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connect.c
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connect.c
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/* connect.c
* (c) 2002 Mikulas Patocka
* This file is a part of the Links program, released under GPL.
*/
#include "links.h"
/*
#define LOG_TRANSFER "/tmp/log"
#define LOG_SSL
*/
#ifdef LOG_TRANSFER
static void log_data(unsigned char *data, int len)
{
static int hlaseno = 0;
int fd;
if (!hlaseno) {
printf("\n"ANSI_SET_BOLD"WARNING -- LOGGING NETWORK TRANSFERS !!!"ANSI_CLEAR_BOLD ANSI_BELL"\n");
fflush(stdout);
sleep(1);
hlaseno = 1;
}
EINTRLOOP(fd, open(LOG_TRANSFER, O_WRONLY | O_APPEND | O_CREAT, 0600));
if (fd != -1) {
int rw;
set_bin(fd);
EINTRLOOP(rw, write(fd, data, len));
EINTRLOOP(rw, close(fd));
}
}
#else
#define log_data(x, y)
#endif
#ifdef LOG_SSL
#include <openssl/err.h>
#endif
static inline void log_ssl_error(int line, int ret1, int ret2)
{
#ifdef LOG_SSL
SSL_load_error_strings();
ERR_print_errors_fp(stderr);
debug("ssl error at %d: %d, %d, %d (%s)", line, ret1, ret2, errno, strerror(errno));
#endif
}
static void connected(struct connection *);
static void dns_found(struct connection *, int);
static void try_connect(struct connection *);
static void handle_socks_reply(struct connection *);
static void exception(struct connection *c)
{
setcstate(c, S_EXCEPT);
retry_connection(c);
}
int socket_and_bind(int pf, unsigned char *address)
{
int s;
int rs;
EINTRLOOP(s, socket(pf, SOCK_STREAM, IPPROTO_TCP));
if (s == -1)
return -1;
if (address && *address) {
switch (pf) {
case PF_INET: {
struct sockaddr_in sa;
unsigned char addr[4];
if (numeric_ip_address(address, addr) == -1) {
EINTRLOOP(rs, close(s));
errno = EINVAL;
return -1;
}
memset(&sa, 0, sizeof sa);
sa.sin_family = AF_INET;
memcpy(&sa.sin_addr.s_addr, addr, 4);
sa.sin_port = htons(0);
EINTRLOOP(rs, bind(s, (struct sockaddr *)(void *)&sa, sizeof sa));
if (rs) {
int sv_errno = errno;
EINTRLOOP(rs, close(s));
errno = sv_errno;
return -1;
}
break;
}
#ifdef SUPPORT_IPV6
case PF_INET6: {
struct sockaddr_in6 sa;
unsigned char addr[16];
unsigned scope;
if (numeric_ipv6_address(address, addr, &scope) == -1) {
EINTRLOOP(rs, close(s));
errno = EINVAL;
return -1;
}
memset(&sa, 0, sizeof sa);
sa.sin6_family = AF_INET6;
memcpy(&sa.sin6_addr, addr, 16);
sa.sin6_port = htons(0);
#ifdef SUPPORT_IPV6_SCOPE
sa.sin6_scope_id = scope;
#endif
EINTRLOOP(rs, bind(s, (struct sockaddr *)(void *)&sa, sizeof sa));
if (rs) {
int sv_errno = errno;
EINTRLOOP(rs, close(s));
errno = sv_errno;
return -1;
}
break;
}
#endif
default: {
EINTRLOOP(rs, close(s));
errno = EINVAL;
return -1;
}
}
}
return s;
}
void close_socket(int *s)
{
int rs;
if (*s == -1) return;
EINTRLOOP(rs, close(*s));
set_handlers(*s, NULL, NULL, NULL, NULL);
*s = -1;
}
struct conn_info {
void (*func)(struct connection *);
struct lookup_result addr;
int addr_index;
int first_error;
int port;
int *sock;
int real_port;
int socks_byte_count;
unsigned char socks_reply[8];
unsigned char *host;
unsigned char *dns_append;
};
void make_connection(struct connection *c, int port, int *sock, void (*func)(struct connection *))
{
int real_port = -1;
int as;
unsigned char *dns_append = cast_uchar "";
unsigned char *host;
struct conn_info *b;
if (*c->socks_proxy) {
unsigned char *p = cast_uchar strchr(cast_const_char c->socks_proxy, '@');
if (p) p++;
else p = c->socks_proxy;
host = stracpy(p);
real_port = port;
port = 1080;
if ((p = cast_uchar strchr(cast_const_char host, ':'))) {
long lp;
*p++ = 0;
if (!*p) goto badu;
lp = strtol(cast_const_char p, (char **)(void *)&p, 10);
if (*p || lp <= 0 || lp >= 65536) {
badu:
mem_free(host);
setcstate(c, S_BAD_URL);
abort_connection(c);
return;
}
port = (int)lp;
}
dns_append = proxies.dns_append;
} else if (!(host = get_host_name(c->url))) {
setcstate(c, S_INTERNAL);
abort_connection(c);
return;
}
if (c->newconn)
internal("already making a connection");
b = mem_calloc(sizeof(struct conn_info) + strlen(cast_const_char host) + 1 + strlen(cast_const_char dns_append) + 1);
b->func = func;
b->sock = sock;
b->port = port;
b->real_port = real_port;
b->host = (unsigned char *)(b + 1);
strcpy(cast_char b->host, cast_const_char host);
b->dns_append = cast_uchar strchr(cast_const_char b->host, 0) + 1;
strcpy(cast_char b->dns_append, cast_const_char dns_append);
c->newconn = b;
log_data(cast_uchar "\nCONNECTION: ", 13);
log_data(host, strlen(cast_const_char host));
log_data(cast_uchar "\n", 1);
if (c->no_cache >= NC_RELOAD) as = find_host_no_cache(host, &b->addr, &c->dnsquery, (void(*)(void *, int))dns_found, c);
else as = find_host(host, &b->addr, &c->dnsquery, (void(*)(void *, int))dns_found, c);
mem_free(host);
if (as) setcstate(c, S_DNS);
}
int is_ipv6(int h)
{
#ifdef SUPPORT_IPV6
union {
struct sockaddr sa;
struct sockaddr_in sin;
struct sockaddr_in6 sin6;
char pad[128];
} u;
socklen_t len = sizeof(u);
int rs;
EINTRLOOP(rs, getsockname(h, &u.sa, &len));
if (rs) return 0;
return u.sa.sa_family == AF_INET6;
#else
return 0;
#endif
}
int get_pasv_socket(struct connection *c, int cc, int *sock, unsigned char *port)
{
int s;
int rs;
struct sockaddr_in sa;
struct sockaddr_in sb;
socklen_t len = sizeof(sa);
memset(&sa, 0, sizeof sa);
memset(&sb, 0, sizeof sb);
EINTRLOOP(rs, getsockname(cc, (struct sockaddr *)(void *)&sa, &len));
if (rs) goto e;
if (sa.sin_family != AF_INET) {
errno = EINVAL;
goto e;
}
EINTRLOOP(s, socket(PF_INET, SOCK_STREAM, IPPROTO_TCP));
if (s == -1) goto e;
*sock = s;
set_nonblock(s);
memcpy(&sb, &sa, sizeof(struct sockaddr_in));
sb.sin_port = htons(0);
EINTRLOOP(rs, bind(s, (struct sockaddr *)(void *)&sb, sizeof sb));
if (rs) goto e;
len = sizeof(sa);
EINTRLOOP(rs, getsockname(s, (struct sockaddr *)(void *)&sa, &len));
if (rs) goto e;
EINTRLOOP(rs, listen(s, 1));
if (rs) goto e;
memcpy(port, &sa.sin_addr.s_addr, 4);
memcpy(port + 4, &sa.sin_port, 2);
return 0;
e:
setcstate(c, get_error_from_errno(errno));
retry_connection(c);
return -1;
}
#ifdef SUPPORT_IPV6
int get_pasv_socket_ipv6(struct connection *c, int cc, int *sock, unsigned char *result)
{
int s;
int rs;
struct sockaddr_in6 sa;
struct sockaddr_in6 sb;
socklen_t len = sizeof(sa);
memset(&sa, 0, sizeof sa);
memset(&sb, 0, sizeof sb);
EINTRLOOP(rs, getsockname(cc, (struct sockaddr *)(void *)&sa, &len));
if (rs) goto e;
if (sa.sin6_family != AF_INET6) {
errno = EINVAL;
goto e;
}
EINTRLOOP(s, socket(PF_INET6, SOCK_STREAM, IPPROTO_TCP));
if (s == -1) goto e;
*sock = s;
set_nonblock(s);
memcpy(&sb, &sa, sizeof(struct sockaddr_in6));
sb.sin6_port = htons(0);
EINTRLOOP(rs, bind(s, (struct sockaddr *)(void *)&sb, sizeof sb));
if (rs) goto e;
len = sizeof(sa);
EINTRLOOP(rs, getsockname(s, (struct sockaddr *)(void *)&sa, &len));
if (rs) goto e;
EINTRLOOP(rs, listen(s, 1));
if (rs) goto e;
sprintf(cast_char result, "|2|%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x|%d|",
sa.sin6_addr.s6_addr[0],
sa.sin6_addr.s6_addr[1],
sa.sin6_addr.s6_addr[2],
sa.sin6_addr.s6_addr[3],
sa.sin6_addr.s6_addr[4],
sa.sin6_addr.s6_addr[5],
sa.sin6_addr.s6_addr[6],
sa.sin6_addr.s6_addr[7],
sa.sin6_addr.s6_addr[8],
sa.sin6_addr.s6_addr[9],
sa.sin6_addr.s6_addr[10],
sa.sin6_addr.s6_addr[11],
sa.sin6_addr.s6_addr[12],
sa.sin6_addr.s6_addr[13],
sa.sin6_addr.s6_addr[14],
sa.sin6_addr.s6_addr[15],
htons(sa.sin6_port) & 0xffff);
return 0;
e:
setcstate(c, get_error_from_errno(errno));
retry_connection(c);
return -1;
}
#endif
#ifdef HAVE_SSL
static void ssl_want_read(struct connection *c)
{
int ret1, ret2;
struct conn_info *b = c->newconn;
set_connection_timeout(c);
switch ((ret2 = SSL_get_error(c->ssl, ret1 = SSL_connect(c->ssl)))) {
case SSL_ERROR_NONE:
c->newconn = NULL;
b->func(c);
mem_free(b);
break;
case SSL_ERROR_WANT_READ:
set_handlers(*b->sock, (void(*)(void *))ssl_want_read, NULL, (void(*)(void *))exception, c);
break;
case SSL_ERROR_WANT_WRITE:
set_handlers(*b->sock, NULL, (void(*)(void *))ssl_want_read, (void(*)(void *))exception, c);
break;
default:
log_ssl_error(__LINE__, ret1, ret2);
c->no_tsl++;
setcstate(c, S_SSL_ERROR);
retry_connection(c);
break;
}
}
#endif
static void handle_socks(struct connection *c)
{
struct conn_info *b = c->newconn;
unsigned char *command = init_str();
int len = 0;
unsigned char *host;
int wr;
setcstate(c, S_SOCKS_NEG);
set_connection_timeout(c);
add_bytes_to_str(&command, &len, cast_uchar "\004\001", 2);
add_chr_to_str(&command, &len, b->real_port >> 8);
add_chr_to_str(&command, &len, b->real_port);
add_bytes_to_str(&command, &len, cast_uchar "\000\000\000\001", 4);
if (strchr(cast_const_char c->socks_proxy, '@'))
add_bytes_to_str(&command, &len, c->socks_proxy, strcspn(cast_const_char c->socks_proxy, "@"));
add_chr_to_str(&command, &len, 0);
if (!(host = get_host_name(c->url))) {
mem_free(command);
setcstate(c, S_INTERNAL);
abort_connection(c);
return;
}
add_to_str(&command, &len, host);
add_to_str(&command, &len, b->dns_append);
add_chr_to_str(&command, &len, 0);
mem_free(host);
if (b->socks_byte_count >= len) {
mem_free(command);
setcstate(c, S_MODIFIED);
retry_connection(c);
return;
}
EINTRLOOP(wr, (int)write(*b->sock, command + b->socks_byte_count, len - b->socks_byte_count));
mem_free(command);
if (wr <= 0) {
setcstate(c, wr ? get_error_from_errno(errno) : S_CANT_WRITE);
retry_connection(c);
return;
}
b->socks_byte_count += wr;
if (b->socks_byte_count < len) {
set_handlers(*b->sock, NULL, (void(*)(void *))handle_socks, (void(*)(void *))exception, c);
return;
} else {
b->socks_byte_count = 0;
set_handlers(*b->sock, (void(*)(void *))handle_socks_reply, NULL, (void(*)(void *))exception, c);
return;
}
}
static void handle_socks_reply(struct connection *c)
{
struct conn_info *b = c->newconn;
int rd;
set_connection_timeout(c);
EINTRLOOP(rd, (int)read(*b->sock, b->socks_reply + b->socks_byte_count, sizeof b->socks_reply - b->socks_byte_count));
if (rd <= 0) {
setcstate(c, rd ? get_error_from_errno(errno) : S_CANT_READ);
retry_connection(c);
return;
}
b->socks_byte_count += rd;
if (b->socks_byte_count < (int)sizeof b->socks_reply) return;
/* debug("%x %x %x %x %x %x %x %x", b->socks_reply[0], b->socks_reply[1], b->socks_reply[2], b->socks_reply[3], b->socks_reply[4], b->socks_reply[5], b->socks_reply[6], b->socks_reply[7]); */
if (b->socks_reply[0]) {
setcstate(c, S_BAD_SOCKS_VERSION);
abort_connection(c);
return;
}
switch (b->socks_reply[1]) {
case 91:
setcstate(c, S_SOCKS_REJECTED);
retry_connection(c);
return;
case 92:
setcstate(c, S_SOCKS_NO_IDENTD);
abort_connection(c);
return;
case 93:
setcstate(c, S_SOCKS_BAD_USERID);
abort_connection(c);
return;
default:
setcstate(c, S_SOCKS_UNKNOWN_ERROR);
retry_connection(c);
return;
case 90:
break;
}
b->real_port = -1;
connected(c);
}
static void dns_found(struct connection *c, int state)
{
if (state) {
setcstate(c, S_NO_DNS);
abort_connection(c);
return;
}
try_connect(c);
}
static void retry_connect(struct connection *c, int err)
{
struct conn_info *b = c->newconn;
if (!b->addr_index) b->first_error = err;
b->addr_index++;
if (b->addr_index < b->addr.n) {
close_socket(b->sock);
try_connect(c);
} else {
setcstate(c, b->first_error);
retry_connection(c);
}
}
static void try_connect(struct connection *c)
{
int s;
int rs;
struct conn_info *b = c->newconn;
struct host_address *addr = &b->addr.a[b->addr_index];
if (addr->af == AF_INET) {
s = socket_and_bind(PF_INET, bind_ip_address);
#ifdef SUPPORT_IPV6
} else if (addr->af == AF_INET6) {
s = socket_and_bind(PF_INET6, bind_ipv6_address);
#endif
} else {
setcstate(c, S_INTERNAL);
abort_connection(c);
return;
}
if (s == -1) {
retry_connect(c, get_error_from_errno(errno));
return;
}
set_nonblock(s);
*b->sock = s;
if (addr->af == AF_INET) {
struct sockaddr_in sa;
memset(&sa, 0, sizeof sa);
sa.sin_family = AF_INET;
memcpy(&sa.sin_addr.s_addr, addr->addr, 4);
sa.sin_port = htons(b->port);
EINTRLOOP(rs, connect(s, (struct sockaddr *)(void *)&sa, sizeof sa));
#ifdef SUPPORT_IPV6
} else if (addr->af == AF_INET6) {
struct sockaddr_in6 sa;
memset(&sa, 0, sizeof sa);
sa.sin6_family = AF_INET6;
memcpy(&sa.sin6_addr, addr->addr, 16);
#ifdef SUPPORT_IPV6_SCOPE
sa.sin6_scope_id = addr->scope_id;
#endif
sa.sin6_port = htons(b->port);
EINTRLOOP(rs, connect(s, (struct sockaddr *)(void *)&sa, sizeof sa));
#endif
} else {
rs = -1;
errno = EINVAL;
}
if (rs) {
if (errno != EALREADY && errno != EINPROGRESS) {
#ifdef BEOS
if (errno == EWOULDBLOCK) errno = ETIMEDOUT;
#endif
retry_connect(c, get_error_from_errno(errno));
return;
}
set_handlers(s, NULL, (void(*)(void *))connected, (void(*)(void *))exception, c);
setcstate(c, !b->addr_index ? S_CONN : S_CONN_ANOTHER);
} else {
connected(c);
}
}
void continue_connection(struct connection *c, int *sock, void (*func)(struct connection *))
{
struct conn_info *b;
if (c->newconn)
internal("already making a connection");
b = mem_calloc(sizeof(struct conn_info));
b->func = func;
b->sock = sock;
b->real_port = -1;
c->newconn = b;
log_data(cast_uchar "\nCONTINUE CONNECTION\n", 21);
connected(c);
}
static void connected(struct connection *c)
{
struct conn_info *b = c->newconn;
int err = 0;
socklen_t len = sizeof(int);
int rs;
#ifdef SO_ERROR
errno = 0;
EINTRLOOP(rs, getsockopt(*b->sock, SOL_SOCKET, SO_ERROR, (void *)&err, &len));
if (!rs) {
if (err >= 10000) err -= 10000; /* Why does EMX return so large values? */
} else {
if (!(err = errno)) {
retry_connect(c, S_STATE);
return;
}
}
if (err > 0
#ifdef EISCONN
&& err != EISCONN
#endif
) {
#ifdef DOS
if (err == EALREADY) err = ETIMEDOUT;
#endif
retry_connect(c, get_error_from_errno(err));
return;
}
#endif
if (b->addr_index) {
int i;
for (i = 0; i < b->addr_index; i++)
dns_set_priority(b->host, &b->addr.a[i], 0);
dns_set_priority(b->host, &b->addr.a[i], 1);
}
set_connection_timeout(c);
if (b->real_port != -1) {
handle_socks(c);
return;
}
#ifdef HAVE_SSL
if (c->ssl) {
int ret1, ret2;
c->ssl = getSSL();
if (!c->ssl) {
goto ssl_error;
}
SSL_set_fd(c->ssl, *b->sock);
switch ((ret2 = SSL_get_error(c->ssl, ret1 = SSL_connect(c->ssl)))) {
case SSL_ERROR_WANT_READ:
setcstate(c, S_SSL_NEG);
set_handlers(*b->sock, (void(*)(void *))ssl_want_read, NULL, (void(*)(void *))exception, c);
return;
case SSL_ERROR_WANT_WRITE:
setcstate(c, S_SSL_NEG);
set_handlers(*b->sock, NULL, (void(*)(void *))ssl_want_read, (void(*)(void *))exception, c);
return;
case SSL_ERROR_NONE:
break;
default:
log_ssl_error(__LINE__, ret1, ret2);
ssl_error:
c->no_tsl++;
setcstate(c, S_SSL_ERROR);
retry_connection(c);
return;
}
}
#endif
c->newconn = NULL;
b->func(c);
mem_free(b);
}
struct write_buffer {
int sock;
int len;
int pos;
void (*done)(struct connection *);
unsigned char data[1];
};
static void write_select(struct connection *c)
{
struct write_buffer *wb;
int wr;
if (!(wb = c->buffer)) {
internal("write socket has no buffer");
setcstate(c, S_INTERNAL);
abort_connection(c);
return;
}
set_connection_timeout(c);
/*printf("ws: %d\n",wb->len-wb->pos);
for (wr = wb->pos; wr < wb->len; wr++) printf("%c", wb->data[wr]);
printf("-\n");*/
#ifdef HAVE_SSL
if(c->ssl) {
if ((wr = SSL_write(c->ssl, wb->data + wb->pos, wb->len - wb->pos)) <= 0) {
int err;
if ((err = SSL_get_error(c->ssl, wr)) != SSL_ERROR_WANT_WRITE) {
setcstate(c, wr ? (err == SSL_ERROR_SYSCALL ? get_error_from_errno(errno) : S_SSL_ERROR) : S_CANT_WRITE);
if (c->state == S_SSL_ERROR)
log_ssl_error(__LINE__, wr, err);
if (!wr || err == SSL_ERROR_SYSCALL) retry_connection(c);
else abort_connection(c);
return;
}
else return;
}
} else
#endif
{
EINTRLOOP(wr, (int)write(wb->sock, wb->data + wb->pos, wb->len - wb->pos));
if (wr <= 0) {
#if defined(ATHEOS) || defined(DOS)
/* Workaround for a bug in Syllable */
if (wr && (errno == EAGAIN || errno == EWOULDBLOCK)) {
return;
}
#endif
setcstate(c, wr ? get_error_from_errno(errno) : S_CANT_WRITE);
retry_connection(c);
return;
}
}
if ((wb->pos += wr) == wb->len) {
void (*f)(struct connection *) = wb->done;
c->buffer = NULL;
set_handlers(wb->sock, NULL, NULL, NULL, NULL);
mem_free(wb);
f(c);
}
}
void write_to_socket(struct connection *c, int s, unsigned char *data, int len, void (*write_func)(struct connection *))
{
struct write_buffer *wb;
log_data(data, len);
if ((unsigned)len > MAXINT - sizeof(struct write_buffer)) overalloc();
wb = mem_alloc(sizeof(struct write_buffer) + len);
wb->sock = s;
wb->len = len;
wb->pos = 0;
wb->done = write_func;
memcpy(wb->data, data, len);
if (c->buffer) mem_free(c->buffer);
c->buffer = wb;
set_handlers(s, NULL, (void (*)(void *))write_select, (void (*)(void *))exception, c);
}
#define READ_SIZE 64240
static void read_select(struct connection *c)
{
struct read_buffer *rb;
int rd;
if (!(rb = c->buffer)) {
internal("read socket has no buffer");
setcstate(c, S_INTERNAL);
abort_connection(c);
return;
}
set_handlers(rb->sock, NULL, NULL, NULL, NULL);
if ((unsigned)rb->len > MAXINT - sizeof(struct read_buffer) - READ_SIZE) overalloc();
rb = mem_realloc(rb, sizeof(struct read_buffer) + rb->len + READ_SIZE);
c->buffer = rb;
#ifdef HAVE_SSL
if(c->ssl) {
if ((rd = SSL_read(c->ssl, rb->data + rb->len, READ_SIZE)) <= 0) {
int err;
if ((err = SSL_get_error(c->ssl, rd)) == SSL_ERROR_WANT_READ) {
read_from_socket(c, rb->sock, rb, rb->done);
return;
}
if (rb->close && !rd) {
rb->close = 2;
rb->done(c, rb);
return;
}
setcstate(c, rd ? (err == SSL_ERROR_SYSCALL ? get_error_from_errno(errno) : S_SSL_ERROR) : S_CANT_READ);
if (c->state == S_SSL_ERROR)
log_ssl_error(__LINE__, rd, err);
/*mem_free(rb);*/
if (!rd || err == SSL_ERROR_SYSCALL) retry_connection(c);
else abort_connection(c);
return;
}
} else
#endif
{
EINTRLOOP(rd, (int)read(rb->sock, rb->data + rb->len, READ_SIZE));
if (rd <= 0) {
if (rb->close && !rd) {
rb->close = 2;
rb->done(c, rb);
return;
}
if (!rd) {
/* Many servers supporting compression have a bug
--- they send the size of uncompressed data.
Turn off compression support once before the final retry.
*/
unsigned char *prot, *h;
if (is_last_try(c) && (prot = get_protocol_name(c->url))) {
if (!strcasecmp(cast_const_char prot, "http")) {
if ((h = get_host_name(c->url))) {
add_blacklist_entry(h, BL_NO_COMPRESSION);
mem_free(h);
}
}
mem_free(prot);
}
}
setcstate(c, rd ? get_error_from_errno(errno) : S_CANT_READ);
/*mem_free(rb);*/
retry_connection(c);
return;
}
}
log_data(rb->data + rb->len, rd);
rb->len += rd;
rb->done(c, rb);
}
struct read_buffer *alloc_read_buffer(struct connection *c)
{
struct read_buffer *rb;
rb = mem_alloc(sizeof(struct read_buffer) + READ_SIZE);
memset(rb, 0, sizeof(struct read_buffer));
return rb;
}
void read_from_socket(struct connection *c, int s, struct read_buffer *buf, void (*read_func)(struct connection *, struct read_buffer *))
{
buf->done = read_func;
buf->sock = s;
if (c->buffer && buf != c->buffer) mem_free(c->buffer);
c->buffer = buf;
set_handlers(s, (void (*)(void *))read_select, NULL, (void (*)(void *))exception, c);
}
void kill_buffer_data(struct read_buffer *rb, int n)
{
if (n > rb->len || n < 0) {
internal("called kill_buffer_data with bad value");
rb->len = 0;
return;
}
memmove(rb->data, rb->data + n, rb->len - n);
rb->len -= n;
}