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/* $OpenBSD: protocol.c,v 1.2 2001/09/21 20:22:06 camield Exp $ */
/*
* POP protocol handling.
*/
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <signal.h>
#include <setjmp.h>
#include <string.h>
#include <stdarg.h>
#include "misc.h"
#include "params.h"
#include "protocol.h"
struct pop_buffer pop_buffer;
static sigjmp_buf pop_timed_out;
void pop_init(void)
{
pop_buffer.ptr = pop_buffer.size = 0;
}
void pop_clean(void)
{
memset(pop_buffer.data, 0, pop_buffer.ptr);
memmove(pop_buffer.data, &pop_buffer.data[pop_buffer.ptr],
pop_buffer.size -= pop_buffer.ptr);
pop_buffer.ptr = 0;
}
int pop_sane(void)
{
return (unsigned int)pop_buffer.size <= sizeof(pop_buffer.data) &&
(unsigned int)pop_buffer.ptr <= (unsigned int)pop_buffer.size;
}
static void pop_timeout(int signum)
{
signal(SIGALRM, SIG_DFL);
siglongjmp(pop_timed_out, 1);
}
static int pop_fetch(void)
{
signal(SIGALRM, pop_timeout);
alarm(POP_TIMEOUT);
pop_buffer.size = read(0, pop_buffer.data, sizeof(pop_buffer.data));
alarm(0);
signal(SIGALRM, SIG_DFL);
pop_buffer.ptr = 0;
return pop_buffer.size <= 0;
}
static int pop_get_char(void)
{
if (pop_buffer.ptr >= pop_buffer.size)
if (pop_fetch()) return -1;
return (unsigned char)pop_buffer.data[pop_buffer.ptr++];
}
static char *pop_get_line(char *line, int size)
{
int pos;
int seen_cr, seen_nul;
int c;
pos = 0;
seen_cr = seen_nul = 0;
while ((c = pop_get_char()) >= 0) {
if (c == '\n') {
if (seen_cr) line[pos - 1] = 0;
break;
}
if (pos < size - 1)
seen_cr = ((line[pos++] = c) == '\r');
else
seen_cr = 0;
seen_nul |= !c;
}
line[pos] = 0;
if (seen_nul)
line[0] = 0;
if (pos || c >= 0)
return line;
else
return NULL;
}
int pop_handle_state(struct pop_command *commands)
{
char line[POP_BUFFER_SIZE];
char *params;
struct pop_command *command;
int response;
if (sigsetjmp(pop_timed_out, 1)) return POP_CRASH_NETTIME;
while (pop_get_line(line, sizeof(line))) {
if ((params = strchr(line, ' '))) {
*params++ = 0;
if (!*params) params = NULL;
}
response = POP_ERROR;
for (command = commands; command->name; command++)
if (!strcasecmp(command->name, line)) {
response = command->handler(params);
break;
}
switch (response) {
case POP_OK:
if (pop_reply_ok()) return POP_CRASH_NETFAIL;
break;
case POP_ERROR:
if (pop_reply_error()) return POP_CRASH_NETFAIL;
case POP_QUIET:
break;
case POP_LEAVE:
if (pop_reply_ok()) return POP_CRASH_NETFAIL;
default:
return response;
}
}
return POP_CRASH_NETFAIL;
}
char *pop_get_param(char **params)
{
char *current, *next;
if ((current = *params)) {
if ((next = strchr(current, ' '))) {
*next++ = 0;
*params = *next ? next : NULL;
} else
*params = NULL;
if (strlen(current) > 40) current = NULL;
}
return current;
}
int pop_get_int(char **params)
{
char *param, *error;
long value;
if ((param = pop_get_param(params))) {
value = strtol(param, &error, 10);
if (!*param || *error || (value & ~0x3FFFFFFFL)) return -1;
return value;
}
return -1;
}
int pop_reply(char *format, ...)
{
va_list args;
va_start(args, format);
vfprintf(stdout, format, args);
va_end(args);
putc('\r', stdout);
putc('\n', stdout);
switch (format[0]) {
case '+':
case '-':
return fflush(stdout);
case '.':
if (!format[1]) return fflush(stdout);
}
return ferror(stdout);
}
int pop_reply_ok(void)
{
return pop_reply("+OK");
}
int pop_reply_error(void)
{
return pop_reply("-ERR");
}
int pop_reply_multiline(int fd, long size, int lines)
{
char *in_buffer, *out_buffer;
char *in, *out;
int in_block, out_block;
int start, body;
if (lines >= 0) lines++;
if (pop_reply_ok()) return 1;
in_buffer = malloc(RETR_BUFFER_SIZE * 3);
if (!in_buffer) return 1;
out_buffer = &in_buffer[RETR_BUFFER_SIZE];
start = 1;
body = 0;
while (size && lines) {
if (size > RETR_BUFFER_SIZE)
in_block = read(fd, in_buffer, RETR_BUFFER_SIZE);
else
in_block = read(fd, in_buffer, size);
if (in_block <= 0) {
free(in_buffer);
return 1;
}
in = in_buffer;
out = out_buffer;
while (in < &in_buffer[in_block] && lines)
switch (*in) {
case '\n':
*out++ = '\r';
*out++ = *in++;
if (start) body = 1;
if (body) lines--;
start = 1;
break;
case '.':
if (start) *out++ = '.';
default:
*out++ = *in++;
start = 0;
}
out_block = out - out_buffer;
if (write_loop(1, out_buffer, out_block) != out_block) {
free(in_buffer);
return 1;
}
size -= in_block;
}
free(in_buffer);
if (!start)
if (pop_reply("%s", "")) return 1;
return 0;
}
int pop_reply_terminate(void)
{
return pop_reply(".");
}
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