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emailler/apps/pop65.c

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/////////////////////////////////////////////////////////////////
// POP65
// Post Office Protocol v3 (POP3) Client for IP65
// https://www.ietf.org/rfc/rfc1939.txt
// (Based on IP65's wget65.c)
// Bobbi June 2020
/////////////////////////////////////////////////////////////////
#include <cc65.h>
#include <errno.h>
#include <ctype.h>
#include <fcntl.h>
#include <conio.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include "../inc/ip65.h"
#include "w5100.h"
#include "w5100_http.h"
#include "linenoise.h"
#include "email_common.h"
#define BACKSPACE 8
// Both pragmas are obligatory to have cc65 generate code
// suitable to access the W5100 auto-increment registers.
#pragma optimize (on)
#pragma static-locals (on)
#define NETBUFSZ 1500
#define LINEBUFSZ 1000 // According to RFC2822 Section 2.1.1 (998+CRLF)
#define READSZ 1024 // Must be less than NETBUFSZ to fit in buf[]
static unsigned char buf[NETBUFSZ+1]; // One extra byte for null terminator
static char linebuf[LINEBUFSZ];
char filename[80];
int len;
FILE *fp;
uint32_t filesize;
/*
* Keypress before quit
*/
void confirm_exit(void) {
printf("\nPress any key ");
cgetc();
exit(0);
}
/*
* Called for all non IP65 errors
*/
void error_exit() {
confirm_exit();
}
/*
* Called if IP65 call fails
*/
void ip65_error_exit(void) {
printf("%s\n", ip65_strerror(ip65_error));
confirm_exit();
}
/*
* Print message to the console, stripping extraneous CRLF stuff
* from the end.
*/
void print_strip_crlf(char *s) {
uint8_t i = 0;
while ((s[i] != '\0') && (s[i] != '\r') && (s[i] != '\n'))
putchar(s[i++]);
putchar('\n');
}
/*
* Spinner while downloading files
*/
void spinner(uint32_t sz, uint8_t final) {
static char chars[] = "|/-\\";
static char buf[10] = "";
static uint8_t i = 0;
uint8_t j;
for (j = 0; j < strlen(buf); ++j)
putchar(BACKSPACE);
if (final) {
sprintf(buf, " [%lu]\n", sz);
printf("%s", buf);
strcpy(buf, "");
}
else {
sprintf(buf, "%c %lu", chars[(i++) % 4], sz);
printf("%s", buf);
}
}
#define DO_SEND 1 // For do_send param
#define DONT_SEND 0 // For do_send param
#define CMD_MODE 0 // For mode param
#define DATA_MODE 1 // For mode param
// Modified verson of w5100_http_open from w5100_http.c
// Sends a TCP message and receives a the first packet of the response.
// sendbuf is the buffer to send (null terminated)
// recvbuf is the buffer into which the received message will be written
// length is the length of recvbuf[]
// do_send Do the sending if true, otherwise skip
// mode Binary mode for received message, maybe first block of long message
bool w5100_tcp_send_recv(char* sendbuf, char* recvbuf, size_t length,
uint8_t do_send, uint8_t mode) {
if (do_send == DO_SEND) {
uint16_t snd;
uint16_t pos = 0;
uint16_t len = strlen(sendbuf);
if (strncmp(sendbuf, "PASS", 4) == 0)
printf(">PASS ****\n");
else {
putchar('>');
print_strip_crlf(sendbuf);
}
while (len) {
if (input_check_for_abort_key())
{
printf("User abort\n");
w5100_disconnect();
return false;
}
snd = w5100_send_request();
if (!snd) {
if (!w5100_connected()) {
printf("Connection lost\n");
return false;
}
continue;
}
if (len < snd)
snd = len;
{
// One less to allow for faster pre-increment below
const char *dataptr = sendbuf + pos - 1;
uint16_t i;
for (i = 0; i < snd; ++i) {
// The variable is necessary to have cc65 generate code
// suitable to access the W5100 auto-increment register.
char data = *++dataptr;
*w5100_data = data;
}
}
w5100_send_commit(snd);
len -= snd;
pos += snd;
}
}
if (mode == DATA_MODE) {
//
// Handle email body
//
uint16_t rcv, written;
uint16_t len = 0;
uint8_t cont = 1;
// Backspace to put spinner on same line as RETR
for (rcv = 0; rcv < 15; ++rcv)
putchar(BACKSPACE);
filesize = 0;
while(cont) {
if (input_check_for_abort_key()) {
printf("User abort\n");
w5100_disconnect();
return false;
}
rcv = w5100_receive_request();
if (!rcv) {
cont = w5100_connected();
if (cont)
continue;
}
if (rcv > length - len)
rcv = length - len;
{
// One less to allow for faster pre-increment below
char *dataptr = recvbuf + len - 1;
uint16_t i;
for (i = 0; i < rcv; ++i) {
// The variable is necessary to have cc65 generate code
// suitable to access the W5100 auto-increment register.
char data = *w5100_data;
*++dataptr = data;
// TODO -- check we are not looking before start of recvbuf here!!
// TODO -- this doesn't handle the case where the sequence is split across
// packets!!!
if (!memcmp(dataptr - 4, "\r\n.\r\n", 5))
cont = 0;
}
}
w5100_receive_commit(rcv);
len += rcv;
written = fwrite(recvbuf, 1, len, fp);
if (written != len) {
printf("Write error");
fclose(fp);
error_exit();
}
filesize += len;
spinner(filesize, 0);
len = 0;
}
} else {
//
// Handle short single packet ASCII text responses
//
uint16_t rcv;
uint16_t len = 0;
while(1) {
if (input_check_for_abort_key()) {
printf("User abort\n");
w5100_disconnect();
return false;
}
rcv = w5100_receive_request();
if (rcv)
break;
if (!w5100_connected()) {
printf("Connection lost\n");
return false;
}
}
if (rcv > length - len)
rcv = length - len;
{
// One less to allow for faster pre-increment below
char *dataptr = recvbuf + len - 1;
uint16_t i;
for (i = 0; i < rcv; ++i) {
// The variable is necessary to have cc65 generate code
// suitable to access the W5100 auto-increment register.
char data = *w5100_data;
*++dataptr = data;
}
w5100_receive_commit(rcv);
len += rcv;
}
putchar('<');
print_strip_crlf(recvbuf);
}
return true;
}
/*
* Check expected string from server
*/
void expect(char *buf, char *s) {
if (strncmp(buf, s, strlen(s)) != 0) {
printf("\nExpected '%s' got '%s\n", s, buf);
error_exit();
}
}
/*
* Read parms from POP65.CFG
*/
void readconfigfile(void) {
fp = fopen("POP65.CFG", "r");
if (!fp) {
puts("Can't open config file POP65.CFG");
error_exit();
}
fscanf(fp, "%s", cfg_server);
fscanf(fp, "%s", cfg_user);
fscanf(fp, "%s", cfg_pass);
fscanf(fp, "%s", cfg_spooldir);
fscanf(fp, "%s", cfg_inboxdir);
fclose(fp);
}
/*
* Read a text file a line at a time leaving the line in linebuf[]
* Returns number of chars in the line, or -1 if EOF.
* Converts line endings from CRLF -> CR (Apple ][ style)
*/
int16_t get_line(FILE *fp) {
static uint16_t rd = 0;
static uint16_t buflen = 0;
uint8_t found = 0;
uint16_t j = 0;
uint16_t i;
while (1) {
for (i = rd; i < buflen; ++i) {
linebuf[j++] = buf[i];
// The following line is safe because j>=1 at this point
if ((linebuf[j - 1] == '\n') && (linebuf[j - 2] == '\r')) {
found = 1;
break;
}
}
if (found) {
rd = i + 1;
linebuf[j - 1] = '\0'; // Remove LF from end
return j - 2;
}
buflen = fread(buf, 1, READSZ, fp);
if (buflen == 0) {
rd = 0;
return -1; // Hit EOF before we found EOL
}
rd = 0;
}
}
/*
* Update EMAIL.DB - quick access database for header info
*/
void update_email_db(struct emailhdrs *h) {
FILE *fp;
sprintf(filename, "%s/EMAIL.DB", cfg_inboxdir);
fp = fopen(filename, "a");
if (!fp) {
printf("Can't open %s\n", filename);
error_exit();
}
fwrite(h, sizeof(struct emailhdrs), 1, fp);
fclose(fp);
}
/*
* Copy one header from source->dest, removing '\r' from end
*/
void copyheader(char *dest, char *source, uint16_t len) {
uint16_t i;
memset(dest, ' ', len);
for (i = 0; i < len; ++i) {
if ((*source == '\0') || (*source == '\r'))
return;
*dest++ = *source++;
}
}
/*
* Write NEXT.EMAIL file with number of next EMAIL.n file to be created
*/
void write_next_email(uint16_t num) {
sprintf(filename, "%s/NEXT.EMAIL", cfg_inboxdir);
fp = fopen(filename, "wb");
if (!fp) {
printf("Can't open %s\n", filename);
fclose(fp);
error_exit();
}
fprintf(fp, "%u", num);
fclose(fp);
}
/*
* Update INBOX
* Copy messages from spool dir to inbox and find headers of interest
* (Date, From, To, BCC, Subject)
*/
void update_inbox(uint16_t nummsgs) {
static struct emailhdrs hdrs;
uint16_t nextemail, msg, chars, headerchars;
uint8_t headers;
FILE *destfp;
sprintf(filename, "%s/NEXT.EMAIL", cfg_inboxdir);
fp = fopen(filename, "r");
if (!fp) {
nextemail = 1;
write_next_email(nextemail);
} else {
fscanf(fp, "%u", &nextemail);
fclose(fp);
}
for (msg = 1; msg <= nummsgs; ++msg) {
strcpy(linebuf, "");
sprintf(filename, "%s/EMAIL.%u", cfg_spooldir, msg);
fp = fopen(filename, "r");
if (!fp) {
printf("Can't open %s\n", filename);
error_exit();
}
hdrs.emailnum = nextemail;
sprintf(filename, "%s/EMAIL.%u", cfg_inboxdir, nextemail++);
puts(filename);
destfp = fopen(filename, "wb");
if (!destfp) {
printf("Can't open %s\n", filename);
fclose(fp);
error_exit();
}
headers = 1;
headerchars = 0;
hdrs.skipbytes = 0; // Just in case it doesn't get set
while ((chars = get_line(fp)) != -1) {
if (headers) {
headerchars += chars + 1; // Don't forget the LF we deleted
if (!strncmp(linebuf, "Date: ", 6)) {
copyheader(hdrs.date, linebuf + 6, 39);
hdrs.date[79] = '\0';
}
if (!strncmp(linebuf, "From: ", 6)) {
copyheader(hdrs.from, linebuf + 6, 79);
hdrs.from[79] = '\0';
}
if (!strncmp(linebuf, "To: ", 4)) {
copyheader(hdrs.to, linebuf + 4, 79);
hdrs.to[79] = '\0';
}
if (!strncmp(linebuf, "Cc: ", 4)) {
copyheader(hdrs.cc, linebuf + 4, 79);
hdrs.cc[79] = '\0';
}
if (!strncmp(linebuf, "Subject: ", 9)) {
copyheader(hdrs.subject, linebuf + 9, 79);
hdrs.subject[79] = '\0';
}
//if (linebuf[0] == '\r') {
if (strlen(linebuf) < 10) {
headers = 0;
hdrs.skipbytes = headerchars;
}
}
fputs(linebuf, destfp);
}
fclose(fp);
fclose(destfp);
update_email_db(&hdrs);
}
write_next_email(nextemail);
}
void main(void) {
uint8_t eth_init = ETH_INIT_DEFAULT;
char sendbuf[80];
uint16_t msg, nummsgs;
uint32_t bytes;
videomode(VIDEOMODE_80COL);
printf("\nReading POP65.CFG -");
readconfigfile();
printf(" Ok");
{
int file;
printf("\nSetting slot - ");
file = open("ethernet.slot", O_RDONLY);
if (file != -1) {
read(file, &eth_init, 1);
close(file);
eth_init &= ~'0';
}
}
printf("%d\nInitializing %s - ", eth_init, eth_name);
if (ip65_init(eth_init)) {
ip65_error_exit();
}
// Abort on Ctrl-C to be consistent with Linenoise
abort_key = 0x83;
printf("Ok\nObtaining IP address - ");
if (dhcp_init()) {
ip65_error_exit();
}
// Copy IP config from IP65 to W5100
w5100_config(eth_init);
printf("Ok\nConnecting to %s - ", cfg_server);
if (!w5100_connect(parse_dotted_quad(cfg_server), 110)) {
printf("Fail\n");
error_exit();
}
printf("Ok\n\n");
if (!w5100_tcp_send_recv(sendbuf, buf, NETBUFSZ, DONT_SEND, CMD_MODE)) {
error_exit();
}
expect(buf, "+OK");
sprintf(sendbuf, "USER %s\r\n", cfg_user);
if (!w5100_tcp_send_recv(sendbuf, buf, NETBUFSZ, DO_SEND, CMD_MODE)) {
error_exit();
}
expect(buf, "+OK");
sprintf(sendbuf, "PASS %s\r\n", cfg_pass);
if (!w5100_tcp_send_recv(sendbuf, buf, NETBUFSZ, DO_SEND, CMD_MODE)) {
error_exit();
}
expect(buf, "+OK Logged in.");
if (!w5100_tcp_send_recv("STAT\r\n", buf, NETBUFSZ, DO_SEND, CMD_MODE)) {
error_exit();
}
sscanf(buf, "+OK %u %lu", &nummsgs, &bytes);
printf(" %u message(s), %lu total bytes\n", nummsgs, bytes);
for (msg = 1; msg <= nummsgs; ++msg) {
sprintf(filename, "%s/EMAIL.%u", cfg_spooldir, msg);
remove(filename); /// TO MAKE DEBUGGING EASIER - GET RID OF THIS
fp = fopen(filename, "wb");
if (!fp) {
printf("Can't create %s\n", filename);
error_exit();
}
sprintf(sendbuf, "RETR %u\r\n", msg);
if (!w5100_tcp_send_recv(sendbuf, buf, NETBUFSZ, DO_SEND, DATA_MODE)) {
error_exit();
}
fclose(fp);
spinner(filesize, 1); // Cleanup spinner
}
// Ignore any error - can be a race condition where other side
// disconnects too fast and we get an error
w5100_tcp_send_recv("QUIT\r\n", buf, NETBUFSZ, DO_SEND, CMD_MODE);
printf("Disconnecting\n");
w5100_disconnect();
printf("Updating INBOX ...\n");
update_inbox(nummsgs);
confirm_exit();
}
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