[secnet] / util.c

/* $Log: util.c,v $
 * Revision 1.2  1996/04/14 16:34:36  sde1000
 * Added syslog support
 * mpbin/mpstring functions moved from dh.c
 *
 * Revision 1.1  1996/03/14 17:05:03  sde1000
 * Initial revision
 *
 */

#include "secnet.h"
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <limits.h>
#include <assert.h>
#include <sys/wait.h>
#include "util.h"
#include "unaligned.h"

#define MIN_BUFFER_SIZE 64
#define DEFAULT_BUFFER_SIZE 4096
#define MAX_BUFFER_SIZE 131072

static char *hexdigits="0123456789abcdef";

uint32_t message_level=M_WARNING|M_ERROR|M_FATAL;
uint32_t syslog_level=M_WARNING|M_ERROR|M_FATAL;
static uint32_t current_phase=0;

struct phase_hook {
    hook_fn *fn;
    void *state;
    struct phase_hook *next;
};

static struct phase_hook *hooks[NR_PHASES]={NULL,};

static void vMessage(uint32_t class, char *message, va_list args)
{
    FILE *dest=stdout;
    if (class & message_level) {
	if (class&M_FATAL || class&M_ERROR || class&M_WARNING) {
	    dest=stderr;
	}
	vfprintf(dest,message,args);
    }
/* XXX do something about syslog output here */
#if 0
    /* Maybe send message to syslog */
    vsprintf(buff, message, args);
    /* XXX Send each line as a separate log entry */
    log(syslog_prio[level], buff);
#endif /* 0 */
}  

void Message(uint32_t class, char *message, ...)
{
    va_list ap;

    va_start(ap,message);

    vMessage(class,message,ap);

    va_end(ap);
}

static void vfatal(int status, bool_t perror, char *message, va_list args)
{
    int err;

    err=errno;

    enter_phase(PHASE_SHUTDOWN);
    if (perror) {
	Message(M_FATAL, "secnet fatal error: ");
	vMessage(M_FATAL, message, args);
	Message(M_FATAL, ": %s\n",strerror(err));
    }
    else {
	Message(M_FATAL, "secnet fatal error: ");
	vMessage(M_FATAL,message,args);
    }
    exit(status);
}

void fatal(char *message, ...)
{
    va_list args;
    va_start(args,message);
    vfatal(current_phase,False,message,args);
    va_end(args);
}

void fatal_status(int status, char *message, ...)
{
    va_list args;
    va_start(args,message);
    vfatal(status,False,message,args);
    va_end(args);
}

void fatal_perror(char *message, ...)
{
    va_list args;
    va_start(args,message);
    vfatal(current_phase,True,message,args);
    va_end(args);
}

void fatal_perror_status(int status, char *message, ...)
{
    va_list args;
    va_start(args,message);
    vfatal(status,True,message,args);
    va_end(args);
}

void cfgfatal(struct cloc loc, string_t facility, char *message, ...)
{
    va_list args;

    va_start(args,message);

    enter_phase(PHASE_SHUTDOWN);

    if (loc.file && loc.line) {
	Message(M_FATAL, "config error (%s, %s:%d): ",facility,loc.file,
		loc.line);
    } else if (!loc.file && loc.line) {
	Message(M_FATAL, "config error (%s, line %d): ",facility,loc.line);
    } else {
	Message(M_FATAL, "config error (%s): ",facility);
    }
    
    vMessage(M_FATAL,message,args);
    va_end(args);
    exit(current_phase);
}

char *safe_strdup(char *s, char *message)
{
    char *d;
    d=strdup(s);
    if (!d) {
	fatal_perror(message);
    }
    return d;
}

void *safe_malloc(size_t size, char *message)
{
    void *r;
    r=malloc(size);
    if (!r) {
	fatal_perror(message);
    }
    return r;
}

/* Convert a buffer into its MP_INT representation */
void read_mpbin(MP_INT *a, uint8_t *bin, int binsize)
{
    char *buff;
    int i;

    buff=safe_malloc(binsize*2 + 1,"read_mpbin");

    for (i=0; i<binsize; i++) {
	buff[i*2]=hexdigits[(bin[i] & 0xf0) >> 4];
	buff[i*2+1]=hexdigits[(bin[i] & 0xf)];
    }
    buff[binsize*2]=0;

    mpz_set_str(a, buff, 16);
    free(buff);
}

/* Convert a MP_INT into a hex string */
char *write_mpstring(MP_INT *a)
{
    char *buff;

    buff=safe_malloc(mpz_sizeinbase(a,16)+2,"write_mpstring");
    mpz_get_str(buff, 16, a);
    return buff;
}

static uint8_t hexval(uint8_t c)
{
    switch (c) {
    case '0': return 0;
    case '1': return 1;
    case '2': return 2;
    case '3': return 3;
    case '4': return 4;
    case '5': return 5;
    case '6': return 6;
    case '7': return 7;
    case '8': return 8;
    case '9': return 9;
    case 'a': return 10;
    case 'A': return 10;
    case 'b': return 11;
    case 'B': return 11;
    case 'c': return 12;
    case 'C': return 12;
    case 'd': return 13;
    case 'D': return 13;
    case 'e': return 14;
    case 'E': return 14;
    case 'f': return 15;
    case 'F': return 15;
    }
    return -1;
}

/* Convert a MP_INT into a buffer; return length; truncate if necessary */
uint32_t write_mpbin(MP_INT *a, uint8_t *buffer, uint32_t buflen)
{
    char *hb;
    int i,j,l;
    
    if (buflen==0) return 0;
    hb=write_mpstring(a);
    
    l=strlen(hb);
    i=0; j=0;
    if (l&1) {
	/* The number starts with a half-byte */
	buffer[i++]=hexval(hb[j++]);
    }
    for (; hb[j] && i<buflen; i++) {
	buffer[i]=(hexval(hb[j])<<4)|hexval(hb[j+1]);
	j+=2;
    }
    free(hb);
    return i;
}

bool_t subnet_match(struct subnet_list *list, uint32_t address)
{
    uint32_t i;
    for (i=0; i<list->entries; i++) {
	if (list->list[i].prefix == (address&list->list[i].mask)) return True;
    }
    return False;
}

bool_t subnets_intersect(struct subnet a, struct subnet b)
{
    uint32_t mask=a.mask&b.mask;
    return ((a.prefix&mask)==(b.prefix&mask));
}

bool_t subnet_intersects_with_list(struct subnet a, struct subnet_list *b)
{
    uint32_t i;

    for (i=0; i<b->entries; i++) {
	if (subnets_intersect(a,b->list[i])) return True;
    }
    return False;
}

bool_t subnet_lists_intersect(struct subnet_list *a, struct subnet_list *b)
{
    uint32_t i;
    for (i=0; i<a->entries; i++) {
	if (subnet_intersects_with_list(a->list[i],b)) return True;
    }
    return False;
}

/* The string buffer must be at least 16 bytes long */
string_t ipaddr_to_string(uint32_t addr)
{
    uint8_t a,b,c,d;
    string_t s;

    s=safe_malloc(16,"ipaddr_to_string");
    a=addr>>24;
    b=addr>>16;
    c=addr>>8;
    d=addr;
    snprintf(s, 16, "%d.%d.%d.%d", a, b, c, d);
    return s;
}

string_t subnet_to_string(struct subnet *sn)
{
    uint32_t mask=sn->mask, addr=sn->prefix;
    uint8_t a,b,c,d;
    string_t s;
    int i;

    s=safe_malloc(19,"subnet_to_string");
    a=addr>>24;
    b=addr>>16;
    c=addr>>8;
    d=addr;
    for (i=0; mask; i++) {
	mask=(mask<<1);
    }
    snprintf(s, 19, "%d.%d.%d.%d/%d", a, b, c, d, i);
    return s;
}

int sys_cmd(const char *path, char *arg, ...)
{
    va_list ap;
    int rv;
    pid_t c;

    va_start(ap,arg);
    c=fork();
    if (c) {
	/* Parent -> wait for child */
	waitpid(c,&rv,0);
    } else if (c==0) {
	char *args[100];
	int i;
	/* Child -> exec command */
	args[0]=arg;
	i=1;
	while ((args[i++]=va_arg(ap,char *)));
	execvp(path,args);
	exit(1);
    } else {
	/* Error */
	fatal_perror("sys_cmd(%s,%s,...)");
    }

    va_end(ap);
    return rv;
}

/* Take a list of log closures and merge them */
struct loglist {
    struct log_if *l;
    struct loglist *next;
};

static void log_vmulti(void *state, int priority, char *message, va_list args)
{
    struct loglist *st=state, *i;

    for (i=st; i; i=i->next) {
	i->l->vlog(i->l->st,priority,message,args);
    }
}

static void log_multi(void *st, int priority, char *message, ...)
{
    va_list ap;

    va_start(ap,message);

    log_vmulti(st,priority,message,ap);

    va_end(ap);
}

struct log_if *init_log(list_t *ll)
{
    int i=0;
    item_t *item;
    closure_t *cl;
    struct loglist *l=NULL, *n;
    struct log_if *r;

    while ((item=list_elem(ll,i++))) {
	if (item->type!=t_closure) {
	    cfgfatal(item->loc,"init_log","item is not a closure");
	}
	cl=item->data.closure;
	if (cl->type!=CL_LOG) {
	    cfgfatal(item->loc,"init_log","closure is not a logger");
	}
	n=safe_malloc(sizeof(*n),"init_log");
	n->l=cl->interface;
	n->next=l;
	l=n;
    }
    if (!l) {
	fatal("init_log: none of the items in the list are loggers");
    }
    r=safe_malloc(sizeof(*r), "init_log");
    r->st=l;
    r->log=log_multi;
    r->vlog=log_vmulti;
    return r;
}

struct logfile {
    closure_t cl;
    struct log_if ops;
    FILE *f;
};

static void logfile_vlog(void *state, int priority, char *message,
			 va_list args)
{
    struct logfile *st=state;

    vfprintf(st->f,message,args);
    fprintf(st->f,"\n");
}

static void logfile_log(void *state, int priority, char *message, ...)
{
    va_list ap;

    va_start(ap,message);
    logfile_vlog(state,priority,message,ap);
    va_end(ap);
}

static list_t *logfile_apply(closure_t *self, struct cloc loc, dict_t *context,
			     list_t *data)
{
    struct logfile *st;
    
    st=safe_malloc(sizeof(*st),"logfile_apply");
    st->cl.description="logfile";
    st->cl.type=CL_LOG;
    st->cl.apply=NULL;
    st->cl.interface=&st->ops;
    st->ops.st=st;
    st->ops.log=logfile_log;
    st->ops.vlog=logfile_vlog;
    st->f=stderr; /* XXX ignore args */

    return new_closure(&st->cl);
}
	
static char *phases[NR_PHASES]={
    "PHASE_INIT",
    "PHASE_GETOPTS",
    "PHASE_READCONFIG",
    "PHASE_SETUP",
    "PHASE_GETRESOURCES",
    "PHASE_DROPPRIV",
    "PHASE_RUN",
    "PHASE_SHUTDOWN"
};

void enter_phase(uint32_t new_phase)
{
    struct phase_hook *i;

    if (hooks[new_phase])
	Message(M_DEBUG_PHASE,"Running hooks for %s...\n", phases[new_phase]);
    current_phase=new_phase;

    for (i=hooks[new_phase]; i; i=i->next)
	i->fn(i->state, new_phase);
    Message(M_DEBUG_PHASE,"Now in %s\n",phases[new_phase]);
}

bool_t add_hook(uint32_t phase, hook_fn *fn, void *state)
{
    struct phase_hook *h;

    h=safe_malloc(sizeof(*h),"add_hook");
    h->fn=fn;
    h->state=state;
    h->next=hooks[phase];
    hooks[phase]=h;
    return True;
}

bool_t remove_hook(uint32_t phase, hook_fn *fn, void *state)
{
    fatal("remove_hook: not implemented\n");

    return False;
}

void log(struct log_if *lf, int priority, char *message, ...)
{
    va_list ap;
    
    va_start(ap,message);
    lf->vlog(lf->st,priority,message,ap);
    va_end(ap);
}

struct buffer {
    closure_t cl;
    struct buffer_if ops;
};

void buffer_assert_free(struct buffer_if *buffer, string_t file, uint32_t line)
{
    if (!buffer->free) {
	fatal("BUF_ASSERT_FREE, %s line %d, owned by %s\n",
	      file,line,buffer->owner);
    }
}

void buffer_assert_used(struct buffer_if *buffer, string_t file, uint32_t line)
{
    if (buffer->free) {
	fatal("BUF_ASSERT_USED, %s line %d, last owned by %s\n",
	      file,line,buffer->owner);
    }
}

void buffer_init(struct buffer_if *buffer, uint32_t max_start_pad)
{
    buffer->start=buffer->base+max_start_pad;
    buffer->size=0;
}

void *buf_append(struct buffer_if *buf, uint32_t amount) {
    void *p;
    p=buf->start + buf->size;
    buf->size+=amount;
    return p;
}

void *buf_prepend(struct buffer_if *buf, uint32_t amount) {
    buf->size+=amount;
    return buf->start-=amount;
}

void *buf_unappend(struct buffer_if *buf, uint32_t amount) {
    if (buf->size < amount) return 0;
    return buf->start+(buf->size-=amount);
}

void *buf_unprepend(struct buffer_if *buf, uint32_t amount) {
    void *p;
    p=buf->start;
    buf->start+=amount;
    buf->size-=amount;
    return p;
}

/* Append a two-byte length and the string to the buffer. Length is in
   network byte order. */
void buf_append_string(struct buffer_if *buf, string_t s)
{
    uint16_t len;

    len=strlen(s);
    buf_append_uint16(buf,len);
    memcpy(buf_append(buf,len),s,len);
}

void buffer_new(struct buffer_if *buf, uint32_t len)
{
    buf->free=True;
    buf->owner=NULL;
    buf->flags=0;
    buf->loc.file=NULL;
    buf->loc.line=0;
    buf->size=0;
    buf->len=len;
    buf->start=NULL;
    buf->base=safe_malloc(len,"buffer_new");
}

static list_t *buffer_apply(closure_t *self, struct cloc loc, dict_t *context,
			    list_t *args)
{
    struct buffer *st;
    item_t *item;
    dict_t *dict;
    bool_t lockdown=False;
    uint32_t len=DEFAULT_BUFFER_SIZE;
    
    st=safe_malloc(sizeof(*st),"buffer_apply");
    st->cl.description="buffer";
    st->cl.type=CL_BUFFER;
    st->cl.apply=NULL;
    st->cl.interface=&st->ops;

    /* First argument, if present, is buffer length */
    item=list_elem(args,0);
    if (item) {
	if (item->type!=t_number) {
	    cfgfatal(st->ops.loc,"buffer","first parameter must be a "
		     "number (buffer size)\n");
	}
	len=item->data.number;
	if (len<MIN_BUFFER_SIZE) {
	    cfgfatal(st->ops.loc,"buffer","ludicrously small buffer size\n");
	}
	if (len>MAX_BUFFER_SIZE) {
	    cfgfatal(st->ops.loc,"buffer","ludicrously large buffer size\n");
	}
    }
    /* Second argument, if present, is a dictionary */
    item=list_elem(args,1);
    if (item) {
	if (item->type!=t_dict) {
	    cfgfatal(st->ops.loc,"buffer","second parameter must be a "
		     "dictionary\n");
	}
	dict=item->data.dict;
	lockdown=dict_read_bool(dict,"lockdown",False,"buffer",st->ops.loc,
				False);
    }

    buffer_new(&st->ops,len);
    if (lockdown) {
	Message(M_WARNING,"buffer: XXX lockdown\n");
    }
    
    return new_closure(&st->cl);
}

init_module util_module;
void util_module(dict_t *dict)
{
    add_closure(dict,"logfile",logfile_apply);
    add_closure(dict,"sysbuffer",buffer_apply);
}
Commit	Line	Data
2fe58dfd SE	1	/* $Log: util.c,v $
	2	* Revision 1.2 1996/04/14 16:34:36 sde1000
	3	* Added syslog support
	4	* mpbin/mpstring functions moved from dh.c
	5	*
	6	* Revision 1.1 1996/03/14 17:05:03 sde1000
	7	* Initial revision
	8	*
	9	*/
	10
8689b3a9	11	#include "secnet.h"
2fe58dfd	12	#include <stdio.h>
2fe58dfd SE	13	#include <string.h>
2fe58dfd SE	14	#include <errno.h>
2fe58dfd	15	#include <unistd.h>
59635212	16	#include <limits.h>
2fe58dfd	17	#include <assert.h>
4efd681a	18	#include <sys/wait.h>
2fe58dfd	19	#include "util.h"
59635212	20	#include "unaligned.h"
2fe58dfd SE	21
	22	#define MIN_BUFFER_SIZE 64
	23	#define DEFAULT_BUFFER_SIZE 4096
	24	#define MAX_BUFFER_SIZE 131072
	25
	26	static char *hexdigits="0123456789abcdef";
	27
	28	uint32_t message_level=M_WARNING\|M_ERROR\|M_FATAL;
	29	uint32_t syslog_level=M_WARNING\|M_ERROR\|M_FATAL;
	30	static uint32_t current_phase=0;
	31
	32	struct phase_hook {
	33	hook_fn *fn;
	34	void *state;
	35	struct phase_hook *next;
	36	};
	37
	38	static struct phase_hook *hooks[NR_PHASES]={NULL,};
	39
	40	static void vMessage(uint32_t class, char *message, va_list args)
	41	{
	42	FILE *dest=stdout;
	43	if (class & message_level) {
	44	if (class&M_FATAL \|\| class&M_ERROR \|\| class&M_WARNING) {
	45	dest=stderr;
	46	}
	47	vfprintf(dest,message,args);
	48	}
	49	/* XXX do something about syslog output here */
	50	#if 0
	51	/* Maybe send message to syslog */
	52	vsprintf(buff, message, args);
	53	/* XXX Send each line as a separate log entry */
	54	log(syslog_prio[level], buff);
	55	#endif /* 0 */
	56	}
	57
	58	void Message(uint32_t class, char *message, ...)
	59	{
	60	va_list ap;
	61
	62	va_start(ap,message);
	63
	64	vMessage(class,message,ap);
	65
	66	va_end(ap);
	67	}
	68
	69	static void vfatal(int status, bool_t perror, char *message, va_list args)
	70	{
	71	int err;
	72
	73	err=errno;
	74
	75	enter_phase(PHASE_SHUTDOWN);
	76	if (perror) {
	77	Message(M_FATAL, "secnet fatal error: ");
	78	vMessage(M_FATAL, message, args);
	79	Message(M_FATAL, ": %s\n",strerror(err));
	80	}
	81	else {
	82	Message(M_FATAL, "secnet fatal error: ");
	83	vMessage(M_FATAL,message,args);
	84	}
85	exit(status);
86	}
87
88	void fatal(char *message, ...)
89	{
90	va_list args;
91	va_start(args,message);
92	vfatal(current_phase,False,message,args);
93	va_end(args);
94	}
95
96	void fatal_status(int status, char *message, ...)
97	{
98	va_list args;
99	va_start(args,message);
100	vfatal(status,False,message,args);
101	va_end(args);
102	}
103
104	void fatal_perror(char *message, ...)
105	{
106	va_list args;
107	va_start(args,message);
108	vfatal(current_phase,True,message,args);
109	va_end(args);
110	}
111
112	void fatal_perror_status(int status, char *message, ...)
113	{
114	va_list args;
115	va_start(args,message);
116	vfatal(status,True,message,args);
117	va_end(args);
118	}
119
120	void cfgfatal(struct cloc loc, string_t facility, char *message, ...)
121	{
122	va_list args;
123
124	va_start(args,message);
125
126	enter_phase(PHASE_SHUTDOWN);
127
128	if (loc.file && loc.line) {
129	Message(M_FATAL, "config error (%s, %s:%d): ",facility,loc.file,
130	loc.line);
131	} else if (!loc.file && loc.line) {
132	Message(M_FATAL, "config error (%s, line %d): ",facility,loc.line);
133	} else {
134	Message(M_FATAL, "config error (%s): ",facility);
135	}
136
137	vMessage(M_FATAL,message,args);
138	va_end(args);
139	exit(current_phase);
140	}
141
142	char safe_strdup(char s, char *message)
143	{
144	char *d;
145	d=strdup(s);
146	if (!d) {
147	fatal_perror(message);
148	}
149	return d;
150	}
151
152	void safe_malloc(size_t size, char message)
153	{
154	void *r;
155	r=malloc(size);
156	if (!r) {
157	fatal_perror(message);
158	}
159	return r;
160	}
161
162	/* Convert a buffer into its MP_INT representation */
163	void read_mpbin(MP_INT a, uint8_t bin, int binsize)
164	{
165	char *buff;
166	int i;
167
168	buff=safe_malloc(binsize*2 + 1,"read_mpbin");
169
170	for (i=0; i<binsize; i++) {
171	buff[i*2]=hexdigits[(bin[i] & 0xf0) >> 4];
172	buff[i*2+1]=hexdigits[(bin[i] & 0xf)];
173	}
174	buff[binsize*2]=0;
175
176	mpz_set_str(a, buff, 16);
177	free(buff);
178	}
179
180	/* Convert a MP_INT into a hex string */
181	char write_mpstring(MP_INT a)
182	{
183	char *buff;
184
185	buff=safe_malloc(mpz_sizeinbase(a,16)+2,"write_mpstring");
186	mpz_get_str(buff, 16, a);
187	return buff;
188	}
189
190	static uint8_t hexval(uint8_t c)
191	{
192	switch (c) {
193	case '0': return 0;
194	case '1': return 1;
195	case '2': return 2;
196	case '3': return 3;
197	case '4': return 4;
198	case '5': return 5;
199	case '6': return 6;
200	case '7': return 7;
201	case '8': return 8;
202	case '9': return 9;
203	case 'a': return 10;
204	case 'A': return 10;
205	case 'b': return 11;
206	case 'B': return 11;
207	case 'c': return 12;
208	case 'C': return 12;
209	case 'd': return 13;
210	case 'D': return 13;
211	case 'e': return 14;
212	case 'E': return 14;
213	case 'f': return 15;
214	case 'F': return 15;
215	}
216	return -1;
217	}
218
219	/* Convert a MP_INT into a buffer; return length; truncate if necessary */
220	uint32_t write_mpbin(MP_INT a, uint8_t buffer, uint32_t buflen)
221	{
222	char *hb;
223	int i,j,l;
224
225	if (buflen==0) return 0;
226	hb=write_mpstring(a);
227
228	l=strlen(hb);
229	i=0; j=0;
230	if (l&1) {
231	/* The number starts with a half-byte */
232	buffer[i++]=hexval(hb[j++]);
233	}
234	for (; hb[j] && i<buflen; i++) {
235	buffer[i]=(hexval(hb[j])<<4)\|hexval(hb[j+1]);
236	j+=2;
237	}
238	free(hb);
239	return i;
240	}
241
242	bool_t subnet_match(struct subnet_list *list, uint32_t address)
243	{
244	uint32_t i;
245	for (i=0; i<list->entries; i++) {
246	if (list->list[i].prefix == (address&list->list[i].mask)) return True;
247	}
248	return False;
249	}
250
baa06aeb SE	251	bool_t subnets_intersect(struct subnet a, struct subnet b)
	252	{
	253	uint32_t mask=a.mask&b.mask;
	254	return ((a.prefix&mask)==(b.prefix&mask));
	255	}
	256
	257	bool_t subnet_intersects_with_list(struct subnet a, struct subnet_list *b)
	258	{
	259	uint32_t i;
	260
	261	for (i=0; i<b->entries; i++) {
	262	if (subnets_intersect(a,b->list[i])) return True;
	263	}
	264	return False;
	265	}
	266
	267	bool_t subnet_lists_intersect(struct subnet_list a, struct subnet_list b)
	268	{
	269	uint32_t i;
	270	for (i=0; i<a->entries; i++) {
	271	if (subnet_intersects_with_list(a->list[i],b)) return True;
	272	}
	273	return False;
	274	}
	275
2fe58dfd SE	276	/* The string buffer must be at least 16 bytes long */
	277	string_t ipaddr_to_string(uint32_t addr)
	278	{
	279	uint8_t a,b,c,d;
	280	string_t s;
	281
	282	s=safe_malloc(16,"ipaddr_to_string");
	283	a=addr>>24;
	284	b=addr>>16;
	285	c=addr>>8;
	286	d=addr;
	287	snprintf(s, 16, "%d.%d.%d.%d", a, b, c, d);
	288	return s;
	289	}
	290
	291	string_t subnet_to_string(struct subnet *sn)
	292	{
	293	uint32_t mask=sn->mask, addr=sn->prefix;
	294	uint8_t a,b,c,d;
	295	string_t s;
	296	int i;
	297
	298	s=safe_malloc(19,"subnet_to_string");
	299	a=addr>>24;
	300	b=addr>>16;
	301	c=addr>>8;
	302	d=addr;
	303	for (i=0; mask; i++) {
	304	mask=(mask<<1);
	305	}
	306	snprintf(s, 19, "%d.%d.%d.%d/%d", a, b, c, d, i);
	307	return s;
	308	}
	309
4efd681a SE	310	int sys_cmd(const char path, char arg, ...)
	311	{
	312	va_list ap;
	313	int rv;
	314	pid_t c;
	315
	316	va_start(ap,arg);
	317	c=fork();
	318	if (c) {
	319	/* Parent -> wait for child */
	320	waitpid(c,&rv,0);
	321	} else if (c==0) {
	322	char *args[100];
	323	int i;
	324	/* Child -> exec command */
	325	args[0]=arg;
	326	i=1;
	327	while ((args[i++]=va_arg(ap,char *)));
	328	execvp(path,args);
	329	exit(1);
	330	} else {
	331	/* Error */
	332	fatal_perror("sys_cmd(%s,%s,...)");
	333	}
	334
	335	va_end(ap);
	336	return rv;
	337	}
	338
2fe58dfd SE	339	/* Take a list of log closures and merge them */
	340	struct loglist {
	341	struct log_if *l;
	342	struct loglist *next;
	343	};
	344
	345	static void log_vmulti(void state, int priority, char message, va_list args)
	346	{
	347	struct loglist st=state, i;
	348
	349	for (i=st; i; i=i->next) {
	350	i->l->vlog(i->l->st,priority,message,args);
	351	}
	352	}
	353
	354	static void log_multi(void st, int priority, char message, ...)
	355	{
	356	va_list ap;
	357
	358	va_start(ap,message);
	359
	360	log_vmulti(st,priority,message,ap);
	361
	362	va_end(ap);
	363	}
	364
	365	struct log_if init_log(list_t ll)
	366	{
	367	int i=0;
	368	item_t *item;
	369	closure_t *cl;
	370	struct loglist l=NULL, n;
	371	struct log_if *r;
	372
	373	while ((item=list_elem(ll,i++))) {
	374	if (item->type!=t_closure) {
	375	cfgfatal(item->loc,"init_log","item is not a closure");
	376	}
	377	cl=item->data.closure;
	378	if (cl->type!=CL_LOG) {
	379	cfgfatal(item->loc,"init_log","closure is not a logger");
	380	}
	381	n=safe_malloc(sizeof(*n),"init_log");
	382	n->l=cl->interface;
	383	n->next=l;
	384	l=n;
	385	}
	386	if (!l) {
	387	fatal("init_log: none of the items in the list are loggers");
	388	}
	389	r=safe_malloc(sizeof(*r), "init_log");
	390	r->st=l;
	391	r->log=log_multi;
	392	r->vlog=log_vmulti;
	393	return r;
	394	}
	395
	396	struct logfile {
	397	closure_t cl;
	398	struct log_if ops;
	399	FILE *f;
	400	};
	401
	402	static void logfile_vlog(void state, int priority, char message,
403	va_list args)
404	{
405	struct logfile *st=state;
406
407	vfprintf(st->f,message,args);
408	fprintf(st->f,"\n");
409	}
410
411	static void logfile_log(void state, int priority, char message, ...)
412	{
413	va_list ap;
414
415	va_start(ap,message);
416	logfile_vlog(state,priority,message,ap);
417	va_end(ap);
418	}
419
420	static list_t logfile_apply(closure_t self, struct cloc loc, dict_t *context,
421	list_t *data)
422	{
423	struct logfile *st;
424
425	st=safe_malloc(sizeof(*st),"logfile_apply");
426	st->cl.description="logfile";
427	st->cl.type=CL_LOG;
428	st->cl.apply=NULL;
429	st->cl.interface=&st->ops;
430	st->ops.st=st;
431	st->ops.log=logfile_log;
432	st->ops.vlog=logfile_vlog;
433	st->f=stderr; /* XXX ignore args */
434
435	return new_closure(&st->cl);
436	}
437
438	static char *phases[NR_PHASES]={
439	"PHASE_INIT",
440	"PHASE_GETOPTS",
441	"PHASE_READCONFIG",
442	"PHASE_SETUP",
baa06aeb	443	"PHASE_GETRESOURCES",
2fe58dfd SE	444	"PHASE_DROPPRIV",
	445	"PHASE_RUN",
	446	"PHASE_SHUTDOWN"
	447	};
	448
	449	void enter_phase(uint32_t new_phase)
	450	{
	451	struct phase_hook *i;
	452
baa06aeb SE	453	if (hooks[new_phase])
baa06aeb SE	454	Message(M_DEBUG_PHASE,"Running hooks for %s...\n", phases[new_phase]);
2fe58dfd SE	455	current_phase=new_phase;
	456
	457	for (i=hooks[new_phase]; i; i=i->next)
	458	i->fn(i->state, new_phase);
baa06aeb	459	Message(M_DEBUG_PHASE,"Now in %s\n",phases[new_phase]);
2fe58dfd SE	460	}
	461
	462	bool_t add_hook(uint32_t phase, hook_fn fn, void state)
	463	{
	464	struct phase_hook *h;
	465
	466	h=safe_malloc(sizeof(*h),"add_hook");
	467	h->fn=fn;
	468	h->state=state;
	469	h->next=hooks[phase];
	470	hooks[phase]=h;
	471	return True;
	472	}
	473
	474	bool_t remove_hook(uint32_t phase, hook_fn fn, void state)
	475	{
	476	fatal("remove_hook: not implemented\n");
	477
	478	return False;
	479	}
	480
	481	void log(struct log_if lf, int priority, char message, ...)
	482	{
	483	va_list ap;
	484
	485	va_start(ap,message);
	486	lf->vlog(lf->st,priority,message,ap);
	487	va_end(ap);
	488	}
	489
	490	struct buffer {
	491	closure_t cl;
	492	struct buffer_if ops;
	493	};
	494
	495	void buffer_assert_free(struct buffer_if *buffer, string_t file, uint32_t line)
	496	{
	497	if (!buffer->free) {
	498	fatal("BUF_ASSERT_FREE, %s line %d, owned by %s\n",
	499	file,line,buffer->owner);
	500	}
	501	}
	502
	503	void buffer_assert_used(struct buffer_if *buffer, string_t file, uint32_t line)
	504	{
	505	if (buffer->free) {
	506	fatal("BUF_ASSERT_USED, %s line %d, last owned by %s\n",
	507	file,line,buffer->owner);
	508	}
	509	}
	510
	511	void buffer_init(struct buffer_if *buffer, uint32_t max_start_pad)
	512	{
	513	buffer->start=buffer->base+max_start_pad;
	514	buffer->size=0;
	515	}
	516
	517	void buf_append(struct buffer_if buf, uint32_t amount) {
	518	void *p;
	519	p=buf->start + buf->size;
	520	buf->size+=amount;
	521	return p;
	522	}
	523
524	void buf_prepend(struct buffer_if buf, uint32_t amount) {
525	buf->size+=amount;
526	return buf->start-=amount;
527	}
528
529	void buf_unappend(struct buffer_if buf, uint32_t amount) {
530	if (buf->size < amount) return 0;
531	return buf->start+(buf->size-=amount);
532	}
533
534	void buf_unprepend(struct buffer_if buf, uint32_t amount) {
535	void *p;
536	p=buf->start;
537	buf->start+=amount;
538	buf->size-=amount;
539	return p;
540	}
541
542	/* Append a two-byte length and the string to the buffer. Length is in
543	network byte order. */
544	void buf_append_string(struct buffer_if *buf, string_t s)
545	{
546	uint16_t len;
547
548	len=strlen(s);
59635212	549	buf_append_uint16(buf,len);
2fe58dfd SE	550	memcpy(buf_append(buf,len),s,len);
	551	}
	552
	553	void buffer_new(struct buffer_if *buf, uint32_t len)
	554	{
	555	buf->free=True;
	556	buf->owner=NULL;
	557	buf->flags=0;
	558	buf->loc.file=NULL;
	559	buf->loc.line=0;
	560	buf->size=0;
	561	buf->len=len;
	562	buf->start=NULL;
	563	buf->base=safe_malloc(len,"buffer_new");
	564	}
	565
	566	static list_t buffer_apply(closure_t self, struct cloc loc, dict_t *context,
	567	list_t *args)
	568	{
	569	struct buffer *st;
	570	item_t *item;
	571	dict_t *dict;
	572	bool_t lockdown=False;
4efd681a	573	uint32_t len=DEFAULT_BUFFER_SIZE;
2fe58dfd SE	574
	575	st=safe_malloc(sizeof(*st),"buffer_apply");
	576	st->cl.description="buffer";
	577	st->cl.type=CL_BUFFER;
	578	st->cl.apply=NULL;
	579	st->cl.interface=&st->ops;
2fe58dfd SE	580
	581	/* First argument, if present, is buffer length */
	582	item=list_elem(args,0);
	583	if (item) {
	584	if (item->type!=t_number) {
	585	cfgfatal(st->ops.loc,"buffer","first parameter must be a "
	586	"number (buffer size)\n");
	587	}
4efd681a SE	588	len=item->data.number;
4efd681a SE	589	if (len<MIN_BUFFER_SIZE) {
2fe58dfd SE	590	cfgfatal(st->ops.loc,"buffer","ludicrously small buffer size\n");
2fe58dfd SE	591	}
4efd681a	592	if (len>MAX_BUFFER_SIZE) {
2fe58dfd SE	593	cfgfatal(st->ops.loc,"buffer","ludicrously large buffer size\n");
	594	}
	595	}
	596	/* Second argument, if present, is a dictionary */
	597	item=list_elem(args,1);
	598	if (item) {
	599	if (item->type!=t_dict) {
	600	cfgfatal(st->ops.loc,"buffer","second parameter must be a "
	601	"dictionary\n");
	602	}
	603	dict=item->data.dict;
	604	lockdown=dict_read_bool(dict,"lockdown",False,"buffer",st->ops.loc,
	605	False);
	606	}
	607
4efd681a	608	buffer_new(&st->ops,len);
2fe58dfd SE	609	if (lockdown) {
	610	Message(M_WARNING,"buffer: XXX lockdown\n");
	611	}
	612
	613	return new_closure(&st->cl);
	614	}
	615
	616	init_module util_module;
	617	void util_module(dict_t *dict)
	618	{
	619	add_closure(dict,"logfile",logfile_apply);
	620	add_closure(dict,"sysbuffer",buffer_apply);
	621	}