diff options
Diffstat (limited to 'extras/scsi_id/scsi_id.c')
| -rw-r--r-- | extras/scsi_id/scsi_id.c | 827 |
1 files changed, 827 insertions, 0 deletions
diff --git a/extras/scsi_id/scsi_id.c b/extras/scsi_id/scsi_id.c new file mode 100644 index 0000000000..d34d9284e5 --- /dev/null +++ b/extras/scsi_id/scsi_id.c @@ -0,0 +1,827 @@ +/* + * scsi_id.c + * + * Main section of the scsi_id program + * + * Copyright (C) IBM Corp. 2003 + * + * This library is free software; you can redistribute it and/or modify + * it under the terms of the GNU Lesser General Public License as + * published by the Free Software Foundation; either version 2.1 of the + * License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 + * USA + */ + +#include <stdio.h> +#include <stdlib.h> +#include <getopt.h> +#include <unistd.h> +#include <signal.h> +#include <fcntl.h> +#include <errno.h> +#include <string.h> +#include <syslog.h> +#include <stdarg.h> +#include <ctype.h> +#include <sys/stat.h> +#include <sys/libsysfs.h> +#include "scsi_id.h" + +#ifndef VERSION +#warning No version +#define VERSION "unknown" +#endif + +/* + * temporary names for mknod. + */ +#define TMP_DIR "/tmp" +#define TMP_PREFIX "scsi" + +#define CONFIG_FILE "/etc/scsi_id.config" + +#define MAX_NAME_LEN 72 + +#define MAX_SERIAL_LEN 128 + +static const char short_options[] = "bc:d:ef:gip:s:vV"; +static const struct option long_options[] = { + {"broken", no_argument, NULL, 'b'}, /* also per dev */ + {"callout", required_argument, NULL, 'c'}, /* also per dev */ + {"device", required_argument, NULL, 'd'}, + {"stderr", no_argument, NULL, 'e'}, + {"file", required_argument, NULL, 'f'}, + {"good", no_argument, NULL, 'g'}, /* also per dev */ + {"busid", no_argument, NULL, 'i'}, /* also per dev */ + {"page", required_argument, NULL, 'p'}, /* also per dev */ + {"devpath", required_argument, NULL, 's'}, + {"verbose", no_argument, NULL, 'v'}, + {"version", no_argument, NULL, 'V'}, + {0, 0, 0, 0} +}; +/* + * Just duplicate per dev options. + */ +static const char dev_short_options[] = "bc:gp:"; +static const struct option dev_long_options[] = { + {"broken", no_argument, NULL, 'b'}, /* also per dev */ + {"callout", required_argument, NULL, 'c'}, /* also per dev */ + {"good", no_argument, NULL, 'g'}, /* also per dev */ + {"page", required_argument, NULL, 'p'}, /* also per dev */ + {0, 0, 0, 0} +}; + +char sysfs_mnt_path[SYSFS_PATH_MAX]; + +static int all_good; +static char *default_callout; +static int dev_specified; +static int sys_specified; +static char config_file[MAX_NAME_LEN] = CONFIG_FILE; +static int display_bus_id; +static int default_page_code; +static int use_stderr; +static int debug; +static int hotplug_mode; + +void log_message (int level, const char *format, ...) +{ + va_list args; + + if (!debug && level == LOG_DEBUG) + return; + + va_start (args, format); + if (!hotplug_mode || use_stderr) { + vfprintf(stderr, format, args); + } else { + static int logging_init = 0; + if (!logging_init) { + openlog ("scsi_id", LOG_PID, LOG_DAEMON); + logging_init = 1; + } + + vsyslog(level, format, args); + } + va_end (args); + return; +} + +static int sysfs_get_actual_dev(const char *sysfs_path, char *dev, int len) +{ + dprintf("%s\n", sysfs_path); + strncpy(dev, sysfs_path, len); + strncat(dev, "/device", len); + if (sysfs_get_link(dev, dev, len)) { + if (!hotplug_mode) + log_message(LOG_WARNING, "%s: %s\n", dev, + strerror(errno)); + return -1; + } + return 0; +} + +/* + * sysfs_is_bus: Given the sysfs_path to a device, return 1 if sysfs_path + * is on bus, 0 if not on bus, and < 0 on error + */ +static int sysfs_is_bus(const char *sysfs_path, const char *bus) +{ + char bus_dev_name[SYSFS_PATH_MAX]; + char bus_id[SYSFS_NAME_LEN]; + struct stat stat_buf; + ino_t dev_inode; + + dprintf("%s\n", sysfs_path); + + if (sysfs_get_name_from_path(sysfs_path, bus_id, SYSFS_NAME_LEN)) + return -1; + + snprintf(bus_dev_name, MAX_NAME_LEN, "%s/%s/%s/%s/%s", sysfs_mnt_path, + SYSFS_BUS_DIR, bus, SYSFS_DEVICES_NAME, bus_id); + + if (stat(sysfs_path, &stat_buf)) + return -1; + dev_inode = stat_buf.st_ino; + + if (stat(bus_dev_name, &stat_buf)) { + if (errno == ENOENT) + return 0; + else + return -1; + } + if (dev_inode == stat_buf.st_ino) + return 1; + else + return 0; +} + +static int get_major_minor(const char *devpath, int *major, int *minor) +{ + struct sysfs_class_device *class_dev; + char dev_value[SYSFS_NAME_LEN]; + char *dev; + + dprintf("%s\n", devpath); + class_dev = sysfs_open_class_device(devpath); + if (!class_dev) { + log_message(LOG_WARNING, "open class %s failed: %s\n", devpath, + strerror(errno)); + return -1; + } + + dev = sysfs_get_attr(class_dev, "dev"); + if (dev) + strncpy(dev_value, dev, SYSFS_NAME_LEN); + sysfs_close_class_device(class_dev); + if (!dev) { + /* + * XXX This happens a lot, since sg has no dev attr. + * Someday change this back to a LOG_WARNING. + */ + log_message(LOG_DEBUG, "%s could not get dev attribute: %s\n", + devpath, strerror(errno)); + return -1; + } + dev = NULL; + + dprintf("dev %s", dev_value); /* dev_value has a trailing \n */ + if (sscanf(dev_value, "%u:%u", major, minor) != 2) { + log_message(LOG_WARNING, "%s: invalid dev major/minor\n", + devpath); + return -1; + } + + return 0; +} + +static int create_tmp_dev(const char *devpath, char *tmpdev, int dev_type) +{ + int major, minor; + + dprintf("(%s)\n", devpath); + + if (get_major_minor(devpath, &major, &minor)) + return -1; + snprintf(tmpdev, MAX_NAME_LEN, "%s/%s-maj%d-min%d-%u", + TMP_DIR, TMP_PREFIX, major, minor, getpid()); + + dprintf("tmpdev '%s'\n", tmpdev); + + if (mknod(tmpdev, 0600 | dev_type, makedev(major, minor))) { + log_message(LOG_WARNING, "mknod failed: %s\n", strerror(errno)); + return -1; + } + return 0; +} + +static int has_sysfs_prefix(const char *path, const char *prefix) +{ + char match[MAX_NAME_LEN]; + + strncpy(match, sysfs_mnt_path, MAX_NAME_LEN); + strncat(match, prefix, MAX_NAME_LEN); + if (strncmp(path, match, strlen(match)) == 0) + return 1; + else + return 0; +} + +/* + * get_value: + * + * buf points to an '=' followed by a quoted string ("foo") or a string ending + * with a space or ','. + * + * Return a pointer to the NUL terminated string, returns NULL if no + * matches. + */ +static char *get_value(char **buffer) +{ + static char *quote_string = "\"\n"; + static char *comma_string = ",\n"; + char *val; + char *end; + + if (**buffer == '"') { + /* + * skip leading quote, terminate when quote seen + */ + (*buffer)++; + end = quote_string; + } else { + end = comma_string; + } + val = strsep(buffer, end); + if (val && end == quote_string) + /* + * skip trailing quote + */ + (*buffer)++; + + while (isspace(**buffer)) + (*buffer)++; + + return val; +} + +static int argc_count(char *opts) +{ + int i = 0; + while (*opts != '\0') + if (*opts++ == ' ') + i++; + return i; +} + +/* + * get_file_options: + * + * If vendor == NULL, find a line in the config file with only "OPTIONS="; + * if vendor and model are set find the first OPTIONS line in the config + * file that matches. Set argc and argv to match the OPTIONS string. + * + * vendor and model can end in '\n'. + */ +static int get_file_options(char *vendor, char *model, int *argc, + char ***newargv) +{ + char buffer[256]; + FILE *fd; + char *buf; + char *str1; + char *vendor_in, *model_in, *options_in; /* read in from file */ + int lineno; + int c; + int retval = 0; + static char *prog_string = "arg0"; + + dprintf("vendor='%s'; model='%s'\n", vendor, model); + fd = fopen(config_file, "r"); + if (fd == NULL) { + dprintf("can't open %s\n", config_file); + if (errno == ENOENT) { + return 1; + } else { + log_message(LOG_WARNING, "can't open %s: %s\n", + config_file, strerror(errno)); + return -1; + } + } + + *newargv = NULL; + lineno = 0; + + while (1) { + vendor_in = model_in = options_in = NULL; + + buf = fgets(buffer, sizeof(buffer), fd); + if (buf == NULL) + break; + lineno++; + + while (isspace(*buf)) + buf++; + + if (*buf == '\0') + /* + * blank or all whitespace line + */ + continue; + + if (*buf == '#') + /* + * comment line + */ + continue; + +#ifdef LOTS + dprintf("lineno %d: '%s'\n", lineno, buf); +#endif + str1 = strsep(&buf, "="); + if (str1 && strcasecmp(str1, "VENDOR") == 0) { + str1 = get_value(&buf); + if (!str1) { + retval = -1; + break; + } + vendor_in = str1; + + str1 = strsep(&buf, "="); + if (str1 && strcasecmp(str1, "MODEL") == 0) { + str1 = get_value(&buf); + if (!str1) { + retval = -1; + break; + } + model_in = str1; + str1 = strsep(&buf, "="); + } + } + + if (str1 && strcasecmp(str1, "OPTIONS") == 0) { + str1 = get_value(&buf); + if (!str1) { + retval = -1; + break; + } + options_in = str1; + } + dprintf("config file line %d:" + " vendor '%s'; model '%s'; options '%s'\n", + lineno, vendor_in, model_in, options_in); + /* + * Only allow: [vendor=foo[,model=bar]]options=stuff + */ + if (!options_in || (!vendor_in && model_in)) { + log_message(LOG_WARNING, + "Error parsing config file line %d '%s'\n", + lineno, buffer); + retval = -1; + break; + } + if (vendor == NULL) { + if (vendor_in == NULL) { + dprintf("matched global option\n"); + break; + } + } else if ((vendor_in && strncmp(vendor, vendor_in, + strlen(vendor_in)) == 0) && + (!model_in || (strncmp(model, model_in, + strlen(model_in)) == 0))) { + /* + * Matched vendor and optionally model. + * + * Note: a short vendor_in or model_in can + * give a partial match (that is FOO + * matches FOOBAR). + */ + dprintf("matched vendor/model\n"); + break; + } else { + dprintf("no match\n"); + } + } + + if (retval == 0) { + if (vendor_in != NULL || model_in != NULL || + options_in != NULL) { + /* + * Something matched. Allocate newargv, and store + * values found in options_in. + */ + c = argc_count(options_in) + 2; + *newargv = calloc(c, sizeof(**newargv)); + if (!*newargv) { + log_message(LOG_WARNING, + "Can't allocate memory\n"); + retval = -1; + } else { + *argc = c; + c = 0; + (*newargv)[c] = prog_string; /* nothing */ + for (c = 1; c < *argc; c++) + (*newargv)[c] = strsep(&options_in, " "); + } + } else { + /* + * No matches. + */ + retval = 1; + } + } + fclose(fd); + return retval; +} + +static int set_options(int argc, char **argv, const char *short_opts, + const struct option *long_opts, char *target, + char *maj_min_dev) +{ + int option; + int option_ind; + + /* + * optind is a global extern used by getopt_long. Since we can + * call set_options twice (once for command line, and once for + * config file) we have to reset this back to 0. + */ + optind = 0; + while (1) { + option = getopt_long(argc, argv, short_options, long_options, + &option_ind); + if (option == -1) + break; + + if (optarg) + dprintf("option '%c' arg '%s'\n", option, optarg); + else + dprintf("option '%c'\n", option); + + switch (option) { + case 'b': + all_good = 0; + break; + + case 'c': + default_callout = optarg; + break; + + case 'd': + dev_specified = 1; + strncpy(maj_min_dev, optarg, MAX_NAME_LEN); + break; + + case 'e': + use_stderr = 1; + break; + + case 'f': + strncpy(config_file, optarg, MAX_NAME_LEN); + break; + + case 'g': + all_good = 1; + break; + + case 'i': + display_bus_id = 1; + break; + + case 'p': + if (strcmp(optarg, "0x80") == 0) { + default_page_code = 0x80; + } else if (strcmp(optarg, "0x83") == 0) { + default_page_code = 0x83; + } else { + log_message(LOG_WARNING, + "Unknown page code '%s'\n", optarg); + return -1; + } + break; + + case 's': + sys_specified = 1; + strncpy(target, sysfs_mnt_path, MAX_NAME_LEN); + strncat(target, optarg, MAX_NAME_LEN); + break; + + case 'v': + debug++; + break; + + case 'V': + log_message(LOG_WARNING, "scsi_id version: %s\n", + VERSION); + exit(0); + break; + + default: + log_message(LOG_WARNING, + "Unknown or bad option '%c' (0x%x)\n", + option, option); + return -1; + } + } + return 0; +} + +static int per_dev_options(struct sysfs_class_device *scsi_dev, int *good_bad, + int *page_code, char *callout) +{ + int retval; + int newargc; + char **newargv = NULL; + char *vendor; + char *model; + int option; + int option_ind; + + + *good_bad = all_good; + *page_code = default_page_code; + if (default_callout && (callout != default_callout)) + strncpy(callout, default_callout, MAX_NAME_LEN); + else + callout[0] = '\0'; + + vendor = sysfs_get_attr(scsi_dev, "vendor"); + if (!vendor) { + log_message(LOG_WARNING, "%s: no vendor attribute\n", + scsi_dev->name); + return -1; + } + + model = sysfs_get_attr(scsi_dev, "model"); + if (!vendor) { + log_message(LOG_WARNING, "%s: no model attribute\n", + scsi_dev->name); + return -1; + } + + retval = get_file_options(vendor, model, &newargc, &newargv); + + optind = 0; /* global extern, reset to 0 */ + while (retval == 0) { + option = getopt_long(newargc, newargv, dev_short_options, + dev_long_options, &option_ind); + if (option == -1) + break; + + if (optarg) + dprintf("option '%c' arg '%s'\n", option, optarg); + else + dprintf("option '%c'\n", option); + + switch (option) { + case 'b': + *good_bad = 0; + break; + + case 'c': + strncpy(callout, default_callout, MAX_NAME_LEN); + break; + + case 'g': + *good_bad = 1; + break; + + case 'p': + if (strcmp(optarg, "0x80") == 0) { + *page_code = 0x80; + } else if (strcmp(optarg, "0x83") == 0) { + *page_code = 0x83; + } else { + log_message(LOG_WARNING, + "Unknown page code '%s'\n", optarg); + retval = -1; + } + break; + + default: + log_message(LOG_WARNING, + "Unknown or bad option '%c' (0x%x)\n", + option, option); + retval = -1; + break; + } + } + + if (newargv) + free(newargv); + return retval; +} + +/* + * scsi_id: try to get an id, if one is found, printf it to stdout. + * returns a value passed to exit() - 0 if printed an id, else 1. This + * could be expanded, for example, if we want to report a failure like no + * memory etc. return 2, and return 1 for expected cases (like broken + * device found) that do not print an id. + */ +static int scsi_id(const char *target_path, char *maj_min_dev) +{ + int retval; + int dev_type = 0; + char full_dev_path[MAX_NAME_LEN]; + char serial[MAX_SERIAL_LEN]; + struct sysfs_class_device *scsi_dev; /* of scsi_device full_dev_path */ + int good_dev; + int page_code; + char callout[MAX_NAME_LEN]; + + dprintf("target_path %s\n", target_path); + + /* + * Ugly: depend on the sysfs path to tell us whether this is a + * block or char device. This should probably be encoded in the + * "dev" along with the major/minor. + */ + if (has_sysfs_prefix(target_path, "/block")) { + dev_type = S_IFBLK; + } else if (has_sysfs_prefix(target_path, "/class")) { + dev_type = S_IFCHR; + } else { + if (!hotplug_mode) { + log_message(LOG_WARNING, + "Non block or class device '%s'\n", + target_path); + return 1; + } else { + /* + * Expected in some cases. + */ + dprintf("Non block or class device\n"); + return 0; + } + } + + if (sysfs_get_actual_dev(target_path, full_dev_path, MAX_NAME_LEN)) + return 1; + + dprintf("full_dev_path %s\n", full_dev_path); + + /* + * Allow only scsi devices (those that have a matching device + * under /bus/scsi/devices). + * + * Other block devices can support SG IO, but only ide-cd does, so + * for now, don't bother with anything else. + */ + retval = sysfs_is_bus(full_dev_path, "scsi"); + if (retval == 0) { + if (hotplug_mode) + /* + * Expected in some cases. + */ + dprintf("%s is not a scsi device\n", target_path); + else + log_message(LOG_WARNING, "%s is not a scsi device\n", + target_path); + return 1; + } else if (retval < 0) { + log_message(LOG_WARNING, "sysfs_is_bus failed: %s\n", + strerror(errno)); + return 1; + } + + /* + * mknod a temp dev to communicate with the device. + */ + if (!dev_specified && create_tmp_dev(target_path, maj_min_dev, + dev_type)) { + dprintf("create_tmp_dev failed\n"); + return 1; + } + + scsi_dev = sysfs_open_class_device(full_dev_path); + if (!scsi_dev) { + log_message(LOG_WARNING, "open class %s failed: %s\n", + full_dev_path, strerror(errno)); + return 1; + } + + /* + * Get any per device (vendor + model) options from the config + * file. + */ + retval = per_dev_options(scsi_dev, &good_dev, &page_code, callout); + dprintf("per dev options: good %d; page code 0x%x; callout '%s'\n", + good_dev, page_code, callout); + + if (!good_dev) { + retval = 1; + } else if (callout[0] != '\0') { + /* + * exec vendor callout, pass it only the "name" to be used + * for error messages, and the dev to open. + * + * This won't work if we need to pass on the original + * command line (when not hotplug mode) since the option + * parsing and per dev parsing modify the argv's. + * + * XXX Not implemented yet. And not fully tested ;-) + */ + retval = 1; + } else if (scsi_get_serial(scsi_dev, maj_min_dev, page_code, + serial, MAX_SERIAL_LEN)) { + retval = 1; + } else { + retval = 0; + } + if (!retval) { + if (display_bus_id) + printf("%s ", scsi_dev->name); + printf("%s", serial); + if (!hotplug_mode) + printf("\n"); + dprintf("%s\n", serial); + retval = 0; + } + fflush(stdout); + sysfs_close_class_device(scsi_dev); + + if (!dev_specified) + unlink(maj_min_dev); + + return retval; +} + +int main(int argc, char **argv) +{ + int retval; + char *devpath; + char target_path[MAX_NAME_LEN]; + char maj_min_dev[MAX_NAME_LEN]; + int newargc; + char **newargv; + + if (getenv("DEBUG")) + debug++; + + if ((argc == 2) && (argv[1][0] != '-')) { + hotplug_mode = 1; + dprintf("hotplug assumed\n"); + } + + dprintf("argc is %d\n", argc); + if (sysfs_get_mnt_path(sysfs_mnt_path, MAX_NAME_LEN)) { + log_message(LOG_WARNING, "sysfs_get_mnt_path failed: %s\n", + strerror(errno)); + exit(1); + } + + if (hotplug_mode) { + /* + * There is a kernel race creating attributes, if called + * directly, uncomment the sleep. + */ + /* sleep(1); */ + + devpath = getenv("DEVPATH"); + if (!devpath) { + log_message(LOG_WARNING, "DEVPATH is not set\n"); + exit(1); + } + sys_specified = 1; + + strncpy(target_path, sysfs_mnt_path, MAX_NAME_LEN); + strncat(target_path, devpath, MAX_NAME_LEN); + } else { + if (set_options(argc, argv, short_options, long_options, + target_path, maj_min_dev) < 0) + exit(1); + } + + /* + * Override any command line options set via the config file. This + * is the only way to set options when in hotplug mode. + */ + newargv = NULL; + retval = get_file_options(NULL, NULL, &newargc, &newargv); + if (retval < 0) { + exit(1); + } else if (newargv && (retval == 0)) { + if (set_options(newargc, newargv, short_options, long_options, + target_path, maj_min_dev) < 0) + exit(1); + free(newargv); + } + + if (!sys_specified) { + log_message(LOG_WARNING, "-s must be specified\n"); + exit(1); + } + + retval = scsi_id(target_path, maj_min_dev); + exit(retval); +} |