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-rw-r--r--src/mworker-prog.c359
1 files changed, 359 insertions, 0 deletions
diff --git a/src/mworker-prog.c b/src/mworker-prog.c
new file mode 100644
index 0000000..2734d95
--- /dev/null
+++ b/src/mworker-prog.c
@@ -0,0 +1,359 @@
+/*
+ * Master Worker - program
+ *
+ * Copyright HAProxy Technologies - William Lallemand <wlallemand@haproxy.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ *
+ */
+
+#define _GNU_SOURCE
+
+#include <sys/types.h>
+#include <errno.h>
+#include <grp.h>
+#include <pwd.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+
+#include <haproxy/api.h>
+#include <haproxy/cfgparse.h>
+#include <haproxy/errors.h>
+#include <haproxy/global.h>
+#include <haproxy/mworker.h>
+#include <haproxy/task.h>
+#include <haproxy/time.h>
+#include <haproxy/tools.h>
+
+
+static int use_program = 0; /* do we use the program section ? */
+
+/*
+ * Launch every programs
+ */
+int mworker_ext_launch_all()
+{
+ int ret;
+ struct mworker_proc *child;
+ struct mworker_proc *tmp;
+ int reexec = 0;
+
+ if (!use_program)
+ return 0;
+
+ reexec = getenv("HAPROXY_MWORKER_REEXEC") ? 1 : 0;
+
+ /* find the right mworker_proc */
+ list_for_each_entry_safe(child, tmp, &proc_list, list) {
+ if (child->reloads == 0 && (child->options & PROC_O_TYPE_PROG)) {
+
+ if (reexec && (!(child->options & PROC_O_START_RELOAD))) {
+ struct mworker_proc *old_child;
+
+ /*
+ * This is a reload and we don't want to fork a
+ * new program so have to remove the entry in
+ * the list.
+ *
+ * But before that, we need to mark the
+ * previous program as not leaving, if we find one.
+ */
+
+ list_for_each_entry(old_child, &proc_list, list) {
+ if (!(old_child->options & PROC_O_TYPE_PROG) || (!(old_child->options & PROC_O_LEAVING)))
+ continue;
+
+ if (strcmp(old_child->id, child->id) == 0)
+ old_child->options &= ~PROC_O_LEAVING;
+ }
+
+
+ LIST_DELETE(&child->list);
+ mworker_free_child(child);
+ child = NULL;
+
+ continue;
+ }
+
+ child->timestamp = ns_to_sec(now_ns);
+
+ ret = fork();
+ if (ret < 0) {
+ ha_alert("Cannot fork program '%s'.\n", child->id);
+ exit(EXIT_FAILURE); /* there has been an error */
+ } else if (ret > 0) { /* parent */
+ child->pid = ret;
+ ha_notice("New program '%s' (%d) forked\n", child->id, ret);
+ continue;
+ } else if (ret == 0) {
+ /* In child */
+ mworker_unblock_signals();
+ mworker_cleanlisteners();
+ mworker_cleantasks();
+
+ /* setgid / setuid */
+ if (child->gid != -1) {
+ if (getgroups(0, NULL) > 0 && setgroups(0, NULL) == -1)
+ ha_warning("[%s.main()] Failed to drop supplementary groups. Using 'gid'/'group'"
+ " without 'uid'/'user' is generally useless.\n", child->command[0]);
+
+ if (setgid(child->gid) == -1) {
+ ha_alert("[%s.main()] Cannot set gid %d.\n", child->command[0], child->gid);
+ exit(1);
+ }
+ }
+
+ if (child->uid != -1 && setuid(child->uid) == -1) {
+ ha_alert("[%s.main()] Cannot set uid %d.\n", child->command[0], child->gid);
+ exit(1);
+ }
+
+ /* This one must not be exported, it's internal! */
+ unsetenv("HAPROXY_MWORKER_REEXEC");
+ unsetenv("HAPROXY_STARTUPLOGS_FD");
+ unsetenv("HAPROXY_MWORKER_WAIT_ONLY");
+ unsetenv("HAPROXY_PROCESSES");
+ execvp(child->command[0], child->command);
+
+ ha_alert("Cannot execute %s: %s\n", child->command[0], strerror(errno));
+ exit(EXIT_FAILURE);
+ }
+ }
+ }
+
+ return 0;
+
+}
+
+
+/* Configuration */
+
+int cfg_parse_program(const char *file, int linenum, char **args, int kwm)
+{
+ static struct mworker_proc *ext_child = NULL;
+ struct mworker_proc *child;
+ int err_code = 0;
+
+ if (strcmp(args[0], "program") == 0) {
+ if (alertif_too_many_args(1, file, linenum, args, &err_code)) {
+ err_code |= ERR_ABORT;
+ goto error;
+ }
+
+ if (!*args[1]) {
+ ha_alert("parsing [%s:%d] : '%s' expects an <id> argument\n",
+ file, linenum, args[0]);
+ err_code |= ERR_ALERT | ERR_ABORT;
+ goto error;
+ }
+
+ ext_child = calloc(1, sizeof(*ext_child));
+ if (!ext_child) {
+ ha_alert("parsing [%s:%d] : out of memory.\n", file, linenum);
+ err_code |= ERR_ALERT | ERR_ABORT;
+ goto error;
+ }
+
+ ext_child->options |= PROC_O_TYPE_PROG; /* external process */
+ ext_child->command = NULL;
+ ext_child->path = NULL;
+ ext_child->id = NULL;
+ ext_child->pid = -1;
+ ext_child->reloads = 0;
+ ext_child->timestamp = -1;
+ ext_child->ipc_fd[0] = -1;
+ ext_child->ipc_fd[1] = -1;
+ ext_child->options |= PROC_O_START_RELOAD; /* restart the programs by default */
+ ext_child->uid = -1;
+ ext_child->gid = -1;
+ LIST_INIT(&ext_child->list);
+
+ list_for_each_entry(child, &proc_list, list) {
+ if (child->reloads == 0 && (child->options & PROC_O_TYPE_PROG)) {
+ if (strcmp(args[1], child->id) == 0) {
+ ha_alert("parsing [%s:%d]: '%s' program section already exists in the configuration.\n", file, linenum, args[1]);
+ err_code |= ERR_ALERT | ERR_ABORT;
+ goto error;
+ }
+ }
+ }
+
+ ext_child->id = strdup(args[1]);
+ if (!ext_child->id) {
+ ha_alert("parsing [%s:%d] : out of memory.\n", file, linenum);
+ err_code |= ERR_ALERT | ERR_ABORT;
+ goto error;
+ }
+
+ LIST_APPEND(&proc_list, &ext_child->list);
+
+ } else if (strcmp(args[0], "command") == 0) {
+ int arg_nb = 0;
+ int i = 0;
+
+ if (*(args[1]) == 0) {
+ ha_alert("parsing [%s:%d]: '%s' expects a command with optional arguments separated in words.\n", file, linenum, args[0]);
+ err_code |= ERR_ALERT | ERR_FATAL;
+ goto error;
+ }
+
+ while (*args[arg_nb+1])
+ arg_nb++;
+
+ ext_child->command = calloc(arg_nb+1, sizeof(*ext_child->command));
+
+ if (!ext_child->command) {
+ ha_alert("parsing [%s:%d] : out of memory.\n", file, linenum);
+ err_code |= ERR_ALERT | ERR_ABORT;
+ goto error;
+ }
+
+ while (i < arg_nb) {
+ ext_child->command[i] = strdup(args[i+1]);
+ if (!ext_child->command[i]) {
+ ha_alert("parsing [%s:%d] : out of memory.\n", file, linenum);
+ err_code |= ERR_ALERT | ERR_ABORT;
+ goto error;
+ }
+ i++;
+ }
+ ext_child->command[i] = NULL;
+
+ } else if (strcmp(args[0], "option") == 0) {
+
+ if (*(args[1]) == '\0') {
+ ha_alert("parsing [%s:%d]: '%s' expects an option name.\n",
+ file, linenum, args[0]);
+ err_code |= ERR_ALERT | ERR_FATAL;
+ goto error;
+ }
+
+ if (strcmp(args[1], "start-on-reload") == 0) {
+ if (alertif_too_many_args_idx(0, 1, file, linenum, args, &err_code))
+ goto error;
+ if (kwm == KWM_STD)
+ ext_child->options |= PROC_O_START_RELOAD;
+ else if (kwm == KWM_NO)
+ ext_child->options &= ~PROC_O_START_RELOAD;
+ goto out;
+
+ } else {
+ ha_alert("parsing [%s:%d] : unknown option '%s'.\n", file, linenum, args[1]);
+ err_code |= ERR_ALERT | ERR_FATAL;
+ goto error;
+ }
+ } else if (strcmp(args[0], "user") == 0) {
+ struct passwd *ext_child_user;
+ if (*(args[1]) == '\0') {
+ ha_alert("parsing [%s:%d]: '%s' expects a user name.\n",
+ file, linenum, args[0]);
+ err_code |= ERR_ALERT | ERR_FATAL;
+ goto error;
+ }
+
+ if (alertif_too_many_args(1, file, linenum, args, &err_code))
+ goto error;
+
+ if (ext_child->uid != -1) {
+ ha_alert("parsing [%s:%d] : user/uid already specified. Continuing.\n", file, linenum);
+ err_code |= ERR_ALERT;
+ goto out;
+ }
+
+ ext_child_user = getpwnam(args[1]);
+ if (ext_child_user != NULL) {
+ ext_child->uid = (int)ext_child_user->pw_uid;
+ } else {
+ ha_alert("parsing [%s:%d] : cannot find user id for '%s' (%d:%s)\n", file, linenum, args[1], errno, strerror(errno));
+ err_code |= ERR_ALERT | ERR_FATAL;
+ }
+ } else if (strcmp(args[0], "group") == 0) {
+ struct group *ext_child_group;
+ if (*(args[1]) == '\0') {
+ ha_alert("parsing [%s:%d]: '%s' expects a group name.\n",
+ file, linenum, args[0]);
+ err_code |= ERR_ALERT | ERR_FATAL;
+ goto error;
+ }
+
+ if (alertif_too_many_args(1, file, linenum, args, &err_code))
+ goto error;
+
+ if (ext_child->gid != -1) {
+ ha_alert("parsing [%s:%d] : group/gid already specified. Continuing.\n", file, linenum);
+ err_code |= ERR_ALERT;
+ goto out;
+ }
+
+ ext_child_group = getgrnam(args[1]);
+ if (ext_child_group != NULL) {
+ ext_child->gid = (int)ext_child_group->gr_gid;
+ } else {
+ ha_alert("parsing [%s:%d] : cannot find group id for '%s' (%d:%s)\n", file, linenum, args[1], errno, strerror(errno));
+ err_code |= ERR_ALERT | ERR_FATAL;
+ }
+ } else {
+ ha_alert("parsing [%s:%d] : unknown keyword '%s' in '%s' section\n", file, linenum, args[0], "program");
+ err_code |= ERR_ALERT | ERR_FATAL;
+ goto error;
+ }
+
+ use_program = 1;
+
+ return err_code;
+
+error:
+ if (ext_child) {
+ LIST_DELETE(&ext_child->list);
+ if (ext_child->command) {
+ int i;
+
+ for (i = 0; ext_child->command[i]; i++) {
+ ha_free(&ext_child->command[i]);
+ }
+ ha_free(&ext_child->command);
+ }
+ ha_free(&ext_child->id);
+ }
+
+ ha_free(&ext_child);
+
+out:
+ return err_code;
+
+}
+
+int cfg_program_postparser()
+{
+ int err_code = 0;
+ struct mworker_proc *child;
+
+ /* we only need to check this during configuration parsing,
+ * wait mode doesn't have the complete description of a program */
+ if (global.mode & MODE_MWORKER_WAIT)
+ return err_code;
+
+ list_for_each_entry(child, &proc_list, list) {
+ if (child->reloads == 0 && (child->options & PROC_O_TYPE_PROG)) {
+ if (child->command == NULL) {
+ ha_alert("The program section '%s' lacks a command to launch.\n", child->id);
+ err_code |= ERR_ALERT | ERR_FATAL;
+ }
+ }
+ }
+
+ if (use_program && !(global.mode & MODE_MWORKER)) {
+ ha_alert("Can't use a 'program' section without master worker mode.\n");
+ err_code |= ERR_ALERT | ERR_FATAL;
+ }
+
+ return err_code;
+}
+
+
+REGISTER_CONFIG_SECTION("program", cfg_parse_program, NULL);
+REGISTER_CONFIG_POSTPARSER("program", cfg_program_postparser);
generated by cgit v1.2.3 (git 2.39.1) at 2024-05-15 21:25:36 +0000