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426311f440
The default sysfs path is always set to '/sys' unless the SYSFS_ROOT environment variable is defined. To address security concerns, secure_getenv() is used within util_path_sysfs() to protect against malicious values in SYSFS_ROOT. Additionally, constructing the sysfs path dynamically in an allocated buffer, rather than using a fixed-size buffer, helps prevent potential buffer overflows. These modifications also significantly improve testability by allowing sysfs read and write operations to be redirected to an alternative file path, which enables testing without affecting the active system state. Signed-off-by: Jan Polensky <japo@linux.ibm.com> Reviewed-by: Jan Höppner <hoeppner@linux.ibm.com> Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
98 lines
2.0 KiB
C
98 lines
2.0 KiB
C
/*
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* ipl_tools - Linux for System z reipl and shutdown tools
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*
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* FCP device functions
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*
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* Copyright IBM Corp. 2008, 2017
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*
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* s390-tools is free software; you can redistribute it and/or modify
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* it under the terms of the MIT license. See LICENSE for details.
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*/
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#include "lib/util_libc.h"
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#include "lib/util_path.h"
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#include "ipl_tools.h"
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/*
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* Check if the specified device number is a valid device number
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* which can be found in the /sys/bus/ccw/drivers/zfcp/ structure
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*/
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int fcp_is_device(const char *devno)
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{
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char *path;
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path = util_path_sysfs("bus/ccw/drivers/zfcp/%s", devno);
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if (chdir(path) != 0) {
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free(path);
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return 0;
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}
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free(path);
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return 1;
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}
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/*
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* Return the wwpn of a device
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*/
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void fcp_wwpn_get(const char *device, char *wwpn)
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{
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char buf[20];
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char *path;
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FILE *fh;
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int rc;
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path = util_path_sysfs("block/%s/device/wwpn", device);
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fh = fopen(path, "r");
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if (fh == NULL)
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ERR_EXIT_ERRNO("Could not open \"%s\"", path);
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rc = fscanf(fh, "%s", buf);
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if (rc <= 0)
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ERR_EXIT("Could not lookup WWPN \"%s\"", path);
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util_strlcpy(wwpn, buf, 20);
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fclose(fh);
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free(path);
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}
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/*
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* Return the lun of a device
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*/
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void fcp_lun_get(const char *device, char *lun)
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{
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char buf[20];
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char *path;
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FILE *fh;
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int rc;
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path = util_path_sysfs("block/%s/device/fcp_lun", device);
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fh = fopen(path, "r");
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if (fh == NULL)
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ERR_EXIT_ERRNO("Could not open \"%s\"", path);
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rc = fscanf(fh, "%s", buf);
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if (rc <= 0)
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ERR_EXIT("Could not lookup LUN \"%s\"", path);
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util_strlcpy(lun, buf, 20);
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fclose(fh);
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free(path);
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}
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/*
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* Return the device number of a device
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*/
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void fcp_busid_get(const char *device, char *devno)
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{
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char buf[4096];
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char *path;
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FILE *fh;
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int rc;
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path = util_path_sysfs("block/%s/device/hba_id", device);
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fh = fopen(path, "r");
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if (fh == NULL)
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ERR_EXIT_ERRNO("Could not open \"%s\"", path);
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rc = fscanf(fh, "%s", buf);
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if (rc <= 0)
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ERR_EXIT("Could not find device \"%s\"", path);
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strcpy(devno, buf);
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fclose(fh);
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free(path);
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}
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