/*
* Internal version of lookup_dt() used by both lookup_dt() and
* update_dt(); same semantics as lookup_dt() except that the `partial'
* argument has been generalized into a `flags' field and the handle has
* been turned into a FILE pointer.
*/
static int
find_dt(FILE *fp, uint_t flags, uint_t query, int count,
const dt_rec_t *targetp, dt_rec_list_t **recordsp, uint_t *nrecordsp)
{
int retval = DSVC_SUCCESS;
char *buf = NULL, *fields[DTF_MAX_FIELDS];
uint_t nrecords;
dt_rec_t *recordp;
dt_rec_list_t *records, *new_records;
unsigned int nfields;
off_t recoff;
if (fseek(fp, 0, SEEK_SET) == -1)
return (DSVC_INTERNAL);
records = NULL;
for (nrecords = 0; count < 0 || nrecords < count; ) {
free(buf);
if (flags & FIND_POSITION)
recoff = ftello(fp);
buf = read_entry(fp);
if (buf == NULL) {
if (!feof(fp))
retval = DSVC_NO_MEMORY;
break;
}
/*
* Skip pure comment lines; for now this just skips the
* header information at the top of the container.
*/
if (buf[0] == DTF_COMMENT_CHAR)
continue;
/*
* Parse out the entry into the dt_rec_t
*/
nfields = field_split(buf, DTF_MAX_FIELDS, fields, " \t");
if (nfields < DTF_MAX_FIELDS)
continue;
/*
* See if we've got a match. If so, allocate the new
* record, fill it in, and continue.
*/
if (DSVC_QISEQ(query, DT_QTYPE) &&
targetp->dt_type != fields[DTF_TYPE][0])
continue;
else if (DSVC_QISNEQ(query, DT_QTYPE) &&
targetp->dt_type == fields[DTF_TYPE][0])
continue;
if (DSVC_QISEQ(query, DT_QKEY) &&
strcmp(targetp->dt_key, fields[DTF_KEY]) != 0)
continue;
else if (DSVC_QISNEQ(query, DT_QKEY) &&
strcmp(targetp->dt_key, fields[DTF_KEY]) == 0)
continue;
/*
* Caller just wants a count of the number of matching
* records, not the records themselves; continue.
*/
if (recordsp == NULL) {
nrecords++;
continue;
}
/*
* Allocate record; if FIND_POSITION flag is set, then we
* need to allocate an extended (dt_recpos_t) record.
*/
if (flags & FIND_POSITION)
recordp = malloc(sizeof (dt_recpos_t));
else
recordp = malloc(sizeof (dt_rec_t));
if (recordp == NULL) {
if ((flags & FIND_PARTIAL) == 0)
retval = DSVC_NO_MEMORY;
break;
}
/*
* Fill in record; if FIND_POSITION flag is set, then pass
* back additional location information.
*/
(void) strlcpy(recordp->dt_key, fields[DTF_KEY],
sizeof (recordp->dt_key));
recordp->dt_sig = 1;
recordp->dt_type = fields[DTF_TYPE][0];
recordp->dt_value = strdup(fields[DTF_VALUE]);
if (recordp->dt_value == NULL) {
free(recordp);
if ((flags & FIND_PARTIAL) == 0)
retval = DSVC_NO_MEMORY;
break;
}
if (flags & FIND_POSITION) {
((dt_recpos_t *)recordp)->dtp_off = recoff;
((dt_recpos_t *)recordp)->dtp_size = ftello(fp) -
recoff;
}
/*
* Chuck the record on the list; up the counter.
*/
new_records = add_dtrec_to_list(recordp, records);
if (new_records == NULL) {
free_dtrec(recordp);
if ((flags & FIND_PARTIAL) == 0)
retval = DSVC_NO_MEMORY;
break;
}
records = new_records;
nrecords++;
}
free(buf);
if (retval == DSVC_SUCCESS) {
*nrecordsp = nrecords;
if (recordsp != NULL)
*recordsp = records;
return (DSVC_SUCCESS);
}
if (records != NULL)
free_dtrec_list(records);
return (retval);
}
/*
* Internal version lookup routine used by both lookup_dn() and
* update_dn(); same semantics as lookup_dn() except that the `partial'
* argument has been generalized into a `flags' field.
*/
static int
find_dn(int fd, uint_t flags, uint_t query, int count, const dn_rec_t *targetp,
dn_rec_list_t **recordsp, uint_t *nrecordsp)
{
int retval = DSVC_SUCCESS;
char *fields[DNF_FIELDS];
uint_t nrecords;
dn_rec_t dn, *recordp;
dn_rec_list_t *records, *new_records;
unsigned int nfields;
struct stat st;
struct in_addr cip_nbo;
char *ent0, *ent, *entend;
char cip[INET_ADDRSTRLEN + 2];
/*
* Page the whole container into memory via mmap() so we can scan it
* quickly; map it MAP_PRIVATE so that we can change newlines to
* NULs without changing the actual container itself.
*/
if (fstat(fd, &st) == -1 || st.st_size < 1)
return (DSVC_INTERNAL);
ent0 = mmap(0, st.st_size, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0);
if (ent0 == MAP_FAILED)
return (DSVC_INTERNAL);
/*
* NUL-terminate the last byte (which should be a newline) so that
* we can safely use string functions on the mapped container.
*/
ent0[st.st_size - 1] = '\0';
/*
* If we're searching by client IP address, then build a target
* string we can use to find it quickly.
*/
if (DSVC_QISEQ(query, DN_QCIP)) {
cip[0] = '\n';
cip_nbo.s_addr = htonl(targetp->dn_cip.s_addr);
(void) inet_ntop(AF_INET, &cip_nbo, cip + 1, INET_ADDRSTRLEN);
(void) strlcat(cip, "|", sizeof (cip));
}
records = NULL;
ent = ent0;
for (nrecords = 0; count < 0 || nrecords < count; ent = entend + 1) {
/*
* Bail if we've reached the end of the container.
*/
if (ent - ent0 >= st.st_size)
break;
/*
* If we're searching by client IP address, locate it
* quickly using strstr(3C); if we can't find it by this
* technique then it's not in the container.
*/
if (DSVC_QISEQ(query, DN_QCIP)) {
/*
* If we've already found the DN_QCIP record, bail.
*/
if (nrecords > 0)
break;
ent = strstr(ent, cip);
if (ent == NULL)
break;
ent++;
}
/*
* Find the end of the record and change it a NUL byte so
* that it is interpreted correctly with field_split() and
* record_match() below. If we can't find a trailing
* newline, then it must be the last record (whose newline
* we already changed to a NUL above).
*/
entend = strchr(ent, '\n');
if (entend != NULL)
*entend = '\0';
else
entend = &ent0[st.st_size - 1];
/*
* Skip pure comment lines; for now this just skips the
* header information at the top of the container.
*/
if (ent[0] == DNF_COMMENT_CHAR)
continue;
/*
* Split the buffer up into DNF_FIELDS fields.
*/
nfields = field_split(ent, DNF_FIELDS, fields, "|");
if (nfields < DNF_FIELDS)
continue;
/*
* See if we've got a match, filling in dnf.dnf_rec as
* we go. If record_match() succeeds, dnf.dnf_rec will
* be completely filled in.
*/
if (!record_match(fields, &dn, targetp, query))
continue;
/*
* Caller just wants a count of the number of matching
* records, not the records themselves; continue.
*/
if (recordsp == NULL) {
nrecords++;
continue;
}
/*
* Allocate record; if FIND_POSITION flag is set, then
* we need to allocate an extended (dn_recpos_t) record.
*/
if (flags & FIND_POSITION)
recordp = malloc(sizeof (dn_recpos_t));
else
recordp = malloc(sizeof (dn_rec_t));
if (recordp == NULL) {
if ((flags & FIND_PARTIAL) == 0)
retval = DSVC_NO_MEMORY;
break;
}
/*
* Fill in record; do a structure copy from our automatic
* dn. If FIND_POSITION flag is on, pass back additional
* position information.
*/
*recordp = dn;
if (flags & FIND_POSITION) {
((dn_recpos_t *)recordp)->dnp_off = ent - ent0;
((dn_recpos_t *)recordp)->dnp_size = entend - ent + 1;
}
/*
* Chuck the record on the list; up the counter.
*/
new_records = add_dnrec_to_list(recordp, records);
if (new_records == NULL) {
free(recordp);
if ((flags & FIND_PARTIAL) == 0)
retval = DSVC_NO_MEMORY;
break;
}
records = new_records;
nrecords++;
}
(void) munmap(ent0, st.st_size);
if (retval == DSVC_SUCCESS) {
*nrecordsp = nrecords;
if (recordsp != NULL)
*recordsp = records;
return (DSVC_SUCCESS);
}
if (records != NULL)
free_dnrec_list(records);
return (retval);
}
