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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-28 09:35:11 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-28 09:35:11 +0000 |
commit | da76459dc21b5af2449af2d36eb95226cb186ce2 (patch) | |
tree | 542ebb3c1e796fac2742495b8437331727bbbfa0 /src/mworker-prog.c | |
parent | Initial commit. (diff) | |
download | haproxy-upstream.tar.xz haproxy-upstream.zip |
Adding upstream version 2.6.12.upstream/2.6.12upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | src/mworker-prog.c | 356 |
1 files changed, 356 insertions, 0 deletions
diff --git a/src/mworker-prog.c b/src/mworker-prog.c new file mode 100644 index 0000000..75cfc42 --- /dev/null +++ b/src/mworker-prog.c @@ -0,0 +1,356 @@ +/* + * 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 = now.tv_sec; + + 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"); + 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); |