A few pieces of the future s6-rcd server

20 files changed, 1093 insertions, 0 deletions

diff --git a/src/server/client.c b/src/server/client.c
new file mode 100644
index 0000000..3984553
--- /dev/null
+++ b/src/server/client.c
@@ -0,0 +1,161 @@
+/* ISC license. */
+
+#include <errno.h>
+#include <string.h>
+#include <stdint.h>
+#include <unistd.h>
+
+#include <skalibs/alloc.h>
+#include <skalibs/error.h>
+#include <skalibs/strerr2.h>
+#include <skalibs/tai.h>
+#include <skalibs/djbunix.h>
+#include <skalibs/iopause.h>
+#include <skalibs/textmessage.h>
+
+#include <s6-rc/connection-common.h>
+#include "command.h"
+#include "main.h"
+#include "client.h"
+
+ /*
+    We can't use gensetdyn for client storage, because
+    c->connection.in has a pointer to c->connection.inbuf
+    and gensetdyn can relocate the whole thing on realloc;
+    also, having a sentinel is too costly (client_t is big).
+    So we use an OG linked list, with all the boundary value
+    problems it brings.
+ */
+
+tain_t client_answer_tto = TAIN_INFINITE ;
+client_t *client_head = 0 ;
+uint32_t client_connections = 0 ;
+uint32_t client_monitors = 0 ;
+
+static inline int ismonitored (client_t *c)
+{
+  return textmessage_sender_fd(&c->monitor) >= 0 ;
+}
+
+static inline void client_free (client_t *c)
+{
+  monitor_finish(c) ;
+  fd_close(textmessage_sender_fd(&c->connection.out)) ;
+  textmessage_sender_free(&c->connection.out) ;
+  textmessage_receiver_free(&c->connection.in) ;
+  alloc_free(c) ;
+}
+
+void client_yoink (client_t **c)
+{
+  client_t *prev = (*c)->prev ;
+  if (prev) prev->next = (*c)->next ; else client_head = (*c)->next ;
+  if ((*c)->next) (*c)->next->prev = prev ;
+  if (ismonitored(*c)) nmonitors-- ;
+  client_free(*c) ;
+  *c = prev ;
+  client_connections-- ;
+}
+
+void client_setdeadline (client_t *c)
+{
+  tain_t blah ;
+  tain_half(&blah, &tain_infinite_relative) ;
+  tain_add_g(&blah, &blah) ;
+  if (tain_less(&blah, &c->deadline))
+    tain_add_g(&c->deadline, &client_answer_tto) ;
+}
+
+int client_prepare_iopause (client_t *c, tain_t *deadline, iopause_fd *x, uint32_t *j)
+{
+  if (tain_less(&c->deadline, deadline)) *deadline = c->deadline ;
+  if (!textmessage_sender_isempty(&c->connection.out) || !textmessage_receiver_isempty(&c->connection.in) || (!flags.lameduck && !textmessage_receiver_isfull(&c->connection.in)))
+  {
+    x[*j].fd = textmessage_sender_fd(&c->connection.out) ;
+    x[*j].events = (!textmessage_receiver_isempty(&c->connection.in) || (!flags.lameduck && !textmessage_receiver_isfull(&c->connection.in)) ? IOPAUSE_READ : 0) | (!textmessage_sender_isempty(&c->connection.out) ? IOPAUSE_WRITE : 0) ;
+    c->xindex[0] = (*j)++ ;
+  }
+  else c->xindex[0] = 0 ;
+  if (ismonitored(c) && !textmessage_sender_isempty(&c->monitor))
+  {
+    x[*j].fd = textmessage_sender_fd(&c->monitor) ;
+    x[*j].events = IOPAUSE_WRITE ;
+    c->xindex[1] = (*j)++ ;
+  }
+  else c->xindex[1] = 0 ;
+  return !!c->xindex[0] || !!c->xindex[1] ;
+}
+
+int client_add (int fd, uint8_t perms)
+{
+  client_t *c = alloc(sizeof(client_t)) ;
+  if (!c) return 0 ;
+  c->xindex[0] = c->xindex[1] = 0 ;
+  tain_add_g(&c->deadline, &client_answer_tto) ;
+  c->perms = perms ;
+  c->monitor = textmessage_sender_zero ;
+  textmessage_sender_init(&c->connection.out, fd) ;
+  textmessage_receiver_init(&c->connection.in, fd, &c->connection.inbuf, S6RC_CONNECTION_BUFSIZE) ;
+  c->prev = 0 ;
+  c->next = client_head ;
+  if (c->next) c->next->prev = c ;
+  client_head = c ;
+  client_connections++ ;
+  return 1 ;
+}
+
+int client_flush (client_t *c, iopause_fd const *x)
+{
+  int ok = 1 ;
+  int done = 1 ;
+  if (c->xindex[0] && (x[c->xindex[0]].revents & IOPAUSE_WRITE))
+  {
+    if (!textmessage_sender_flush(&c->connection.out))
+    {
+      done = 0 ;
+      if (!error_isagain(errno)) ok = 0 ;
+    }
+  }
+  if (ismonitored(c) && c->xindex[1] && (x[c->xindex[1]].revents & IOPAUSE_WRITE))
+  {
+    if (!textmessage_sender_flush(&c->monitor))
+    {
+      done = 0 ;
+      if (!error_isagain(errno)) ok = 0 ;
+    }
+  }
+  if (done) tain_add_g(&c->deadline, &tain_infinite_relative) ;
+  return ok ;
+}
+
+int client_read (client_t *c, iopause_fd const *x)
+{
+  return !textmessage_receiver_isempty(&c->connection.in) || (c->xindex[0] && (x[c->xindex[0]].revents & IOPAUSE_READ)) ?
+    textmessage_handle(&c->connection.in, command_handle, c) > 0 : 1 ;
+}
+
+int monitor_init (client_t *c, int fd, unsigned int v)
+{
+  if (ismonitored(c)) return (errno = EINVAL, 0) ;
+  textmessage_sender_init(&c->monitor, fd) ;
+  c->monitor_verbosity = v ;
+  client_monitors++ ;
+  return 1 ;
+}
+
+void monitor_finish (client_t *c)
+{
+  if (!ismonitored(c)) return ;
+  fd_close(textmessage_sender_fd(&c->monitor)) ;
+  textmessage_sender_free(&c->monitor) ;
+  c->monitor = textmessage_sender_zero ;
+  client_monitors-- ;
+}
+
+void monitor_put (unsigned int v, char const *s, size_t len)
+{
+  if (!client_monitors) return ;
+  for (client_t *c = client_head ; c ; c = c->next)
+    if (ismonitored(c) && v >= c->monitor_verbosity && !textmessage_put(&c->monitor, s, len))
+      strerr_diefu1sys("queue message to monitor") ;
+}
diff --git a/src/server/client.h b/src/server/client.h
new file mode 100644
index 0000000..4a6ad6c
--- /dev/null
+++ b/src/server/client.h
@@ -0,0 +1,50 @@
+/* ISC license. */
+
+#ifndef S6RCD_CLIENT_H
+#define S6RCD_CLIENT_H
+
+#include <stdint.h>
+
+#include <skalibs/tai.h>
+#include <skalibs/iopause.h>
+#include <skalibs/textmessage.h>
+
+#include <s6-rc/connection.h>
+
+
+ /* Client connection */
+
+typedef struct client_s client_t, *client_t_ref ;
+struct client_s
+{
+  client_t *prev ;
+  client_t *next ;
+  uint32_t xindex[2] ;
+  tain_t deadline ;
+  s6rc_connection_t connection ;
+  textmessage_sender_t monitor ;
+  unsigned int monitor_verbosity ;
+  uint8_t perms ;
+} ;
+#define CLIENT_ZERO { .next = 0, .xindex = 0, .deadline = TAIN_ZERO, .connection = S6RC_CONNECTION_ZERO, .monitor = TEXTMESSAGE_SENDER_ZERO, .monitor_verbosity = 0, .perms = 0 }
+
+extern tain_t client_answer_tto ;
+extern client_t *client_head ;
+extern uint32_t client_connections ;
+
+extern void client_yoink (client_t **) ;
+extern int client_prepare_iopause (client_t *, tain_t *, iopause_fd *, uint32_t *) ;
+extern int client_flush (client_t *, iopause_fd const *) ;
+extern int client_add (int, uint8_t) ;
+
+extern void client_setdeadline (client_t *) ;
+
+
+ /* Monitors */
+
+extern uint32_t client_monitors ;
+extern int monitor_init (client_t *, int) ;
+extern int monitor_finish (client_t *) ;
+extern int monitor_put (unsigned int, char const *, size_t) ;
+
+#endif
diff --git a/src/server/clientrules.c b/src/server/clientrules.c
new file mode 100644
index 0000000..4050b2f
--- /dev/null
+++ b/src/server/clientrules.c
@@ -0,0 +1,118 @@
+/* ISC license. */
+
+#include <sys/types.h>
+#include <stdint.h>
+
+#include <skalibs/posixplz.h>
+#include <skalibs/bytestr.h>
+#include <skalibs/types.h>
+#include <skalibs/env.h>
+#include <skalibs/strerr2.h>
+#include <skalibs/djbunix.h>
+#include <skalibs/cdb.h>
+
+#include <s6/accessrules.h>
+
+#include "clientrules.h"
+
+static unsigned int rulestype = 0 ;
+static char const *rules = 0 ;
+static int cdbfd = -1 ;
+static struct cdb cdbmap = CDB_ZERO ;
+
+void clientrules_init (unsigned int type, char const *s)
+{
+  rulestype = type ;
+  rules = s ;
+  if (rulestype == 2)
+  {
+    cdbfd = open_readb(rules) ;
+    if (cdbfd < 0) strerr_diefu3sys(111, "open ", rules, " for reading") ;
+    if (cdb_init(&cdbmap, cdbfd) < 0)
+      strerr_diefu2sys(111, "cdb_init ", rules) ;
+  }
+}
+
+void clientrules_reload ()
+{
+  int fd ;
+  struct cdb c = CDB_ZERO ;
+  if (rulestype != 2) break ;
+  fd = open_readb(rules) ;
+  if (fd < 0) break ;
+  if (cdb_init(&c, fd) < 0)
+  {
+    fd_close(fd) ;
+    break ;
+  }
+  cdb_free(&cdbmap) ;
+  fd_close(cdbfd) ;
+  cdbfd = fd ;
+  cdbmap = c ;
+}
+
+static inline uint8_t parse_env (char const *const *envp)
+{
+  uint8_t perms = 0 ;
+  for (; *envp ; envp++)
+  {
+    if (str_start(*envp, "query=")) perms |= 1 ;
+    if (str_start(*envp, "monitor=")) perms |= 2 ;
+    if (str_start(*envp, "change=")) perms |= 4 ;
+    if (str_start(*envp, "event=")) perms |= 8 ;
+    if (str_start(*envp, "admin=")) perms |= 16 ;
+  }
+  return perms ;
+}
+
+int clientrules_check (int fd, uint8_t *perms)
+{
+  s6_accessrules_params_t params = S6_ACCESSRULES_PARAMS_ZERO ;
+  s6_accessrules_result_t result = S6_ACCESSRULES_ERROR ;
+  uid_t uid ;
+  gid_t gid ;
+
+  if (getpeereid(fd, &uid, &gid) < 0)
+  {
+    if (verbosity) strerr_warnwu1sys("getpeereid") ;
+    return 0 ;
+  }
+
+  switch (rulestype)
+  {
+    case 1 :
+      result = s6_accessrules_uidgid_fs(uid, gid, rules, &params) ; break ;
+    case 2 :
+      result = s6_accessrules_uidgid_cdb(uid, gid, &cdbmap, &params) ; break ;
+    default : break ;
+  }
+  if (result != S6_ACCESSRULES_ALLOW)
+  {
+    if (verbosity && (result == S6_ACCESSRULES_ERROR))
+       strerr_warnw1sys("error while checking rules") ;
+    return 0 ;
+  }
+  if (params.exec.len && verbosity)
+  {
+    char fmtuid[UID_FMT] ;
+    char fmtgid[GID_FMT] ;
+    fmtuid[uid_fmt(fmtuid, uid)] = 0 ;
+    fmtgid[gid_fmt(fmtgid, gid)] = 0 ;
+    strerr_warnw4x("unused exec string in rules for uid ", fmtuid, " gid ", fmtgid) ;
+  }
+  if (params.env.s)
+  {
+    size_t n = byte_count(params.env.s, params.env.len, '\0') ;
+    char const *envp[n+1] ;
+    if (!env_make(envp, n, params.env.s, params.env.len))
+    {
+      if (verbosity) strerr_warnwu1sys("env_make") ;
+      s6_accessrules_params_free(&params) ;
+      return 0 ;
+    }
+    envp[n] = 0 ;
+    *perms = parse_env(envp, perms) ;
+  }
+  s6_accessrules_params_free(&params) ;
+  return !!perms ;
+}
diff --git a/src/server/clientrules.h b/src/server/clientrules.h
new file mode 100644
index 0000000..1080d7a
--- /dev/null
+++ b/src/server/clientrules.h
@@ -0,0 +1,15 @@
+/* ISC license. */
+
+#ifndef S6RCD_CLIENTRULES_H
+#define S6RCD_CLIENTRULES_H
+
+#include <stdint.h>
+
+
+ /* Client rules */
+
+extern void clientrules_init (unsigned int, char const *) ;
+extern void clientrules_reload (void) ;
+extern int clientrules_check (int, uint8_t *) ;
+
+#endif
diff --git a/src/server/command.c b/src/server/command.c
new file mode 100644
index 0000000..c52dc8b
--- /dev/null
+++ b/src/server/command.c
@@ -0,0 +1,43 @@
+/* ISC license. */
+
+#include <errno.h>
+#include <sys/uio.h>
+
+#include <skalibs/textmessage.h>
+#include <skalibs/posixishard.h>
+
+#include "client.h"
+#include "command.h"
+
+static int answer (client_t *c, char e)
+{
+  if (!textmessage_put(&c->connection.out, &e, 1)) return 0 ;
+  client_setdeadline(c) ;
+  return 1 ;
+}
+
+static int do_query (client_t *c, char const *s, size_t len)
+{
+  if (!len--) return (errno = EPROTO, 0) ;
+}
+
+static int do_monitor (client_t *c, char const *s, size_t len)
+{
+}
+
+int command_handle (struct iovec const *v, void *aux)
+{
+  client_t *c = aux ;
+  char const *s = v->iov_base ;
+  size_t len = v->iov_len ;
+  if (!len--) return (errno = EPROTO, 0) ;
+  switch (*s++)
+  {
+    case 'Q' : return do_query(c, s, len) ;
+    case 'M' : return do_monitor(c, s, len) ;
+    case '?' : return do_change(c, s, len) ;
+    case '!' : return do_event(c, s, len) ;
+    case '#' : return do_admin(c, s, len) ;
+    default : return do_error(c) ;
+  }
+}
diff --git a/src/server/command.h b/src/server/command.h
new file mode 100644
index 0000000..4edfb09
--- /dev/null
+++ b/src/server/command.h
@@ -0,0 +1,14 @@
+/* ISC license. */
+
+#ifndef S6RCD_COMMAND_H
+#define S6RCD_COMMAND_H
+
+#include <sys/uio.h>
+
+#include <skalibs/textmessage.h>
+
+ /* Client commands */
+
+int command_handle (struct iovec const *, void *) ;
+
+#endif
diff --git a/src/server/db.h b/src/server/db.h
new file mode 100644
index 0000000..efe799d
--- /dev/null
+++ b/src/server/db.h
@@ -0,0 +1,11 @@
+/* ISC license. */
+
+#ifndef S6RCD_DB_H
+#define S6RCD_DB_H
+
+ /* Service database */
+
+extern int s6rcd_db_load (s6rc_db_t *, char const *) ;
+extern int s6rcd_db_read_sizes (s6rc_db_sizes_t *, char const *) ;
+
+#endif
diff --git a/src/server/ep.c b/src/server/ep.c
new file mode 100644
index 0000000..2fa0c0e
--- /dev/null
+++ b/src/server/ep.c
@@ -0,0 +1,128 @@
+/* ISC license. */
+
+#include <stdint.h>
+#include <string.h>
+#include <errno.h>
+
+#include <skalibs/strerr2.h>
+#include <skalibs/genalloc.h>
+#include <skalibs/gensetdyn.h>
+#include <skalibs/avltree.h>
+
+#include <s6-rc/event.h>
+#include "ep.h"
+
+typedef struct epelem_s epelem_t, *epelem_t_ref ;
+struct epelem_s
+{
+  uint32_t owner ;
+  ep_func_t_ref f ;
+  void *aux ;
+} ;
+#define EPELEM_ZERO { .owner = 0, .f = 0, .aux = 0 }
+
+typedef struct eplist_s eplist_t, *eplist_t_ref ;
+struct eplist_s
+{
+  char const *name ;
+  genalloc list ; /* epelem_t */
+} ;
+#define EPLIST_ZERO { .name = 0, .list = GENALLOC_ZERO }
+
+typedef struct epset_s epset_t, *epset_t_ref ;
+struct epset_s
+{
+  gensetdyn data ; /* eplist_t */
+  avltree map ;
+} ;
+#define EPSET_ZERO { .data = GENSETDYN_ZERO, .map = AVLTREE_ZERO }
+
+static void *epset_dtok (uint32_t d, void *x)
+{
+  return (void *)&GENSETDYN_P(eplist_t, (gensetdyn *)x, d)->name ;
+}
+
+static int epset_cmp (void const *a, void const *b, void *x)
+{
+  (void)x ;
+  return strcmp((char const *)a, (char const *)b) ;
+}
+
+static epset_t ep[EVENTTYPE_PHAIL] =
+{
+  { .data = GENSETDYN_ZERO, .map = AVLTREE_INIT(8, 3, 8, &epset_dtok, &epset_cmp, &ep[0].data) },
+  { .data = GENSETDYN_ZERO, .map = AVLTREE_INIT(8, 3, 8, &epset_dtok, &epset_cmp, &ep[1].data) },
+  { .data = GENSETDYN_ZERO, .map = AVLTREE_INIT(8, 3, 8, &epset_dtok, &epset_cmp, &ep[2].data) },
+  { .data = GENSETDYN_ZERO, .map = AVLTREE_INIT(8, 3, 8, &epset_dtok, &epset_cmp, &ep[3].data) },
+  { .data = GENSETDYN_ZERO, .map = AVLTREE_INIT(8, 3, 8, &epset_dtok, &epset_cmp, &ep[4].data) },
+  { .data = GENSETDYN_ZERO, .map = AVLTREE_INIT(8, 3, 8, &epset_dtok, &epset_cmp, &ep[5].data) },
+  { .data = GENSETDYN_ZERO, .map = AVLTREE_INIT(8, 3, 8, &epset_dtok, &epset_cmp, &ep[6].data) },
+} ;
+
+static void eplist_free (void *p)
+{
+  eplist_t *x = p ;
+  genalloc_free(epelem_t, &x->list) ;
+}
+
+void ep_free ()
+{
+  for (s6rc_eventtype_t i = 0 ; i < S6RC_EVENTTYPE_PHAIL ; i++)
+  {
+    avltree_free(&ep[i].map) ;
+    gensetdyn_deepfree(&ep[i].data, &eplist_free) ;
+    avltree_init(&ep[i].map, 8, 3, 8, &epset_dtok, &epset_cmp, &ep[i].data) ;
+  }
+}
+
+int ep_add (uint8_t type, char const *name, uint32_t owner, ep_func_t_ref f, void *aux)
+{
+  epelem_t ee = { .owner = owner, .f = f, .aux = aux } ;
+  uint32_t d ;
+  if (type >= S6RC_EVENTTYPE_PHAIL) return (errno = EINVAL, 0) ;
+  if (!avltree_search(&ep[type].map, name, &d))
+  {
+    eplist_t newlist = { .name = name, .list = GENALLOC_ZERO } ;
+    if (!gensetdyn_new(&ep[type].data, &d)) return 0 ;
+    *GENSETDYN_P(eplist_t, &ep[type].data, d) = newlist ;
+    if (!avltree_insert(&ep[type].map, d))
+    {
+      gensetdyn_delete(&ep[type].data, d) ;
+      return 0 ;
+    }
+  }
+  return genalloc_catb(epelem_t, &GENSETDYN_P(eplist_t, &ep[type].data, d)->list, &ee) ;
+}
+
+void ep_delete (uint8_t type, char const *name, uint32_t owner, ep_func_t_ref f, void *aux)
+{
+  uint32_t d ;
+  if (type >= S6RC_EVENTTYPE_PHAIL) return ;
+  if (!avltree_search(&ep[type].map, name, &d)) return ;
+
+  epelem_t ee = { .owner = owner, .f = f, .aux = aux } ;
+  genalloc *g = &GENSETDYN_P(eplist_t, &ep[type].data, d)->list ;
+  epelem_t *list = genalloc_s(epelem_t, g) ;
+  size_t n = genalloc_len(epelem_t, g) ;
+  size_t i = 0 ;
+  for (; i < n ; i++) if (list == ee) break ;
+  if (i < n) list[i] = list[--n] ;
+  if (!n)
+  {
+    genalloc_free(epelem_t, g) ;
+    avltree_delete(&ep[type].map, name) ;
+    gensetdyn_delete(eplist_t, &ep[type].data, d) ;
+  }
+}
+
+void ep_run (s6rc_event_t const *ev)
+{
+  uint32_t d ;
+  if (!avltree_search(&ep[ev->type].map, ev->name, &d)) return ;
+
+  genalloc *g = &GENSETDYN_P(eplist_t, &ep[ev->type].data, d)->list ;
+  epelem_t const *list = genalloc_s(epelem_t, g) ;
+  size_t n = genalloc_len(epelem_t, g) ;
+  for (size_t i = 0 ; i < n ; i++)
+    (*list[i].f)(ev, list[i].owner, list[i].aux) ;
+}
diff --git a/src/server/ep.h b/src/server/ep.h
new file mode 100644
index 0000000..96e6c59
--- /dev/null
+++ b/src/server/ep.h
@@ -0,0 +1,21 @@
+/* ISC license. */
+
+#ifndef S6RCD_EP_H
+#define S6RCD_EP_H
+
+#include <stdint.h>
+
+#include <s6-rc/event.h>
+
+
+ /* Event processor: the dynamic part */
+
+typedef void ep_func_t (s6rc_event_t const *, uint32_t, void *) ;
+typedef ep_func_t *ep_func_t_ref ;
+
+extern void ep_free (void) ;
+extern int ep_add (uint8_t, char const *, uint32_t, ep_func_t_ref, void *) ;
+extern void ep_delete (uint8_t, char const *, uint32_t, ep_func_t_ref, void *) ;
+extern void ep_run (s6rc_event_t const *) ;
+
+#endif
diff --git a/src/server/ev.c b/src/server/ev.c
new file mode 100644
index 0000000..c201191
--- /dev/null
+++ b/src/server/ev.c
@@ -0,0 +1,47 @@
+/* ISC license. */
+
+#include <skalibs/genqdyn.h>
+
+#include <s6-rc/event.h>
+#include "ev.h"
+
+
+/* Event queue */
+
+static genqdyn evq = GENQDYN_INIT(s6rc_event_t, 0, 1) ;  /* only clean when it's empty */
+
+int ev_enqueue (s6rc_event_t const *ev)
+{
+  return genqdyn_push(&evq, ev) ;
+}
+
+int ev_pop (s6rc_event_t *ev)
+{
+  if (!genqdyn_n(&evq)) return 0 ;
+  *ev = *GENQDYN_PEEK(s6rc_event_t, &evq) ;
+  return genqdyn_pop(&evq) ;
+}
+
+
+ /* Event processing (builtins) */
+
+void ev_handle (s6rc_event_t const *ev)
+{
+  switch (ev->type)
+  {
+    case S6RC_EVENTTYPE_WANTED_STATE_DOWN :
+      break ;
+    case S6RC_EVENTTYPE_WANTED_STATE_UP :
+      break ;
+    case S6RC_EVENTTYPE_CURRENT_STATE_DOWN :
+      break ;
+    case S6RC_EVENTTYPE_CURRENT_STATE_UP :
+      break ;
+    case S6RC_EVENTTYPE_TRANSITION_STOP :
+      break ;
+    case S6RC_EVENTTYPE_TRANSITION_START :
+      break ;
+    case S6RC_EVENTTYPE_CUSTOM :
+      break ;
+  }
+}
diff --git a/src/server/ev.h b/src/server/ev.h
new file mode 100644
index 0000000..c267a40
--- /dev/null
+++ b/src/server/ev.h
@@ -0,0 +1,19 @@
+/* ISC license. */
+
+#ifndef S6RCD_EV_H
+#define S6RCD_EV_H
+
+#include <s6-rc/event.h>
+
+
+ /* Event queue */
+
+extern int ev_enqueue (s6rc_event_t const *) ;
+extern int ev_pop (s6rc_event_t *) ;
+
+
+ /* Event processor: the static part */
+
+extern void ev_handle (s6rc_event_t const *) ;
+
+#endif
diff --git a/src/server/livedir.h b/src/server/livedir.h
new file mode 100644
index 0000000..1d6d106
--- /dev/null
+++ b/src/server/livedir.h
@@ -0,0 +1,11 @@
+/* ISC license. */
+
+#ifndef S6RCD_LIVEDIR_H
+#define S6RCD_LIVEDIR_H
+
+ /* Live directory */
+
+extern int s6rcd_livedir_init (char const *, char const *, char const *, char const *, int *)
+extern int s6rcd_livesubdir_create (char *, char const *, char const *) ;
+
+#endif
diff --git a/src/server/livedir_init.c b/src/server/livedir_init.c
new file mode 100644
index 0000000..f252dba
--- /dev/null
+++ b/src/server/livedir_init.c
@@ -0,0 +1,124 @@
+/* ISC license. */
+
+#include <string.h>
+#include <errno.h>
+#include <unistd.h>
+#include <limits.h>
+#include <stdlib.h>
+#include <sys/stat.h>
+
+#include <skalibs/strerr2.h>
+#include <skalibs/djbunix.h>
+#include <skalibs/webipc.h>
+
+#include "s6rcd.h"
+
+#ifdef NAME_MAX
+# define S6RC_NAME_MAX NAME_MAX
+#else
+# define S6RC_NAME_MAX 63
+#endif
+
+static inline int mksubdirs (char *s)
+{
+  size_t n = strlen(s) ;
+  size_t i = 0 ;
+  for (; i < n ; i++)
+  {
+    if (s[i] == '/')
+    {
+      int r ;
+      s[i] = 0 ;
+      r = mkdir(s, 0755) ;
+      s[i] = '/' ;
+      if (r < 0 && errno != EEXIST) break ;
+    }
+  }
+  return i >= n ;
+}
+
+int s6rcd_livedir_init (char const *livedir, char const *scandir, char const *prefix, char const *compiled, int *sock)
+{
+  size_t plen = strlen(prefix) ;
+  size_t llen = strlen(livedir) ;
+  struct stat st ;
+  char ltmp[llen + 9] ;
+  if (plen >= S6RC_NAME_MAX)
+    strerr_dief1x(100, "prefix is too long") ;
+
+  memcpy(ltmp, livedir, llen + 1) ;
+  if (!mksubdirs(ltmp, len))
+    strerr_diefu2sys(111, "create subdirectories of ", s) ;
+  if (mkdir(ltmp, 0755) < 0 && errno != EEXIST)
+    strerr_diefu2sys(111, "mkdir ", ltmp) ;
+
+  memcpy(ltmp + llen, "/s", 3) ;
+  *sock = ipc_stream() ;
+  if (*sock < 0)
+    strerr_diefu1sys(111, "create socket") ;
+  if (ipc_bind_reuse(*sock, ltmp) < 0)
+    strerr_diefu2sys(111, "bind to ", ltmp) ;
+
+  memcpy(ltmp + llen + 1, "scandir", 8) ;
+  if (lstat(ltmp, &st) < 0)
+  {
+    if (errno != ENOENT)
+      strerr_diefu2sys(111, "lstat ", ltmp) ;
+    if (symlink(scandir, ltmp) < 0)
+      strerr_diefu4sys(111, "symlink ", ltmp, " to ", scandir) ;
+  }
+  else
+  {
+    size_t slen = strlen(scandir) ;
+    char stmp[slen + 1] ;
+    if (!S_ISLNK(st.st_mode))
+      strerr_dief3x(100, "file ", ltmp, " exists and is not a symbolic link") ;
+    if (readlink(ltmp, stmp, slen + 1) < 0)
+      strerr_diefu2sys(111, "readlink ", ltmp) ;
+    if (strncmp(scandir, stmp, slen + 1))
+      strerr_dief4x(100, "provided scandir ", scandir, " does not match the contents of existing ", ltmp) ;
+  }
+
+  memcpy(ltmp + llen + 1, "prefix", 7) ;
+  if (stat(ltmp, &st) < 0)
+  {
+    if (errno != ENOENT)
+      strerr_diefu2sys(111, "stat ", ltmp) ;
+    if (!openwritenclose_unsafe(ltmp, prefix, strlen(prefix)))
+      strerr_diefu2sys(111, "write prefix to ", ltmp) ;
+  }
+  else
+  {
+    if (!S_IFREG(st.st_mode))
+      strerr_dief3x(100, "file ", ltmp, " exists and is not a regular file") ;
+    if (st.st_size != plen)
+      strerr_dief4x(100, "provided prefix ", prefix, " does not match the contents of existing ", ltmp) ;
+    {
+      char stmp[plen] ;
+      ssize_t r = openreadnclose(ltmp, ptmp, plen) ;
+      if (r != plen)
+        strerr_diefu2sys(111, "read ", ltmp) ;
+      if (memcmp(ptmp, prefix, plen))
+      strerr_dief4x(100, "provided prefix ", prefix, " does not match the contents of existing ", ltmp) ;
+    }
+  }
+
+  memcpy(ltmp + llen + 1, "live", 5) ;
+  if (lstat(ltmp, &st) < 0)
+  {
+    char name[12] ;
+    if (errno != ENOENT) strerr_diefu2sys(111, "lstat ", ltmp) ;
+    if (!s6rcd_livesubdir_create(name, live, compiled))
+      strerr_diefu2sys(111, "create live subdirectory in ", live) ;
+    if (symlink(name, ltmp) < 0)
+      strerr_diefu4sys(111, "symlink ", ltmp, " to ", name) ;
+    return 0 ;
+  }
+  if (!S_ISLNK(st.st_mode))
+    strerr_dief3x(100, "livesubdir ", ltmp, " exists and is not a symbolic link") ;
+  if (stat(ltmp, &st) < 0)
+    strerr_diefu2sys(111, "stat ", ltmp) ;
+  if (!S_ISDIR(st.st_mode))
+    strerr_dief4x(100, "livesubdir ", ltmp, " exists and is not a symbolic link", " to a directory") ;
+  return 1 ;
+}
diff --git a/src/server/livesubdir_create.c b/src/server/livesubdir_create.c
new file mode 100644
index 0000000..ff989aa
--- /dev/null
+++ b/src/server/livesubdir_create.c
@@ -0,0 +1,35 @@
+/* ISC license. */
+
+#include <string.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <sys/stat.h>
+
+#include <skalibs/djbunix.h>
+
+#include "s6rcd.h"
+
+int s6rcd_livesubdir_create (char *name, char const *live, char const *compiled)
+{
+  size_t llen = strlen(live) ;
+  size_t clen = strlen(compiled) ;
+  char cfn[clen + 13] ;
+  char lfn[llen + 25] ;
+  memcpy(lfn, live, llen) ;
+  memcpy(lfn + llen, "/live:XXXXXX", 13) ;
+  if (!mkdtemp(lfn)) return 0 ;
+
+  memcpy(lfn + llen + 12, "/compiled", 10) ;
+  if (symlink(compiled, lfn) < 0) return 0 ;
+    strerr_diefu4sys(111, "symlink ", compiled, " to ", realfn + llen + 1) ;
+
+  memcpy(cfn, compiled, clen) ;
+  memcpy(cfn + clen, "/servicedirs", 13) ;
+  memcpy(lfn + llen + 13, "servicedirs", 12) ;
+  if (!hiercopy(cfn, lfn)) return 0 ;
+
+  lfn[llen + 12] = 0 ;
+  if (chmod(lfn, S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH) < 0) return 0 ;
+  memcpy(name, lfn + llen + 1, 12) ;
+  return 1 ;
+}
diff --git a/src/server/main.h b/src/server/main.h
new file mode 100644
index 0000000..84d6688
--- /dev/null
+++ b/src/server/main.h
@@ -0,0 +1,18 @@
+/* ISC license. */
+
+#ifndef S6RCD_MAIN_H
+#define S6RCD_MAIN_H
+
+ /* Exported by the main file, s6-rcd.c */
+
+typedef struct globalflags_s globalflags_t, *globalflags_t_ref ;
+struct globalflags_s
+{
+  uint8_t lameduck : 1 ;
+} ;
+
+extern globalflags_t flags ;
+extern tain_t lameduckdeadline ;
+extern unsigned int verbosity ;
+
+#endif
diff --git a/src/server/s6-rcd.c b/src/server/s6-rcd.c
new file mode 100644
index 0000000..0fcfb77
--- /dev/null
+++ b/src/server/s6-rcd.c
@@ -0,0 +1,139 @@
+/* ISC license. */
+
+#include <fcntl.h>
+
+#include <skalibs/types.h>
+#include <skalibs/strerr2.h>
+#include <skalibs/subgetopt.h>
+#include <skalibs/tai.h>
+#include <skalibs/djbunix.h>
+
+#include "s6-rcd.h"
+
+#define USAGE "s6-rcd [ -v verbosity ] [ -1 ] [ -t timeout ] [ -T lameducktimeout ] [ -i rulesdir | -x rulesfile ] [ -l livedir ]"
+#define dieusage() strerr_dieusage(100, USAGE) ;
+
+unsigned int verbosity = 1 ;
+globalflags_t flags =
+{
+  .lameduck = 0 ;
+} ;
+
+tain_t lameduckdeadline = TAIN_INFINITE_RELATIVE ;
+
+int main (int argc, char const *const *argv)
+{
+  int spfd, sock ;
+  PROG = "s6-rcd" ;
+
+  {
+    char const *rules = 0 ;
+    unsigned int rulestype = 0 ;
+    int flag1 = 0 ;
+    unsigned int t = 0, T = 0 ;
+    subgetopt_t l = SUBGETOPT_ZERO ;
+    for (;;)
+    {
+      int opt = subgetopt_r(argc, argv, "v:1c:n:i:x:t:T:", &l) ;
+      if (opt == -1) break ;
+      switch (opt)
+      {
+        case 'v' : if (!uint0_scan(l.arg, &verbosity)) dieusage() ; break ;
+        case '1' : flag1 = 1 ; break ;
+        case 'i' : rules = l.arg ; rulestype = 1 ; break ;
+        case 'x' : rules = l.arg ; rulestype = 2 ; break ;
+        case 't' : if (!uint0_scan(l.arg, &t)) dieusage() ; break ;
+        case 'T' : if (!uint0_scan(l.arg, &T)) dieusage() ; break ;
+        default : dieusage() ;
+      }
+    }
+    argc -= l.ind ; argv += l.ind ;
+    if (t) tain_from_millisecs(&client_answer_tto, t) ;
+    if (T) tain_from_millisecs(&lameduckdeadline, T) ;
+    if (!rulestype) strerr_dief1x(100, "no access rights specified!") ;
+    if (flag1)
+    {
+      if (fcntl(1, F_GETFD) < 0)
+        strerr_dief1sys(100, "called with option -1 but stdout said") ;
+    }
+    else close(1) ;
+
+    spfd = signals_init() ;
+    clientrules_init(rulestype, rules) ;
+    sock = livedir_init() ;
+    if (!tain_now_set_stopwatch_g())
+      strerr_diefu1sys(111, "initialize clock") ;
+    if (flag1)
+    {
+      fd_write(1, "\n", 1) ;
+      fd_close(1) ;
+    }
+  }
+
+  for (;;)
+  {
+    iopause_fd x[2 + client_connections + client_monitors] ;
+    tain_t deadline ;
+    uint32_t j = 2 ;
+    int r = 1 ;
+
+    {
+      s6rc_event_t ev ;
+      while (ev_pop(&ev)) { ev_handle(&ev) ; ep_run(&ev) ; }
+    }
+
+    tain_add_g(&deadline, &tain_infinite_relative) ;
+    if (flags.lameduck) deadline = lameduckdeadline ;
+
+    x[0].fd = spfd ;
+    x[0].events = IOPAUSE_READ ;
+    x[1].fd = sock ;
+    x[1].events = !flags.lameduck ? IOPAUSE_READ : 0 ;
+
+    for (client_t *c = client_head ; c ; c = c->next)
+      if (client_prepare_iopause(c, &deadline, x, &j)) r = 0 ;
+
+    if (r)  /* clean buffers */
+    {
+      if (flags.lameduck) break ;
+      if (flags.dbupdate && db_update())
+      {
+        flags.dbupdate = 0 ;
+        continue ;
+      }
+    }
+
+    r = iopause_g(x, j, &deadline) ;
+    if (r < 0) strerr_diefu1sys(111, "iopause") ;
+
+    if (!r)
+    {
+      if (flags.lameduck && !tain_future(&lameduckdeadline)) break ;
+      for (client_t *c = client_head ; c ; c = c ? c->next : client_head)
+        if (!tain_future(c->deadline)) client_yoink(&c) ;
+      continue ;
+    }
+
+    if (x[0].revents & IOPAUSE_READ) signals_handle() ;
+
+    for (client_t *c = client_head ; c ; c = c ? c->next : client_head)
+      if (!client_flush(c, x)) client_yoink(&c) ;
+ 
+    for (client_t *c = client_head ; c ; c = c ? c->next : client_head)
+      if (!client_read(c, x)) client_yoink(&c) ;
+
+    if (x[1].revents & IOPAUSE_READ)
+    {
+      uint8_t perms = 0 ;
+      int dummy ;
+      int fd = ipc_accept_nb(x[1].fd, 0, 0, &dummy) ;
+      if (fd < 0)
+        if (!error_isagain(errno)) strerr_diefu1sys(111, "accept connection") ;
+        else continue ;
+      else if (!clientrules_check(fd, &perms)) fd_close(fd) ;
+      else client_add(fd, perms) ;
+    }
+  }
+
+  return 0 ;
+}
diff --git a/src/server/s6-rcd.h b/src/server/s6-rcd.h
new file mode 100644
index 0000000..2436c54
--- /dev/null
+++ b/src/server/s6-rcd.h
@@ -0,0 +1,17 @@
+/* ISC license. */
+
+#ifndef S6RCD_H
+#define S6RCD_H
+
+#include "ep.h"
+#include "ev.h"
+#include "transition.h"
+#include "clientrules.h"
+#include "client.h"
+#include "command.h"
+#include "livedir.h"
+#include "db.h"
+#include "signals.h"
+#include "main.h"
+
+#endif
diff --git a/src/server/signals.c b/src/server/signals.c
new file mode 100644
index 0000000..ce26bdb
--- /dev/null
+++ b/src/server/signals.c
@@ -0,0 +1,89 @@
+/* ISC license. */
+
+#include <errno.h>
+#include <signal.h>
+#include <sys/wait.h>
+
+#include <skalibs/strerr2.h>
+#include <skalibs/sig.h>
+#include <skalibs/selfpipe.h>
+#include <skalibs/tai.h>
+
+#include "clientrules.h"
+#include "transition.h"
+#include "main.h"
+#include "signals.h"
+
+static inline void activate_lameduck (void)
+{
+  if (!flags.lameduck)
+  {
+    flags.lameduck = 1 ;
+    tain_add_g(&lameduckdeadline, &lameduckdeadline) ;
+  }
+}
+
+static inline void reload_config (void)
+{
+  clientrules_reload() ;
+}
+
+static inline void wait_children (void)
+{
+  for (;;)
+  {
+    unsigned int j = 0 ;
+    int wstat ;
+    pid_t r = wait_nohang(&wstat) ;
+    if (r < 0)
+      if (errno == ECHILD) break ;
+      else strerr_diefu1sys(111, "wait for children") ;
+    else if (!r) break ;
+    for (; j < ntransitions ; j++) if (transitions[j].pid == r) break ;
+    if (r < ntransitions)
+    {
+      transition_t tr = transitions[j] ;
+      transitions[j] = transitions[--ntransitions] ;
+      if (!WIFSIGNALED(wstat) && !WEXITSTATUS(wstat))
+        transition_success(&tr) ;
+      else
+        transition_failure(&tr, !!WIFSIGNALED(wstat), WIFSIGNALED(wstat) ? WTERMSIG(wstat) : WEXITSTATUS(wstat)) ;
+    }
+  }
+}
+
+void signals_handle ()
+{
+  for (;;)
+  {
+    switch (selfpipe_read())
+    {
+      case -1 : strerr_diefu1sys(111, "selfpipe_read") ;
+      case 0 : return ;
+      case SIGTERM :
+        activate_lameduck() ;
+        break ;
+      case SIGHUP :
+        reload_config() ;
+        break ;
+      case SIGCHLD :
+        wait_children() ;
+        break ;
+    }
+  }
+}
+
+int signals_init ()
+{
+  int fd = selfpipe_init() ;
+  if (fd < 0) strerr_diefu1sys(111, "selfpipe_init") ;
+  if (sig_ignore(SIGPIPE) < 0) strerr_diefu1sys(111, "ignore SIGPIPE") ;
+  {
+    sigset_t set ;
+    sigemptyset(&set) ;
+    sigaddset(&set, SIGTERM) ;
+    sigaddset(&set, SIGHUP) ;
+    if (selfpipe_trapset(&set) < 0) strerr_diefu1sys(111, "trap signals") ;
+  }
+  return fd ;
+}
diff --git a/src/server/signals.h b/src/server/signals.h
new file mode 100644
index 0000000..b9c167f
--- /dev/null
+++ b/src/server/signals.h
@@ -0,0 +1,11 @@
+/* ISC license. */
+
+#ifndef S6RCD_SIGNALS_H
+#define S6RCD_SIGNALS_H
+
+ /* Signal management */
+
+extern int signals_init (void) ;
+extern void signals_handle (void) ;
+
+#endif
diff --git a/src/server/transition.h b/src/server/transition.h
new file mode 100644
index 0000000..fcddfa6
--- /dev/null
+++ b/src/server/transition.h
@@ -0,0 +1,22 @@
+/* ISC license. */
+
+#ifndef S6RCD_TRANSITION_H
+#define S6RCD_TRANSITION_H
+
+#include <sys/types.h>
+#include <stdint.h>
+
+
+ /* Transitions */
+
+typedef struct transition_s transition_t, *transition_t_ref ;
+struct transition_s
+{
+  pid_t pid ;
+} ;
+#define TRANSITION_ZERO { .pid = 0 }
+
+extern uint32_t ntransitions ;
+transitions_t *transitions ;
+
+#endif