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Fix parsing of /sys/block/XXX/device symlinks. (#14)

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As of c810bd8d07, I'm not able to use
aaruremote on Linux (5.10). I've tried a few machines and they all have
device sylinks like the following example from my CD dumping machine
(has a mixture of SATA and IDE drives):

/sys/block/sr0/device -> ../../../0:0:0:0
/sys/block/sr1/device -> ../../../0:0:1:0
/sys/block/sr2/device -> ../../../4:0:0:0
/sys/block/sr3/device -> ../../../1:0:0:0
/sys/block/sr4/device -> ../../../3:0:0:0
/sys/block/sr5/device -> ../../../6:0:0:0

I'm not sure how many variants of this symlink exist in Linux, but from
reading the existing code I *think* the intent was to extract the
characters from the start the of last component of the filename up to
the delimeter character (`.` or `:`), so I've reworked the code to do
that without tripping up on the `..` parts of the path.
This commit is contained in:
Daniel Collins
2023-10-16 20:39:17 +01:00
committed by GitHub
parent 28962a75f4
commit 04970bc72a
1 changed files with 14 additions and 28 deletions
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42
linux/device.c
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@@ -157,6 +157,7 @@ int32_t GetDeviceType(void* device_ctx)
const char* dev_name;
const char* sysfs_path;
char* dev_path;
char* dev_path2;
char* host_no;
char* scsi_path;
char* iscsi_path;
@@ -164,7 +165,6 @@ int32_t GetDeviceType(void* device_ctx)
char* fc_path;
char* sas_path;
int ret;
char delim;
char* chrptr;
char* sysfs_path_scr;
FILE* file;
@@ -242,14 +242,21 @@ int32_t GetDeviceType(void* device_ctx)
return dev_type;
}
ret = 0;
delim = '.';
chrptr = strrchr(dev_path, delim);
dev_path2 = strrchr(dev_path, '/');
if(dev_path2)
{
++dev_path2;
}
else
{
dev_path2 = dev_path;
}
chrptr = strchr(dev_path2, '.');
if(!chrptr)
{
delim = ':';
chrptr = strrchr(dev_path, delim);
chrptr = strchr(dev_path2, ':');
}
if(!chrptr)
@@ -265,28 +272,7 @@ int32_t GetDeviceType(void* device_ctx)
return dev_type;
}
chrptr--;
while(chrptr != dev_path)
{
if(chrptr[0] == '/')
{
chrptr++;
break;
}
else if(chrptr[0] == delim)
{
ret = 0;
}
else
{
ret++;
}
chrptr--;
}
memcpy((void*)host_no, chrptr, ret);
memcpy((void*)host_no, dev_path2, (chrptr - dev_path2));
snprintf(spi_path, len, "/sys/class/spi_host/host%s", host_no);
snprintf(fc_path, len, "/sys/class/fc_host/host%s", host_no);