/*
* Write a single sysctl setting
*/
static int sysctl_write_setting(const char *setting)
{
int retval;
const char *name;
const char *value;
const char *equals;
char *tmpname, *outname, *cptr;
int fd;
name = setting;
equals = strchr(setting, '=');
if (!equals) {
bb_error_msg(ERR_NO_EQUALS, setting);
return EXIT_FAILURE;
}
value = equals + 1; /* point to the value in name=value */
if (name == equals || !*value) {
bb_error_msg(ERR_MALFORMED_SETTING, setting);
return EXIT_FAILURE;
}
tmpname = xasprintf("%s%.*s", PROC_SYS, (int)(equals - name), name);
outname = xstrdup(tmpname + strlen_PROC_SYS);
while ((cptr = strchr(tmpname, '.')) != NULL)
*cptr = '/';
while ((cptr = strchr(outname, '/')) != NULL)
*cptr = '.';
fd = open(tmpname, O_WRONLY | O_CREAT | O_TRUNC, 0666);
if (fd < 0) {
switch (errno) {
case ENOENT:
if (option_mask32 & FLAG_SHOW_KEY_ERRORS)
bb_error_msg(ERR_INVALID_KEY, outname);
break;
case EACCES:
bb_perror_msg(ERR_PERMISSION_DENIED, outname);
break;
default:
bb_perror_msg(ERR_UNKNOWN_WRITING, outname);
break;
}
retval = EXIT_FAILURE;
} else {
dwrite_str(fd, value);
close(fd);
if (option_mask32 & FLAG_SHOW_KEYS) {
printf("%s = ", outname);
}
puts(value);
retval = EXIT_SUCCESS;
}
free(tmpname);
free(outname);
return retval;
} /* end sysctl_write_setting() */
/*
* Read a sysctl setting
*
*/
int sysctl_read_setting(const char *setting, int output)
{
int retval = 0;
char *tmpname, *outname, *cptr;
char inbuf[1025];
const char *name = setting;
FILE *fp;
if (!setting || !*setting)
bb_error_msg(ERR_INVALID_KEY, setting);
tmpname = concat_path_file(PROC_PATH, name);
outname = xstrdup(tmpname + strlen(PROC_PATH));
while ((cptr = strchr(tmpname, '.')) != NULL)
*cptr = '/';
while ((cptr = strchr(outname, '/')) != NULL)
*cptr = '.';
if ((fp = fopen(tmpname, "r")) == NULL) {
switch (errno) {
case ENOENT:
bb_error_msg(ERR_INVALID_KEY, outname);
break;
case EACCES:
bb_error_msg(ERR_PERMISSION_DENIED, outname);
break;
default:
bb_error_msg(ERR_UNKNOWN_READING, errno, outname);
break;
}
retval = -1;
} else {
while (fgets(inbuf, sizeof(inbuf) - 1, fp)) {
if (output) {
dwrite_str(STDOUT_FILENO, outname);
dwrite_str(STDOUT_FILENO, " = ");
}
dwrite_str(STDOUT_FILENO, inbuf);
}
fclose(fp);
}
free(tmpname);
free(outname);
return retval;
} /* end sysctl_read_setting() */
/*
* Write a single sysctl setting
*/
int sysctl_write_setting(const char *setting, int output)
{
int retval = 0;
const char *name = setting;
const char *value;
const char *equals;
char *tmpname, *outname, *cptr;
int fd = -1;
if (!name) /* probably dont' want to display this err */
return 0;
if (!(equals = strchr(setting, '='))) {
bb_error_msg(ERR_NO_EQUALS, setting);
return -1;
}
value = equals + sizeof(char); /* point to the value in name=value */
if (!*name || !*value || name == equals) {
bb_error_msg(ERR_MALFORMED_SETTING, setting);
return -2;
}
tmpname = xasprintf("%s%.*s", PROC_PATH, (int)(equals - name), name);
outname = xstrdup(tmpname + strlen(PROC_PATH));
while ((cptr = strchr(tmpname, '.')) != NULL)
*cptr = '/';
while ((cptr = strchr(outname, '/')) != NULL)
*cptr = '.';
fd = open(tmpname, O_WRONLY | O_CREAT | O_TRUNC, 0666);
if (fd < 0) {
switch (errno) {
case ENOENT:
bb_error_msg(ERR_INVALID_KEY, outname);
break;
case EACCES:
bb_perror_msg(ERR_PERMISSION_DENIED, outname);
break;
default:
bb_error_msg(ERR_UNKNOWN_WRITING, errno, outname);
break;
}
retval = -1;
} else {
dwrite_str(fd, value);
close(fd);
if (output) {
dwrite_str(STDOUT_FILENO, outname);
dwrite_str(STDOUT_FILENO, " = ");
}
dwrite_str(STDOUT_FILENO, value);
dwrite_str(STDOUT_FILENO, "\n");
}
/* cleanup */
free(tmpname);
free(outname);
return retval;
} /* end sysctl_write_setting() */
