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/*
* devices.c - various hardware probing functionality
*
* Copyright (C) 2007 Red Hat, Inc.
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* Author(s): Bill Nottingham <notting@redhat.com>
*/
#include <ctype.h>
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <limits.h>
#include "devices.h"
/* for 'disks', to filter out weird stuff */
#define MINIMUM_INTERESTING_SIZE 32*1024 /* 32MB */
/* from genhd.h, kernel side */
#define GENHD_FL_REMOVABLE 1
#define GENHD_FL_DRIVERFS 2
#define GENHD_FL_MEDIA_CHANGE_NOTIFY 4
#define GENHD_FL_CD 8
#define GENHD_FL_UP 16
#define GENHD_FL_SUPPRESS_PARTITION_INFO 32
#define GENHD_FL_FAIL 64
struct device **getDevices(enum deviceType type) {
struct device **ret = NULL;
struct device *new;
int numdevices = 0;
if (type & (DEVICE_DISK | DEVICE_CDROM)) {
DIR *dir;
struct dirent *ent;
dir = opendir("/sys/block");
if (!dir) goto storagedone;
while ((ent = readdir(dir))) {
char path[64];
char buf[64];
int fd, caps, devtype;
snprintf(path, 64, "/sys/block/%s/capability", ent->d_name);
fd = open(path, O_RDONLY);
if (fd == -1)
continue;
if (read(fd, buf, 63) <= 0) {
close(fd);
continue;
}
close(fd);
errno = 0;
caps = strtol(buf, NULL, 16);
if ((errno == ERANGE && (caps == LONG_MIN || caps == LONG_MAX)) ||
(errno != 0 && caps == 0)) {
return NULL;
}
if (caps & GENHD_FL_CD)
devtype = DEVICE_CDROM;
else
devtype = DEVICE_DISK;
if (!(devtype & type))
continue;
if (devtype == DEVICE_DISK && !(caps & GENHD_FL_REMOVABLE)) {
int size;
snprintf(path, 64, "/sys/block/%s/size", ent->d_name);
fd = open(path, O_RDONLY);
if (fd == -1)
continue;
if (read(fd, buf, 63) <= 0) {
close(fd);
continue;
}
close(fd);
errno = 0;
size = strtol(buf, NULL, 10);
if ((errno == ERANGE && (size == LONG_MIN ||
size == LONG_MAX)) ||
(errno != 0 && size == 0)) {
return NULL;
}
if (size < MINIMUM_INTERESTING_SIZE)
continue;
}
new = calloc(1, sizeof(struct device));
new->device = strdup(ent->d_name);
/* FIXME */
if (asprintf(&new->description, "Storage device %s",
new->device) == -1) {
fprintf(stderr, "%s: %d: %s\n", __func__, __LINE__,
strerror(errno));
fflush(stderr);
abort();
}
new->type = devtype;
if (caps & GENHD_FL_REMOVABLE) {
new->priv.removable = 1;
}
ret = realloc(ret, (numdevices+2) * sizeof(struct device));
ret[numdevices] = new;
ret[numdevices+1] = NULL;
numdevices++;
}
}
storagedone:
if (type & DEVICE_NETWORK) {
DIR *dir;
struct dirent *ent;
dir = opendir("/sys/class/net");
if (!dir) goto netdone;
while ((ent = readdir(dir))) {
char path[64];
int fd, type;
char buf[64];
snprintf(path, 64, "/sys/class/net/%s/type", ent->d_name);
fd = open(path, O_RDONLY);
if (fd == -1)
continue;
if (read(fd, buf, 63) <= 0) {
close(fd);
continue;
}
close(fd);
errno = 0;
type = strtol(buf, NULL, 10);
if ((errno == ERANGE && (type == LONG_MIN || type == LONG_MAX)) ||
(errno != 0 && type == 0)) {
return NULL;
}
if (type != 1)
continue;
new = calloc(1, sizeof(struct device));
new->device = strdup(ent->d_name);
/* FIXME */
snprintf(path, 64, "/sys/class/net/%s/address", ent->d_name);
fd = open(path, O_RDONLY);
if (fd != -1) {
memset(buf, '\0', 64);
if (read(fd, buf, 63) > 0) {
int i;
for (i = (strlen(buf)-1); isspace(buf[i]); i--)
buf[i] = '\0';
new->priv.hwaddr = strdup(buf);
}
}
if (new->priv.hwaddr) {
if (asprintf(&new->description, "Ethernet device %s - %s",
new->device, new->priv.hwaddr) == -1) {
fprintf(stderr, "%s: %d: %s\n", __func__, __LINE__,
strerror(errno));
fflush(stderr);
abort();
}
} else {
if (asprintf(&new->description, "Ethernet device %s",
new->device) == -1) {
fprintf(stderr, "%s: %d: %s\n", __func__, __LINE__,
strerror(errno));
fflush(stderr);
abort();
}
}
ret = realloc(ret, (numdevices+2) * sizeof(struct device));
ret[numdevices] = new;
ret[numdevices+1] = NULL;
numdevices++;
}
}
netdone:
return ret;
}
|
