diff options
| -rw-r--r-- | util-linux/mdev.c | 113 |
1 files changed, 63 insertions, 50 deletions
diff --git a/util-linux/mdev.c b/util-linux/mdev.c index c100e0fa6..aef84ac45 100644 --- a/util-linux/mdev.c +++ b/util-linux/mdev.c @@ -23,19 +23,20 @@ #include "xregex.h" #define DEV_PATH "/dev" +#define MDEV_CONF "/etc/mdev.conf" #include <busybox.h> /* mknod in /dev based on a path like "/sys/block/hda/hda1" */ static void make_device(char *path) { - char *device_name,*s; - int major,minor,type,len,fd; - int mode=0660; - uid_t uid=0; - gid_t gid=0; + char *device_name, *s; + int major, minor, type, len, fd; + int mode = 0660; + uid_t uid = 0; + gid_t gid = 0; - RESERVE_CONFIG_BUFFER(temp,PATH_MAX); + RESERVE_CONFIG_BUFFER(temp, PATH_MAX); /* Try to read major/minor string */ @@ -43,60 +44,64 @@ static void make_device(char *path) fd = open(temp, O_RDONLY); len = read(fd, temp, PATH_MAX-1); close(fd); - if (len<1) goto end; + if (len < 1) goto end; /* Determine device name, type, major and minor */ device_name = strrchr(path, '/') + 1; - type = strncmp(path+5, "block/" ,6) ? S_IFCHR : S_IFBLK; - if(sscanf(temp, "%d:%d", &major, &minor) != 2) goto end; + type = strncmp(path+5, "block/", 6) ? S_IFCHR : S_IFBLK; + if (sscanf(temp, "%d:%d", &major, &minor) != 2) + goto end; /* If we have a config file, look up permissions for this device */ if (ENABLE_FEATURE_MDEV_CONF) { - char *conf,*pos,*end; + char *conf, *pos, *end; /* mmap the config file */ - if (-1!=(fd=open("/etc/mdev.conf",O_RDONLY))) { - len=lseek(fd,0,SEEK_END); - conf=mmap(NULL,len,PROT_READ,MAP_PRIVATE,fd,0); + if (-1 != (fd=open(MDEV_CONF,O_RDONLY))) { + len = lseek(fd, 0, SEEK_END); + conf = mmap(NULL, len, PROT_READ, MAP_PRIVATE, fd, 0); if (conf) { - int line=0; + int line = 0; /* Loop through lines in mmaped file*/ - for (pos=conf;pos-conf<len;) { + for (pos=conf; pos-conf<len;) { int field; char *end2; line++; /* find end of this line */ - for(end=pos;end-conf<len && *end!='\n';end++); + for(end=pos; end-conf<len && *end!='\n'; end++) + ; /* Three fields: regex, uid:gid, mode */ - for (field=3;field;field--) { + for (field=3; field; field--) { /* Skip whitespace */ - while (pos<end && isspace(*pos)) pos++; - if (pos==end || *pos=='#') break; - for (end2=pos; - end2<end && !isspace(*end2) && *end2!='#'; end2++); - switch(field) { + while (pos<end && isspace(*pos)) + pos++; + if (pos==end || *pos=='#') + break; + for (end2=pos; end2<end && !isspace(*end2) && *end2!='#'; end2++) + ; + + switch (field) { /* Regex to match this device */ case 3: { - char *regex=strndupa(pos,end2-pos); + char *regex = strndupa(pos,end2-pos); regex_t match; regmatch_t off; int result; /* Is this it? */ xregcomp(&match,regex,REG_EXTENDED); - result=regexec(&match,device_name,1,&off,0); + result = regexec(&match,device_name,1,&off,0); regfree(&match); /* If not this device, skip rest of line */ - if(result || off.rm_so - || off.rm_eo!=strlen(device_name)) - goto end_line; + if (result || off.rm_so || off.rm_eo!=strlen(device_name)) + goto end_line; break; } @@ -106,48 +111,54 @@ static void make_device(char *path) char *s2; /* Find : */ - for(s=pos;s<end2 && *s!=':';s++); - if(s==end2) goto end_line; + for(s=pos; s<end2 && *s!=':'; s++) + ; + if (s == end2) + goto end_line; /* Parse UID */ - uid=strtoul(pos,&s2,10); - if(s!=s2) { + uid = strtoul(pos,&s2,10); + if (s != s2) { struct passwd *pass; - pass=getpwnam(strndupa(pos,s-pos)); - if(!pass) goto end_line; - uid=pass->pw_uid; + pass = getpwnam(strndupa(pos,s-pos)); + if (!pass) + goto end_line; + uid = pass->pw_uid; } s++; /* parse GID */ - gid=strtoul(s,&s2,10); - if(end2!=s2) { + gid = strtoul(s,&s2,10); + if (end2 != s2) { struct group *grp; - grp=getgrnam(strndupa(s,end2-s)); - if(!grp) goto end_line; - gid=grp->gr_gid; + grp = getgrnam(strndupa(s,end2-s)); + if (!grp) + goto end_line; + gid = grp->gr_gid; } break; } /* mode */ case 1: { - mode=strtoul(pos,&pos,8); - if(pos!=end2) goto end_line; - goto found_device; + mode = strtoul(pos,&pos,8); + if (pos != end2) + goto end_line; + else + goto found_device; } } - pos=end2; + pos = end2; } end_line: /* Did everything parse happily? */ if (field && field!=3) - bb_error_msg_and_die("Bad line %d",line); + bb_error_msg_and_die("Bad line %d",line); /* Next line */ - pos=++end; + pos = ++end; } found_device: - munmap(conf,len); + munmap(conf, len); } close(fd); } @@ -170,7 +181,7 @@ end: static void find_dev(char *path) { DIR *dir; - size_t len=strlen(path); + size_t len = strlen(path); struct dirent *entry; if ((dir = opendir(path)) == NULL) @@ -180,7 +191,8 @@ static void find_dev(char *path) /* Skip "." and ".." (also skips hidden files, which is ok) */ - if (entry->d_name[0]=='.') continue; + if (entry->d_name[0] == '.') + continue; if (entry->d_type == DT_DIR) { snprintf(path+len, PATH_MAX-len, "/%s", entry->d_name); @@ -214,7 +226,8 @@ int mdev_main(int argc, char *argv[]) } else { action = getenv("ACTION"); env_path = getenv("DEVPATH"); - if (!action || !env_path) bb_show_usage(); + if (!action || !env_path) + bb_show_usage(); if (!strcmp(action, "add")) { sprintf(temp, "/sys%s", env_path); @@ -225,6 +238,6 @@ int mdev_main(int argc, char *argv[]) } } - if(ENABLE_FEATURE_CLEAN_UP) RELEASE_CONFIG_BUFFER(temp); + if (ENABLE_FEATURE_CLEAN_UP) RELEASE_CONFIG_BUFFER(temp); return 0; } |