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mgt_vcl.c
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mgt_vcl.c
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/*-
* Copyright (c) 2006 Verdens Gang AS
* Copyright (c) 2006-2015 Varnish Software AS
* All rights reserved.
*
* Author: Poul-Henning Kamp <phk@phk.freebsd.dk>
*
* 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 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.
*
* VCL management stuff
*/
#include "config.h"
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/stat.h>
#include "mgt/mgt.h"
#include "libvcc.h"
#include "vcli_serve.h"
#include "vct.h"
#include "vev.h"
#include "vtim.h"
static const char * const VCL_STATE_COLD = "cold";
static const char * const VCL_STATE_WARM = "warm";
static const char * const VCL_STATE_AUTO = "auto";
static const char * const VCL_STATE_LABEL = "label";
struct vclprog;
struct vcldep {
unsigned magic;
#define VCLDEP_MAGIC 0xa9a17dc2
struct vclprog *from;
VTAILQ_ENTRY(vcldep) lfrom;
struct vclprog *to;
VTAILQ_ENTRY(vcldep) lto;
};
struct vclprog {
unsigned magic;
#define VCLPROG_MAGIC 0x9ac09fea
VTAILQ_ENTRY(vclprog) list;
char *name;
char *fname;
unsigned warm;
const char * state;
double go_cold;
VTAILQ_HEAD(, vcldep) dfrom;
VTAILQ_HEAD(, vcldep) dto;
int nto;
int loaded;
};
static VTAILQ_HEAD(, vclprog) vclhead = VTAILQ_HEAD_INITIALIZER(vclhead);
static struct vclprog *active_vcl;
static struct vev *e_poker;
/*--------------------------------------------------------------------*/
static struct vclprog *
mcf_vcl_byname(const char *name)
{
struct vclprog *vp;
VTAILQ_FOREACH(vp, &vclhead, list)
if (!strcmp(name, vp->name))
return (vp);
return (NULL);
}
static int
mcf_bad_vclname(struct cli *cli, const char *name)
{
const char *p;
int bad = 0;
AN(name);
p = name;
if (!vct_isalpha(*p))
bad = *p;
for (p++; bad == 0 && *p != '\0'; p++)
if (!vct_isalpha(*p) &&
!vct_isdigit(*p) &&
*p != '_' &&
*p != '-')
bad = *p;
if (bad) {
VCLI_SetResult(cli, CLIS_PARAM);
VCLI_Out(cli, "Illegal character in VCL name ");
if (bad > 0x20 && bad < 0x7f)
VCLI_Out(cli, "('%c')", bad);
else
VCLI_Out(cli, "(0x%02x)", bad & 0xff);
}
return (bad);
}
static struct vclprog *
mcf_find_vcl(struct cli *cli, const char *name)
{
struct vclprog *vp;
if (mcf_bad_vclname(cli, name))
return (NULL);
vp = mcf_vcl_byname(name);
if (vp == NULL) {
VCLI_SetResult(cli, CLIS_PARAM);
VCLI_Out(cli, "No VCL named %s known.", name);
}
return (vp);
}
static int
mcf_find_no_vcl(struct cli *cli, const char *name)
{
if (mcf_bad_vclname(cli, name))
return (0);
if (mcf_vcl_byname(name) != NULL) {
VCLI_SetResult(cli, CLIS_PARAM);
VCLI_Out(cli, "Already a VCL named %s", name);
return (0);
}
return (1);
}
static int
mcf_is_label(const struct vclprog *vp)
{
return (!strcmp(vp->state, VCL_STATE_LABEL));
}
/*--------------------------------------------------------------------*/
static void
mgt_vcl_dep_add(struct vclprog *vp_from, struct vclprog *vp_to)
{
struct vcldep *vd;
CHECK_OBJ_NOTNULL(vp_from, VCLPROG_MAGIC);
CHECK_OBJ_NOTNULL(vp_to, VCLPROG_MAGIC);
ALLOC_OBJ(vd, VCLDEP_MAGIC);
XXXAN(vd);
vd->from = vp_from;
VTAILQ_INSERT_TAIL(&vp_from->dfrom, vd, lfrom);
vd->to = vp_to;
VTAILQ_INSERT_TAIL(&vp_to->dto, vd, lto);
vp_to->nto++;
}
static void
mgt_vcl_dep_del(struct vcldep *vd)
{
CHECK_OBJ_NOTNULL(vd, VCLDEP_MAGIC);
VTAILQ_REMOVE(&vd->from->dfrom, vd, lfrom);
VTAILQ_REMOVE(&vd->to->dto, vd, lto);
vd->to->nto--;
FREE_OBJ(vd);
}
/*--------------------------------------------------------------------*/
static struct vclprog *
mgt_vcl_add(const char *name, const char *state)
{
struct vclprog *vp;
assert(state == VCL_STATE_WARM ||
state == VCL_STATE_COLD ||
state == VCL_STATE_AUTO ||
state == VCL_STATE_LABEL);
ALLOC_OBJ(vp, VCLPROG_MAGIC);
XXXAN(vp);
REPLACE(vp->name, name);
VTAILQ_INIT(&vp->dfrom);
VTAILQ_INIT(&vp->dto);
vp->state = state;
if (vp->state != VCL_STATE_COLD)
vp->warm = 1;
VTAILQ_INSERT_TAIL(&vclhead, vp, list);
return (vp);
}
static void
mgt_vcl_del(struct vclprog *vp)
{
char *p;
CHECK_OBJ_NOTNULL(vp, VCLPROG_MAGIC);
while (!VTAILQ_EMPTY(&vp->dto))
mgt_vcl_dep_del(VTAILQ_FIRST(&vp->dto));
while (!VTAILQ_EMPTY(&vp->dfrom))
mgt_vcl_dep_del(VTAILQ_FIRST(&vp->dfrom));
VTAILQ_REMOVE(&vclhead, vp, list);
if (vp->fname != NULL) {
AZ(unlink(vp->fname));
p = strrchr(vp->fname, '/');
AN(p);
*p = '\0';
VJ_master(JAIL_MASTER_FILE);
/*
* This will fail if any files are dropped next to the library
* without us knowing. This happens for instance with GCOV.
* Assume developers know how to clean up after themselves
* (or alternatively: How to run out of disk space).
*/
(void)rmdir(vp->fname);
VJ_master(JAIL_MASTER_LOW);
free(vp->fname);
}
free(vp->name);
FREE_OBJ(vp);
}
void
mgt_vcl_depends(struct vclprog *vp1, const char *name)
{
struct vclprog *vp2;
CHECK_OBJ_NOTNULL(vp1, VCLPROG_MAGIC);
vp2 = mcf_vcl_byname(name);
CHECK_OBJ_NOTNULL(vp2, VCLPROG_MAGIC);
mgt_vcl_dep_add(vp1, vp2);
}
int
mgt_has_vcl(void)
{
return (!VTAILQ_EMPTY(&vclhead));
}
static int
mgt_vcl_setstate(struct cli *cli, struct vclprog *vp, const char *vs)
{
unsigned status, warm;
double now;
char *p;
int i;
if (vp == active_vcl || mcf_is_label(vp)) {
AN(vp->warm);
return (0);
}
if (vs == VCL_STATE_AUTO) {
now = VTIM_mono();
vs = vp->warm ? VCL_STATE_WARM : VCL_STATE_COLD;
if (vp->go_cold > 0 && vp->state == VCL_STATE_AUTO &&
vp->go_cold + mgt_param.vcl_cooldown < now)
vs = VCL_STATE_COLD;
}
assert(vs != VCL_STATE_AUTO);
warm = vs == VCL_STATE_WARM ? 1 : 0;
if (vp->warm == warm)
return (0);
vp->warm = warm;
if (vp->warm == 0)
vp->go_cold = 0;
if (child_pid < 0)
return (0);
i = mgt_cli_askchild(&status, &p, "vcl.state %s %d%s\n",
vp->name, vp->warm, vp->state);
if (i) {
AN(cli);
XXXAN(vp->warm); /* XXX: should restart child instead */
VCLI_SetResult(cli, status);
VCLI_Out(cli, "%s", p);
}
free(p);
return (i);
}
/*--------------------------------------------------------------------*/
static void
mgt_new_vcl(struct cli *cli, const char *vclname, const char *vclsrc,
const char *vclsrcfile, const char *state, int C_flag)
{
unsigned status;
char *lib, *p;
struct vclprog *vp;
char buf[32];
AN(cli);
if (C_flag) {
bprintf(buf, ".CflagTest.%d", (int)getpid());
vclname = buf;
}
if (state == NULL)
state = VCL_STATE_AUTO;
else if (!strcmp(state, VCL_STATE_AUTO))
state = VCL_STATE_AUTO;
else if (!strcmp(state, VCL_STATE_COLD))
state = VCL_STATE_COLD;
else if (!strcmp(state, VCL_STATE_WARM))
state = VCL_STATE_WARM;
else {
VCLI_Out(cli, "State must be one of auto, cold or warm.");
VCLI_SetResult(cli, CLIS_PARAM);
return;
}
vp = mgt_vcl_add(vclname, state);
lib = mgt_VccCompile(cli, vp, vclname, vclsrc, vclsrcfile, C_flag);
if (lib == NULL) {
mgt_vcl_del(vp);
return;
}
AZ(C_flag);
vp->fname = lib;
if (active_vcl == NULL)
active_vcl = vp;
if (child_pid < 0)
return;
if (mgt_cli_askchild(&status, &p, "vcl.load %s %s %d%s\n",
vp->name, vp->fname, vp->warm, vp->state)) {
mgt_vcl_del(vp);
VCLI_Out(cli, "%s", p);
VCLI_SetResult(cli, status);
}
free(p);
}
/*--------------------------------------------------------------------*/
void
mgt_vcl_startup(struct cli *cli, const char *b_arg, const char *f_arg,
const char *vclsrc, int C_flag)
{
char buf[BUFSIZ];
if (b_arg == NULL) {
AN(vclsrc);
AN(f_arg);
mgt_new_vcl(cli, "boot", vclsrc, f_arg, NULL, C_flag);
return;
}
AZ(vclsrc);
bprintf(buf,
"vcl 4.0;\n"
"backend default {\n"
" .host = \"%s\";\n"
"}\n", b_arg);
mgt_new_vcl(cli, "boot", buf, "<-b argument>", NULL, C_flag);
}
/*--------------------------------------------------------------------*/
void
mgt_vcl_export_labels(struct vcc *vcc)
{
struct vclprog *vp;
VTAILQ_FOREACH(vp, &vclhead, list) {
if (mcf_is_label(vp))
VCC_Predef(vcc, "VCL_VCL", vp->name);
}
}
/*--------------------------------------------------------------------*/
int
mgt_push_vcls_and_start(struct cli *cli, unsigned *status, char **p)
{
struct vclprog *vp;
struct vcldep *vd;
int done;
AN(active_vcl);
/* The VCL has not been loaded yet, it cannot fail */
AZ(mgt_vcl_setstate(cli, active_vcl, VCL_STATE_WARM));
VTAILQ_FOREACH(vp, &vclhead, list)
vp->loaded = 0;
do {
done = 1;
VTAILQ_FOREACH(vp, &vclhead, list) {
if (vp->loaded)
continue;
VTAILQ_FOREACH(vd, &vp->dfrom, lfrom)
if (!vd->to->loaded)
break;
if (vd != NULL) {
done = 0;
continue;
}
if (mcf_is_label(vp)) {
vd = VTAILQ_FIRST(&vp->dfrom);
AN(vd);
if (mgt_cli_askchild(status, p,
"vcl.label %s %s\n",
vp->name, vd->to->name))
return (1);
} else {
if (mgt_cli_askchild(status, p,
"vcl.load \"%s\" %s %d%s\n",
vp->name, vp->fname, vp->warm, vp->state))
return (1);
}
vp->loaded = 1;
free(*p);
*p = NULL;
}
} while(!done);
if (mgt_cli_askchild(status, p, "vcl.use \"%s\"\n", active_vcl->name))
return (1);
free(*p);
*p = NULL;
if (mgt_cli_askchild(status, p, "start\n"))
return (1);
free(*p);
*p = NULL;
return (0);
}
/*--------------------------------------------------------------------*/
static void __match_proto__(cli_func_t)
mcf_vcl_inline(struct cli *cli, const char * const *av, void *priv)
{
(void)priv;
if (!mcf_find_no_vcl(cli, av[2]))
return;
mgt_new_vcl(cli, av[2], av[3], "<vcl.inline>", av[4], 0);
}
static void __match_proto__(cli_func_t)
mcf_vcl_load(struct cli *cli, const char * const *av, void *priv)
{
(void)priv;
if (!mcf_find_no_vcl(cli, av[2]))
return;
mgt_new_vcl(cli, av[2], NULL, av[3], av[4], 0);
}
static void __match_proto__(cli_func_t)
mcf_vcl_state(struct cli *cli, const char * const *av, void *priv)
{
struct vclprog *vp;
(void)priv;
vp = mcf_find_vcl(cli, av[2]);
if (vp == NULL)
return;
if (mcf_is_label(vp)) {
VCLI_Out(cli, "Labels are always warm");
VCLI_SetResult(cli, CLIS_PARAM);
return;
}
if (!VTAILQ_EMPTY(&vp->dto)) {
AN(strcmp(vp->state, "cold"));
if (!strcmp(av[3], "cold")) {
VCLI_Out(cli, "A labeled VCL cannot be set cold");
VCLI_SetResult(cli, CLIS_CANT);
return;
}
}
if (!strcmp(vp->state, av[3]))
return;
if (!strcmp(av[3], VCL_STATE_AUTO)) {
vp->state = VCL_STATE_AUTO;
if (vp != active_vcl) {
vp->go_cold = VTIM_mono();
(void)mgt_vcl_setstate(cli, vp, VCL_STATE_AUTO);
}
} else if (!strcmp(av[3], VCL_STATE_COLD)) {
if (vp == active_vcl) {
VCLI_Out(cli, "Cannot set the active VCL cold.");
VCLI_SetResult(cli, CLIS_CANT);
return;
}
vp->state = VCL_STATE_AUTO;
(void)mgt_vcl_setstate(cli, vp, VCL_STATE_COLD);
} else if (!strcmp(av[3], VCL_STATE_WARM)) {
if (mgt_vcl_setstate(cli, vp, VCL_STATE_WARM) == 0)
vp->state = VCL_STATE_WARM;
} else {
VCLI_Out(cli, "State must be one of auto, cold or warm.");
VCLI_SetResult(cli, CLIS_PARAM);
}
}
static void __match_proto__(cli_func_t)
mcf_vcl_use(struct cli *cli, const char * const *av, void *priv)
{
unsigned status;
char *p = NULL;
struct vclprog *vp, *vp2;
(void)priv;
vp = mcf_find_vcl(cli, av[2]);
if (vp == NULL)
return;
if (vp == active_vcl)
return;
if (mgt_vcl_setstate(cli, vp, VCL_STATE_WARM))
return;
if (child_pid >= 0 &&
mgt_cli_askchild(&status, &p, "vcl.use %s\n", av[2])) {
VCLI_SetResult(cli, status);
VCLI_Out(cli, "%s", p);
vp->go_cold = VTIM_mono();
(void)mgt_vcl_setstate(cli, vp, VCL_STATE_AUTO);
} else {
VCLI_Out(cli, "VCL '%s' now active", av[2]);
vp2 = active_vcl;
active_vcl = vp;
if (vp2 != NULL) {
vp2->go_cold = VTIM_mono();
(void)mgt_vcl_setstate(cli, vp2, VCL_STATE_AUTO);
}
}
free(p);
}
static void __match_proto__(cli_func_t)
mcf_vcl_discard(struct cli *cli, const char * const *av, void *priv)
{
unsigned status;
char *p = NULL;
struct vclprog *vp;
struct vcldep *vd;
int n;
(void)priv;
vp = mcf_find_vcl(cli, av[2]);
if (vp == NULL)
return;
if (vp == active_vcl) {
VCLI_SetResult(cli, CLIS_CANT);
VCLI_Out(cli, "Cannot discard active VCL program\n");
return;
}
if (!VTAILQ_EMPTY(&vp->dto)) {
VCLI_SetResult(cli, CLIS_CANT);
AN(vp->warm);
if (!mcf_is_label(vp))
VCLI_Out(cli, "Cannot discard labeled VCL program.\n");
else
VCLI_Out(cli,
"Cannot discard this VCL label, "
"other VCLs depend on it.\n");
n = 0;
VTAILQ_FOREACH(vd, &vp->dto, lto) {
if (n++ == 5) {
VCLI_Out(cli, "\t[...]");
break;
}
VCLI_Out(cli, "\t%s\n", vd->from->name);
}
return;
}
if (mcf_is_label(vp))
AN(vp->warm);
else
(void)mgt_vcl_setstate(cli, vp, VCL_STATE_COLD);
if (child_pid >= 0) {
/* XXX If this fails the child is crashing, figure that later */
(void)mgt_cli_askchild(&status, &p, "vcl.discard %s\n", av[2]);
free(p);
}
mgt_vcl_del(vp);
}
static void __match_proto__(cli_func_t)
mcf_vcl_list(struct cli *cli, const char * const *av, void *priv)
{
unsigned status;
char *p;
struct vclprog *vp;
struct vcldep *vd;
/* NB: Shall generate same output as vcl_cli_list() */
(void)av;
(void)priv;
if (child_pid >= 0) {
if (!mgt_cli_askchild(&status, &p, "vcl.list\n")) {
VCLI_SetResult(cli, status);
VCLI_Out(cli, "%s", p);
}
free(p);
} else {
VTAILQ_FOREACH(vp, &vclhead, list) {
VCLI_Out(cli, "%-10s %5s",
vp == active_vcl ? "active" : "available",
vp->state);
VCLI_Out(cli, "/%-8s", vp->warm ?
VCL_STATE_WARM : VCL_STATE_COLD);
VCLI_Out(cli, " %6s %s", "-", vp->name);
if (mcf_is_label(vp)) {
vd = VTAILQ_FIRST(&vp->dfrom);
AN(vd);
VCLI_Out(cli, " -> %s", vd->to->name);
if (vp->nto > 0)
VCLI_Out(cli, " (%d return(vcl)%s)",
vp->nto, vp->nto > 1 ? "'s" : "");
} else if (vp->nto > 0) {
VCLI_Out(cli, " (%d label%s)",
vp->nto, vp->nto > 1 ? "s" : "");
}
VCLI_Out(cli, "\n");
}
}
}
static void __match_proto__(cli_func_t)
mcf_vcl_label(struct cli *cli, const char * const *av, void *priv)
{
struct vclprog *vpl;
struct vclprog *vpt;
unsigned status;
char *p;
int i;
(void)priv;
if (mcf_bad_vclname(cli, av[2]))
return;
if (mcf_bad_vclname(cli, av[3]))
return;
vpt = mcf_find_vcl(cli, av[3]);
if (vpt == NULL)
return;
if (mcf_is_label(vpt)) {
VCLI_SetResult(cli, CLIS_CANT);
VCLI_Out(cli, "VCL labels cannot point to labels");
return;
}
vpl = mcf_vcl_byname(av[2]);
if (vpl != NULL) {
if (!mcf_is_label(vpl)) {
VCLI_SetResult(cli, CLIS_PARAM);
VCLI_Out(cli, "%s is not a label", vpl->name);
return;
}
if (!VTAILQ_EMPTY(&vpt->dfrom) &&
!VTAILQ_EMPTY(&vpl->dto)) {
VCLI_SetResult(cli, CLIS_PARAM);
VCLI_Out(cli, "return(vcl) can only be used from"
" the active VCL.\n\n");
VCLI_Out(cli,
"Label %s is used in return(vcl) from VCL %s\n",
vpl->name, VTAILQ_FIRST(&vpl->dto)->from->name);
VCLI_Out(cli, "and VCL %s also has return(vcl)",
vpt->name);
return;
}
mgt_vcl_dep_del(VTAILQ_FIRST(&vpl->dfrom));
AN(VTAILQ_EMPTY(&vpl->dfrom));
} else {
vpl = mgt_vcl_add(av[2], VCL_STATE_LABEL);
}
AN(vpl);
mgt_vcl_dep_add(vpl, vpt);
vpl->warm = 1;
if (vpt->state == VCL_STATE_COLD)
vpt->state = VCL_STATE_AUTO;
(void)mgt_vcl_setstate(cli, vpt, VCL_STATE_WARM);
if (child_pid < 0)
return;
i = mgt_cli_askchild(&status, &p, "vcl.label %s %s\n", av[2], av[3]);
if (i) {
VCLI_SetResult(cli, status);
VCLI_Out(cli, "%s", p);
}
free(p);
}
/*--------------------------------------------------------------------*/
static int __match_proto__(vev_cb_f)
mgt_vcl_poker(const struct vev *e, int what)
{
struct vclprog *vp;
(void)e;
(void)what;
e_poker->timeout = mgt_param.vcl_cooldown * .45;
VTAILQ_FOREACH(vp, &vclhead, list)
(void)mgt_vcl_setstate(NULL, vp, VCL_STATE_AUTO);
return (0);
}
/*--------------------------------------------------------------------*/
static struct cli_proto cli_vcl[] = {
{ CLICMD_VCL_LOAD, "", mcf_vcl_load },
{ CLICMD_VCL_INLINE, "", mcf_vcl_inline },
{ CLICMD_VCL_USE, "", mcf_vcl_use },
{ CLICMD_VCL_STATE, "", mcf_vcl_state },
{ CLICMD_VCL_DISCARD, "", mcf_vcl_discard },
{ CLICMD_VCL_LIST, "", mcf_vcl_list },
{ CLICMD_VCL_LABEL, "", mcf_vcl_label },
{ NULL }
};
/*--------------------------------------------------------------------*/
static void
mgt_vcl_atexit(void)
{
struct vclprog *vp;
if (getpid() != mgt_pid)
return;
active_vcl = NULL;
do {
vp = VTAILQ_FIRST(&vclhead);
if (vp != NULL)
mgt_vcl_del(vp);
} while (vp != NULL);
}
void
mgt_vcl_init(void)
{
e_poker = vev_new();
AN(e_poker);
e_poker->timeout = 3; // random, prime
e_poker->callback = mgt_vcl_poker;
e_poker->name = "vcl poker";
AZ(vev_add(mgt_evb, e_poker));
AZ(atexit(mgt_vcl_atexit));
VCLS_AddFunc(mgt_cls, MCF_AUTH, cli_vcl);
}