X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=udev.c;h=b872f42494e68070e34452e6221dca619fb5e650;hp=0aba8c4bf9aa133999dedb8b8e209d078593aaf3;hb=54988802b795328ceba29480611102902e88f572;hpb=c27e69116d3ef0ea069a3c5146009ced08a0238b diff --git a/udev.c b/udev.c index 0aba8c4bf..b872f4249 100644 --- a/udev.c +++ b/udev.c @@ -27,15 +27,39 @@ #include #include #include +#include +#include +#include #include "udev.h" #include "udev_version.h" +#include "udev_dbus.h" +#include "logging.h" #include "namedev.h" #include "udevdb.h" #include "libsysfs/libsysfs.h" +/* global variables */ +char **main_argv; +char **main_envp; -static char *get_action(void) +static void sig_handler(int signum) +{ + dbg("caught signal %d", signum); + switch (signum) { + case SIGINT: + case SIGTERM: + case SIGKILL: + sysbus_disconnect(); + udevdb_exit(); + exit(20 + signum); + break; + default: + dbg("unhandled signal"); + } +} + +static inline char *get_action(void) { char *action; @@ -43,53 +67,222 @@ static char *get_action(void) return action; } +static inline char *get_devpath(void) +{ + char *devpath; + + devpath = getenv("DEVPATH"); + return devpath; +} -static char *get_device(void) +static inline char *get_seqnum(void) { - char *device; + char *seqnum; - device = getenv("DEVPATH"); - return device; + seqnum = getenv("SEQNUM"); + return seqnum; } -char **main_argv; -char **main_envp; +static void print_record(char *path, struct udevice *dev) +{ + printf("P: %s\n", path); + printf("N: %s\n", dev->name); + printf("S: %s\n", dev->symlink); + printf("O: %s\n", dev->owner); + printf("G: %s\n", dev->group); + printf("\n"); +} -int main(int argc, char **argv, char **envp) +enum query_type { + NONE, + NAME, + SYMLINK, + OWNER, + GROUP +}; + +static inline int udev_user(int argc, char **argv) { - char *action; - char *device; - char *subsystem; + static const char short_options[] = "dp:q:rVh"; + int option; int retval = -EINVAL; - - main_argv = argv; - main_envp = envp; + struct udevice dev; + int root = 0; + enum query_type query = NONE; + char result[NAME_SIZE] = ""; + char path[NAME_SIZE] = ""; - if (argc != 2) { - dbg ("unknown number of arguments"); - goto exit; + /* get command line options */ + while (1) { + option = getopt(argc, argv, short_options); + if (option == -1) + break; + + dbg("option '%c'", option); + switch (option) { + case 'p': + dbg("udev path: %s\n", optarg); + strfieldcpy(path, optarg); + break; + + case 'q': + dbg("udev query: %s\n", optarg); + + if (strcmp(optarg, "name") == 0) { + query = NAME; + break; + } + + if (strcmp(optarg, "symlink") == 0) { + query = SYMLINK; + break; + } + + if (strcmp(optarg, "owner") == 0) { + query = OWNER; + break; + } + + if (strcmp(optarg, "group") == 0) { + query = GROUP; + break; + } + + printf("unknown query type\n"); + return -EINVAL; + + case 'r': + root = 1; + break; + + case 'd': + retval = udevdb_open_ro(); + if (retval != 0) { + printf("unable to open udev database\n"); + return -EACCES; + } + retval = udevdb_dump(print_record); + udevdb_exit(); + return retval; + + case 'V': + printf("udev, version %s\n", UDEV_VERSION); + return 0; + + case 'h': + retval = 0; + case '?': + default: + goto help; + } } + /* process options */ + if (query != NONE) { + if (path[0] == '\0') { + printf("query needs device path specified\n"); + return -EINVAL; + } + + retval = udevdb_open_ro(); + if (retval != 0) { + printf("unable to open udev database\n"); + return -EACCES; + } + retval = udevdb_get_dev(path, &dev); + if (retval == 0) { + switch(query) { + case NAME: + if (root) + strfieldcpy(result, udev_root); + strncat(result, dev.name, sizeof(result)); + break; + + case SYMLINK: + strfieldcpy(result, dev.symlink); + break; + + case GROUP: + strfieldcpy(result, dev.group); + break; + + case OWNER: + strfieldcpy(result, dev.owner); + break; + + default: + break; + } + printf("%s\n", result); + } else { + printf("device not found in udev database\n"); + } + udevdb_exit(); + return retval; + } + + if (root) { + printf("%s\n", udev_root); + return 0; + } + +help: + printf("Usage: [-pqrdVh]\n" + " -q TYPE query database for the specified value:\n" + " 'name' name of device node\n" + " 'symlink' pointing to node\n" + " 'owner' of node\n" + " 'group' of node\n" + " -p PATH sysfs device path used for query\n" + " -r print udev root\n" + " -d dump whole database\n" + " -V print udev version\n" + " -h print this help text\n" + "\n"); + return retval; +} + +static char *subsystem_blacklist[] = { + "net", + "scsi_host", + "scsi_device", + "usb_host", + "pci_bus", + "", +}; + +static inline int udev_hotplug(int argc, char **argv) +{ + char *action; + char *devpath; + char *subsystem; + int retval = -EINVAL; + int i; + subsystem = argv[1]; - device = get_device(); - if (!device) { - dbg ("no device?"); + devpath = get_devpath(); + if (!devpath) { + dbg ("no devpath?"); goto exit; } - dbg("looking at %s", device); + dbg("looking at '%s'", devpath); /* we only care about class devices and block stuff */ - if (!strstr(device, "class") && - !strstr(device, "block")) { - dbg("not block or class"); + if (!strstr(devpath, "class") && + !strstr(devpath, "block")) { + dbg("not a block or class device"); goto exit; } - /* but we don't care about net class devices */ - if (strcmp(subsystem, "net") == 0) { - dbg("don't care about net devices"); - goto exit; + /* skip blacklisted subsystems */ + i = 0; + while (subsystem_blacklist[i][0] != '\0') { + if (strcmp(subsystem, subsystem_blacklist[i]) == 0) { + dbg("don't care about '%s' devices", subsystem); + goto exit; + } + i++; } action = get_action(); @@ -98,29 +291,67 @@ int main(int argc, char **argv, char **envp) goto exit; } + /* connect to the system message bus */ + sysbus_connect(); + /* initialize udev database */ retval = udevdb_init(UDEVDB_DEFAULT); if (retval != 0) { - dbg("Unable to initialize database."); - goto exit; + dbg("unable to initialize database"); + goto exit_sysbus; } + /* set up a default signal handler for now */ + signal(SIGINT, sig_handler); + signal(SIGTERM, sig_handler); + signal(SIGKILL, sig_handler); + /* initialize the naming deamon */ namedev_init(); if (strcmp(action, "add") == 0) - retval = udev_add_device(device, argv[1]); + retval = udev_add_device(devpath, subsystem); else if (strcmp(action, "remove") == 0) - retval = udev_remove_device(device, argv[1]); + retval = udev_remove_device(devpath, subsystem); else { - dbg("Unknown action: %s", action); + dbg("unknown action '%s'", action); retval = -EINVAL; } udevdb_exit(); -exit: +exit_sysbus: + /* disconnect from the system message bus */ + sysbus_disconnect(); + +exit: + if (retval > 0) + retval = 0; + + return -retval; +} + +int main(int argc, char **argv, char **envp) +{ + int retval; + main_argv = argv; + main_envp = envp; + + dbg("version %s", UDEV_VERSION); + + /* initialize our configuration */ + udev_init_config(); + + if (argc == 2 && argv[1][0] != '-') { + dbg("called by hotplug"); + retval = udev_hotplug(argc, argv); + } else { + dbg("called by user"); + retval = udev_user(argc, argv); + } + return retval; } +