From a99b7846e2abec5e26ab6b764b921d79559e0a0f Mon Sep 17 00:00:00 2001 From: "J. Bruce Fields" Date: Mon, 27 Jun 2011 12:31:07 -0400 Subject: [PATCH] mountd: move fsidtype-specific code to helpers Now we can move these big switch statements into helper functions. Signed-off-by: J. Bruce Fields Signed-off-by: Steve Dickson --- utils/mountd/cache.c | 240 +++++++++++++++++++++++-------------------- 1 file changed, 129 insertions(+), 111 deletions(-) diff --git a/utils/mountd/cache.c b/utils/mountd/cache.c index 897d61d..d2ae456 100644 --- a/utils/mountd/cache.c +++ b/utils/mountd/cache.c @@ -364,60 +364,26 @@ struct parsed_fsid { char *fhuuid; }; -static void nfsd_fh(FILE *f) +int parse_fsid(int fsidtype, int fsidlen, char *fsid, struct parsed_fsid *parsed) { - /* request are: - * domain fsidtype fsid - * interpret fsid, find export point and options, and write: - * domain fsidtype fsid expiry path - */ - char *cp; - char *dom; - int fsidtype; - int fsidlen; - unsigned long long inode64; unsigned int dev; - char fsid[32]; - struct parsed_fsid parsed; - struct exportent *found = NULL; - struct addrinfo *ai = NULL; - char *found_path = NULL; - nfs_export *exp; - int i; - int dev_missing = 0; - - if (readline(fileno(f), &lbuf, &lbuflen) != 1) - return; - - xlog(D_CALL, "nfsd_fh: inbuf '%s'", lbuf); + unsigned long long inode64; - cp = lbuf; - - dom = malloc(strlen(cp)); - if (dom == NULL) - return; - if (qword_get(&cp, dom, strlen(cp)) <= 0) - goto out; - if (qword_get_int(&cp, &fsidtype) != 0) - goto out; - if (fsidtype < 0 || fsidtype > 7) - goto out; /* unknown type */ - if ((fsidlen = qword_get(&cp, fsid, 32)) <= 0) - goto out; + parsed->fsidtype = fsidtype; switch(fsidtype) { case FSID_DEV: /* 4 bytes: 2 major, 2 minor, 4 inode */ if (fsidlen != 8) - goto out; + return -1; memcpy(&dev, fsid, 4); - memcpy(&parsed.inode, fsid+4, 4); - parsed.major = ntohl(dev)>>16; - parsed.minor = ntohl(dev) & 0xFFFF; + memcpy(&parsed->inode, fsid+4, 4); + parsed->major = ntohl(dev)>>16; + parsed->minor = ntohl(dev) & 0xFFFF; break; case FSID_NUM: /* 4 bytes - fsid */ if (fsidlen != 4) - goto out; - memcpy(&parsed.fsidnum, fsid, 4); + return -1; + memcpy(&parsed->fsidnum, fsid, 4); break; case FSID_MAJOR_MINOR: /* 12 bytes: 4 major, 4 minor, 4 inode @@ -425,12 +391,12 @@ static void nfsd_fh(FILE *f) * an historical accident */ if (fsidlen != 12) - goto out; + return -1; memcpy(&dev, fsid, 4); - parsed.major = ntohl(dev); + parsed->major = ntohl(dev); memcpy(&dev, fsid+4, 4); - parsed.minor = ntohl(dev); - memcpy(&parsed.inode, fsid+8, 4); + parsed->minor = ntohl(dev); + memcpy(&parsed->inode, fsid+8, 4); break; case FSID_ENCODE_DEV: /* 8 bytes: 4 byte packed device number, 4 inode */ @@ -438,41 +404,137 @@ static void nfsd_fh(FILE *f) * no-one outside this host has any business interpreting it */ if (fsidlen != 8) - goto out; + return -1; memcpy(&dev, fsid, 4); - memcpy(&parsed.inode, fsid+4, 4); - parsed.major = (dev & 0xfff00) >> 8; - parsed.minor = (dev & 0xff) | ((dev >> 12) & 0xfff00); + memcpy(&parsed->inode, fsid+4, 4); + parsed->major = (dev & 0xfff00) >> 8; + parsed->minor = (dev & 0xff) | ((dev >> 12) & 0xfff00); break; case FSID_UUID4_INUM: /* 4 byte inode number and 4 byte uuid */ if (fsidlen != 8) - goto out; - memcpy(&parsed.inode, fsid, 4); - parsed.uuidlen = 4; - parsed.fhuuid = fsid+4; + return -1; + memcpy(&parsed->inode, fsid, 4); + parsed->uuidlen = 4; + parsed->fhuuid = fsid+4; break; case FSID_UUID8: /* 8 byte uuid */ if (fsidlen != 8) - goto out; - parsed.uuidlen = 8; - parsed.fhuuid = fsid; + return -1; + parsed->uuidlen = 8; + parsed->fhuuid = fsid; break; case FSID_UUID16: /* 16 byte uuid */ if (fsidlen != 16) - goto out; - parsed.uuidlen = 16; - parsed.fhuuid = fsid; + return -1; + parsed->uuidlen = 16; + parsed->fhuuid = fsid; break; case FSID_UUID16_INUM: /* 8 byte inode number and 16 byte uuid */ if (fsidlen != 24) - goto out; + return -1; memcpy(&inode64, fsid, 8); - parsed.inode = inode64; - parsed.uuidlen = 16; - parsed.fhuuid = fsid+8; + parsed->inode = inode64; + parsed->uuidlen = 16; + parsed->fhuuid = fsid+8; break; } + return 0; +} + +static bool match_fsid(struct parsed_fsid *parsed, nfs_export *exp, char *path) +{ + struct stat stb; + int type; + char u[16]; + + if (stat(path, &stb) != 0) + return false; + if (!S_ISDIR(stb.st_mode) && !S_ISREG(stb.st_mode)) + return false; + + switch (parsed->fsidtype) { + case FSID_DEV: + case FSID_MAJOR_MINOR: + case FSID_ENCODE_DEV: + if (stb.st_ino != parsed->inode) + return false; + if (parsed->major != major(stb.st_dev) || + parsed->minor != minor(stb.st_dev)) + return false; + return true; + case FSID_NUM: + if (((exp->m_export.e_flags & NFSEXP_FSID) == 0 || + exp->m_export.e_fsid != parsed->fsidnum)) + return false; + return true; + case FSID_UUID4_INUM: + case FSID_UUID16_INUM: + if (stb.st_ino != parsed->inode) + return false; + goto check_uuid; + case FSID_UUID8: + case FSID_UUID16: + if (!is_mountpoint(path)) + return false; + check_uuid: + if (exp->m_export.e_uuid) + get_uuid(exp->m_export.e_uuid, parsed->uuidlen, u); + else + for (type = 0; + uuid_by_path(path, type, parsed->uuidlen, u); + type++) + if (memcmp(u, parsed->fhuuid, parsed->uuidlen) == 0) + return true; + + if (memcmp(u, parsed->fhuuid, parsed->uuidlen) != 0) + return false; + return true; + } + /* Well, unreachable, actually: */ + return false; +} + +static void nfsd_fh(FILE *f) +{ + /* request are: + * domain fsidtype fsid + * interpret fsid, find export point and options, and write: + * domain fsidtype fsid expiry path + */ + char *cp; + char *dom; + int fsidtype; + int fsidlen; + char fsid[32]; + struct parsed_fsid parsed; + struct exportent *found = NULL; + struct addrinfo *ai = NULL; + char *found_path = NULL; + nfs_export *exp; + int i; + int dev_missing = 0; + + if (readline(fileno(f), &lbuf, &lbuflen) != 1) + return; + + xlog(D_CALL, "nfsd_fh: inbuf '%s'", lbuf); + + cp = lbuf; + + dom = malloc(strlen(cp)); + if (dom == NULL) + return; + if (qword_get(&cp, dom, strlen(cp)) <= 0) + goto out; + if (qword_get_int(&cp, &fsidtype) != 0) + goto out; + if (fsidtype < 0 || fsidtype > 7) + goto out; /* unknown type */ + if ((fsidlen = qword_get(&cp, fsid, 32)) <= 0) + goto out; + if (parse_fsid(fsidtype, fsidlen, fsid, &parsed)) + goto out; auth_reload(); @@ -480,10 +542,7 @@ static void nfsd_fh(FILE *f) for (i=0 ; i < MCL_MAXTYPES; i++) { nfs_export *next_exp; for (exp = exportlist[i].p_head; exp; exp = next_exp) { - struct stat stb; - char u[16]; char *path; - int type; if (exp->m_export.e_flags & NFSEXP_CROSSMOUNT) { static nfs_export *prev = NULL; @@ -516,50 +575,9 @@ static void nfsd_fh(FILE *f) exp->m_export.e_mountpoint: exp->m_export.e_path)) dev_missing ++; - if (stat(path, &stb) != 0) - continue; - if (!S_ISDIR(stb.st_mode) && !S_ISREG(stb.st_mode)) { + + if (!match_fsid(&parsed, exp, path)) continue; - } - switch(fsidtype){ - case FSID_DEV: - case FSID_MAJOR_MINOR: - case FSID_ENCODE_DEV: - if (stb.st_ino != parsed.inode) - continue; - if (parsed.major != major(stb.st_dev) || - parsed.minor != minor(stb.st_dev)) - continue; - break; - case FSID_NUM: - if (((exp->m_export.e_flags & NFSEXP_FSID) == 0 || - exp->m_export.e_fsid != parsed.fsidnum)) - continue; - break; - case FSID_UUID4_INUM: - case FSID_UUID16_INUM: - if (stb.st_ino != parsed.inode) - continue; - goto check_uuid; - case FSID_UUID8: - case FSID_UUID16: - if (!is_mountpoint(path)) - continue; - check_uuid: - if (exp->m_export.e_uuid) - get_uuid(exp->m_export.e_uuid, - parsed.uuidlen, u); - else - for (type = 0; - uuid_by_path(path, type, parsed.uuidlen, u); - type++) - if (memcmp(u, parsed.fhuuid, parsed.uuidlen) == 0) - break; - - if (memcmp(u, parsed.fhuuid, parsed.uuidlen) != 0) - continue; - break; - } if (use_ipaddr) { if (ai == NULL) { struct addrinfo *tmp; -- 2.39.2