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1.1 root 1:
2: /* pgppager, designed to be possibly integrated with elm mail reader
3: *
4: * by Alessandro Bottonelli (c)1993, [email protected]
5: * version 1.0 - 29/Jan/93
6: *
7: * This program is put in the public domain and permission is granted
8: * to use it for any purpose, provided this copyright notice is retained.
9: * NO WARRANTIES expressed or implied are given. USE THIS PROGRAM AT
10: * YOUR OWN RISK!
11: *
12: * This programs reads from a specified file or from stdin if no file is
13: * specified and creates three temporary files (header, encrypted, and
14: * trailer) as needed, in order to store the header portion in cleartext,
15: * the encrypted portion still in cypher text, and the trailer portion of
16: * the clear text. Then, if applicable, the cleartext header is outputted,
17: * the encrypted portion is piped through pgp as needed, then the trailer
18: * (if any) is outputted. THIS PROCESS IS TRANSPARENT TO NON PGP ENCRYPTED
19: * TEXTS
20: *
21: * For use with ELM, it is necessary to specify the display to be:
22: *
23: * <whatever_path>/pgppager | pg
24: *
25: * in the elm option menu.
26: *
27: */
28:
29: #include <stdio.h>
30:
31: /*
32: * you may need to customize the next DEFINEs
33: */
34:
35: #define PGP "/usr/local/bin/pgp -f"
36: #define BEGIN "-----BEGIN PGP MESSAGE---"
37: #define END "-----END PGP MESSAGE---"
38:
39:
40: #define TEMP "/usr/tmp" /* Temporary dir of your choice */
41: #define CAT "cat -s" /* -s option to avoid cat complaining */
42: /* about missing files */
43:
44: /*
45: * program should be invoked as "pgppager [file] | pg"
46: * actually no check is made to verify that the program
47: * is piped through "pg" or "more", just in case someone
48: * wants to redirect it to a file or a printer.
49: * BEWARE: redirecting it to a file or printer may be
50: * not good for your security if the file or printer level
51: * of security is unknown or poor ...
52: */
53:
54: /*
55: * This three variables global to be visible to the Exit() routine
56: */
57:
58: char fh[128]; /* Header temporary file */
59: char fe[128]; /* Encrypted temporary file */
60: char fr[128]; /* Trailer temporary file */
61:
62: main(ac,av)
63: int ac;
64: char **av;
65: {
66: FILE *fp; /* File pointer to read file(s) */
67: FILE *ft; /* File pointer to temp file(s) */
68: char line[256]; /* Read/Write buffer */
69: char cmd[128]; /* command string */
70:
71:
72:
73: /*
74: * Must be invoked as "pgppager [file_name]"
75: */
76:
77: if ( ac > 2 )
78: {
79: fprintf(stderr,"Usage: %s [file_name]\n", av[0]);
80: Exit(1);
81: }
82:
83: /*
84: * File ( if specified ) must exist and be readable
85: */
86:
87: if ( ac == 2 )
88: {
89: if ( ( fp = fopen( av[1], "r") ) == NULL )
90: {
91: fprintf(stderr,"%s: cannot read %s\n", av[0], av[1]);
92: Exit(2);
93: }
94: }
95: else
96: fp=stdin; /* if no file specified assume standard input */
97:
98: /*
99: * Build temporary file names
100: *
101: * please note how, as files are created for writing, they are
102: * also chmod(ed) to 0600. I expect most PGP users to have their
103: * umask set to 077, but just to be on the safe side ... :-)
104: */
105:
106: sprintf ( fh, "%s/pgpm.head.%d", TEMP, (int )getpid() );
107: sprintf ( fe, "%s/pgpm.encr.%d", TEMP, (int )getpid() );
108: sprintf ( fr, "%s/pgpm.trai.%d", TEMP, (int )getpid() );
109:
110:
111: /*
112: * READ file until Eof, redirect to "fe" only those portions of the
113: * file that are between the BEGIN PGP and END PGP MESSAGE lines.
114: */
115: if ( ( ft = fopen ( fh, "w") ) == NULL )
116: {
117: fprintf(stderr,"%s: error opening temp file\n", av[0]);
118: Exit(4);
119: }
120:
121: if ( (int )chmod( fh, 0600) != 0 )
122: {
123: fprintf(stderr,"%s: cannot chmod temp file\n", av[0]);
124: Exit(5);
125: }
126:
127: fprintf( ft, "\n"); /* Just to start with a blank line */
128:
129: while ( fgets( line, 128, fp) != NULL )
130: {
131: if ( !strncmp( BEGIN, line, strlen( BEGIN) ))
132: {
133: fprintf(ft, "\n===pgp encrypted message begins===\n");
134: fclose(ft);
135:
136: if ( ( ft = fopen ( fe, "w") ) == NULL )
137: {
138: fprintf(stderr,"%s: error opening temp file\n", av[0]);
139: Exit(4);
140: }
141:
142: if ( (int )chmod( fe, 0600) != 0 )
143: {
144: fprintf(stderr,"%s: cannot chmod temp file\n", av[0]);
145: Exit(5);
146: }
147: }
148:
149: fprintf( ft, "%s", line);
150:
151: if ( !strncmp( END, line, strlen( END) ))
152: {
153: fclose(ft);
154:
155: if ( ( ft = fopen ( fr, "w") ) == NULL )
156: {
157: fprintf(stderr,"%s: error opening temp file\n", av[0]);
158: Exit(4);
159: }
160:
161: if ( (int )chmod( fr, 0600) != 0 )
162: {
163: fprintf(stderr,"%s: cannot chmod temp file\n", av[0]);
164: Exit(5);
165: }
166:
167: fprintf(ft, "\n===pgp encrypted message ends===\n");
168: }
169: }
170:
171: fclose(fp);
172: fclose(ft);
173:
174: sprintf( cmd, "%s %s", CAT, fh);
175: system(cmd);
176: sprintf( cmd, "%s %s | %s", CAT, fe, PGP);
177: system(cmd);
178: sprintf( cmd, "%s %s", CAT, fr);
179: system(cmd);
180:
181: Exit(0); /* That's all folks ... */
182: }
183:
184: /*
185: * Exit(s) are centralized in this routine to make sure we wipe out
186: * temporary files in any case ...
187: */
188:
189: Exit(n)
190: int n; /* value to be returned to the shell (0 = OK) */
191: {
192: /*
193: * Remove temporary files (if any)
194: * and sync() just for the sake of it
195: */
196:
197: unlink(fh);
198: unlink(fe);
199: unlink(fr);
200: sync();
201:
202: exit(n);
203: }
204:
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