freebsd-dev/usr.bin/truss/syscalls.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[] =
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"$FreeBSD$";
#endif /* not lint */
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/*
* This file has routines used to print out system calls and their
* arguments.
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <ctype.h>
#include <err.h>
#include <signal.h>
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "extern.h"
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#include "syscall.h"
/*
* This should probably be in its own file.
*/
struct syscall syscalls[] = {
{ "readlink", 1, 3,
{ { String, 0 } , { String | OUT, 1 }, { Int, 2 }}},
{ "lseek", 2, 3,
{ { Int, 0 }, {Quad, 2 }, { Int, 4 }}},
{ "mmap", 2, 6,
{ { Hex, 0 }, {Int, 1}, {Hex, 2}, {Hex, 3}, {Int, 4}, {Quad, 6}}},
{ "open", 1, 3,
{ { String | IN, 0} , { Hex, 1}, {Octal, 2}}},
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{ "linux_open", 1, 3,
{ { String, 0 }, { Hex, 1}, { Octal, 2 }}},
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{ "close", 1, 1, { { Int, 0 } } },
{ "fstat", 1, 2,
{ { Int, 0}, {Ptr | OUT , 1 }}},
{ "stat", 1, 2,
{ { String | IN, 0 }, { Ptr | OUT, 1 }}},
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{ "lstat", 1, 2,
{ { String | IN, 0 }, { Ptr | OUT, 1 }}},
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{ "linux_newstat", 1, 2,
{ { String | IN, 0 }, { Ptr | OUT, 1 }}},
{ "linux_newfstat", 1, 2,
{ { Int, 0 }, { Ptr | OUT, 1 }}},
{ "write", 1, 3,
{ { Int, 0}, { Ptr | IN, 1 }, { Int, 2 }}},
{ "ioctl", 1, 3,
{ { Int, 0}, { Ioctl, 1 }, { Hex, 2 }}},
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{ "break", 1, 1, { { Hex, 0 }}},
{ "exit", 0, 1, { { Hex, 0 }}},
{ "access", 1, 2, { { String | IN, 0 }, { Int, 1 }}},
{ "sigaction", 1, 3,
{ { Signal, 0 }, { Ptr | IN, 1 }, { Ptr | OUT, 2 }}},
{ "accept", 1, 3,
{ { Hex, 0 }, { Sockaddr | OUT, 1 }, { Ptr | OUT, 2 } } },
{ "bind", 1, 3,
{ { Hex, 0 }, { Sockaddr | IN, 1 }, { Int, 2 } } },
{ "connect", 1, 3,
{ { Hex, 0 }, { Sockaddr | IN, 1 }, { Int, 2 } } },
{ "getpeername", 1, 3,
{ { Hex, 0 }, { Sockaddr | OUT, 1 }, { Ptr | OUT, 2 } } },
{ "getsockname", 1, 3,
{ { Hex, 0 }, { Sockaddr | OUT, 1 }, { Ptr | OUT, 2 } } },
{ 0, 0, 0, { { 0, 0 }}},
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};
/*
* 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;
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 procfd, void *offset, void *buf, int len) {
char *pos;
FILE *p;
int c, fd;
if ((fd = dup(procfd)) == -1)
err(1, "dup");
if ((p = fdopen(fd, "r")) == NULL)
err(1, "fdopen");
fseek(p, (long)offset, SEEK_SET);
for (pos = (char *)buf; len--; pos++) {
if ((c = fgetc(p)) == EOF)
return -1;
*pos = c;
}
fclose(p);
return 0;
}
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/*
* 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.
*/
char *
get_string(int procfd, void *offset, int max) {
char *buf;
int size, len, c, fd;
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FILE *p;
if ((fd = dup(procfd)) == -1)
err(1, "dup");
if ((p = fdopen(fd, "r")) == NULL)
err(1, "fdopen");
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buf = malloc( size = (max ? max : 64 ) );
len = 0;
buf[0] = 0;
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fseek(p, (long)offset, SEEK_SET);
while ((c = fgetc(p)) != EOF) {
buf[len++] = c;
if (c == 0 || len == max) {
buf[len] = 0;
break;
}
if (len == size) {
char *tmp;
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tmp = realloc(buf, size+64);
if (tmp == NULL) {
buf[len] = 0;
fclose(p);
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return buf;
}
size += 64;
buf = tmp;
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}
}
fclose(p);
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return buf;
}
/*
* Gag. This is really unportable. Multiplication is more portable.
* But slower, from the code I saw.
*/
static long long
make_quad(unsigned long p1, unsigned long p2) {
union {
long long ll;
unsigned long l[2];
} t;
t.l[0] = p1;
t.l[1] = p2;
return t.ll;
}
/*
* 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(int fd, struct syscall_args *sc, unsigned long *args) {
char *tmp = NULL;
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switch (sc->type & ARG_MASK) {
case Hex:
tmp = malloc(12);
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sprintf(tmp, "0x%lx", args[sc->offset]);
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break;
case Octal:
tmp = malloc(13);
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sprintf(tmp, "0%lo", args[sc->offset]);
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break;
case Int:
tmp = malloc(12);
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sprintf(tmp, "%ld", args[sc->offset]);
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break;
case String:
{
char *tmp2;
tmp2 = get_string(fd, (void*)args[sc->offset], 0);
tmp = malloc(strlen(tmp2) + 3);
sprintf(tmp, "\"%s\"", tmp2);
free(tmp2);
}
break;
case Quad:
{
unsigned long long t;
unsigned long l1, l2;
l1 = args[sc->offset];
l2 = args[sc->offset+1];
t = make_quad(l1, l2);
tmp = malloc(24);
sprintf(tmp, "0x%qx", t);
break;
}
case Ptr:
tmp = malloc(12);
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sprintf(tmp, "0x%lx", args[sc->offset]);
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break;
case Ioctl:
{
const char *temp = ioctlname(args[sc->offset]);
if (temp)
tmp = strdup(temp);
else {
tmp = malloc(12);
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sprintf(tmp, "0x%lx", args[sc->offset]);
}
}
break;
case Signal:
{
long sig;
sig = args[sc->offset];
tmp = malloc(12);
if (sig > 0 && sig < NSIG) {
int i;
sprintf(tmp, "sig%s", sys_signame[sig]);
for (i = 0; tmp[i] != '\0'; ++i)
tmp[i] = toupper(tmp[i]);
} else {
sprintf(tmp, "%ld", sig);
}
}
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;
/* yuck: get ss_len */
if (get_struct(fd, (void *)args[sc->offset], (void *)&ss,
sizeof(ss.ss_len) + sizeof(ss.ss_family)) == -1)
err(1, "get_struct %p", (void *)args[sc->offset]);
/* sockaddr_un never have the length filled in! */
if (ss.ss_family == AF_UNIX) {
if (get_struct(fd, (void *)args[sc->offset], (void *)&ss,
sizeof(*sun))
== -1)
err(2, "get_struct %p", (void *)args[sc->offset]);
} else {
if (get_struct(fd, (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;
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}
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(FILE *outfile, const char *name, int nargs, char **s_args) {
int i;
int len = 0;
len += fprintf(outfile, "%s(", name);
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for (i = 0; i < nargs; i++) {
if (s_args[i])
len += fprintf(outfile, "%s", s_args[i]);
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else
len += fprintf(outfile, "<missing argument>");
len += fprintf(outfile, "%s", i < (nargs - 1) ? "," : "");
}
len += fprintf(outfile, ")");
for (i = 0; i < 6 - (len / 8); i++)
fprintf(outfile, "\t");
}
void
print_syscall_ret(FILE *outfile, const char *name, int nargs, char **s_args, int errorp, int retval) {
print_syscall(outfile, name, nargs, s_args);
if (errorp) {
fprintf(outfile, " ERR#%d '%s'\n", retval, strerror(retval));
} else {
fprintf(outfile, " = %d (0x%x)\n", retval, retval);
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}
}