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-rw-r--r--usr.sbin/switchd/proc.c648
1 files changed, 648 insertions, 0 deletions
diff --git a/usr.sbin/switchd/proc.c b/usr.sbin/switchd/proc.c
new file mode 100644
index 00000000000..fb3dfcfa50c
--- /dev/null
+++ b/usr.sbin/switchd/proc.c
@@ -0,0 +1,648 @@
+/* $OpenBSD: proc.c,v 1.1 2016/07/19 16:54:26 reyk Exp $ */
+
+/*
+ * Copyright (c) 2010 - 2014 Reyk Floeter <reyk@openbsd.org>
+ * Copyright (c) 2008 Pierre-Yves Ritschard <pyr@openbsd.org>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <sys/types.h>
+#include <sys/queue.h>
+#include <sys/socket.h>
+#include <sys/wait.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <errno.h>
+#include <signal.h>
+#include <pwd.h>
+#include <event.h>
+#include <imsg.h>
+
+#include "proc.h"
+
+void proc_open(struct privsep *, struct privsep_proc *,
+ struct privsep_proc *, size_t);
+void proc_close(struct privsep *);
+int proc_ispeer(struct privsep_proc *, unsigned int, enum privsep_procid);
+void proc_shutdown(struct privsep_proc *);
+void proc_sig_handler(int, short, void *);
+void proc_range(struct privsep *, enum privsep_procid, int *, int *);
+int proc_dispatch_null(int, struct privsep_proc *, struct imsg *);
+
+int
+proc_ispeer(struct privsep_proc *procs, unsigned int nproc,
+ enum privsep_procid type)
+{
+ unsigned int i;
+
+ for (i = 0; i < nproc; i++)
+ if (procs[i].p_id == type)
+ return (1);
+ return (0);
+}
+
+void
+proc_init(struct privsep *ps, struct privsep_proc *procs, unsigned int nproc)
+{
+ unsigned int i, j, src, dst;
+ struct privsep_pipes *pp;
+
+ /*
+ * Allocate pipes for all process instances (incl. parent)
+ *
+ * - ps->ps_pipes: N:M mapping
+ * N source processes connected to M destination processes:
+ * [src][instances][dst][instances], for example
+ * [PROC_RELAY][3][PROC_CA][3]
+ *
+ * - ps->ps_pp: per-process 1:M part of ps->ps_pipes
+ * Each process instance has a destination array of socketpair fds:
+ * [dst][instances], for example
+ * [PROC_PARENT][0]
+ */
+ for (src = 0; src < PROC_MAX; src++) {
+ /* Allocate destination array for each process */
+ if ((ps->ps_pipes[src] = calloc(ps->ps_ninstances,
+ sizeof(struct privsep_pipes))) == NULL)
+ fatal("proc_init: calloc");
+
+ for (i = 0; i < ps->ps_ninstances; i++) {
+ pp = &ps->ps_pipes[src][i];
+
+ for (dst = 0; dst < PROC_MAX; dst++) {
+ /* Allocate maximum fd integers */
+ if ((pp->pp_pipes[dst] =
+ calloc(ps->ps_ninstances,
+ sizeof(int))) == NULL)
+ fatal("proc_init: calloc");
+
+ /* Mark fd as unused */
+ for (j = 0; j < ps->ps_ninstances; j++)
+ pp->pp_pipes[dst][j] = -1;
+ }
+ }
+ }
+
+ /*
+ * Setup and run the parent and its children
+ */
+ privsep_process = PROC_PARENT;
+ ps->ps_instances[PROC_PARENT] = 1;
+ ps->ps_title[PROC_PARENT] = "parent";
+ ps->ps_pid[PROC_PARENT] = getpid();
+ ps->ps_pp = &ps->ps_pipes[privsep_process][0];
+
+ for (i = 0; i < nproc; i++) {
+ /* Default to 1 process instance */
+ if (ps->ps_instances[procs[i].p_id] < 1)
+ ps->ps_instances[procs[i].p_id] = 1;
+ ps->ps_title[procs[i].p_id] = procs[i].p_title;
+ }
+
+ proc_open(ps, NULL, procs, nproc);
+
+ /* Engage! */
+ for (i = 0; i < nproc; i++)
+ ps->ps_pid[procs[i].p_id] = (*procs[i].p_init)(ps, &procs[i]);
+}
+
+void
+proc_kill(struct privsep *ps)
+{
+ pid_t pid;
+ unsigned int i;
+
+ if (privsep_process != PROC_PARENT)
+ return;
+
+ for (i = 0; i < PROC_MAX; i++) {
+ if (ps->ps_pid[i] == 0)
+ continue;
+ killpg(ps->ps_pid[i], SIGTERM);
+ }
+
+ do {
+ pid = waitpid(WAIT_ANY, NULL, 0);
+ } while (pid != -1 || (pid == -1 && errno == EINTR));
+
+ proc_close(ps);
+}
+
+void
+proc_open(struct privsep *ps, struct privsep_proc *p,
+ struct privsep_proc *procs, size_t nproc)
+{
+ struct privsep_pipes *pa, *pb;
+ int fds[2];
+ unsigned int i, j, src, proc;
+
+ if (p == NULL)
+ src = privsep_process; /* parent */
+ else
+ src = p->p_id;
+
+ /*
+ * Open socket pairs for our peers
+ */
+ for (proc = 0; proc < nproc; proc++) {
+ procs[proc].p_ps = ps;
+ procs[proc].p_env = ps->ps_env;
+ if (procs[proc].p_cb == NULL)
+ procs[proc].p_cb = proc_dispatch_null;
+
+ for (i = 0; i < ps->ps_instances[src]; i++) {
+ for (j = 0; j < ps->ps_instances[procs[proc].p_id];
+ j++) {
+ pa = &ps->ps_pipes[src][i];
+ pb = &ps->ps_pipes[procs[proc].p_id][j];
+
+ /* Check if fds are already set by peer */
+ if (pa->pp_pipes[procs[proc].p_id][j] != -1)
+ continue;
+
+ if (socketpair(AF_UNIX,
+ SOCK_STREAM | SOCK_NONBLOCK,
+ PF_UNSPEC, fds) == -1)
+ fatal("socketpair");
+
+ pa->pp_pipes[procs[proc].p_id][j] = fds[0];
+ pb->pp_pipes[src][i] = fds[1];
+ }
+ }
+ }
+}
+
+void
+proc_listen(struct privsep *ps, struct privsep_proc *procs, size_t nproc)
+{
+ unsigned int i, dst, src, n, m;
+ struct privsep_pipes *pp;
+
+ /*
+ * Close unused pipes
+ */
+ for (src = 0; src < PROC_MAX; src++) {
+ for (n = 0; n < ps->ps_instances[src]; n++) {
+ /* Ingore current process */
+ if (src == (unsigned int)privsep_process &&
+ n == ps->ps_instance)
+ continue;
+
+ pp = &ps->ps_pipes[src][n];
+
+ for (dst = 0; dst < PROC_MAX; dst++) {
+ if (src == dst)
+ continue;
+ for (m = 0; m < ps->ps_instances[dst]; m++) {
+ if (pp->pp_pipes[dst][m] == -1)
+ continue;
+
+ /* Close and invalidate fd */
+ close(pp->pp_pipes[dst][m]);
+ pp->pp_pipes[dst][m] = -1;
+ }
+ }
+ }
+ }
+
+ src = privsep_process;
+ ps->ps_pp = pp = &ps->ps_pipes[src][ps->ps_instance];
+
+ /*
+ * Listen on appropriate pipes
+ */
+ for (i = 0; i < nproc; i++) {
+ dst = procs[i].p_id;
+
+ if (src == dst)
+ fatal("proc_listen: cannot peer with oneself");
+
+ if ((ps->ps_ievs[dst] = calloc(ps->ps_instances[dst],
+ sizeof(struct imsgev))) == NULL)
+ fatal("proc_open");
+
+ for (n = 0; n < ps->ps_instances[dst]; n++) {
+ if (pp->pp_pipes[dst][n] == -1)
+ continue;
+
+ imsg_init(&(ps->ps_ievs[dst][n].ibuf),
+ pp->pp_pipes[dst][n]);
+ ps->ps_ievs[dst][n].handler = proc_dispatch;
+ ps->ps_ievs[dst][n].events = EV_READ;
+ ps->ps_ievs[dst][n].proc = &procs[i];
+ ps->ps_ievs[dst][n].data = &ps->ps_ievs[dst][n];
+ procs[i].p_instance = n;
+
+ event_set(&(ps->ps_ievs[dst][n].ev),
+ ps->ps_ievs[dst][n].ibuf.fd,
+ ps->ps_ievs[dst][n].events,
+ ps->ps_ievs[dst][n].handler,
+ ps->ps_ievs[dst][n].data);
+ event_add(&(ps->ps_ievs[dst][n].ev), NULL);
+ }
+ }
+}
+
+void
+proc_close(struct privsep *ps)
+{
+ unsigned int dst, n;
+ struct privsep_pipes *pp;
+
+ if (ps == NULL)
+ return;
+
+ pp = ps->ps_pp;
+
+ for (dst = 0; dst < PROC_MAX; dst++) {
+ if (ps->ps_ievs[dst] == NULL)
+ continue;
+
+ for (n = 0; n < ps->ps_instances[dst]; n++) {
+ if (pp->pp_pipes[dst][n] == -1)
+ continue;
+
+ /* Cancel the fd, close and invalidate the fd */
+ event_del(&(ps->ps_ievs[dst][n].ev));
+ imsg_clear(&(ps->ps_ievs[dst][n].ibuf));
+ close(pp->pp_pipes[dst][n]);
+ pp->pp_pipes[dst][n] = -1;
+ }
+ free(ps->ps_ievs[dst]);
+ }
+}
+
+void
+proc_shutdown(struct privsep_proc *p)
+{
+ struct privsep *ps = p->p_ps;
+
+ if (p->p_id == PROC_CONTROL && ps)
+ control_cleanup(&ps->ps_csock);
+
+ if (p->p_shutdown != NULL)
+ (*p->p_shutdown)();
+
+ proc_close(ps);
+
+ log_info("%s exiting, pid %d", p->p_title, getpid());
+
+ _exit(0);
+}
+
+void
+proc_sig_handler(int sig, short event, void *arg)
+{
+ struct privsep_proc *p = arg;
+
+ switch (sig) {
+ case SIGINT:
+ case SIGTERM:
+ proc_shutdown(p);
+ break;
+ case SIGCHLD:
+ case SIGHUP:
+ case SIGPIPE:
+ case SIGUSR1:
+ /* ignore */
+ break;
+ default:
+ fatalx("proc_sig_handler: unexpected signal");
+ /* NOTREACHED */
+ }
+}
+
+pid_t
+proc_run(struct privsep *ps, struct privsep_proc *p,
+ struct privsep_proc *procs, unsigned int nproc,
+ void (*run)(struct privsep *, struct privsep_proc *, void *), void *arg)
+{
+ pid_t pid;
+ struct passwd *pw;
+ const char *root;
+ struct control_sock *rcs;
+ unsigned int n;
+
+ if (ps->ps_noaction)
+ return (0);
+
+ proc_open(ps, p, procs, nproc);
+
+ /* Fork child handlers */
+ switch (pid = fork()) {
+ case -1:
+ fatal("proc_run: cannot fork");
+ case 0:
+ log_procinit(p->p_title);
+
+ /* Set the process group of the current process */
+ setpgid(0, 0);
+ break;
+ default:
+ return (pid);
+ }
+
+ pw = ps->ps_pw;
+
+ if (p->p_id == PROC_CONTROL && ps->ps_instance == 0) {
+ if (control_init(ps, &ps->ps_csock) == -1)
+ fatalx(__func__);
+ TAILQ_FOREACH(rcs, &ps->ps_rcsocks, cs_entry)
+ if (control_init(ps, rcs) == -1)
+ fatalx(__func__);
+ }
+
+ /* Change root directory */
+ if (p->p_chroot != NULL)
+ root = p->p_chroot;
+ else
+ root = pw->pw_dir;
+
+ if (chroot(root) == -1)
+ fatal("proc_run: chroot");
+ if (chdir("/") == -1)
+ fatal("proc_run: chdir(\"/\")");
+
+ privsep_process = p->p_id;
+
+ setproctitle("%s", p->p_title);
+
+ if (setgroups(1, &pw->pw_gid) ||
+ setresgid(pw->pw_gid, pw->pw_gid, pw->pw_gid) ||
+ setresuid(pw->pw_uid, pw->pw_uid, pw->pw_uid))
+ fatal("proc_run: cannot drop privileges");
+
+ /* Fork child handlers */
+ for (n = 1; n < ps->ps_instances[p->p_id]; n++) {
+ if (fork() == 0) {
+ ps->ps_instance = p->p_instance = n;
+ break;
+ }
+ }
+
+#ifdef DEBUG
+ log_debug("%s: %s %d/%d, pid %d", __func__, p->p_title,
+ ps->ps_instance + 1, ps->ps_instances[p->p_id], getpid());
+#endif
+
+ event_init();
+
+ signal_set(&ps->ps_evsigint, SIGINT, proc_sig_handler, p);
+ signal_set(&ps->ps_evsigterm, SIGTERM, proc_sig_handler, p);
+ signal_set(&ps->ps_evsigchld, SIGCHLD, proc_sig_handler, p);
+ signal_set(&ps->ps_evsighup, SIGHUP, proc_sig_handler, p);
+ signal_set(&ps->ps_evsigpipe, SIGPIPE, proc_sig_handler, p);
+ signal_set(&ps->ps_evsigusr1, SIGUSR1, proc_sig_handler, p);
+
+ signal_add(&ps->ps_evsigint, NULL);
+ signal_add(&ps->ps_evsigterm, NULL);
+ signal_add(&ps->ps_evsigchld, NULL);
+ signal_add(&ps->ps_evsighup, NULL);
+ signal_add(&ps->ps_evsigpipe, NULL);
+ signal_add(&ps->ps_evsigusr1, NULL);
+
+ proc_listen(ps, procs, nproc);
+
+ if (p->p_id == PROC_CONTROL && ps->ps_instance == 0) {
+ TAILQ_INIT(&ctl_conns);
+ if (control_listen(&ps->ps_csock) == -1)
+ fatalx(__func__);
+ TAILQ_FOREACH(rcs, &ps->ps_rcsocks, cs_entry)
+ if (control_listen(rcs) == -1)
+ fatalx(__func__);
+ }
+
+ if (run != NULL)
+ run(ps, p, arg);
+
+ event_dispatch();
+
+ proc_shutdown(p);
+
+ return (0);
+}
+
+void
+proc_dispatch(int fd, short event, void *arg)
+{
+ struct imsgev *iev = arg;
+ struct privsep_proc *p = iev->proc;
+ struct privsep *ps = p->p_ps;
+ struct imsgbuf *ibuf;
+ struct imsg imsg;
+ ssize_t n;
+ int verbose;
+ const char *title;
+
+ title = ps->ps_title[privsep_process];
+ ibuf = &iev->ibuf;
+
+ if (event & EV_READ) {
+ if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
+ fatal(__func__);
+ if (n == 0) {
+ /* this pipe is dead, so remove the event handler */
+ event_del(&iev->ev);
+ event_loopexit(NULL);
+ return;
+ }
+ }
+
+ if (event & EV_WRITE) {
+ if (msgbuf_write(&ibuf->w) <= 0 && errno != EAGAIN)
+ fatal(__func__);
+ }
+
+ for (;;) {
+ if ((n = imsg_get(ibuf, &imsg)) == -1)
+ fatal(__func__);
+ if (n == 0)
+ break;
+
+#if DEBUG > 1
+ log_debug("%s: %s %d got imsg %d peerid %d from %s %d",
+ __func__, title, ps->ps_instance + 1,
+ imsg.hdr.type, imsg.hdr.peerid, p->p_title, p->p_instance);
+#endif
+
+ /*
+ * Check the message with the program callback
+ */
+ if ((p->p_cb)(fd, p, &imsg) == 0) {
+ /* Message was handled by the callback, continue */
+ imsg_free(&imsg);
+ continue;
+ }
+
+ /*
+ * Generic message handling
+ */
+ switch (imsg.hdr.type) {
+ case IMSG_CTL_VERBOSE:
+ IMSG_SIZE_CHECK(&imsg, &verbose);
+ memcpy(&verbose, imsg.data, sizeof(verbose));
+ log_verbose(verbose);
+ break;
+ default:
+ log_warnx("%s: %s %d got invalid imsg %d peerid %d "
+ "from %s %d",
+ __func__, title, ps->ps_instance + 1,
+ imsg.hdr.type, imsg.hdr.peerid,
+ p->p_title, p->p_instance);
+ fatalx(__func__);
+ }
+ imsg_free(&imsg);
+ }
+ imsg_event_add(iev);
+}
+
+int
+proc_dispatch_null(int fd, struct privsep_proc *p, struct imsg *imsg)
+{
+ return (-1);
+}
+
+/*
+ * imsg helper functions
+ */
+
+void
+imsg_event_add(struct imsgev *iev)
+{
+ if (iev->handler == NULL) {
+ imsg_flush(&iev->ibuf);
+ return;
+ }
+
+ iev->events = EV_READ;
+ if (iev->ibuf.w.queued)
+ iev->events |= EV_WRITE;
+
+ event_del(&iev->ev);
+ event_set(&iev->ev, iev->ibuf.fd, iev->events, iev->handler, iev->data);
+ event_add(&iev->ev, NULL);
+}
+
+int
+imsg_compose_event(struct imsgev *iev, uint16_t type, uint32_t peerid,
+ pid_t pid, int fd, void *data, uint16_t datalen)
+{
+ int ret;
+
+ if ((ret = imsg_compose(&iev->ibuf, type, peerid,
+ pid, fd, data, datalen)) == -1)
+ return (ret);
+ imsg_event_add(iev);
+ return (ret);
+}
+
+int
+imsg_composev_event(struct imsgev *iev, uint16_t type, uint32_t peerid,
+ pid_t pid, int fd, const struct iovec *iov, int iovcnt)
+{
+ int ret;
+
+ if ((ret = imsg_composev(&iev->ibuf, type, peerid,
+ pid, fd, iov, iovcnt)) == -1)
+ return (ret);
+ imsg_event_add(iev);
+ return (ret);
+}
+
+void
+proc_range(struct privsep *ps, enum privsep_procid id, int *n, int *m)
+{
+ if (*n == -1) {
+ /* Use a range of all target instances */
+ *n = 0;
+ *m = ps->ps_instances[id];
+ } else {
+ /* Use only a single slot of the specified peer process */
+ *m = *n + 1;
+ }
+}
+
+int
+proc_compose_imsg(struct privsep *ps, enum privsep_procid id, int n,
+ uint16_t type, uint32_t peerid, int fd, void *data, uint16_t datalen)
+{
+ int m;
+
+ proc_range(ps, id, &n, &m);
+ for (; n < m; n++) {
+ if (imsg_compose_event(&ps->ps_ievs[id][n],
+ type, peerid, 0, fd, data, datalen) == -1)
+ return (-1);
+ }
+
+ return (0);
+}
+
+int
+proc_compose(struct privsep *ps, enum privsep_procid id,
+ uint16_t type, void *data, uint16_t datalen)
+{
+ return (proc_compose_imsg(ps, id, -1, type, -1, -1, data, datalen));
+}
+
+int
+proc_composev_imsg(struct privsep *ps, enum privsep_procid id, int n,
+ uint16_t type, uint32_t peerid, int fd, const struct iovec *iov, int iovcnt)
+{
+ int m;
+
+ proc_range(ps, id, &n, &m);
+ for (; n < m; n++)
+ if (imsg_composev_event(&ps->ps_ievs[id][n],
+ type, peerid, 0, fd, iov, iovcnt) == -1)
+ return (-1);
+
+ return (0);
+}
+
+int
+proc_composev(struct privsep *ps, enum privsep_procid id,
+ uint16_t type, const struct iovec *iov, int iovcnt)
+{
+ return (proc_composev_imsg(ps, id, -1, type, -1, -1, iov, iovcnt));
+}
+
+int
+proc_forward_imsg(struct privsep *ps, struct imsg *imsg,
+ enum privsep_procid id, int n)
+{
+ return (proc_compose_imsg(ps, id, n, imsg->hdr.type,
+ imsg->hdr.peerid, imsg->fd, imsg->data, IMSG_DATA_SIZE(imsg)));
+}
+
+struct imsgbuf *
+proc_ibuf(struct privsep *ps, enum privsep_procid id, int n)
+{
+ int m;
+
+ proc_range(ps, id, &n, &m);
+ return (&ps->ps_ievs[id][n].ibuf);
+}
+
+struct imsgev *
+proc_iev(struct privsep *ps, enum privsep_procid id, int n)
+{
+ int m;
+
+ proc_range(ps, id, &n, &m);
+ return (&ps->ps_ievs[id][n]);
+}
generated by cgit v1.2.3 (git 2.25.1) at 2025-01-19 16:26:42 +0000