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freebsd-dev/usr.bin/truss/syscalls.c
Xin LI 5d2d083c92 Make use of ptrace(2) instead of procfs in truss(1), eliminating 
yet another need of an available /proc/ mount.

Tested with:	make universe
Submitted by:	howardsu
Reviewed by:	alfred
2007-04-10 04:03:34 +00:00

1100 lines
31 KiB
C
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/*
* Copryight 1997 Sean Eric Fagan
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Sean Eric Fagan
* 4. Neither the name of the author may be used to endorse or promote
* products derived from this software without specific prior written
* permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
static const char rcsid[] =
"$FreeBSD$";
#endif /* not lint */
/*
* This file has routines used to print out system calls and their
* arguments.
*/
#include <sys/mman.h>
#include <sys/types.h>
#include <sys/ptrace.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <sys/un.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/ioccom.h>
#include <machine/atomic.h>
#include <errno.h>
#include <sys/umtx.h>
#include <sys/event.h>
#include <sys/stat.h>
#include <sys/resource.h>
#include <ctype.h>
#include <err.h>
#include <fcntl.h>
#include <poll.h>
#include <signal.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include <vis.h>
#include "truss.h"
#include "extern.h"
#include "syscall.h"
/*
* This should probably be in its own file, sorted alphabetically.
*/
struct syscall syscalls[] = {
{ "fcntl", 1, 3,
{ { Int, 0 } , { Fcntl, 1 }, { Fcntlflag | OUT, 2 }}},
{ "readlink", 1, 3,
{ { Name, 0 } , { Readlinkres | OUT, 1 }, { Int, 2 }}},
{ "lseek", 2, 3,
#ifdef __LP64__
{ { Int, 0 }, {Quad, 2 }, { Whence, 3 }}},
#else
{ { Int, 0 }, {Quad, 2 }, { Whence, 4 }}},
#endif
{ "linux_lseek", 2, 3,
{ { Int, 0 }, {Int, 1 }, { Whence, 2 }}},
{ "mmap", 2, 6,
#ifdef __LP64__
{ { Ptr, 0 }, {Int, 1}, {Mprot, 2}, {Mmapflags, 3}, {Int, 4}, {Quad, 5}}},
#else
{ { Ptr, 0 }, {Int, 1}, {Mprot, 2}, {Mmapflags, 3}, {Int, 4}, {Quad, 6}}},
#endif
{ "mprotect", 1, 3,
{ { Ptr, 0 }, {Int, 1}, {Mprot, 2}}},
{ "open", 1, 3,
{ { Name | IN, 0} , { Open, 1}, {Octal, 2}}},
{ "mkdir", 1, 2,
{ { Name, 0} , {Octal, 1}}},
{ "linux_open", 1, 3,
{ { Name, 0 }, { Hex, 1}, { Octal, 2 }}},
{ "close", 1, 1,
{ { Int, 0 } } },
{ "link", 0, 2,
{ { Name, 0 }, { Name, 1 }}},
{ "unlink", 0, 1,
{ { Name, 0 }}},
{ "chdir", 0, 1,
{ { Name, 0 }}},
{ "chroot", 0, 1,
{ { Name, 0 }}},
{ "mknod", 0, 3,
{ { Name, 0 }, { Octal, 1 }, { Int, 3 }}},
{ "chmod", 0, 2,
{ { Name, 0 }, { Octal, 1 }}},
{ "chown", 0, 3,
{ { Name, 0 }, { Int, 1 }, { Int, 2 }}},
{ "mount", 0, 4,
{ { Name, 0 }, { Name, 1 }, { Int, 2 }, { Ptr, 3 }}},
{ "umount", 0, 2,
{ { Name, 0 }, { Int, 2 }}},
{ "fstat", 1, 2,
{ { Int, 0}, { Stat | OUT , 1 }}},
{ "stat", 1, 2,
{ { Name | IN, 0 }, { Stat | OUT, 1 }}},
{ "lstat", 1, 2,
{ { Name | IN, 0 }, { Stat | OUT, 1 }}},
{ "linux_newstat", 1, 2,
{ { Name | IN, 0 }, { Ptr | OUT, 1 }}},
{ "linux_newfstat", 1, 2,
{ { Int, 0 }, { Ptr | OUT, 1 }}},
{ "write", 1, 3,
{ { Int, 0 }, { BinString | IN, 1 }, { Int, 2 }}},
{ "ioctl", 1, 3,
{ { Int, 0 }, { Ioctl, 1 }, { Hex, 2 }}},
{ "break", 1, 1, { { Hex, 0 }}},
{ "exit", 0, 1, { { Hex, 0 }}},
{ "access", 1, 2, { { Name | IN, 0 }, { Int, 1 }}},
{ "sigaction", 1, 3,
{ { Signal, 0 }, { Sigaction | IN, 1 }, { Sigaction | OUT, 2 }}},
{ "accept", 1, 3,
{ { Int, 0 }, { Sockaddr | OUT, 1 }, { Ptr | OUT, 2 } } },
{ "bind", 1, 3,
{ { Int, 0 }, { Sockaddr | IN, 1 }, { Int, 2 } } },
{ "connect", 1, 3,
{ { Int, 0 }, { Sockaddr | IN, 1 }, { Int, 2 } } },
{ "getpeername", 1, 3,
{ { Int, 0 }, { Sockaddr | OUT, 1 }, { Ptr | OUT, 2 } } },
{ "getsockname", 1, 3,
{ { Int, 0 }, { Sockaddr | OUT, 1 }, { Ptr | OUT, 2 } } },
{ "recvfrom", 1, 6,
{ { Int, 0 }, { BinString | OUT, 1 }, { Int, 2 }, { Hex, 3 }, { Sockaddr | OUT, 4 }, { Ptr | OUT, 5 } } },
{ "sendto", 1, 6,
{ { Int, 0 }, { BinString | IN, 1 }, { Int, 2 }, { Hex, 3 }, { Sockaddr | IN, 4 }, { Ptr | IN, 5 } } },
{ "execve", 1, 3,
{ { Name | IN, 0 }, { StringArray | IN, 1 }, { StringArray | IN, 2 } } },
{ "linux_execve", 1, 3,
{ { Name | IN, 0 }, { StringArray | IN, 1 }, { StringArray | IN, 2 } } },
{ "kldload", 0, 1, { { Name | IN, 0 }}},
{ "kldunload", 0, 1, { { Int, 0 }}},
{ "kldfind", 0, 1, { { Name | IN, 0 }}},
{ "kldnext", 0, 1, { { Int, 0 }}},
{ "kldstat", 0, 2, { { Int, 0 }, { Ptr, 1 }}},
{ "kldfirstmod", 0, 1, { { Int, 0 }}},
{ "nanosleep", 0, 1, { { Timespec, 0 }}},
{ "select", 1, 5, { { Int, 0 }, { Fd_set, 1 }, { Fd_set, 2 }, { Fd_set, 3 }, { Timeval, 4 }}},
{ "poll", 1, 3, { { Pollfd, 0 }, { Int, 1 }, { Int, 2 }}},
{ "gettimeofday", 1, 2, { { Timeval | OUT, 0 }, { Ptr, 1 }}},
{ "clock_gettime", 1, 2, { { Int, 0 }, { Timespec | OUT, 1 }}},
{ "getitimer", 1, 2, { { Int, 0 }, { Itimerval | OUT, 2 }}},
{ "setitimer", 1, 3, { { Int, 0 }, { Itimerval, 1} , { Itimerval | OUT, 2 }}},
{ "kse_release", 0, 1, { { Timespec, 0 }}},
{ "kevent", 0, 6, { { Int, 0 }, { Kevent, 1 }, { Int, 2 }, { Kevent | OUT, 3 }, { Int, 4 }, { Timespec, 5 }}},
{ "_umtx_lock", 0, 1, { { Umtx, 0 }}},
{ "_umtx_unlock", 0, 1, { { Umtx, 0 }}},
{ "sigprocmask", 0, 3, { { Sigprocmask, 0 }, { Sigset, 1 }, { Sigset | OUT, 2 }}},
{ "unmount", 1, 2, { { Name, 0 }, { Int, 1 }}},
{ "socket", 1, 3, { { Sockdomain, 0}, { Socktype, 1}, {Int, 2 }}},
{ "getrusage", 1, 2, { { Int, 0 }, { Rusage | OUT, 1 }}},
{ "__getcwd", 1, 2, { { Name | OUT, 0}, { Int, 1 }}},
{ "shutdown", 1, 2, { { Int, 0}, { Shutdown, 1}}},
{ "getrlimit", 1, 2, { { Resource, 0}, {Rlimit | OUT, 1}}},
{ "setrlimit", 1, 2, { { Resource, 0}, {Rlimit | IN, 1}}},
{ "utimes", 1, 2,
{ { Name | IN, 0 }, { Timeval2 | IN, 1 }}},
{ "lutimes", 1, 2,
{ { Name | IN, 0 }, { Timeval2 | IN, 1 }}},
{ "futimes", 1, 2,
{ { Int, 0 }, { Timeval | IN, 1 }}},
{ "chflags", 1, 2,
{ { Name | IN, 0 }, { Hex, 1 }}},
{ "lchflags", 1, 2,
{ { Name | IN, 0 }, { Hex, 1 }}},
{ "pathconf", 1, 2,
{ { Name | IN, 0 }, { Pathconf, 1 }}},
{ "truncate", 1, 3,
{ { Name | IN, 0 }, { Int | IN, 1 }, { Quad | IN, 2 }}},
{ "ftruncate", 1, 3,
{ { Int | IN, 0 }, { Int | IN, 1 }, { Quad | IN, 2 }}},
{ "kill", 1, 2,
{ { Int | IN, 0 }, { Signal | IN, 1}}},
{ "munmap", 1, 2,
{ { Ptr, 0 }, { Int, 1 }}},
{ "read", 1, 3,
{ { Int, 0}, { BinString | OUT, 1}, { Int, 2}}},
{ "rename", 1, 2,
{ { Name , 0} , { Name, 1}}},
{ "symlink", 1, 2,
{ { Name , 0} , { Name, 1}}},
{ 0, 0, 0, { { 0, 0 }}},
};
/* Xlat idea taken from strace */
struct xlat {
int val;
const char *str;
};
#define X(a) { a, #a },
#define XEND { 0, NULL }
static struct xlat kevent_filters[] = {
X(EVFILT_READ) X(EVFILT_WRITE) X(EVFILT_AIO) X(EVFILT_VNODE)
X(EVFILT_PROC) X(EVFILT_SIGNAL) X(EVFILT_TIMER)
X(EVFILT_NETDEV) X(EVFILT_FS) X(EVFILT_READ) XEND
};
static struct xlat kevent_flags[] = {
X(EV_ADD) X(EV_DELETE) X(EV_ENABLE) X(EV_DISABLE) X(EV_ONESHOT)
X(EV_CLEAR) X(EV_FLAG1) X(EV_ERROR) X(EV_EOF) XEND
};
struct xlat poll_flags[] = {
X(POLLSTANDARD) X(POLLIN) X(POLLPRI) X(POLLOUT) X(POLLERR)
X(POLLHUP) X(POLLNVAL) X(POLLRDNORM) X(POLLRDBAND)
X(POLLWRBAND) X(POLLINIGNEOF) XEND
};
static struct xlat mmap_flags[] = {
X(MAP_SHARED) X(MAP_PRIVATE) X(MAP_FIXED) X(MAP_RENAME)
X(MAP_NORESERVE) X(MAP_RESERVED0080) X(MAP_RESERVED0100)
X(MAP_HASSEMAPHORE) X(MAP_STACK) X(MAP_NOSYNC) X(MAP_ANON)
X(MAP_NOCORE) XEND
};
static struct xlat mprot_flags[] = {
X(PROT_NONE) X(PROT_READ) X(PROT_WRITE) X(PROT_EXEC) XEND
};
static struct xlat whence_arg[] = {
X(SEEK_SET) X(SEEK_CUR) X(SEEK_END) XEND
};
static struct xlat sigaction_flags[] = {
X(SA_ONSTACK) X(SA_RESTART) X(SA_RESETHAND) X(SA_NOCLDSTOP)
X(SA_NODEFER) X(SA_NOCLDWAIT) X(SA_SIGINFO) XEND
};
static struct xlat fcntl_arg[] = {
X(F_DUPFD) X(F_GETFD) X(F_SETFD) X(F_GETFL) X(F_SETFL)
X(F_GETOWN) X(F_SETOWN) X(F_GETLK) X(F_SETLK) X(F_SETLKW) XEND
};
static struct xlat fcntlfd_arg[] = {
X(FD_CLOEXEC) XEND
};
static struct xlat fcntlfl_arg[] = {
X(O_APPEND) X(O_ASYNC) X(O_FSYNC) X(O_NONBLOCK) X(O_NOFOLLOW)
X(O_DIRECT) XEND
};
static struct xlat sockdomain_arg[] = {
X(PF_UNSPEC) X(PF_LOCAL) X(PF_UNIX) X(PF_INET) X(PF_IMPLINK)
X(PF_PUP) X(PF_CHAOS) X(PF_NETBIOS) X(PF_ISO) X(PF_OSI)
X(PF_ECMA) X(PF_DATAKIT) X(PF_CCITT) X(PF_SNA) X(PF_DECnet)
X(PF_DLI) X(PF_LAT) X(PF_HYLINK) X(PF_APPLETALK) X(PF_ROUTE)
X(PF_LINK) X(PF_XTP) X(PF_COIP) X(PF_CNT) X(PF_SIP) X(PF_IPX)
X(PF_RTIP) X(PF_PIP) X(PF_ISDN) X(PF_KEY) X(PF_INET6)
X(PF_NATM) X(PF_ATM) X(PF_NETGRAPH) X(PF_SLOW) X(PF_SCLUSTER)
X(PF_ARP) X(PF_BLUETOOTH) XEND
};
static struct xlat socktype_arg[] = {
X(SOCK_STREAM) X(SOCK_DGRAM) X(SOCK_RAW) X(SOCK_RDM)
X(SOCK_SEQPACKET) XEND
};
static struct xlat open_flags[] = {
X(O_RDONLY) X(O_WRONLY) X(O_RDWR) X(O_ACCMODE) X(O_NONBLOCK)
X(O_APPEND) X(O_SHLOCK) X(O_EXLOCK) X(O_ASYNC) X(O_FSYNC)
X(O_NOFOLLOW) X(O_CREAT) X(O_TRUNC) X(O_EXCL) X(O_NOCTTY)
X(O_DIRECT) XEND
};
static struct xlat shutdown_arg[] = {
X(SHUT_RD) X(SHUT_WR) X(SHUT_RDWR) XEND
};
static struct xlat resource_arg[] = {
X(RLIMIT_CPU) X(RLIMIT_FSIZE) X(RLIMIT_DATA) X(RLIMIT_STACK)
X(RLIMIT_CORE) X(RLIMIT_RSS) X(RLIMIT_MEMLOCK) X(RLIMIT_NPROC)
X(RLIMIT_NOFILE) X(RLIMIT_SBSIZE) X(RLIMIT_VMEM) XEND
};
static struct xlat pathconf_arg[] = {
X(_PC_LINK_MAX) X(_PC_MAX_CANON) X(_PC_MAX_INPUT)
X(_PC_NAME_MAX) X(_PC_PATH_MAX) X(_PC_PIPE_BUF)
X(_PC_CHOWN_RESTRICTED) X(_PC_NO_TRUNC) X(_PC_VDISABLE)
X(_PC_ASYNC_IO) X(_PC_PRIO_IO) X(_PC_SYNC_IO)
X(_PC_ALLOC_SIZE_MIN) X(_PC_FILESIZEBITS)
X(_PC_REC_INCR_XFER_SIZE) X(_PC_REC_MAX_XFER_SIZE)
X(_PC_REC_MIN_XFER_SIZE) X(_PC_REC_XFER_ALIGN)
X(_PC_SYMLINK_MAX) X(_PC_ACL_EXTENDED) X(_PC_ACL_PATH_MAX)
X(_PC_CAP_PRESENT) X(_PC_INF_PRESENT) X(_PC_MAC_PRESENT)
XEND
};
#undef X
#undef XEND
/* Searches an xlat array for a value, and returns it if found. Otherwise
return a string representation. */
static const char
*lookup(struct xlat *xlat, int val, int base)
{
static char tmp[16];
for (; xlat->str != NULL; xlat++)
if (xlat->val == val)
return xlat->str;
switch (base) {
case 8:
sprintf(tmp, "0%o", val);
break;
case 16:
sprintf(tmp, "0x%x", val);
break;
case 10:
sprintf(tmp, "%u", val);
break;
default:
errx(1,"Unknown lookup base");
break;
}
return tmp;
}
static const char *
xlookup(struct xlat *xlat, int val)
{
return lookup(xlat, val, 16);
}
/* Searches an xlat array containing bitfield values. Remaining bits
set after removing the known ones are printed at the end:
IN|0x400 */
static char
*xlookup_bits(struct xlat *xlat, int val)
{
static char str[512];
int len = 0;
int rem = val;
for (; xlat->str != NULL; xlat++)
{
if ((xlat->val & rem) == xlat->val)
{
/* don't print the "all-bits-zero" string unless all
bits are really zero */
if (xlat->val == 0 && val != 0)
continue;
len += sprintf(str + len, "%s|", xlat->str);
rem &= ~(xlat->val);
}
}
/* if we have leftover bits or didn't match anything */
if (rem || len == 0)
len += sprintf(str + len, "0x%x", rem);
if (len && str[len - 1] == '|')
len--;
str[len] = 0;
return str;
}
/*
* If/when the list gets big, it might be desirable to do it
* as a hash table or binary search.
*/
struct syscall *
get_syscall(const char *name) {
struct syscall *sc = syscalls;
if (name == NULL)
return (NULL);
while (sc->name) {
if (!strcmp(name, sc->name))
return sc;
sc++;
}
return NULL;
}
/*
* get_struct
*
* Copy a fixed amount of bytes from the process.
*/
static int
get_struct(int pid, void *offset, void *buf, int len) {
struct ptrace_io_desc iorequest;
iorequest.piod_op = PIOD_READ_D;
iorequest.piod_offs = offset;
iorequest.piod_addr = buf;
iorequest.piod_len = len;
if (ptrace(PT_IO, pid, (caddr_t)&iorequest, 0) < 0)
return -1;
return 0;
}
#define MAXSIZE 4096
#define BLOCKSIZE 1024
/*
* get_string
* Copy a string from the process. Note that it is
* expected to be a C string, but if max is set, it will
* only get that much.
*/
static char *
get_string(pid_t pid, void *offset, int max) {
char *buf;
struct ptrace_io_desc iorequest;
int totalsize, size;
int diff = 0;
int i;
totalsize = size = max ? (max + 1) : BLOCKSIZE;
buf = malloc(totalsize);
if (buf == NULL)
return NULL;
for(;;) {
diff = totalsize - size;
iorequest.piod_op = PIOD_READ_D;
iorequest.piod_offs = (char *)offset + diff;
iorequest.piod_addr = buf + diff;
iorequest.piod_len = size;
if (ptrace(PT_IO, pid, (caddr_t)&iorequest, 0) < 0) {
free(buf);
return NULL;
}
for (i = 0 ; i < size; i++) {
if (buf[diff + i] == '\0')
return (buf);
}
if (totalsize < MAXSIZE - BLOCKSIZE && max == 0) {
totalsize += BLOCKSIZE;
buf = realloc(buf, totalsize);
size = BLOCKSIZE;
}
else {
buf[totalsize] = '\0';
return buf;
}
}
}
/*
* print_arg
* Converts a syscall argument into a string. Said string is
* allocated via malloc(), so needs to be free()'d. The file
* descriptor is for the process' memory (via /proc), and is used
* to get any data (where the argument is a pointer). sc is
* a pointer to the syscall description (see above); args is
* an array of all of the system call arguments.
*/
char *
print_arg(struct syscall_args *sc, unsigned long *args, long retval, struct trussinfo *trussinfo) {
char *tmp = NULL;
int pid = trussinfo->pid;
switch (sc->type & ARG_MASK) {
case Hex:
asprintf(&tmp, "0x%lx", args[sc->offset]);
break;
case Octal:
asprintf(&tmp, "0%lo", args[sc->offset]);
break;
case Int:
asprintf(&tmp, "%ld", args[sc->offset]);
break;
case Name:
{
/* NULL-terminated string. */
char *tmp2;
tmp2 = get_string(pid, (void*)args[sc->offset], 0);
asprintf(&tmp, "\"%s\"", tmp2);
free(tmp2);
}
break;
case BinString:
{
/* Binary block of data that might have printable characters.
XXX If type|OUT, assume that the length is the syscall's
return value. Otherwise, assume that the length of the block
is in the next syscall argument. */
int max_string = trussinfo->strsize;
char tmp2[max_string+1], *tmp3;
int len;
int truncated = 0;
if (sc->type & OUT)
len = retval;
else
len = args[sc->offset + 1];
/* Don't print more than max_string characters, to avoid word
wrap. If we have to truncate put some ... after the string.
*/
if (len > max_string) {
len = max_string;
truncated = 1;
}
if (len && get_struct(pid, (void*)args[sc->offset], &tmp2, len) != -1) {
tmp3 = malloc(len * 4 + 1);
while (len) {
if (strvisx(tmp3, tmp2, len, VIS_CSTYLE|VIS_TAB|VIS_NL) <= max_string)
break;
len--;
truncated = 1;
};
asprintf(&tmp, "\"%s\"%s", tmp3, truncated?"...":"");
free(tmp3);
} else
asprintf(&tmp, "0x%lx", args[sc->offset]);
}
break;
case StringArray:
{
int num, size, i;
char *tmp2;
char *string;
char *strarray[100]; /* XXX This is ugly. */
if (get_struct(pid, (void *)args[sc->offset], (void *)&strarray,
sizeof(strarray)) == -1) {
err(1, "get_struct %p", (void *)args[sc->offset]);
}
num = 0;
size = 0;
/* Find out how large of a buffer we'll need. */
while (strarray[num] != NULL) {
string = get_string(pid, (void*)strarray[num], 0);
size += strlen(string);
free(string);
num++;
}
size += 4 + (num * 4);
tmp = (char *)malloc(size);
tmp2 = tmp;
tmp2 += sprintf(tmp2, " [");
for (i = 0; i < num; i++) {
string = get_string(pid, (void*)strarray[i], 0);
tmp2 += sprintf(tmp2, " \"%s\"%c", string, (i+1 == num) ? ' ' : ',');
free(string);
}
tmp2 += sprintf(tmp2, "]");
}
break;
#ifdef __LP64__
case Quad:
asprintf(&tmp, "0x%lx", args[sc->offset]);
break;
#else
case Quad:
{
unsigned long long ll;
ll = *(unsigned long long *)(args + sc->offset);
asprintf(&tmp, "0x%llx", ll);
break;
}
#endif
case Ptr:
asprintf(&tmp, "0x%lx", args[sc->offset]);
break;
case Readlinkres:
{
char *tmp2;
if (retval == -1) {
tmp = strdup("");
break;
}
tmp2 = get_string(pid, (void*)args[sc->offset], retval);
asprintf(&tmp, "\"%s\"", tmp2);
free(tmp2);
}
break;
case Ioctl:
{
const char *temp = ioctlname(args[sc->offset]);
if (temp)
tmp = strdup(temp);
else
{
unsigned long arg = args[sc->offset];
asprintf(&tmp, "0x%lx { IO%s%s 0x%lx('%c'), %lu, %lu}", arg,
arg&IOC_OUT?"R":"", arg&IOC_IN?"W":"",
IOCGROUP(arg), isprint(IOCGROUP(arg))?(char)IOCGROUP(arg):'?',
arg & 0xFF, IOCPARM_LEN(arg));
}
}
break;
case Umtx:
{
struct umtx umtx;
if (get_struct(pid, (void *)args[sc->offset], &umtx, sizeof(umtx)) != -1)
asprintf(&tmp, "{0x%lx}", (long)umtx.u_owner);
else
asprintf(&tmp, "0x%lx", args[sc->offset]);
}
break;
case Timespec:
{
struct timespec ts;
if (get_struct(pid, (void *)args[sc->offset], &ts, sizeof(ts)) != -1)
asprintf(&tmp, "{%ld.%09ld}", (long)ts.tv_sec, ts.tv_nsec);
else
asprintf(&tmp, "0x%lx", args[sc->offset]);
}
break;
case Timeval:
{
struct timeval tv;
if (get_struct(pid, (void *)args[sc->offset], &tv, sizeof(tv)) != -1)
asprintf(&tmp, "{%ld.%06ld}", (long)tv.tv_sec, tv.tv_usec);
else
asprintf(&tmp, "0x%lx", args[sc->offset]);
}
break;
case Timeval2:
{
struct timeval tv[2];
if (get_struct(pid, (void *)args[sc->offset], &tv, sizeof(tv)) != -1)
asprintf(&tmp, "{%ld.%06ld, %ld.%06ld}",
(long)tv[0].tv_sec, tv[0].tv_usec,
(long)tv[1].tv_sec, tv[1].tv_usec);
else
asprintf(&tmp, "0x%lx", args[sc->offset]);
}
break;
case Itimerval:
{
struct itimerval itv;
if (get_struct(pid, (void *)args[sc->offset], &itv, sizeof(itv)) != -1)
asprintf(&tmp, "{%ld.%06ld, %ld.%06ld}",
(long)itv.it_interval.tv_sec,
itv.it_interval.tv_usec,
(long)itv.it_value.tv_sec,
itv.it_value.tv_usec);
else
asprintf(&tmp, "0x%lx", args[sc->offset]);
}
break;
case Pollfd:
{
/*
* XXX: A Pollfd argument expects the /next/ syscall argument to be
* the number of fds in the array. This matches the poll syscall.
*/
struct pollfd *pfd;
int numfds = args[sc->offset+1];
int bytes = sizeof(struct pollfd) * numfds;
int i, tmpsize, u, used;
const int per_fd = 100;
if ((pfd = malloc(bytes)) == NULL)
err(1, "Cannot malloc %d bytes for pollfd array", bytes);
if (get_struct(pid, (void *)args[sc->offset], pfd, bytes) != -1) {
used = 0;
tmpsize = 1 + per_fd * numfds + 2;
if ((tmp = malloc(tmpsize)) == NULL)
err(1, "Cannot alloc %d bytes for poll output", tmpsize);
tmp[used++] = '{';
for (i = 0; i < numfds; i++) {
u = snprintf(tmp + used, per_fd,
"%s%d/%s",
i > 0 ? " " : "",
pfd[i].fd,
xlookup_bits(poll_flags, pfd[i].events) );
if (u > 0)
used += u < per_fd ? u : per_fd;
}
tmp[used++] = '}';
tmp[used++] = '\0';
} else
asprintf(&tmp, "0x%lx", args[sc->offset]);
free(pfd);
}
break;
case Fd_set:
{
/*
* XXX: A Fd_set argument expects the /first/ syscall argument to be
* the number of fds in the array. This matches the select syscall.
*/
fd_set *fds;
int numfds = args[0];
int bytes = _howmany(numfds, _NFDBITS) * _NFDBITS;
int i, tmpsize, u, used;
const int per_fd = 20;
if ((fds = malloc(bytes)) == NULL)
err(1, "Cannot malloc %d bytes for fd_set array", bytes);
if (get_struct(pid, (void *)args[sc->offset], fds, bytes) != -1) {
used = 0;
tmpsize = 1 + numfds * per_fd + 2;
if ((tmp = malloc(tmpsize)) == NULL)
err(1, "Cannot alloc %d bytes for fd_set output", tmpsize);
tmp[used++] = '{';
for (i = 0; i < numfds; i++) {
if (FD_ISSET(i, fds)) {
u = snprintf(tmp + used, per_fd, "%d ", i);
if (u > 0)
used += u < per_fd ? u : per_fd;
}
}
if (tmp[used-1] == ' ')
used--;
tmp[used++] = '}';
tmp[used++] = '\0';
} else
asprintf(&tmp, "0x%lx", args[sc->offset]);
free(fds);
}
break;
case Signal:
{
long sig;
sig = args[sc->offset];
tmp = strsig(sig);
if (tmp == NULL)
asprintf(&tmp, "%ld", sig);
}
break;
case Sigset:
{
long sig;
sigset_t ss;
int i, used;
sig = args[sc->offset];
if (get_struct(pid, (void *)args[sc->offset], (void *)&ss,
sizeof(ss)) == -1)
{
asprintf(&tmp, "0x%lx", args[sc->offset]);
break;
}
tmp = malloc(sys_nsig * 8); /* 7 bytes avg per signal name */
used = 0;
for (i = 1; i < sys_nsig; i++)
{
if (sigismember(&ss, i))
{
used += sprintf(tmp + used, "%s|", strsig(i));
}
}
if(used)
tmp[used-1] = 0;
else
strcpy(tmp, "0x0");
}
break;
case Sigprocmask:
{
switch (args[sc->offset]) {
#define S(a) case a: tmp = strdup(#a); break;
S(SIG_BLOCK);
S(SIG_UNBLOCK);
S(SIG_SETMASK);
#undef S
}
if (tmp == NULL)
asprintf(&tmp, "0x%lx", args[sc->offset]);
}
break;
case Fcntlflag:
{
/* XXX output depends on the value of the previous argument */
switch (args[sc->offset-1]) {
case F_SETFD:
tmp = strdup(xlookup_bits(fcntlfd_arg, args[sc->offset]));
break;
case F_SETFL:
tmp = strdup(xlookup_bits(fcntlfl_arg, args[sc->offset]));
break;
case F_GETFD:
case F_GETFL:
case F_GETOWN:
tmp = strdup("");
break;
default:
asprintf(&tmp, "0x%lx", args[sc->offset]);
break;
}
}
break;
case Open:
tmp = strdup(xlookup_bits(open_flags, args[sc->offset]));
break;
case Fcntl:
tmp = strdup(xlookup(fcntl_arg, args[sc->offset]));
break;
case Mprot:
tmp = strdup(xlookup_bits(mprot_flags, args[sc->offset]));
break;
case Mmapflags:
tmp = strdup(xlookup_bits(mmap_flags, args[sc->offset]));
break;
case Whence:
tmp = strdup(xlookup(whence_arg, args[sc->offset]));
break;
case Sockdomain:
tmp = strdup(xlookup(sockdomain_arg, args[sc->offset]));
break;
case Socktype:
tmp = strdup(xlookup(socktype_arg, args[sc->offset]));
break;
case Shutdown:
tmp = strdup(xlookup(shutdown_arg, args[sc->offset]));
break;
case Resource:
tmp = strdup(xlookup(resource_arg, args[sc->offset]));
break;
case Pathconf:
tmp = strdup(xlookup(pathconf_arg, args[sc->offset]));
break;
case Sockaddr:
{
struct sockaddr_storage ss;
char addr[64];
struct sockaddr_in *lsin;
struct sockaddr_in6 *lsin6;
struct sockaddr_un *sun;
struct sockaddr *sa;
char *p;
u_char *q;
int i;
if (args[sc->offset] == 0) {
asprintf(&tmp, "NULL");
break;
}
/* yuck: get ss_len */
if (get_struct(pid, (void *)args[sc->offset], (void *)&ss,
sizeof(ss.ss_len) + sizeof(ss.ss_family)) == -1)
err(1, "get_struct %p", (void *)args[sc->offset]);
/*
* If ss_len is 0, then try to guess from the sockaddr type.
* AF_UNIX may be initialized incorrectly, so always frob
* it by using the "right" size.
*/
if (ss.ss_len == 0 || ss.ss_family == AF_UNIX) {
switch (ss.ss_family) {
case AF_INET:
ss.ss_len = sizeof(*lsin);
break;
case AF_UNIX:
ss.ss_len = sizeof(*sun);
break;
default:
/* hurrrr */
break;
}
}
if (get_struct(pid, (void *)args[sc->offset], (void *)&ss, ss.ss_len)
== -1) {
err(2, "get_struct %p", (void *)args[sc->offset]);
}
switch (ss.ss_family) {
case AF_INET:
lsin = (struct sockaddr_in *)&ss;
inet_ntop(AF_INET, &lsin->sin_addr, addr, sizeof addr);
asprintf(&tmp, "{ AF_INET %s:%d }", addr, htons(lsin->sin_port));
break;
case AF_INET6:
lsin6 = (struct sockaddr_in6 *)&ss;
inet_ntop(AF_INET6, &lsin6->sin6_addr, addr, sizeof addr);
asprintf(&tmp, "{ AF_INET6 [%s]:%d }", addr, htons(lsin6->sin6_port));
break;
case AF_UNIX:
sun = (struct sockaddr_un *)&ss;
asprintf(&tmp, "{ AF_UNIX \"%s\" }", sun->sun_path);
break;
default:
sa = (struct sockaddr *)&ss;
asprintf(&tmp, "{ sa_len = %d, sa_family = %d, sa_data = {%n%*s } }",
(int)sa->sa_len, (int)sa->sa_family, &i,
6 * (int)(sa->sa_len - ((char *)&sa->sa_data - (char *)sa)), "");
if (tmp != NULL) {
p = tmp + i;
for (q = (u_char *)&sa->sa_data; q < (u_char *)sa + sa->sa_len; q++)
p += sprintf(p, " %#02x,", *q);
}
}
}
break;
case Sigaction:
{
struct sigaction sa;
char *hand;
const char *h;
if (get_struct(pid, (void *)args[sc->offset], &sa, sizeof(sa)) != -1) {
asprintf(&hand, "%p", sa.sa_handler);
if (sa.sa_handler == SIG_DFL)
h = "SIG_DFL";
else if (sa.sa_handler == SIG_IGN)
h = "SIG_IGN";
else
h = hand;
asprintf(&tmp, "{ %s %s ss_t }",
h,
xlookup_bits(sigaction_flags, sa.sa_flags));
free(hand);
} else
asprintf(&tmp, "0x%lx", args[sc->offset]);
}
break;
case Kevent:
{
/*
* XXX XXX: the size of the array is determined by either the
* next syscall argument, or by the syscall returnvalue,
* depending on which argument number we are. This matches the
* kevent syscall, but luckily that's the only syscall that uses
* them.
*/
struct kevent *ke;
int numevents = -1;
int bytes = 0;
int i, tmpsize, u, used;
const int per_ke = 100;
if (sc->offset == 1)
numevents = args[sc->offset+1];
else if (sc->offset == 3 && retval != -1)
numevents = retval;
if (numevents >= 0)
bytes = sizeof(struct kevent) * numevents;
if ((ke = malloc(bytes)) == NULL)
err(1, "Cannot malloc %d bytes for kevent array", bytes);
if (numevents >= 0 && get_struct(pid, (void *)args[sc->offset], ke, bytes) != -1) {
used = 0;
tmpsize = 1 + per_ke * numevents + 2;
if ((tmp = malloc(tmpsize)) == NULL)
err(1, "Cannot alloc %d bytes for kevent output", tmpsize);
tmp[used++] = '{';
for (i = 0; i < numevents; i++) {
u = snprintf(tmp + used, per_ke,
"%s%p,%s,%s,%d,%p,%p",
i > 0 ? " " : "",
(void *)ke[i].ident,
xlookup(kevent_filters, ke[i].filter),
xlookup_bits(kevent_flags, ke[i].flags),
ke[i].fflags,
(void *)ke[i].data,
(void *)ke[i].udata);
if (u > 0)
used += u < per_ke ? u : per_ke;
}
tmp[used++] = '}';
tmp[used++] = '\0';
} else
asprintf(&tmp, "0x%lx", args[sc->offset]);
free(ke);
}
break;
case Stat:
{
struct stat st;
if (get_struct(pid, (void *)args[sc->offset], &st, sizeof(st)) != -1) {
char mode[12];
strmode(st.st_mode, mode);
asprintf(&tmp, "{mode=%s,inode=%jd,size=%jd,blksize=%ld}",
mode,
(intmax_t)st.st_ino,(intmax_t)st.st_size,(long)st.st_blksize);
} else
asprintf(&tmp, "0x%lx", args[sc->offset]);
}
break;
case Rusage:
{
struct rusage ru;
if (get_struct(pid, (void *)args[sc->offset], &ru, sizeof(ru)) != -1)
asprintf(&tmp, "{u=%ld.%06ld,s=%ld.%06ld,in=%ld,out=%ld}",
(long)ru.ru_utime.tv_sec, ru.ru_utime.tv_usec,
(long)ru.ru_stime.tv_sec, ru.ru_stime.tv_usec,
ru.ru_inblock, ru.ru_oublock);
else
asprintf(&tmp, "0x%lx", args[sc->offset]);
}
break;
case Rlimit:
{
struct rlimit rl;
if (get_struct(pid, (void *)args[sc->offset], &rl, sizeof(rl)) != -1)
asprintf(&tmp, "{cur=%ju,max=%ju}",
rl.rlim_cur, rl.rlim_max);
else
asprintf(&tmp, "0x%lx", args[sc->offset]);
}
break;
default:
errx(1, "Invalid argument type %d\n", sc->type & ARG_MASK);
}
return tmp;
}
/*
* print_syscall
* Print (to outfile) the system call and its arguments. Note that
* nargs is the number of arguments (not the number of words; this is
* potentially confusing, I know).
*/
void
print_syscall(struct trussinfo *trussinfo, const char *name, int nargs, char **s_args) {
int i;
int len = 0;
struct timespec timediff;
if (trussinfo->flags & FOLLOWFORKS)
len += fprintf(trussinfo->outfile, "%5d: ", trussinfo->pid);
if (name != NULL && (!strcmp(name, "execve") || !strcmp(name, "exit"))) {
clock_gettime(CLOCK_REALTIME, &trussinfo->after);
}
if (trussinfo->flags & ABSOLUTETIMESTAMPS) {
timespecsubt(&trussinfo->after, &trussinfo->start_time, &timediff);
len += fprintf(trussinfo->outfile, "%ld.%09ld ",
(long)timediff.tv_sec, timediff.tv_nsec);
}
if (trussinfo->flags & RELATIVETIMESTAMPS) {
timespecsubt(&trussinfo->after, &trussinfo->before, &timediff);
len += fprintf(trussinfo->outfile, "%ld.%09ld ",
(long)timediff.tv_sec, timediff.tv_nsec);
}
len += fprintf(trussinfo->outfile, "%s(", name);
for (i = 0; i < nargs; i++) {
if (s_args[i])
len += fprintf(trussinfo->outfile, "%s", s_args[i]);
else
len += fprintf(trussinfo->outfile, "<missing argument>");
len += fprintf(trussinfo->outfile, "%s", i < (nargs - 1) ? "," : "");
}
len += fprintf(trussinfo->outfile, ")");
for (i = 0; i < 6 - (len / 8); i++)
fprintf(trussinfo->outfile, "\t");
}
void
print_syscall_ret(struct trussinfo *trussinfo, const char *name, int nargs,
char **s_args, int errorp, long retval)
{
print_syscall(trussinfo, name, nargs, s_args);
fflush(trussinfo->outfile);
if (errorp) {
fprintf(trussinfo->outfile, " ERR#%ld '%s'\n", retval, strerror(retval));
} else {
fprintf(trussinfo->outfile, " = %ld (0x%lx)\n", retval, retval);
}
}
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