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/* Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include <ctype.h>
#include <stdio.h>
#include <string.h>
#include "util.h"
#include "libconstants.h"
#include "libsyscalls.h"
/*
* These are syscalls used by the syslog() C library call. You can find them
* by running a simple test program. See below for x86_64 behavior:
* $ cat test.c
* #include <syslog.h>
* main() { syslog(0, "foo"); }
* $ gcc test.c -static
* $ strace ./a.out
* ...
* socket(PF_FILE, SOCK_DGRAM|SOCK_CLOEXEC, 0) = 3 <- look for socket connection
* connect(...) <- important
* sendto(...) <- important
* exit_group(0) <- finish!
*/
#if defined(__x86_64__)
#if defined(__ANDROID__)
const char *log_syscalls[] = {"socket", "connect", "fcntl", "writev"};
#else
const char *log_syscalls[] = {"connect", "sendto"};
#endif
#elif defined(__i386__)
#if defined(__ANDROID__)
const char *log_syscalls[] = {"socketcall", "writev", "fcntl64",
"clock_gettime"};
#else
const char *log_syscalls[] = {"socketcall", "time"};
#endif
#elif defined(__arm__)
#if defined(__ANDROID__)
const char *log_syscalls[] = {"clock_gettime", "connect", "fcntl64", "socket",
"writev"};
#else
const char *log_syscalls[] = {"connect", "gettimeofday", "send"};
#endif
#elif defined(__aarch64__)
#if defined(__ANDROID__)
const char *log_syscalls[] = {"connect", "fcntl", "sendto", "socket", "writev"};
#else
const char *log_syscalls[] = {"connect", "send"};
#endif
#elif defined(__powerpc__) || defined(__ia64__) || defined(__hppa__) || \
defined(__sparc__) || defined(__mips__)
const char *log_syscalls[] = {"connect", "send"};
#else
#error "Unsupported platform"
#endif
const size_t log_syscalls_len = sizeof(log_syscalls)/sizeof(log_syscalls[0]);
long int parse_single_constant(char *constant_str, char **endptr);
int lookup_syscall(const char *name)
{
const struct syscall_entry *entry = syscall_table;
for (; entry->name && entry->nr >= 0; ++entry)
if (!strcmp(entry->name, name))
return entry->nr;
return -1;
}
const char *lookup_syscall_name(int nr)
{
const struct syscall_entry *entry = syscall_table;
for (; entry->name && entry->nr >= 0; ++entry)
if (entry->nr == nr)
return entry->name;
return NULL;
}
long int parse_constant(char *constant_str, char **endptr)
{
long int value = 0;
char *group, *lastpos = constant_str;
char *original_constant_str = constant_str;
/*
* Try to parse constants separated by pipes. Note that since
* |constant_str| is an atom, there can be no spaces between the
* constant and the pipe. Constants can be either a named constant
* defined in libconstants.gen.c or a number parsed with strtol.
*
* If there is an error parsing any of the constants, the whole process
* fails.
*/
while ((group = tokenize(&constant_str, "|")) != NULL) {
char *end = group;
value |= parse_single_constant(group, &end);
if (end == group) {
lastpos = original_constant_str;
value = 0;
break;
}
lastpos = end;
}
if (endptr)
*endptr = lastpos;
return value;
}
long int parse_single_constant(char *constant_str, char **endptr)
{
const struct constant_entry *entry = constant_table;
for (; entry->name; ++entry) {
if (!strcmp(entry->name, constant_str)) {
if (endptr)
*endptr = constant_str + strlen(constant_str);
return entry->value;
}
}
return strtol(constant_str, endptr, 0);
}
char *strip(char *s)
{
char *end;
while (*s && isblank(*s))
s++;
end = s + strlen(s) - 1;
while (end >= s && *end && (isblank(*end) || *end == '\n'))
end--;
*(end + 1) = '\0';
return s;
}
char *tokenize(char **stringp, const char *delim)
{
char *ret = NULL;
/* If the string is NULL or empty, there are no tokens to be found. */
if (stringp == NULL || *stringp == NULL || **stringp == '\0')
return NULL;
/*
* If the delimiter is NULL or empty,
* the full string makes up the only token.
*/
if (delim == NULL || *delim == '\0') {
ret = *stringp;
*stringp = NULL;
return ret;
}
char *found;
while (**stringp != '\0') {
found = strstr(*stringp, delim);
if (!found) {
/*
* The delimiter was not found, so the full string
* makes up the only token, and we're done.
*/
ret = *stringp;
*stringp = NULL;
break;
}
if (found != *stringp) {
/* There's a non-empty token before the delimiter. */
*found = '\0';
ret = *stringp;
*stringp = found + strlen(delim);
break;
}
/*
* The delimiter was found at the start of the string,
* skip it and keep looking for a non-empty token.
*/
*stringp += strlen(delim);
}
return ret;
}
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