[PATCH] cleanup udevstart
I just wanted to terminate the snprintf() strings, cause I can see a overflow with closed eyes after all the audit :) But then I changed a bit more to bring it in line with the style of the other files. I replaced the exec_udev() function with the one from udevd, cause we don't need to read the stdout from udev. Please have a look if it still works for you too and not only for usernames with 3 characters :)
This commit is contained in:
kay.sievers@vrfy.org
Greg KH
parent
c58f8c3000
commit
e4dc0e11c1
190
udevstart.c
190
udevstart.c
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@ -27,7 +27,6 @@
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#include <stdio.h>
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#include <errno.h>
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#include <ctype.h>
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#include <signal.h>
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#include <dirent.h>
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#include <sys/wait.h>
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@ -47,133 +46,86 @@ void log_message(int level, const char *format, ...)
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#endif
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#define MAX_PATHLEN 1024
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#define SYSBLOCK "/sys/block"
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#define SYSCLASS "/sys/class"
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#define MAX_PATHLEN 1024
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#define SYSBLOCK "/sys/block"
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#define SYSCLASS "/sys/class"
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#define UDEV_BIN "/sbin/udev"
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static int execute_udev(char *path, char *value, int len)
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static void udev_exec(const char *path, const char* subsystem)
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{
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int retval;
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int res;
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int status;
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int fds[2];
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pid_t pid;
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int value_set = 0;
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char buffer[255];
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char *pos;
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char action[] = "ACTION=add";
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char devpath[MAX_PATHLEN];
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char nosleep[] = "UDEV_NO_SLEEP=1";
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char *env[] = { action, devpath, nosleep, NULL };
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snprintf(devpath, MAX_PATHLEN, "DEVPATH=%s", path);
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devpath[MAX_PATHLEN-1] = '\0';
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retval = pipe(fds);
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if (retval != 0) {
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dbg("pipe failed");
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return -1;
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}
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pid = fork();
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switch(pid) {
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switch (pid) {
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case 0:
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/* child */
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close(STDOUT_FILENO);
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/* dup write side of pipe to STDOUT */
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dup(fds[1]);
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dbg("executing /sbin/udev '%s'", path);
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retval = execl("/sbin/udev", "/sbin/udev", path, NULL);
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info("execution of '%s' failed", path);
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execle(UDEV_BIN, "udev", subsystem, NULL, env);
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dbg("exec of child failed");
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exit(1);
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break;
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case -1:
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dbg("fork failed");
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return -1;
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dbg("fork of child failed");
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break;
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default:
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/* parent reads from fds[0] */
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close(fds[1]);
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retval = 0;
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while (1) {
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res = read(fds[0], buffer, sizeof(buffer) - 1);
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if (res <= 0)
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break;
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buffer[res] = '\0';
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if (res > len) {
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dbg("result len %d too short", len);
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retval = -1;
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}
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if (value_set) {
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dbg("result value already set");
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retval = -1;
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} else {
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value_set = 1;
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strncpy(value, buffer, len);
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pos = value + strlen(value)-1;
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if (pos[0] == '\n')
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pos[0] = '\0';
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dbg("result is '%s'", value);
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}
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}
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close(fds[0]);
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res = wait(&status);
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if (res < 0) {
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dbg("wait failed result %d", res);
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retval = -1;
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}
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if (!WIFEXITED(status) || (WEXITSTATUS(status) != 0)) {
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dbg("exec program status 0x%x", status);
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retval = -1;
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}
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wait(NULL);
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}
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return retval;
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}
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static int udev_scan(void)
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{
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char *devpath;
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DIR *dir;
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struct dirent *dent;
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int retval = -EINVAL;
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char scratch[200];
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char *devpath;
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DIR *dir;
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struct dirent *dent;
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int retval = -EINVAL;
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devpath = "block";
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dir = opendir(SYSBLOCK);
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if (dir) {
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for (dent = readdir(dir); dent; dent = readdir(dir)) {
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char dirname[MAX_PATHLEN];
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DIR *dir2;
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struct dirent *dent2;
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if ((strcmp(dent->d_name, ".") == 0)
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|| (strcmp(dent->d_name, "..") == 0))
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if (dir != NULL) {
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for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
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char dirname[MAX_PATHLEN];
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DIR *dir2;
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struct dirent *dent2;
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if ((strcmp(dent->d_name, ".") == 0) ||
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(strcmp(dent->d_name, "..") == 0))
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continue;
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snprintf(dirname, MAX_PATHLEN, "/block/%s", dent->d_name);
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setenv("DEVPATH", dirname, 1);
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dbg("udev block, 'DEVPATH' = '%s'", dirname);
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execute_udev("block", scratch, sizeof(scratch));
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dirname[MAX_PATHLEN-1] = '\0';
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udev_exec(dirname, "block");
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snprintf(dirname, MAX_PATHLEN, "%s/%s", SYSBLOCK, dent->d_name);
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dir2 = opendir(dirname);
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if (dir2) {
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for (dent2 = readdir(dir2); dent2; dent2 = readdir(dir2)) {
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char dirname2[MAX_PATHLEN];
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DIR *dir3;
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struct dirent *dent3;
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if (dir2 != NULL) {
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for (dent2 = readdir(dir2); dent2 != NULL; dent2 = readdir(dir2)) {
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char dirname2[MAX_PATHLEN];
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DIR *dir3;
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struct dirent *dent3;
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if ((strcmp(dent2->d_name, ".") == 0) ||
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(strcmp(dent2->d_name, "..") == 0))
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continue;
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snprintf(dirname2, MAX_PATHLEN, "%s/%s", dirname, dent2->d_name);
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dirname2[MAX_PATHLEN-1] = '\0';
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dir3 = opendir(dirname2);
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if (dir3) {
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for (dent3 = readdir(dir3); dent3; dent3 = readdir(dir3)) {
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if (dir3 != NULL) {
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for (dent3 = readdir(dir3); dent3 != NULL; dent3 = readdir(dir3)) {
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char filename[MAX_PATHLEN];
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if (strcmp(dent3->d_name, "dev") == 0) {
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snprintf(filename, MAX_PATHLEN, "/block/%s/%s", dent->d_name, dent2->d_name);
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setenv("DEVPATH", filename, 1);
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dbg("udev block, 'DEVPATH' = '%s'", filename);
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execute_udev("block", scratch, sizeof(scratch));
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snprintf(filename, MAX_PATHLEN, "/block/%s/%s",
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dent->d_name, dent2->d_name);
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filename[MAX_PATHLEN-1] = '\0';
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udev_exec(filename, "block");
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}
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}
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}
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@ -184,43 +136,42 @@ static int udev_scan(void)
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devpath = "class";
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dir = opendir(SYSCLASS);
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if (dir) {
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for (dent = readdir(dir); dent; dent = readdir(dir)) {
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char dirname[MAX_PATHLEN];
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DIR *dir2;
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struct dirent *dent2;
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if ((strcmp(dent->d_name, ".") == 0)
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|| (strcmp(dent->d_name, "..") == 0))
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if (dir != NULL) {
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for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
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char dirname[MAX_PATHLEN];
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DIR *dir2;
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struct dirent *dent2;
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if ((strcmp(dent->d_name, ".") == 0) ||
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(strcmp(dent->d_name, "..") == 0))
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continue;
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snprintf(dirname, MAX_PATHLEN, "%s/%s", SYSCLASS, dent->d_name);
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dirname[MAX_PATHLEN] = '\0';
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dir2 = opendir(dirname);
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if (dir2) {
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for (dent2 = readdir(dir2); dent2; dent2 = readdir(dir2)) {
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char dirname2[MAX_PATHLEN];
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DIR *dir3;
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struct dirent *dent3;
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if (dir2 != NULL) {
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for (dent2 = readdir(dir2); dent2 != NULL; dent2 = readdir(dir2)) {
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char dirname2[MAX_PATHLEN-1];
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DIR *dir3;
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struct dirent *dent3;
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if ((strcmp(dent2->d_name, ".") == 0) || (strcmp(dent2->d_name, "..") == 0))
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if ((strcmp(dent2->d_name, ".") == 0) ||
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(strcmp(dent2->d_name, "..") == 0))
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continue;
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snprintf(dirname2, MAX_PATHLEN, "%s/%s", dirname, dent2->d_name);
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dirname2[MAX_PATHLEN-1] = '\0';
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dir3 = opendir(dirname2);
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if (dir3) {
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for (dent3 = readdir(dir3); dent3; dent3 = readdir(dir3)) {
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char
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filename[MAX_PATHLEN];
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if (dir3 != NULL) {
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for (dent3 = readdir(dir3); dent3 != NULL; dent3 = readdir(dir3)) {
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char filename[MAX_PATHLEN];
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if (strcmp(dent3->d_name, "dev") == 0) {
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snprintf
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(filename,
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MAX_PATHLEN,
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"/class/%s/%s", dent->d_name, dent2->d_name);
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setenv("DEVPATH", filename, 1);
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dbg("udev '%s', 'DEVPATH' = '%s'", dent->d_name, filename);
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execute_udev(dent->d_name, scratch, sizeof(scratch));
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snprintf(filename, MAX_PATHLEN, "/class/%s/%s",
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dent->d_name, dent2->d_name);
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filename[MAX_PATHLEN-1] = '\0';
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udev_exec(filename, dent->d_name);
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}
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}
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}
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@ -240,8 +191,5 @@ int main(int argc, char **argv, char **envp)
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{
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init_logging("udevstart");
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setenv("ACTION", "add", 1);
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setenv("UDEV_NO_SLEEP", "1", 1);
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return udev_scan();
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}
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