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#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "libldetect.h"
#include "common.h"
#include "names.h"
static char *proc_usb_path_default = "/sys/kernel/debug/usb/devices";
char *proc_usb_path = NULL;
static void build_text(struct pciusb_entry *e, char *vendor_text, char *product_text) {
if(e) {
if(!vendor_text) {
char const* vendorname;
vendorname = names_vendor(e->vendor);
if(vendorname) {
vendor_text = malloc(strlen(vendorname)+2);
sprintf(vendor_text, "%s|", vendorname);
} else
vendor_text = strdup("Unknown|");
}
if(!product_text) {
char const* productname;
productname = names_product(e->vendor, e->device);
if(productname) {
product_text = strdup(productname);
} else
product_text = strdup("Unknown");
}
vendor_text = realloc(vendor_text, strlen(vendor_text)+strlen(product_text)+1);
e->text = vendor_text;
strcat(e->text, product_text);
free(product_text);
}
}
extern struct pciusb_entries usb_probe(void) {
FILE *f;
char buf[BUF_SIZE];
int line;
struct pciusb_entries r;
struct pciusb_entry *e = NULL;
char *vendor_text = NULL, *product_text = NULL;
size_t allocated = MAX_DEVICES;
r.nb = 0;
names_init();
if (!(f = fopen(proc_usb_path ? proc_usb_path : proc_usb_path_default, "r"))) {
if (proc_usb_path) {
char *err_msg;
asprintf(&err_msg, "unable to open \"%s\"\n"
"You may have passed a wrong argument to the \"-u\" option.\n"
"fopen() sets errno to", proc_usb_path);
perror(err_msg);
free(err_msg);
}
r.entries = NULL;
goto exit;
}
r.entries = malloc(sizeof(struct pciusb_entry) * MAX_DEVICES);
/* for further information on the format parsed by this state machine,
* read /usr/share/doc/kernel-doc-X.Y.Z/usb/proc_usb_info.txt */
for (line = 1; fgets(buf, sizeof(buf) - 1, f); line++) {
if (r.nb >= allocated) {
allocated = r.nb*2;
r.entries = realloc(r.entries, sizeof(struct pciusb_entry) * allocated);
}
switch (buf[0]) {
case 'T': {
unsigned short pci_bus, pci_device, usb_port;
build_text(e, vendor_text, product_text);
vendor_text = NULL;
product_text = NULL;
e = &r.entries[r.nb++];
pciusb_initialize(e);
if (sscanf(buf, "T: Bus=%02hd Lev=%*02d Prnt=%*04d Port=%02hd Cnt=%*02d Dev#=%3hd Spd=%*3s MxCh=%*2d", &pci_bus, &usb_port, &pci_device) == 3) {
e->pci_bus = pci_bus;
e->pci_device = pci_device;
e->usb_port = usb_port;
} else fprintf(stderr, "%s %d: unknown ``T'' line\n", proc_usb_path, line);
break;
}
case 'P': {
unsigned short vendor, device;
if (sscanf(buf, "P: Vendor=%hx ProdID=%hx", &vendor, &device) == 2) {
e->vendor = vendor;
e->device = device;
} else fprintf(stderr, "%s %d: unknown ``P'' line\n", proc_usb_path, line);
break;
}
case 'I': if (e->class_id == 0 || e->module == NULL) {
char driver[50];
int class_id, sub, prot = 0;
if (sscanf(buf, "I:* If#=%*2d Alt=%*2d #EPs=%*2d Cls=%02x(%*5c) Sub=%02x Prot=%02x Driver=%s", &class_id, &sub, &prot, driver) >= 3) {
unsigned long cid = (class_id * 0x100 + sub) * 0x100 + prot;
if (e->class_id == 0)
e->class_id = cid;
if (strncmp(driver, "(none)", 6)) {
char *p;
/* Get current class if we are on the first one having used by a driver */
e->class_id = cid;
e->module = strdup(driver);
/* replace '-' characters with '_' to be compliant with modnames from modaliases */
p = e->module;
while (p && *p) {
if (*p == '-') *p = '_';
p++;
}
}
/* see linux/sound/usb/usbaudio.c::usb_audio_ids */
if (e->class_id == (0x1*0x100+ 0x01)) /* USB_AUDIO_CLASS*0x100 + USB_SUBCLASS_AUDIO_CONTROL*/
e->module = strdup("snd_usb_audio");
} else if (sscanf(buf, "I: If#=%*2d Alt=%*2d #EPs=%*2d Cls=%02x(%*5c) Sub=%02x Prot=%02x Driver=%s", &class_id, &sub, &prot, driver) >= 3) {
/* Ignore interfaces not active */
} else fprintf(stderr, "%s %d: unknown ``I'' line\n", proc_usb_path, line);
break;
}
case 'S': {
int offset;
char dummy;
size_t length = strlen(buf) -1;
if (sscanf(buf, "S: Manufacturer=%n%c", &offset, &dummy) == 1) {
buf[length] = '|'; /* replacing '\n' by '|' */
vendor_text = strdup(buf + offset);
} else if (sscanf(buf, "S: Product=%n%c", &offset, &dummy) == 1) {
buf[length] = 0; /* removing '\n' */
product_text = strdup(buf + offset);
}
}
}
}
build_text(e, vendor_text, product_text);
fclose(f);
/* shrink to real size */
r.entries = realloc(r.entries, sizeof(struct pciusb_entry) * r.nb);
pciusb_find_modules(&r, "usbtable", DO_NOT_LOAD, 0);
exit:
names_exit();
return r;
}
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