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MINOR: debug/cli: add some debugging commands for developers
When haproxy is built with DEBUG_DEV, the following commands are added to the CLI : debug dev close <fd> : close this file descriptor debug dev delay [ms] : sleep this long debug dev exec [cmd] ... : show this command's output debug dev exit [code] : immediately exit the process debug dev hex <addr> [len]: dump a memory area debug dev log [msg] ... : send this msg to global logs debug dev loop [ms] : loop this long debug dev panic : immediately trigger a panic debug dev tkill [thr] [sig] : send signal to thread These are essentially aimed at helping developers trigger certain conditions and are expected to be complemented over time.
This commit is contained in:
Willy Tarreau
parent
56131ca58e
commit
6bdf3e9b11
4
Makefile
4
Makefile
@ -209,8 +209,8 @@ SMALL_OPTS =
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#### Debug settings
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# You can enable debugging on specific code parts by setting DEBUG=-DDEBUG_xxx.
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# Currently defined DEBUG macros include DEBUG_FULL, DEBUG_MEMORY, DEBUG_FSM,
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# DEBUG_HASH, DEBUG_AUTH, DEBUG_SPOE, DEBUG_UAF and DEBUG_THREAD. Please check
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# sources for exact meaning or do not use at all.
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# DEBUG_HASH, DEBUG_AUTH, DEBUG_SPOE, DEBUG_UAF and DEBUG_THREAD, DEBUG_STRICT,
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# DEBUG_DEV. Please check sources for exact meaning or do not use at all.
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DEBUG =
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#### Trace options
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@ -1454,6 +1454,12 @@ clear table <table> [ data.<type> <operator> <value> ] | [ key <key> ]
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$ echo "show table http_proxy" | socat stdio /tmp/sock1
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>>> # table: http_proxy, type: ip, size:204800, used:1
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debug dev <command> [args]*
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Call a developer-specific command. Only supported when haproxy is built with
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DEBUG_DEV defined. Supported commands are then listed in the help message.
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All of these commands require admin privileges, and must never appear on a
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production system as most of them are unsafe and dangerous.
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del acl <acl> [<key>|#<ref>]
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Delete all the acl entries from the acl <acl> corresponding to the key <key>.
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<acl> is the #<id> or the <file> returned by "show acl". If the <ref> is used,
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234
src/debug.c
234
src/debug.c
@ -13,6 +13,7 @@
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#include <signal.h>
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#include <time.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <common/buf.h>
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#include <common/config.h>
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@ -147,6 +148,228 @@ void ha_panic()
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abort();
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}
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#if defined(DEBUG_DEV)
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/* parse a "debug dev exit" command. It always returns 1, though it should never return. */
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static int debug_parse_cli_exit(char **args, char *payload, struct appctx *appctx, void *private)
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{
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int code = atoi(args[3]);
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if (!cli_has_level(appctx, ACCESS_LVL_ADMIN))
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return 1;
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exit(code);
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return 1;
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}
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/* parse a "debug dev close" command. It always returns 1. */
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static int debug_parse_cli_close(char **args, char *payload, struct appctx *appctx, void *private)
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{
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int fd;
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if (!cli_has_level(appctx, ACCESS_LVL_ADMIN))
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return 1;
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if (!*args[3]) {
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appctx->ctx.cli.msg = "Missing file descriptor number.\n";
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goto reterr;
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}
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fd = atoi(args[3]);
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if (fd < 0 || fd >= global.maxsock) {
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appctx->ctx.cli.msg = "File descriptor out of range.\n";
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goto reterr;
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}
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if (!fdtab[fd].owner) {
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appctx->ctx.cli.msg = "File descriptor was already closed.\n";
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goto retinfo;
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}
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fd_delete(fd);
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return 1;
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retinfo:
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appctx->ctx.cli.severity = LOG_INFO;
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appctx->st0 = CLI_ST_PRINT;
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return 1;
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reterr:
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appctx->ctx.cli.severity = LOG_ERR;
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appctx->st0 = CLI_ST_PRINT;
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return 1;
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}
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/* parse a "debug dev delay" command. It always returns 1. */
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static int debug_parse_cli_delay(char **args, char *payload, struct appctx *appctx, void *private)
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{
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int delay = atoi(args[3]);
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if (!cli_has_level(appctx, ACCESS_LVL_ADMIN))
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return 1;
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usleep((long)delay * 1000);
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return 1;
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}
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/* parse a "debug dev log" command. It always returns 1. */
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static int debug_parse_cli_log(char **args, char *payload, struct appctx *appctx, void *private)
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{
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int arg;
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if (!cli_has_level(appctx, ACCESS_LVL_ADMIN))
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return 1;
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chunk_reset(&trash);
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for (arg = 3; *args[arg]; arg++) {
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if (arg > 3)
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chunk_strcat(&trash, " ");
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chunk_strcat(&trash, args[arg]);
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}
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send_log(NULL, LOG_INFO, "%s\n", trash.area);
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return 1;
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}
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/* parse a "debug dev loop" command. It always returns 1. */
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static int debug_parse_cli_loop(char **args, char *payload, struct appctx *appctx, void *private)
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{
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struct timeval deadline, curr;
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int loop = atoi(args[3]);
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if (!cli_has_level(appctx, ACCESS_LVL_ADMIN))
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return 1;
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gettimeofday(&curr, NULL);
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tv_ms_add(&deadline, &curr, loop);
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while (tv_ms_cmp(&curr, &deadline) < 0)
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gettimeofday(&curr, NULL);
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return 1;
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}
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/* parse a "debug dev panic" command. It always returns 1, though it should never return. */
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static int debug_parse_cli_panic(char **args, char *payload, struct appctx *appctx, void *private)
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{
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if (!cli_has_level(appctx, ACCESS_LVL_ADMIN))
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return 1;
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ha_panic();
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return 1;
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}
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/* parse a "debug dev exec" command. It always returns 1. */
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static int debug_parse_cli_exec(char **args, char *payload, struct appctx *appctx, void *private)
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{
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FILE *f;
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int arg;
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if (!cli_has_level(appctx, ACCESS_LVL_ADMIN))
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return 1;
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chunk_reset(&trash);
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for (arg = 3; *args[arg]; arg++) {
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if (arg > 3)
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chunk_strcat(&trash, " ");
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chunk_strcat(&trash, args[arg]);
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}
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f = popen(trash.area, "re");
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if (!f) {
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appctx->ctx.cli.severity = LOG_ERR;
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appctx->ctx.cli.msg = "Failed to execute command.\n";
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appctx->st0 = CLI_ST_PRINT;
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return 1;
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}
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chunk_reset(&trash);
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while (1) {
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size_t ret = fread(trash.area + trash.data, 1, trash.size - 20 - trash.data, f);
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if (!ret)
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break;
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trash.data += ret;
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if (trash.data + 20 == trash.size) {
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chunk_strcat(&trash, "\n[[[TRUNCATED]]]\n");
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break;
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}
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}
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fclose(f);
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trash.area[trash.data] = 0;
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appctx->ctx.cli.severity = LOG_INFO;
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appctx->ctx.cli.msg = trash.area;
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appctx->st0 = CLI_ST_PRINT;
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return 1;
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}
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/* parse a "debug dev hex" command. It always returns 1. */
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static int debug_parse_cli_hex(char **args, char *payload, struct appctx *appctx, void *private)
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{
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unsigned long start, len;
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if (!cli_has_level(appctx, ACCESS_LVL_ADMIN))
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return 1;
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if (!*args[3]) {
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appctx->ctx.cli.msg = "Missing memory address to dump from.\n";
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goto reterr;
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}
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start = strtoul(args[3], NULL, 0);
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if (!start) {
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appctx->ctx.cli.msg = "Will not dump from NULL address.\n";
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goto reterr;
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}
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/* by default, dump ~128 till next block of 16 */
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len = strtoul(args[4], NULL, 0);
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if (!len)
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len = ((start + 128) & -16) - start;
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chunk_reset(&trash);
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dump_hex(&trash, " ", (const void *)start, len);
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trash.area[trash.data] = 0;
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appctx->ctx.cli.severity = LOG_INFO;
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appctx->ctx.cli.msg = trash.area;
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appctx->st0 = CLI_ST_PRINT;
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return 1;
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reterr:
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appctx->ctx.cli.severity = LOG_ERR;
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appctx->st0 = CLI_ST_PRINT;
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return 1;
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}
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/* parse a "debug dev tkill" command. It always returns 1. */
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static int debug_parse_cli_tkill(char **args, char *payload, struct appctx *appctx, void *private)
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{
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int thr = 0;
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int sig = SIGABRT;
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if (!cli_has_level(appctx, ACCESS_LVL_ADMIN))
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return 1;
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if (*args[3])
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thr = atoi(args[3]);
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if (thr < 0 || thr > global.nbthread) {
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appctx->ctx.cli.severity = LOG_ERR;
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appctx->ctx.cli.msg = "Thread number out of range (use 0 for current).\n";
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appctx->st0 = CLI_ST_PRINT;
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return 1;
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}
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if (*args[4])
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sig = atoi(args[4]);
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#if defined(USE_THREAD)
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if (thr)
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pthread_kill(thread_info[thr-1].pthread, sig);
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else
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#endif
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raise(sig);
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return 1;
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}
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#endif
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#ifndef USE_THREAD_DUMP
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/* This function dumps all threads' state to the trash. This version is the
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@ -271,6 +494,17 @@ REGISTER_PER_THREAD_INIT(init_debug_per_thread);
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/* register cli keywords */
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static struct cli_kw_list cli_kws = {{ },{
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#if defined(DEBUG_DEV)
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{{ "debug", "dev", "close", NULL }, "debug dev close <fd> : close this file descriptor", debug_parse_cli_close, NULL },
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{{ "debug", "dev", "delay", NULL }, "debug dev delay [ms] : sleep this long", debug_parse_cli_delay, NULL },
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{{ "debug", "dev", "exec", NULL }, "debug dev exec [cmd] ... : show this command's output", debug_parse_cli_exec, NULL },
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{{ "debug", "dev", "exit", NULL }, "debug dev exit [code] : immediately exit the process", debug_parse_cli_exit, NULL },
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{{ "debug", "dev", "hex", NULL }, "debug dev hex <addr> [len]: dump a memory area", debug_parse_cli_hex, NULL },
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{{ "debug", "dev", "log", NULL }, "debug dev log [msg] ... : send this msg to global logs", debug_parse_cli_log, NULL },
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{{ "debug", "dev", "loop", NULL }, "debug dev loop [ms] : loop this long", debug_parse_cli_loop, NULL },
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{{ "debug", "dev", "panic", NULL }, "debug dev panic : immediately trigger a panic", debug_parse_cli_panic, NULL },
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{{ "debug", "dev", "tkill", NULL }, "debug dev tkill [thr] [sig] : send signal to thread", debug_parse_cli_tkill, NULL },
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#endif
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{ { "show", "threads", NULL }, "show threads : show some threads debugging information", NULL, cli_io_handler_show_threads, NULL },
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{{},}
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}};
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