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/*
* Get or set RPC debug flags.
*
* I would have loved to write this without recourse to the sysctl
* interface, but the only plausible approach (reading and writing
* /dev/kmem at the offsets indicated by the _debug symbols from
* /proc/ksyms) didn't work, because /dev/kmem doesn't translate virtual
* addresses on write. Unfortunately, modules are stuffed into memory
* allocated via vmalloc.
*
* Copyright (C) 1996, 1997, Olaf Kirch <okir@monad.swb.de>
* (C) 2004 <frederic.jolly@bull.ext.net>
*
* 06/15/2004: updated for NFSv4
*
*/
/* #include "config.h" */
#include <sys/types.h>
#include <stdio.h>
#include <stdlib.h>
#include <getopt.h>
#include <unistd.h>
#include <string.h>
#include <malloc.h>
#include <fcntl.h>
#include <ctype.h>
/* RPC debug flags
#include <sunrpc/debug.h> */
/* NFS debug flags
#include <nfs_fs.h> */
/* NFSD and NLM debug flags
#include <nfsd/debug.h> */
#include <nfs/debug.h>
static int verbose = 0;
static char* cdename;
static unsigned int find_flag(char **module, char *name);
static unsigned int get_flags(char *);
static unsigned int set_flags(char *, unsigned int value);
static void print_flags(FILE *, char *, unsigned int, int);
static char * strtolower(char *str);
static void usage(int excode, char *module);
int
main(int argc, char **argv)
{
int opt_s = 0,
opt_c = 0;
unsigned int flags = 0, oflags;
char * module = NULL;
int c;
cdename = malloc(strlen(basename(argv[0])));
if (cdename == NULL) {
fprintf(stderr, "failed in malloc\n");
exit(1);
}
strcpy(cdename, basename(argv[0]));
if (!strcmp(cdename, "nfsdebug")) {
module = "nfs";
}
else if (!strcmp(cdename, "nfsddebug")) {
module = "nfsd";
}
while ((c = getopt(argc, argv, "chm:sv")) != EOF) {
switch (c) {
case 'c':
opt_c = 1;
break;
case 'h':
usage(0, module);
case 'm':
module = optarg;
break;
case 's':
opt_s = 1;
break;
case 'v':
verbose++;
break;
default:
fprintf(stderr, "%s: unknown option -%c\n", cdename, optopt);
usage(1, module);
}
}
if (opt_c + opt_s > 1) {
fprintf(stderr, "You can use at most one of -c and -s\n");
usage(1, module);
}
if (!module) {
fprintf(stderr, "%s: no module name specified.\n", cdename);
usage(1, module);
}
if (strcmp(module, "nfsd") &&
strcmp(module, "nfs") &&
strcmp(module, "nlm") &&
strcmp(module, "rpc")) {
fprintf(stderr, "%s: unknown module: %s\n", cdename, module);
usage(1, module);
}
if (argc == optind) {
flags = ~(unsigned int) 0;
} else {
for (; optind < argc; optind++)
flags |= find_flag(&module, argv[optind]);
if (flags && !opt_c)
opt_s = 1;
}
oflags = get_flags(module);
if (opt_c) {
oflags = set_flags(module, oflags & ~flags);
} else if (opt_s) {
oflags = set_flags(module, oflags | flags);
}
print_flags(stdout, module, oflags, 0);
if (verbose) {
fprintf(stdout, "\nModule Valid flags\n");
print_flags(stdout, module, ~(unsigned int) 0, 1);
}
return 0;
}
#define FLAG(mname, fname) \
{ #mname, #fname, mname##DBG_##fname }
static struct flagmap {
char * module;
char * name;
unsigned int value;
} flagmap[] = {
/* rpc */
FLAG(RPC, XPRT),
FLAG(RPC, CALL),
FLAG(RPC, DEBUG),
FLAG(RPC, NFS),
FLAG(RPC, AUTH),
FLAG(RPC, PMAP),
FLAG(RPC, SCHED),
FLAG(RPC, TRANS),
FLAG(RPC, SVCSOCK),
FLAG(RPC, SVCDSP),
FLAG(RPC, MISC),
FLAG(RPC, CACHE),
FLAG(RPC, ALL),
/* nfs */
FLAG(NFS, VFS),
FLAG(NFS, DIRCACHE),
FLAG(NFS, LOOKUPCACHE),
FLAG(NFS, PAGECACHE),
FLAG(NFS, PROC),
FLAG(NFS, XDR),
FLAG(NFS, FILE),
FLAG(NFS, ROOT),
FLAG(NFS, CALLBACK),
FLAG(NFS, ALL),
/* nfsd */
FLAG(NFSD, SOCK),
FLAG(NFSD, FH),
FLAG(NFSD, EXPORT),
FLAG(NFSD, SVC),
FLAG(NFSD, PROC),
FLAG(NFSD, FILEOP),
FLAG(NFSD, AUTH),
FLAG(NFSD, REPCACHE),
FLAG(NFSD, XDR),
FLAG(NFSD, LOCKD),
FLAG(NFSD, ALL),
/* lockd */
FLAG(NLM, SVC),
FLAG(NLM, CLIENT),
FLAG(NLM, CLNTLOCK),
FLAG(NLM, SVCLOCK),
FLAG(NLM, MONITOR),
FLAG(NLM, CLNTSUBS),
FLAG(NLM, SVCSUBS),
FLAG(NLM, HOSTCACHE),
FLAG(NLM, XDR),
FLAG(NLM, ALL),
{ NULL, NULL, 0 }
};
static unsigned int
find_flag(char **module, char *name)
{
char *mod = *module;
unsigned int value = 0;
int i;
for (i = 0; flagmap[i].module; i++) {
if ((mod && strcasecmp(mod, flagmap[i].module))
|| strcasecmp(name, flagmap[i].name))
continue;
if (value) {
fprintf(stderr,
"%s: ambiguous symbol name %s.\n"
"This name is used by more than one module, "
"please specify the module name using\n"
"the -m option.\n",
cdename, name);
exit(1);
}
value = flagmap[i].value;
if (*module)
return value;
mod = flagmap[i].module;
}
if (!value) {
if (*module)
fprintf(stderr,
"%s: unknown module or flag %s/%s\n",
cdename, *module, name);
else
fprintf(stderr,
"%s: unknown flag %s\n",
cdename, name);
exit(1);
}
*module = mod;
return value;
}
static unsigned int
get_flags(char *module)
{
char buffer[256], filename[256];
int sysfd, len;
snprintf(filename, 256, "/proc/sys/sunrpc/%s_debug", module);
if ((sysfd = open(filename, O_RDONLY)) < 0) {
perror(filename);
exit(1);
}
if ((len = read(sysfd, buffer, sizeof(buffer))) < 0) {
perror("read");
exit(1);
}
close(sysfd);
buffer[len - 1] = '\0';
return strtoul(buffer, NULL, 0);
}
static unsigned int
set_flags(char *module, unsigned int value)
{
char buffer[64], filename[256];
int sysfd, len, ret;
snprintf(filename, 256, "/proc/sys/sunrpc/%s_debug", module);
len = sprintf(buffer, "%d", value);
if ((sysfd = open(filename, O_WRONLY)) < 0) {
perror(filename);
exit(1);
}
if ((ret = write(sysfd, buffer, len)) < 0) {
perror("write");
exit(1);
}
if (ret < len) {
fprintf(stderr, "error: short write in set_flags!\n");
exit(1);
}
close(sysfd);
return value;
}
static char *
strtolower(char *str)
{
static char temp[64];
char *sp;
strcpy(temp, str);
for (sp = temp; *sp; sp++)
*sp = tolower(*sp);
return temp;
}
static void
print_flags(FILE *ofp, char *module, unsigned int flags, int show_all)
{
char *lastmod = NULL;
unsigned int shown = 0;
int i;
if (module) {
fprintf(ofp, "%-10s", strtolower(module));
if (!flags) {
fprintf(ofp, "<no flags set>\n");
return;
}
}
for (i = 0, shown = 0; flagmap[i].module; i++) {
if (module) {
if (strcasecmp(flagmap[i].module, module))
continue;
} else if (!lastmod || strcmp(lastmod, flagmap[i].module)) {
if (lastmod) {
fprintf(ofp, "\n");
shown = 0;
}
fprintf(ofp, "%-10s", strtolower(flagmap[i].module));
lastmod = flagmap[i].module;
}
if (!(flags & flagmap[i].value)
|| (!show_all && (shown & flagmap[i].value))
|| (module && !strcasecmp(flagmap[i].name, "all")))
continue;
fprintf(ofp, " %s", strtolower(flagmap[i].name));
shown |= flagmap[i].value;
}
fprintf(ofp, "\n");
}
static void
usage(int excode, char *module)
{
if (module)
fprintf(stderr, "usage: %s [-v] [-h] [-s flags...|-c flags...]\n", cdename);
else
fprintf(stderr, "usage: %s [-v] [-h] [-m module] [-s flags...|-c flags...]\n", cdename);
fprintf(stderr, " set or cancel debug flags.\n");
if (verbose) {
fprintf(stderr, "\nModule Valid flags\n");
print_flags(stderr, module, ~(unsigned int) 0, 1);
} else {
if (module)
fprintf(stderr, " (use %s -vh to get a list of valid flags)\n", cdename);
else
fprintf(stderr, " (use %s -vh to get a list of modules and valid flags)\n", cdename);
}
exit (excode);
}
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