSIX_VERSION)); case KERN_NGROUPS: return (sysctl_rdint(oldp, oldlenp, newp, NGROUPS_MAX)); case KERN_JOB_CONTROL: return (sysctl_rdint(oldp, oldlenp, newp, 1)); case KERN_SAVED_IDS: #ifdef _POSIX_SAVED_IDS return (sysctl_rdint(oldp, oldlenp, newp, 1)); #else return (sysctl_rdint(oldp, oldlenp, newp, 0)); #endif case KERN_MAXPARTITIONS: return (sysctl_rdint(oldp, oldlenp, newp, MAXPARTITIONS)); case KERN_RAWPARTITION: return (sysctl_rdint(oldp, oldlenp, newp, RAW_PART)); case KERN_NTPTIME: return (sysctl_ntptime(oldp, oldlenp)); case KERN_SOMAXCONN: return (sysctl_int(oldp, oldlenp, newp, newlen, &somaxconn)); case KERN_SOMINCONN: return (sysctl_int(oldp, oldlenp, newp, newlen, &sominconn)); case KERN_USERMOUNT: return (sysctl_int(oldp, oldlenp, newp, newlen, &usermount)); case KERN_RND: return (sysctl_rdstruct(oldp, oldlenp, newp, &rndstats, sizeof(rndstats))); case KERN_ARND: return (sysctl_rdint(oldp, oldlenp, newp, arc4random())); case KERN_NOSUIDCOREDUMP: return (sysctl_int(oldp, oldlenp, newp, newlen, &nosuidcoredump)); case KERN_FSYNC: return (sysctl_rdint(oldp, oldlenp, newp, 1)); case KERN_SYSVMSG: #ifdef SYSVMSG return (sysctl_rdint(oldp, oldlenp, newp, 1)); #else return (sysctl_rdint(oldp, oldlenp, newp, 0)); #endif case KERN_SYSVSEM: #ifdef SYSVSEM return (sysctl_rdint(oldp, oldlenp, newp, 1)); #else return (sysctl_rdint(oldp, oldlenp, newp, 0)); #endif case KERN_SYSVSHM: #ifdef SYSVSHM return (sysctl_rdint(oldp, oldlenp, newp, 1)); #else return (sysctl_rdint(oldp, oldlenp, newp, 0)); #endif default: return (EOPNOTSUPP); } /* NOTREACHED */ } /* * hardware related system variables. */ int hw_sysctl(name, namelen, oldp, oldlenp, newp, newlen, p) int *name; u_int namelen; void *oldp; size_t *oldlenp; void *newp; size_t newlen; struct proc *p; { extern char machine[], cpu_model[]; /* all sysctl names at this level are terminal */ if (namelen != 1) return (ENOTDIR); /* overloaded */ switch (name[0]) { case HW_MACHINE: return (sysctl_rdstring(oldp, oldlenp, newp, machine)); case HW_MODEL: return (sysctl_rdstring(oldp, oldlenp, newp, cpu_model)); case HW_NCPU: return (sysctl_rdint(oldp, oldlenp, newp, 1)); /* XXX */ case HW_BYTEORDER: return (sysctl_rdint(oldp, oldlenp, newp, BYTE_ORDER)); case HW_PHYSMEM: return (sysctl_rdint(oldp, oldlenp, newp, ctob(physmem))); case HW_USERMEM: #if defined(UVM) return (sysctl_rdint(oldp, oldlenp, newp, ctob(physmem - uvmexp.wired))); #else return (sysctl_rdint(oldp, oldlenp, newp, ctob(physmem - cnt.v_wire_count))); #endif case HW_PAGESIZE: return (sysctl_rdint(oldp, oldlenp, newp, PAGE_SIZE)); default: return (EOPNOTSUPP); } /* NOTREACHED */ } #ifdef DEBUG /* * Debugging related system variables. */ struct ctldebug debug0, debug1, debug2, debug3, debug4; struct ctldebug debug5, debug6, debug7, debug8, debug9; struct ctldebug debug10, debug11, debug12, debug13, debug14; struct ctldebug debug15, debug16, debug17, debug18, debug19; static struct ctldebug *debugvars[CTL_DEBUG_MAXID] = { &debug0, &debug1, &debug2, &debug3, &debug4, &debug5, &debug6, &debug7, &debug8, &debug9, &debug10, &debug11, &debug12, &debug13, &debug14, &debug15, &debug16, &debug17, &debug18, &debug19, }; int debug_sysctl(name, namelen, oldp, oldlenp, newp, newlen, p) int *name; u_int namelen; void *oldp; size_t *oldlenp; void *newp; size_t newlen; struct proc *p; { struct ctldebug *cdp; /* all sysctl names at this level are name and field */ if (namelen != 2) return (ENOTDIR); /* overloaded */ cdp = debugvars[name[0]]; if (cdp->debugname == 0) return (EOPNOTSUPP); switch (name[1]) { case CTL_DEBUG_NAME: return (sysctl_rdstring(oldp, oldlenp, newp, cdp->debugname)); case CTL_DEBUG_VALUE: return (sysctl_int(oldp, oldlenp, newp, newlen, cdp->debugvar)); default: return (EOPNOTSUPP); } /* NOTREACHED */ } #endif /* DEBUG */ /* * Validate parameters and get old / set new parameters * for an integer-valued sysctl function. */ int sysctl_int(oldp, oldlenp, newp, newlen, valp) void *oldp; size_t *oldlenp; void *newp; size_t newlen; int *valp; { int error = 0; if (oldp && *oldlenp < sizeof(int)) return (ENOMEM); if (newp && newlen != sizeof(int)) return (EINVAL); *oldlenp = sizeof(int); if (oldp) error = copyout(valp, oldp, sizeof(int)); if (error == 0 && newp) error = copyin(newp, valp, sizeof(int)); return (error); } /* * As above, but read-only. */ int sysctl_rdint(oldp, oldlenp, newp, val) void *oldp; size_t *oldlenp; void *newp; int val; { int error = 0; if (oldp && *oldlenp < sizeof(int)) return (ENOMEM); if (newp) return (EPERM); *oldlenp = sizeof(int); if (oldp) error = copyout((caddr_t)&val, oldp, sizeof(int)); return (error); } /* * Validate parameters and get old / set new parameters * for a string-valued sysctl function. */ int sysctl_string(oldp, oldlenp, newp, newlen, str, maxlen) void *oldp; size_t *oldlenp; void *newp; size_t newlen; char *str; int maxlen; { return sysctl__string(oldp, oldlenp, newp, newlen, str, maxlen, 0); } int sysctl_tstring(oldp, oldlenp, newp, newlen, str, maxlen) void *oldp; size_t *oldlenp; void *newp; size_t newlen; char *str; int maxlen; { return sysctl__string(oldp, oldlenp, newp, newlen, str, maxlen, 1); } int sysctl__string(oldp, oldlenp, newp, newlen, str, maxlen, trunc) void *oldp; size_t *oldlenp; void *newp; size_t newlen; char *str; int maxlen; int trunc; { int len, error = 0; char c; len = strlen(str) + 1; if (oldp && *oldlenp < len) { if (trunc == 0 || *oldlenp == 0) return (ENOMEM); } if (newp && newlen >= maxlen) return (EINVAL); if (oldp) { if (trunc && *oldlenp < len) { /* XXX save & zap NUL terminator while copying */ c = str[*oldlenp-1]; str[*oldlenp-1] = '\0'; error = copyout(str, oldp, *oldlenp); str[*oldlenp-1] = c; } else { *oldlenp = len; error = copyout(str, oldp, len); } } if (error == 0 && newp) { error = copyin(newp, str, newlen); str[newlen] = 0; } return (error); } /* * As above, but read-only. */ int sysctl_rdstring(oldp, oldlenp, newp, str) void *oldp; size_t *oldlenp; void *newp; char *str; { int len, error = 0; len = strlen(str) + 1; if (oldp && *oldlenp < len) return (ENOMEM); if (newp) return (EPERM); *oldlenp = len; if (oldp) error = copyout(str, oldp, len); return (error); } /* * Validate parameters and get old / set new parameters * for a structure oriented sysctl function. */ int sysctl_struct(oldp, oldlenp, newp, newlen, sp, len) void *oldp; size_t *oldlenp; void *newp; size_t newlen; void *sp; int len; { int error = 0; if (oldp && *oldlenp < len) return (ENOMEM); if (newp && newlen > len) return (EINVAL); if (oldp) { *oldlenp = len; error = copyout(sp, oldp, len); } if (error == 0 && newp) error = copyin(newp, sp, len); return (error); } /* * Validate parameters and get old parameters * for a structure oriented sysctl function. */ int sysctl_rdstruct(oldp, oldlenp, newp, sp, len) void *oldp; size_t *oldlenp; void *newp, *sp; int len; { int error = 0; if (oldp && *oldlenp < len) return (ENOMEM); if (newp) return (EPERM); *oldlenp = len; if (oldp) error = copyout(sp, oldp, len); return (error); } /* * Get file structures. */ int sysctl_file(where, sizep) char *where; size_t *sizep; { int buflen, error; struct file *fp; char *start = where; buflen = *sizep; if (where == NULL) { /* * overestimate by 10 files */ *sizep = sizeof(filehead) + (nfiles + 10) * sizeof(struct file); return (0); } /* * first copyout filehead */ if (buflen < sizeof(filehead)) { *sizep = 0; return (0); } error = copyout((caddr_t)&filehead, where, sizeof(filehead)); if (error) return (error); buflen -= sizeof(filehead); where += sizeof(filehead); /* * followed by an array of file structures */ for (fp = filehead.lh_first; fp != 0; fp = fp->f_list.le_next) { if (buflen < sizeof(struct file)) { *sizep = where - start; return (ENOMEM); } error = copyout((caddr_t)fp, where, sizeof (struct file)); if (error) return (error); buflen -= sizeof(struct file); where += sizeof(struct file); } *sizep = where - start; return (0); } /* * try over estimating by 5 procs */ #define KERN_PROCSLOP (5 * sizeof (struct kinfo_proc)) int sysctl_doproc(name, namelen, where, sizep) int *name; u_int namelen; char *where; size_t *sizep; { register struct proc *p; register struct kinfo_proc *dp = (struct kinfo_proc *)where; register int needed = 0; int buflen = where != NULL ? *sizep : 0; int doingzomb; struct eproc eproc; int error = 0; if (namelen != 2 && !(namelen == 1 && name[0] == KERN_PROC_ALL)) return (EINVAL); p = allproc.lh_first; doingzomb = 0; again: for (; p != 0; p = p->p_list.le_next) { /* * Skip embryonic processes. */ if (p->p_stat == SIDL) continue; /* * TODO - make more efficient (see notes below). * do by session. */ switch (name[0]) { case KERN_PROC_PID: /* could do this with just a lookup */ if (p->p_pid != (pid_t)name[1]) continue; break; case KERN_PROC_PGRP: /* could do this by traversing pgrp */ if (p->p_pgrp->pg_id != (pid_t)name[1]) continue; break; case KERN_PROC_TTY: if ((p->p_flag & P_CONTROLT) == 0 || p->p_session->s_ttyp == NULL || p->p_session->s_ttyp->t_dev != (dev_t)name[1]) continue; break; case KERN_PROC_UID: if (p->p_ucred->cr_uid != (uid_t)name[1]) continue; break; case KERN_PROC_RUID: if (p->p_cred->p_ruid != (uid_t)name[1]) continue; break; } if (buflen >= sizeof(struct kinfo_proc)) { fill_eproc(p, &eproc); error = copyout((caddr_t)p, &dp->kp_proc, sizeof(struct proc)); if (error) return (error); error = copyout((caddr_t)&eproc, &dp->kp_eproc, sizeof(eproc)); if (error) return (error); dp++; buflen -= sizeof(struct kinfo_proc); } needed += sizeof(struct kinfo_proc); } if (doingzomb == 0) { p = zombproc.lh_first; doingzomb++; goto again; } if (where != NULL) { *sizep = (caddr_t)dp - where; if (needed > *sizep) return (ENOMEM); } else { needed += KERN_PROCSLOP; *sizep = needed; } return (0); } /* * Fill in an eproc structure for the specified process. */ void fill_eproc(p, ep) register struct proc *p; register struct eproc *ep; { register struct tty *tp; ep->e_paddr = p; ep->e_sess = p->p_pgrp->pg_session; ep->e_pcred = *p->p_cred; ep->e_ucred = *p->p_ucred; if (p->p_stat == SIDL || p->p_stat == SZOMB) { ep->e_vm.vm_rssize = 0; ep->e_vm.vm_tsize = 0; ep->e_vm.vm_dsize = 0; ep->e_vm.vm_ssize = 0; /* ep->e_vm.vm_pmap = XXX; */ } else { register struct vmspace *vm = p->p_vmspace; ep->e_vm.vm_rssize = vm_resident_count(vm); ep->e_vm.vm_tsize = vm->vm_tsize; ep->e_vm.vm_dsize = vm->vm_dsize; ep->e_vm.vm_ssize = vm->vm_ssize; ep->e_vm.vm_pmap = *vm->vm_map.pmap; } if (p->p_pptr) ep->e_ppid = p->p_pptr->p_pid; else ep->e_ppid = 0; ep->e_pgid = p->p_pgrp->pg_id; ep->e_jobc = p->p_pgrp->pg_jobc; if ((p->p_flag & P_CONTROLT) && (tp = ep->e_sess->s_ttyp)) { ep->e_tdev = tp->t_dev; ep->e_tpgid = tp->t_pgrp ? tp->t_pgrp->pg_id : NO_PID; ep->e_tsess = tp->t_session; } else ep->e_tdev = NODEV; ep->e_flag = ep->e_sess->s_ttyvp ? EPROC_CTTY : 0; if (SESS_LEADER(p)) ep->e_flag |= EPROC_SLEADER; if (p->p_wmesg) strncpy(ep->e_wmesg, p->p_wmesg, WMESGLEN); ep->e_xsize = ep->e_xrssize = 0; ep->e_xccount = ep->e_xswrss = 0; strncpy(ep->e_login, ep->e_sess->s_login, MAXLOGNAME-1); ep->e_login[MAXLOGNAME-1] = '\0'; strncpy(ep->e_emul, p->p_emul->e_name, EMULNAMELEN); ep->e_emul[EMULNAMELEN] = '\0'; ep->e_maxrss = p->p_rlimit[RLIMIT_RSS].rlim_cur; }