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Resolving symbolic links in libcdio drive list

This commit is contained in:
Thomas Schmitt 2009-12-25 14:31:55 +00:00
parent 5b72e5d06e
commit 240afa7c3a
2 changed files with 30 additions and 5 deletions
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2
cdrskin/cdrskin_timestamp.h
View File

@ -1 +1 @@
#define Cdrskin_timestamP "2009.12.25.101433"
#define Cdrskin_timestamP "2009.12.25.143326"

33
libburn/sg-libcdio.c
View File

@ -224,6 +224,10 @@ static void enumerate_common(char *fname, int bus_no, int host_no,
int sg_give_next_adr(burn_drive_enumerator_t *idx,
char adr[], int adr_size, int initialize)
{
int i, max_link_depth = 100, ret;
char path[4096], link_target[4096];
struct stat stbuf;
if (initialize == 1) {
idx->pos = idx->ppsz_cd_drives =
cdio_get_devices(DRIVER_DEVICE);
@ -238,9 +242,30 @@ int sg_give_next_adr(burn_drive_enumerator_t *idx,
return 0;
if (*(idx->pos) == NULL)
return 0;
if (strlen(*(idx->pos)) >= adr_size)
/* Resolve eventual softlink, E.g. /dev/cdrom . */;
/* (burn_drive_resolve_link() relies on a completed drive list and
cannot be used here) */
strcpy(path, *(idx->pos));
for (i= 0; i < max_link_depth; i++) {
if (lstat(path, &stbuf) == -1) {
strcpy(path, *(idx->pos));
break; /* dead link */
}
if ((stbuf.st_mode & S_IFMT) != S_IFLNK)
break; /* found target */
ret = readlink(path, link_target, sizeof(link_target));
if (ret == -1) {
strcpy(path, *(idx->pos));
break; /* unreadable link pointer */
}
strcpy(path, link_target);
}
if (i >= max_link_depth) /* endless link loop */
strcpy(path, *(idx->pos));
if (strlen(path) >= adr_size)
return -1;
strcpy(adr, *(idx->pos));
strcpy(adr, path);
(idx->pos)++;
return 1;
}
@ -323,8 +348,8 @@ LIBBURN_MISCONFIGURATION_ = 0;
"libcdio TOO OLD: numeric version %d , need at least %d",
cdio_ver, LIBCDIO_VERSION_NUM);
libdax_msgs_submit(libdax_messenger, d->global_index,
0x00020003,
LIBDAX_MSGS_SEV_SORRY, LIBDAX_MSGS_PRIO_HIGH,
0x00020175,
LIBDAX_MSGS_SEV_FATAL, LIBDAX_MSGS_PRIO_HIGH,
msg, 0, 0);
return 0;
}