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/*
* The PCI Library -- ID to Name Cache
*
* Copyright (c) 2008--2009 Martin Mares <mj@ucw.cz>
*
* Can be freely distributed and used under the terms of the GNU GPL v2+.
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "internal.h"
#include "names.h"
#ifdef PCI_USE_DNS
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <pwd.h>
#include <unistd.h>
static const char cache_version[] = "#PCI-CACHE-1.0";
static char *get_cache_name(struct pci_access *a)
{
if (!a->id_cache_name)
{
char *name = pci_get_param(a, "net.cache_name");
if (!name || !name[0])
return NULL;
if (strncmp(name, "~/", 2))
a->id_cache_name = pci_strdup(a, name);
else
{
uid_t uid = getuid();
struct passwd *pw = getpwuid(uid);
if (!pw)
return name;
a->id_cache_name = pci_malloc(a, strlen(pw->pw_dir) + strlen(name+1) + 1);
sprintf(a->id_cache_name, "%s%s", pw->pw_dir, name+1);
}
}
return a->id_cache_name;
}
static void create_parent_dirs(struct pci_access *a, char *name)
{
// Assumes that we have a private copy of the name we can modify
char *p = name + strlen(name);
while (p > name && *p != '/')
p--;
if (p == name)
return;
while (p > name)
{
// We stand at a slash. Check if the current prefix exists.
*p = 0;
struct stat st;
int res = stat(name, &st);
*p = '/';
if (res >= 0)
break;
// Does not exist yet, move up one directory
p--;
while (p > name && *p != '/')
p--;
}
// We now stand at the end of the longest existing prefix.
// Create all directories to the right of it.
for (;;)
{
p++;
while (*p && *p != '/')
p++;
if (!*p)
break;
*p = 0;
int res = mkdir(name, 0777);
if (res < 0)
{
a->warning("Cannot create directory %s: %s", name, strerror(errno));
*p = '/';
break;
}
*p = '/';
}
}
int
pci_id_cache_load(struct pci_access *a, int flags)
{
char *name;
char line[MAX_LINE];
FILE *f;
int lino;
if (a->id_cache_status > 0)
return 0;
a->id_cache_status = 1;
name = get_cache_name(a);
if (!name)
return 0;
a->debug("Using cache %s\n", name);
if (flags & PCI_LOOKUP_REFRESH_CACHE)
{
a->debug("Not loading cache, will refresh everything\n");
a->id_cache_status = 2;
return 0;
}
f = fopen(name, "rb");
if (!f)
{
a->debug("Cache file does not exist\n");
return 0;
}
/* FIXME: Compare timestamp with the pci.ids file? */
lino = 0;
while (fgets(line, sizeof(line), f))
{
char *p = strchr(line, '\n');
lino++;
if (p)
{
*p = 0;
if (lino == 1)
{
if (strcmp(line, cache_version))
{
a->debug("Unrecognized cache version %s, ignoring\n", line);
break;
}
continue;
}
else
{
int cat, id1, id2, id3, id4, cnt;
if (sscanf(line, "%d%x%x%x%x%n", &cat, &id1, &id2, &id3, &id4, &cnt) >= 5)
{
p = line + cnt;
while (*p && *p == ' ')
p++;
pci_id_insert(a, cat, id1, id2, id3, id4, p, SRC_CACHE);
continue;
}
}
}
a->warning("Malformed cache file %s (line %d), ignoring", name, lino);
break;
}
if (ferror(f))
a->warning("Error while reading %s", name);
fclose(f);
return 1;
}
void
pci_id_cache_flush(struct pci_access *a)
{
int orig_status = a->id_cache_status;
FILE *f;
unsigned int h;
struct id_entry *e, *e2;
char hostname[256], *tmpname, *name;
int this_pid;
a->id_cache_status = 0;
if (orig_status < 2)
return;
name = get_cache_name(a);
if (!name)
return;
create_parent_dirs(a, name);
this_pid = getpid();
if (gethostname(hostname, sizeof(hostname)) < 0)
hostname[0] = 0;
else
hostname[sizeof(hostname)-1] = 0;
tmpname = pci_malloc(a, strlen(name) + strlen(hostname) + 64);
sprintf(tmpname, "%s.tmp-%s-%d", name, hostname, this_pid);
f = fopen(tmpname, "wb");
if (!f)
{
a->warning("Cannot write to %s: %s", name, strerror(errno));
pci_mfree(tmpname);
return;
}
a->debug("Writing cache to %s\n", name);
fprintf(f, "%s\n", cache_version);
for (h=0; h<HASH_SIZE; h++)
for (e=a->id_hash[h]; e; e=e->next)
if (e->src == SRC_CACHE || e->src == SRC_NET)
{
/* Negative entries are not written */
if (!e->name[0])
continue;
/* Verify that every entry is written at most once */
for (e2=a->id_hash[h]; e2 != e; e2=e2->next)
if ((e2->src == SRC_CACHE || e2->src == SRC_NET) &&
e2->cat == e->cat &&
e2->id12 == e->id12 && e2->id34 == e->id34)
break;
if (e2 == e)
fprintf(f, "%d %x %x %x %x %s\n",
e->cat,
pair_first(e->id12), pair_second(e->id12),
pair_first(e->id34), pair_second(e->id34),
e->name);
}
fflush(f);
if (ferror(f))
a->warning("Error writing %s", name);
fclose(f);
if (rename(tmpname, name) < 0)
{
a->warning("Cannot rename %s to %s: %s", tmpname, name, strerror(errno));
unlink(tmpname);
}
pci_mfree(tmpname);
}
#else
int pci_id_cache_load(struct pci_access *a UNUSED, int flags UNUSED)
{
a->id_cache_status = 1;
return 0;
}
void pci_id_cache_flush(struct pci_access *a)
{
a->id_cache_status = 0;
pci_mfree(a->id_cache_name);
a->id_cache_name = NULL;
}
#endif
void
pci_id_cache_dirty(struct pci_access *a)
{
if (a->id_cache_status >= 1)
a->id_cache_status = 2;
}
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