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emailler/apps/attacher.c

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C
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/////////////////////////////////////////////////////////////////////////////
// Handle attaching files to outgoing messages
// Bobbi July 2020
/////////////////////////////////////////////////////////////////////////////
#include <conio.h>
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <unistd.h>
#include "email_common.h"
#define BELL 0x07
#define BACKSPACE 0x08
#define RETURN 0x0d
#define NORMAL 0x0e
#define INVERSE 0x0f
#define DELETE 0x7f
#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];
static char userentry[80];
static uint8_t quit_to_email; // If 1, launch EMAIL.SYSTEM on quit
static char filename[80];
#define ERR_NONFATAL 0
#define ERR_FATAL 1
/*
* Show error messages
*/
void error(uint8_t fatal, const char *fmt, ...) {
va_list v;
if (fatal) {
videomode(VIDEOMODE_80COL);
clrscr();
printf("\n\n%cFATAL ERROR:%c\n\n", INVERSE, NORMAL);
va_start(v, fmt);
vprintf(fmt, v);
va_end(v);
printf("\n\n\n\n[Press Any Key To Quit]");
cgetc();
exit(1);
} else {
putchar('\r');
va_start(v, fmt);
vprintf(fmt, v);
va_end(v);
printf(" - [Press Any Key]");
cgetc();
putchar('\r');
}
}
/*
* Spinner while encoding attachments
*/
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);
}
}
/*
* Read parms from EMAIL.CFG
*/
void readconfigfile(void) {
FILE *fp = fopen("EMAIL.CFG", "r");
if (!fp)
error(ERR_FATAL, "Can't open config file EMAIL.CFG");
fscanf(fp, "%s", cfg_server);
fscanf(fp, "%s", cfg_user);
fscanf(fp, "%s", cfg_pass);
fscanf(fp, "%s", cfg_pop_delete);
fscanf(fp, "%s", cfg_smtp_server);
fscanf(fp, "%s", cfg_smtp_domain);
fscanf(fp, "%s", cfg_instdir);
fscanf(fp, "%s", cfg_emaildir);
fscanf(fp, "%s", cfg_emailaddr);
fclose(fp);
}
/*
* Read a text file a line at a time
* Returns number of chars in the line, or -1 if EOF.
* Expects Apple ][ style line endings (CR) and does no conversion
* fp - file to read from
* writep - Pointer to buffer into which line will be written
*/
int16_t get_line(FILE *fp, char *writep) {
static uint16_t rd = 0; // Read
static uint16_t end = 0; // End of valid data in buf
uint16_t i = 0;
while (1) {
if (rd == end) {
end = fread(buf, 1, READSZ, fp);
rd = 0;
}
if (end == 0)
return -1; // EOF
writep[i++] = buf[rd++];
if (writep[i - 1] == '\r') {
writep[i] = '\0';
return i;
}
}
}
/*
* Base64 encode table
*/
static const char b64enc[] =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
/*
* Encode Base64 format
* p - Pointer to source buffer
* q - Pointer to destination buffer
* len - Length of buffer to encode
* Returns length of encoded data
*/
uint16_t encode_base64(char *p, char *q, uint16_t len) {
uint16_t j = 0;
uint16_t i, ii;
for (i = 0; i < len / 3; ++i) {
ii = 3 * i;
q[j++] = b64enc[(p[ii] & 0xfc) >> 2];
q[j++] = b64enc[((p[ii] & 0x03) << 4) | ((p[ii + 1] & 0xf0) >> 4)];
q[j++] = b64enc[((p[ii + 1] & 0x0f) << 2) | ((p[ii + 2] & 0xc0) >> 6)];
q[j++] = b64enc[(p[ii + 2] & 0x3f)];
if (((i + 1) % 18) == 0)
q[j++] = '\r';
}
ii += 3;
i = len - ii; // Bytes remaining to encode
switch (i) {
case 1:
q[j++] = b64enc[(p[ii] & 0xfc) >> 2];
q[j++] = b64enc[(p[ii] & 0x03) << 4];
q[j++] = '=';
q[j++] = '=';
break;
case 2:
q[j++] = b64enc[(p[ii] & 0xfc) >> 2];
q[j++] = b64enc[((p[ii] & 0x03) << 4) | ((p[ii + 1] & 0xf0) >> 4)];
q[j++] = b64enc[(p[ii + 1] & 0x0f) << 2];
q[j++] = '=';
break;
}
q[j] = '\0';
return j;
}
/*
* Prompt for a name, store it in userentry
* Returns number of chars read.
* prompt - Message to display before > prompt
* is_file - if 1, restrict chars to those allowed in ProDOS filename
* Returns number of chars read
*/
uint8_t prompt_for_name(char *prompt, uint8_t is_file) {
uint16_t i;
char c;
printf("%s>", prompt);
i = 0;
while (1) {
c = cgetc();
if (is_file && !isalnum(c) &&
(c != RETURN) && (c != BACKSPACE) && (c != DELETE) &&
(c != '.') && (c != '/')) {
putchar(BELL);
continue;
}
switch (c) {
case RETURN:
goto done;
case BACKSPACE:
case DELETE:
if (i > 0) {
putchar(BACKSPACE);
putchar(' ');
putchar(BACKSPACE);
--i;
} else
putchar(BELL);
break;
default:
putchar(c);
userentry[i++] = c;
}
if (i == 79)
goto done;
}
done:
userentry[i] = '\0';
return i;
}
/*
* Optionally attach files to outgoing email.
* filename - Name of file containing email message
*/
void attach(char *fname) {
FILE *fp, *fp2, *destfp;
uint16_t chars, i;
uint32_t size;
char *s;
videomode(VIDEOMODE_80COL);
printf("%c%s ATTACHER%c\n\n", 0x0f, PROGNAME, 0x0e);
fp = fopen(fname, "rb+");
if (!fp)
error(ERR_FATAL, "Can't open %s", fname);
sprintf(filename, "%s/OUTBOX/TMPFILE", cfg_emaildir);
destfp = fopen(filename, "wb");
if (!destfp)
error(ERR_FATAL, "Can't open TMPFILE");
printf("Copying email content ... "); // Space is for spinner to eat
size = 0;
while ((chars = get_line(fp, linebuf)) != -1) {
size += chars;
if (linebuf[0] == '\r')
break;
fputs(linebuf, destfp);
spinner(size, 0);
}
fprintf(destfp, "MIME-Version: 1.0\r");
fprintf(destfp, "Content-Type: multipart/mixed; boundary=a2forever\r\r");
fprintf(destfp, "This is a multi-part message in MIME format.\r");
fprintf(destfp, "--a2forever\r");
fprintf(destfp, "Content-Type: text/plain; charset=US-ASCII\r");
fprintf(destfp, "Content-Transfer-Encoding: 7bit\r\r");
while ((chars = get_line(fp, linebuf)) != -1) {
size += chars;
fputs(linebuf, destfp);
spinner(size, 0);
}
spinner(size, 1);
printf("\rEnter the filename or filenames to attach to the email.\n");
printf("An empty entry means you are done attaching files.\n\n");
while (prompt_for_name("File to attach", 1)) {
s = strrchr(userentry, '/');
if (!s)
s = userentry;
else
s = s + 1; // Character after the slash
if (strlen(s) == 0) {
error(ERR_NONFATAL, "Illegal trailing /");
continue;
}
fp2 = fopen(userentry, "rb");
if (!fp2) {
error(ERR_NONFATAL, "Can't open %s", userentry);
continue;
}
fprintf(destfp, "\r--a2forever\r");
fprintf(destfp, "Content-Type: application/octet-stream\r");
fprintf(destfp, "Content-Transfer-Encoding: base64\r");
fprintf(destfp, "Content-Disposition: attachment; filename=%s;\r\r", s);
printf("\r "); // Space is for spinner to eat
size = 0;
do {
i = fread(buf, 1, 72 * 3 / 4 * 5, fp2); // Multiple of 72*3/4 bytes
size += i;
if (i == 0)
break;
i = encode_base64(buf, buf + READSZ / 2, i);
i = fwrite(buf + READSZ / 2, 1, i, destfp);
spinner(size, 0);
} while (!feof(fp2));
fclose(fp2);
spinner(size, 1);
}
fprintf(destfp, "\r--a2forever--\r");
fclose(fp);
fclose(destfp);
if (unlink(fname))
error(ERR_FATAL, "Can't delete %s", fname);
if (rename(filename, fname))
error(ERR_FATAL, "Can't rename %s to %s", filename, fname);
}
/*
* Load EMAIL.SYSTEM to $2000 and jump to it
* (This code is in language card space so it can't possibly be trashed)
*/
#pragma code-name (push, "LC")
void load_email(void) {
revers(0);
clrscr();
exec("EMAIL.SYSTEM", NULL); // Assume it is in current directory
}
#pragma code-name (pop)
void main(int argc, char *argv[]) {
readconfigfile();
if (argc == 2) {
quit_to_email = 1;
attach(argv[1]);
} else
error(ERR_FATAL, "No email file specified");
if (quit_to_email)
load_email();
}
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