%{
#include <sys/types.h>
#include <sys/queue.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/uio.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <event.h>
#include <limits.h>
#include <netdb.h>
#include <stdarg.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <scsi/iscsi.h>
#include "iscsid.h"
#include "iscsictl.h"
TAILQ_HEAD(files, file) files = TAILQ_HEAD_INITIALIZER(files);
static struct file {
TAILQ_ENTRY(file) entry;
FILE *stream;
char *name;
size_t ungetpos;
size_t ungetsize;
u_char *ungetbuf;
int eof_reached;
int lineno;
int errors;
} *file, *topfile;
struct file *pushfile(const char *, int);
int popfile(void);
int yyparse(void);
int yylex(void);
int yyerror(const char *, ...)
__attribute__((__format__ (printf, 1, 2)))
__attribute__((__nonnull__ (1)));
int kw_cmp(const void *, const void *);
int lookup(char *);
int igetc(void);
int lgetc(int);
void lungetc(int);
int findeol(void);
void clear_config(struct iscsi_config *);
TAILQ_HEAD(symhead, sym) symhead = TAILQ_HEAD_INITIALIZER(symhead);
struct sym {
TAILQ_ENTRY(sym) entry;
int used;
int persist;
char *nam;
char *val;
};
int symset(const char *, const char *, int);
char *symget(const char *);
static int errors;
static struct iscsi_config *conf;
static struct session_config *session;
struct addrinfo_opts {
int af;
char *port;
} addrinfo_opts;
typedef struct {
union {
int i;
int64_t number;
char *string;
struct addrinfo_opts addrinfo_opts;
struct addrinfo *addrinfo;
} v;
int lineno;
} YYSTYPE;
%}
%token TARGET TARGETNAME TARGETADDR
%token INITIATORNAME INITIATORADDR ISID
%token ENABLED DISABLED NORMAL DISCOVERY
%token ADDRESS INET INET6 PORT
%token INCLUDE
%token ERROR
%token <v.string> STRING
%token <v.number> NUMBER
%type <v.i> af state type
%type <v.string> port
%type <v.addrinfo> addrinfo
%type <v.addrinfo_opts> addrinfo_opts addrinfo_opts_l addrinfo_opt
%type <v.string> string
%%
grammar :
| grammar '\n'
| grammar include '\n'
| grammar varset '\n'
| grammar initiator '\n'
| grammar target '\n'
| grammar error '\n' { file->errors++; }
;
include : INCLUDE STRING {
struct file *nfile;
if ((nfile = pushfile($2, 1)) == NULL) {
yyerror("failed to include file %s", $2);
free($2);
YYERROR;
}
free($2);
file = nfile;
lungetc('\n');
}
;
string : string STRING {
if (asprintf(&$$, "%s %s", $1, $2) == -1) {
free($1);
free($2);
yyerror("string: asprintf");
YYERROR;
}
free($1);
free($2);
}
| STRING
;
varset : STRING '=' string {
char *s = $1;
while (*s++) {
if (isspace((unsigned char)*s)) {
yyerror("macro name cannot contain "
"whitespace");
free($1);
free($3);
YYERROR;
}
}
if (symset($1, $3, 0) == -1)
err(1, "cannot store variable");
free($1);
free($3);
}
;
optnl : '\n' optnl
|
;
nl : '\n' optnl
;
initiator : ISID STRING NUMBER NUMBER {
u_int32_t mask1, mask2;
if (!strcasecmp($2, "oui")) {
conf->initiator.isid_base = ISCSI_ISID_OUI;
mask1 = 0x3fffff00;
mask2 = 0x000000ff;
} else if (!strcasecmp($2, "en")) {
conf->initiator.isid_base = ISCSI_ISID_EN;
mask1 = 0x00ffffff;
mask2 = 0;
} else if (!strcasecmp($2, "rand")) {
conf->initiator.isid_base = ISCSI_ISID_RAND;
mask1 = 0x00ffffff;
mask2 = 0;
} else {
yyerror("isid type %s unknown", $2);
free($2);
YYERROR;
}
free($2);
conf->initiator.isid_base |= $3 & mask1;
conf->initiator.isid_base |= ($4 >> 16) & mask2;
conf->initiator.isid_qual = $4;
}
;
target : TARGET STRING {
struct session_ctlcfg *scelm;
scelm = calloc(1, sizeof(*scelm));
session = &scelm->session;
if (strlcpy(session->SessionName, $2,
sizeof(session->SessionName)) >=
sizeof(session->SessionName)) {
yyerror("target name \"%s\" too long", $2);
free($2);
free(scelm);
YYERROR;
}
free($2);
SIMPLEQ_INSERT_TAIL(&conf->sessions, scelm, entry);
} '{' optnl targetopts_l '}'
;
targetopts_l : targetopts_l targetoptsl nl
| targetoptsl optnl
;
targetoptsl : state { session->disabled = $1; }
| type { session->SessionType = $1; }
| TARGETNAME STRING { session->TargetName = $2; }
| INITIATORNAME STRING { session->InitiatorName = $2; }
| TARGETADDR addrinfo {
bcopy($2->ai_addr, &session->connection.TargetAddr,
$2->ai_addr->sa_len);
freeaddrinfo($2);
}
| INITIATORADDR addrinfo {
((struct sockaddr_in *)$2->ai_addr)->sin_port = 0;
bcopy($2->ai_addr, &session->connection.LocalAddr,
$2->ai_addr->sa_len);
freeaddrinfo($2);
}
;
addrinfo : STRING addrinfo_opts {
struct addrinfo hints;
char *hostname;
int error;
$$ = NULL;
if ($2.port == NULL) {
if (($2.port = strdup("iscsi")) == NULL) {
free($1);
yyerror("port strdup");
YYERROR;
}
}
memset(&hints, 0, sizeof(hints));
hints.ai_family = $2.af;
hints.ai_socktype = SOCK_STREAM;
hints.ai_protocol = IPPROTO_TCP;
if (strcmp($1, "*") == 0) {
hostname = NULL;
hints.ai_flags = AI_PASSIVE;
} else
hostname = $1;
error = getaddrinfo(hostname, $2.port, &hints, &$$);
if (error) {
yyerror("%s (%s %s)", gai_strerror(error),
$1, $2.port);
free($1);
free($2.port);
YYERROR;
}
free($1);
free($2.port);
}
;
addrinfo_opts : {
addrinfo_opts.port = NULL;
addrinfo_opts.af = PF_UNSPEC;
}
addrinfo_opts_l { $$ = addrinfo_opts; }
| {
addrinfo_opts.port = NULL;
addrinfo_opts.af = PF_UNSPEC;
$$ = addrinfo_opts;
}
;
addrinfo_opts_l : addrinfo_opts_l addrinfo_opt
| addrinfo_opt
;
addrinfo_opt : port {
if (addrinfo_opts.port != NULL) {
yyerror("port cannot be redefined");
YYERROR;
}
addrinfo_opts.port = $1;
}
| af {
if (addrinfo_opts.af != PF_UNSPEC) {
yyerror("address family cannot be redefined");
YYERROR;
}
addrinfo_opts.af = $1;
}
;
port : PORT STRING { $$ = $2; }
;
af : INET { $$ = PF_INET; }
| INET6 { $$ = PF_INET6; }
;
state : ENABLED { $$ = 0; }
| DISABLED { $$ = 1; }
;
type : NORMAL { $$ = SESSION_TYPE_NORMAL; }
| DISCOVERY { $$ = SESSION_TYPE_DISCOVERY; }
;
%%
struct keywords {
const char *k_name;
int k_val;
};
int
yyerror(const char *fmt, ...)
{
va_list ap;
file->errors++;
va_start(ap, fmt);
fprintf(stderr, "%s:%d: ", file->name, yylval.lineno);
vfprintf(stderr, fmt, ap);
fprintf(stderr, "\n");
va_end(ap);
return (0);
}
int
kw_cmp(const void *k, const void *e)
{
return (strcmp(k, ((const struct keywords *)e)->k_name));
}
int
lookup(char *s)
{
static const struct keywords keywords[] = {
{"address", ADDRESS},
{"disabled", DISABLED},
{"discovery", DISCOVERY},
{"enabled", ENABLED},
{"include", INCLUDE},
{"inet", INET},
{"inet4", INET},
{"inet6", INET6},
{"initiatoraddr", INITIATORADDR},
{"initiatorname", INITIATORNAME},
{"isid", ISID},
{"normal", NORMAL},
{"port", PORT},
{"target", TARGET},
{"targetaddr", TARGETADDR},
{"targetname", TARGETNAME}
};
const struct keywords *p;
p = bsearch(s, keywords, sizeof(keywords)/sizeof(keywords[0]),
sizeof(keywords[0]), kw_cmp);
if (p)
return (p->k_val);
else
return (STRING);
}
#define START_EXPAND 1
#define DONE_EXPAND 2
static int expanding;
int
igetc(void)
{
int c;
while (1) {
if (file->ungetpos > 0)
c = file->ungetbuf[--file->ungetpos];
else
c = getc(file->stream);
if (c == START_EXPAND)
expanding = 1;
else if (c == DONE_EXPAND)
expanding = 0;
else
break;
}
return (c);
}
int
lgetc(int quotec)
{
int c, next;
if (quotec) {
if ((c = igetc()) == EOF) {
yyerror("reached end of file while parsing "
"quoted string");
if (file == topfile || popfile() == EOF)
return (EOF);
return (quotec);
}
return (c);
}
while ((c = igetc()) == '\\') {
next = igetc();
if (next != '\n') {
c = next;
break;
}
yylval.lineno = file->lineno;
file->lineno++;
}
while (c == EOF) {
if (file == topfile || popfile() == EOF)
return (EOF);
c = getc(file->stream);
}
return (c);
}
void
lungetc(int c)
{
if (c == EOF)
return;
if (file->ungetpos >= file->ungetsize) {
void *p = reallocarray(file->ungetbuf, file->ungetsize, 2);
if (p == NULL)
err(1, "%s", __func__);
file->ungetbuf = p;
file->ungetsize *= 2;
}
file->ungetbuf[file->ungetpos++] = c;
}
int
findeol(void)
{
int c;
while (1) {
c = lgetc(0);
if (c == '\n') {
file->lineno++;
break;
}
if (c == EOF)
break;
}
return (ERROR);
}
int
yylex(void)
{
char buf[8096];
char *p, *val;
int quotec, next, c;
int token;
top:
p = buf;
while ((c = lgetc(0)) == ' ' || c == '\t')
;
yylval.lineno = file->lineno;
if (c == '#')
while ((c = lgetc(0)) != '\n' && c != EOF)
;
if (c == '$' && !expanding) {
while (1) {
if ((c = lgetc(0)) == EOF)
return (0);
if (p + 1 >= buf + sizeof(buf) - 1) {
yyerror("string too long");
return (findeol());
}
if (isalnum(c) || c == '_') {
*p++ = c;
continue;
}
*p = '\0';
lungetc(c);
break;
}
val = symget(buf);
if (val == NULL) {
yyerror("macro '%s' not defined", buf);
return (findeol());
}
p = val + strlen(val) - 1;
lungetc(DONE_EXPAND);
while (p >= val) {
lungetc((unsigned char)*p);
p--;
}
lungetc(START_EXPAND);
goto top;
}
switch (c) {
case '\'':
case '"':
quotec = c;
while (1) {
if ((c = lgetc(quotec)) == EOF)
return (0);
if (c == '\n') {
file->lineno++;
continue;
} else if (c == '\\') {
if ((next = lgetc(quotec)) == EOF)
return (0);
if (next == quotec || next == ' ' ||
next == '\t')
c = next;
else if (next == '\n') {
file->lineno++;
continue;
} else
lungetc(next);
} else if (c == quotec) {
*p = '\0';
break;
} else if (c == '\0') {
yyerror("syntax error");
return (findeol());
}
if (p + 1 >= buf + sizeof(buf) - 1) {
yyerror("string too long");
return (findeol());
}
*p++ = c;
}
yylval.v.string = strdup(buf);
if (yylval.v.string == NULL)
err(1, "%s", __func__);
return (STRING);
}
#define allowed_to_end_number(x) \
(isspace(x) || x == ')' || x ==',' || x == '/' || x == '}' || x == '=')
if (c == '-' || isdigit(c)) {
do {
*p++ = c;
if ((size_t)(p-buf) >= sizeof(buf)) {
yyerror("string too long");
return (findeol());
}
} while ((c = lgetc(0)) != EOF && isdigit(c));
lungetc(c);
if (p == buf + 1 && buf[0] == '-')
goto nodigits;
if (c == EOF || allowed_to_end_number(c)) {
const char *errstr = NULL;
*p = '\0';
yylval.v.number = strtonum(buf, LLONG_MIN,
LLONG_MAX, &errstr);
if (errstr) {
yyerror("\"%s\" invalid number: %s",
buf, errstr);
return (findeol());
}
return (NUMBER);
} else {
nodigits:
while (p > buf + 1)
lungetc((unsigned char)*--p);
c = (unsigned char)*--p;
if (c == '-')
return (c);
}
}
#define allowed_in_string(x) \
(isalnum(x) || (ispunct(x) && x != '(' && x != ')' && \
x != '{' && x != '}' && \
x != '!' && x != '=' && x != '#' && \
x != ','))
if (isalnum(c) || c == ':' || c == '_') {
do {
*p++ = c;
if ((size_t)(p-buf) >= sizeof(buf)) {
yyerror("string too long");
return (findeol());
}
} while ((c = lgetc(0)) != EOF && (allowed_in_string(c)));
lungetc(c);
*p = '\0';
if ((token = lookup(buf)) == STRING)
if ((yylval.v.string = strdup(buf)) == NULL)
err(1, "%s", __func__);
return (token);
}
if (c == '\n') {
yylval.lineno = file->lineno;
file->lineno++;
}
if (c == EOF)
return (0);
return (c);
}
struct file *
pushfile(const char *name, int secret)
{
struct file *nfile;
if ((nfile = calloc(1, sizeof(struct file))) == NULL) {
warn("%s", __func__);
return (NULL);
}
if ((nfile->name = strdup(name)) == NULL) {
warn("%s", __func__);
free(nfile);
return (NULL);
}
if ((nfile->stream = fopen(nfile->name, "r")) == NULL) {
warn("%s: %s", __func__, nfile->name);
free(nfile->name);
free(nfile);
return (NULL);
}
nfile->lineno = TAILQ_EMPTY(&files) ? 1 : 0;
nfile->ungetsize = 16;
nfile->ungetbuf = malloc(nfile->ungetsize);
if (nfile->ungetbuf == NULL) {
warn("%s", __func__);
fclose(nfile->stream);
free(nfile->name);
free(nfile);
return (NULL);
}
TAILQ_INSERT_TAIL(&files, nfile, entry);
return (nfile);
}
int
popfile(void)
{
struct file *prev;
if ((prev = TAILQ_PREV(file, files, entry)) != NULL)
prev->errors += file->errors;
TAILQ_REMOVE(&files, file, entry);
fclose(file->stream);
free(file->name);
free(file->ungetbuf);
free(file);
file = prev;
return (file ? 0 : EOF);
}
struct iscsi_config *
parse_config(char *filename)
{
struct sym *sym, *next;
file = pushfile(filename, 1);
if (file == NULL)
return (NULL);
topfile = file;
conf = calloc(1, sizeof(struct iscsi_config));
if (conf == NULL)
return (NULL);
SIMPLEQ_INIT(&conf->sessions);
yyparse();
errors = file->errors;
popfile();
TAILQ_FOREACH_SAFE(sym, &symhead, entry, next) {
if (!sym->persist) {
free(sym->nam);
free(sym->val);
TAILQ_REMOVE(&symhead, sym, entry);
free(sym);
}
}
if (errors) {
clear_config(conf);
return (NULL);
}
return (conf);
}
int
cmdline_symset(char *s)
{
char *sym, *val;
int ret;
if ((val = strrchr(s, '=')) == NULL)
return (-1);
sym = strndup(s, val - s);
if (sym == NULL)
errx(1, "%s: strndup", __func__);
ret = symset(sym, val + 1, 1);
free(sym);
return (ret);
}
char *
symget(const char *nam)
{
struct sym *sym;
TAILQ_FOREACH(sym, &symhead, entry) {
if (strcmp(nam, sym->nam) == 0) {
sym->used = 1;
return (sym->val);
}
}
return (NULL);
}
int
symset(const char *nam, const char *val, int persist)
{
struct sym *sym;
TAILQ_FOREACH(sym, &symhead, entry) {
if (strcmp(nam, sym->nam) == 0)
break;
}
if (sym != NULL) {
if (sym->persist == 1)
return (0);
else {
free(sym->nam);
free(sym->val);
TAILQ_REMOVE(&symhead, sym, entry);
free(sym);
}
}
if ((sym = calloc(1, sizeof(*sym))) == NULL)
return (-1);
sym->nam = strdup(nam);
if (sym->nam == NULL) {
free(sym);
return (-1);
}
sym->val = strdup(val);
if (sym->val == NULL) {
free(sym->nam);
free(sym);
return (-1);
}
sym->used = 0;
sym->persist = persist;
TAILQ_INSERT_TAIL(&symhead, sym, entry);
return (0);
}
void
clear_config(struct iscsi_config *c)
{
struct session_ctlcfg *s;
while ((s = SIMPLEQ_FIRST(&c->sessions))) {
SIMPLEQ_REMOVE_HEAD(&c->sessions, entry);
free(s->session.TargetName);
free(s->session.InitiatorName);
free(s);
}
free(c);
}
