tools/mpack-1.6/unixos.c

/* (C) Copyright 1993,1994 by Carnegie Mellon University
 * All Rights Reserved.
 *
 * Permission to use, copy, modify, distribute, and sell this software
 * and its documentation for any purpose is hereby granted without
 * fee, provided that the above copyright notice appear in all copies
 * and that both that copyright notice and this permission notice
 * appear in supporting documentation, and that the name of Carnegie
 * Mellon University not be used in advertising or publicity
 * pertaining to distribution of the software without specific,
 * written prior permission.  Carnegie Mellon University makes no
 * representations about the suitability of this software for any
 * purpose.  It is provided "as is" without express or implied
 * warranty.
 *
 * CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO
 * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE
 * FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
 * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
 * SOFTWARE.
 */
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/param.h>
#include <netdb.h>
#include <fcntl.h>
#include "xmalloc.h"
#include "common.h"
#include "part.h"

#ifndef MAXHOSTNAMELEN
#define MAXHOSTNAMELEN 64
#endif

extern int errno;
extern char *malloc();
extern char *getenv();

int overwrite_files = 0;
int didchat;

/* The name of the file we're writing */
static char *output_fname = 0;

/* Characters that shouldn't be in filenames */
#define BADCHARS "!$&*()|\'\";<>[]{}?/`\\ \t"

/* Generate a message-id */
char *os_genid(void)
{
    static int pid = 0;
    static time_t curtime;
    static char hostname[MAXHOSTNAMELEN+1];
    char *result;
    struct hostent *hp;
    

    if (pid == 0) {
        pid = getpid();
        time(&curtime);
        gethostname(hostname, sizeof(hostname));

        /* If we don't have a FQDN, try canonicalizing with gethostbyname */
        if (!strchr(hostname, '.')) {
            hp = gethostbyname(hostname);
            if (hp) {
                strcpy(hostname, hp->h_name);
            }
        }
    }

    result = malloc(25+strlen(hostname));
    sprintf(result, "%d.%d@%s", pid, curtime++, hostname);
    return result;
}

/* Create and return directory for a message-id */
char *os_idtodir(char *id)
{
    static char buf[4096];
    char *p;

    if (getenv("TMPDIR")) {
        strcpy(buf, getenv("TMPDIR"));
    }
    else {
        strcpy(buf, "/usr/tmp");
    }
    strcat(buf, "/m-prts-");
    p = getenv("USER");
    if (!p) p = getenv("LOGNAME");
    if (!p) p = "x";
    strcat(buf, p);
    
    (void)mkdir(buf, 0700);

    p = buf + strlen(buf);
    *p++ = '/';
    while (*id && p < buf+sizeof(buf)-10 ) {
        if (isprint(*id) && !strchr(BADCHARS, *id)) *p++ = *id;
        id++;
    }
    *p = '\0';
    if (mkdir(buf, 0700) == -1 && errno != EEXIST) {
        perror(buf);
        return 0;
    }
    *p++ = '/';
    *p = '\0';
    return buf;
}

/*
 * We are done with the directory returned by os_idtodir()
 * Remove it
 */
void os_donewithdir(char *dir)
{
    char *p;

    /* Remove trailing slash */
    p = dir + strlen(dir) - 1;
    *p = '\0';

    rmdir(dir);
}

FILE *os_createnewfile(char *fname)
{
    int fd;
    FILE *ret;
     
#ifdef O_EXCL
    fd=open(fname, O_RDWR|O_CREAT|O_EXCL, 0644);
#else
    fd=open(fname, O_RDWR|O_CREAT|O_TRUNC, 0644);
#endif

    if (fd == -1)
        return NULL;
     
    ret=fdopen(fd, "w");
    return ret;
}

     
/*
 * Create a new file, with suggested filename "fname".
 * "fname" may have come from an insecure source, so clean it up first.
 * It may also be null.
 * "contentType" is passed in for use by systems that have typed filesystems.
 * "flags" contains a bit pattern describing attributes of the new file.
 */
FILE *os_newtypedfile(char *fname, char *contentType, int flags, params contentParams)
{
    char *p;
    static int filesuffix=0;
    char buf[128], *descfname=0;
    FILE *outfile = 0;

    if (!fname) fname = "";

    /* If absolute path name, chop to tail */
    if (*fname == '/') {
        p = strrchr(fname, '/');
        fname = p+1;
    }

    /* Get rid of leading ~ or ~/ */
    while (*fname == '~' || *fname == '/') fname++;

    while (!strncmp(fname, "../", 3)) fname += 3;
    
    /* Clean out bad characters, create directories along path */
    for (p=fname; *p; p++) {
        if (*p == '/') {
            if (!strncmp(p, "/../", 4)) {
                p[1] = p[2] = 'X';
            }
            *p = '\0';
            (void) mkdir(fname, 0777);
            *p = '/';
        }
        else if (!isprint(*p) || strchr(BADCHARS, *p)) *p = 'X';
    }

    if (!fname[0]) {
        do {
            if (outfile) fclose(outfile);
            sprintf(buf, "part%d", ++filesuffix);
        } while (outfile = fopen(buf, "r"));
        fname = buf;
    }
    else if (!overwrite_files && (outfile = fopen(fname, "r"))) {
        do {
            fclose(outfile);
            sprintf(buf, "%s.%d", fname, ++filesuffix);
         
        } while (outfile = fopen(buf, "r"));
        fname = buf;
    }

    if (overwrite_files)
         outfile = fopen(fname, "w");
    else
         outfile = os_createnewfile(fname);
    
    if (!outfile) {
        perror(fname);
    }

    if (output_fname) free(output_fname);
    output_fname = strsave(fname);

    if (strlen(fname) > sizeof(buf)-6) {
        descfname = xmalloc(strlen(fname)+6);
    }
    else {
        descfname = buf;
    }
    strcpy(descfname, fname);

    p = strchr(descfname, '/');
    if (!p) p = descfname;
    if (p = strrchr(p, '.')) *p = '\0';

    strcat(descfname, ".desc");
    (void) rename(TEMPFILENAME, descfname);
    if (descfname != buf) free(descfname);
    
    fprintf(stdout, "%s (%s)\n", output_fname, contentType);
    didchat = 1;

    return outfile;
}

/*
 * Close a file opened by os_newTypedFile()
 */
void os_closetypedfile(FILE *outfile)
{
    fclose(outfile);
}

/*
 * (Don't) Handle a BinHex'ed file
 */
int
os_binhex(struct part *inpart, int part, int nparts)
{
    return 1;
}

/*
 * Warn user that the MD5 digest of the last file created by os_newtypedfile()
 * did not match that supplied in the Content-MD5: header.
 */
void os_warnMD5mismatch(void)
{
    char *warning;

    warning = xmalloc(strlen(output_fname) + 100);
    sprintf(warning, "%s was corrupted in transit",
            output_fname);
    warn(warning);
    free(warning);
}

/*
 * Report an error (in errno) concerning a filename
 */
void os_perror(char *file)
{
    perror(file);
}
1	edhill	1.1	/* (C) Copyright 1993,1994 by Carnegie Mellon University
2			* All Rights Reserved.
3			*
4			* Permission to use, copy, modify, distribute, and sell this software
5			* and its documentation for any purpose is hereby granted without
6			* fee, provided that the above copyright notice appear in all copies
7			* and that both that copyright notice and this permission notice
8			* appear in supporting documentation, and that the name of Carnegie
9			* Mellon University not be used in advertising or publicity
10			* pertaining to distribution of the software without specific,
11			* written prior permission. Carnegie Mellon University makes no
12			* representations about the suitability of this software for any
13			* purpose. It is provided "as is" without express or implied
14			* warranty.
15			*
16			* CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO
17			* THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
18			* AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE
19			* FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
20			* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
21			* AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
22			* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
23			* SOFTWARE.
24			*/
25			#include <stdio.h>
26			#include <ctype.h>
27			#include <string.h>
28			#include <errno.h>
29			#include <sys/types.h>
30			#include <sys/param.h>
31			#include <netdb.h>
32			#include <fcntl.h>
33			#include "xmalloc.h"
34			#include "common.h"
35			#include "part.h"
36
37			#ifndef MAXHOSTNAMELEN
38			#define MAXHOSTNAMELEN 64
39			#endif
40
41			extern int errno;
42			extern char *malloc();
43			extern char *getenv();
44
45			int overwrite_files = 0;
46			int didchat;
47
48			/* The name of the file we're writing */
49			static char *output_fname = 0;
50
51			/* Characters that shouldn't be in filenames */
52			#define BADCHARS "!$&*()\|\'\";<>[]{}?/`\\ \t"
53
54			/* Generate a message-id */
55			char *os_genid(void)
56			{
57			static int pid = 0;
58			static time_t curtime;
59			static char hostname[MAXHOSTNAMELEN+1];
60			char *result;
61			struct hostent *hp;
62
63
64			if (pid == 0) {
65			pid = getpid();
66			time(&curtime);
67			gethostname(hostname, sizeof(hostname));
68
69			/* If we don't have a FQDN, try canonicalizing with gethostbyname */
70			if (!strchr(hostname, '.')) {
71			hp = gethostbyname(hostname);
72			if (hp) {
73			strcpy(hostname, hp->h_name);
74			}
75			}
76			}
77
78			result = malloc(25+strlen(hostname));
79			sprintf(result, "%d.%d@%s", pid, curtime++, hostname);
80			return result;
81			}
82
83			/* Create and return directory for a message-id */
84			char os_idtodir(char id)
85			{
86			static char buf[4096];
87			char *p;
88
89			if (getenv("TMPDIR")) {
90			strcpy(buf, getenv("TMPDIR"));
91			}
92			else {
93			strcpy(buf, "/usr/tmp");
94			}
95			strcat(buf, "/m-prts-");
96			p = getenv("USER");
97			if (!p) p = getenv("LOGNAME");
98			if (!p) p = "x";
99			strcat(buf, p);
100
101			(void)mkdir(buf, 0700);
102
103			p = buf + strlen(buf);
104			*p++ = '/';
105			while (*id && p < buf+sizeof(buf)-10 ) {
106			if (isprint(id) && !strchr(BADCHARS, id)) p++ = id;
107			id++;
108			}
109			*p = '\0';
110			if (mkdir(buf, 0700) == -1 && errno != EEXIST) {
111			perror(buf);
112			return 0;
113			}
114			*p++ = '/';
115			*p = '\0';
116			return buf;
117			}
118
119			/*
120			* We are done with the directory returned by os_idtodir()
121			* Remove it
122			*/
123			void os_donewithdir(char *dir)
124			{
125			char *p;
126
127			/* Remove trailing slash */
128			p = dir + strlen(dir) - 1;
129			*p = '\0';
130
131			rmdir(dir);
132			}
133
134			FILE os_createnewfile(char fname)
135			{
136			int fd;
137			FILE *ret;
138
139			#ifdef O_EXCL
140			fd=open(fname, O_RDWR\|O_CREAT\|O_EXCL, 0644);
141			#else
142			fd=open(fname, O_RDWR\|O_CREAT\|O_TRUNC, 0644);
143			#endif
144
145			if (fd == -1)
146			return NULL;
147
148			ret=fdopen(fd, "w");
149			return ret;
150			}
151
152
153			/*
154			* Create a new file, with suggested filename "fname".
155			* "fname" may have come from an insecure source, so clean it up first.
156			* It may also be null.
157			* "contentType" is passed in for use by systems that have typed filesystems.
158			* "flags" contains a bit pattern describing attributes of the new file.
159			*/
160			FILE os_newtypedfile(char fname, char *contentType, int flags, params contentParams)
161			{
162			char *p;
163			static int filesuffix=0;
164			char buf[128], *descfname=0;
165			FILE *outfile = 0;
166
167			if (!fname) fname = "";
168
169			/* If absolute path name, chop to tail */
170			if (*fname == '/') {
171			p = strrchr(fname, '/');
172			fname = p+1;
173			}
174
175			/* Get rid of leading ~ or ~/ */
176			while (fname == '~' \|\| fname == '/') fname++;
177
178			while (!strncmp(fname, "../", 3)) fname += 3;
179
180			/* Clean out bad characters, create directories along path */
181			for (p=fname; *p; p++) {
182			if (*p == '/') {
183			if (!strncmp(p, "/../", 4)) {
184			p[1] = p[2] = 'X';
185			}
186			*p = '\0';
187			(void) mkdir(fname, 0777);
188			*p = '/';
189			}
190			else if (!isprint(p) \|\| strchr(BADCHARS, p)) *p = 'X';
191			}
192
193			if (!fname[0]) {
194			do {
195			if (outfile) fclose(outfile);
196			sprintf(buf, "part%d", ++filesuffix);
197			} while (outfile = fopen(buf, "r"));
198			fname = buf;
199			}
200			else if (!overwrite_files && (outfile = fopen(fname, "r"))) {
201			do {
202			fclose(outfile);
203			sprintf(buf, "%s.%d", fname, ++filesuffix);
204
205			} while (outfile = fopen(buf, "r"));
206			fname = buf;
207			}
208
209			if (overwrite_files)
210			outfile = fopen(fname, "w");
211			else
212			outfile = os_createnewfile(fname);
213
214			if (!outfile) {
215			perror(fname);
216			}
217
218			if (output_fname) free(output_fname);
219			output_fname = strsave(fname);
220
221			if (strlen(fname) > sizeof(buf)-6) {
222			descfname = xmalloc(strlen(fname)+6);
223			}
224			else {
225			descfname = buf;
226			}
227			strcpy(descfname, fname);
228
229			p = strchr(descfname, '/');
230			if (!p) p = descfname;
231			if (p = strrchr(p, '.')) *p = '\0';
232
233			strcat(descfname, ".desc");
234			(void) rename(TEMPFILENAME, descfname);
235			if (descfname != buf) free(descfname);
236
237			fprintf(stdout, "%s (%s)\n", output_fname, contentType);
238			didchat = 1;
239
240			return outfile;
241			}
242
243			/*
244			* Close a file opened by os_newTypedFile()
245			*/
246			void os_closetypedfile(FILE *outfile)
247			{
248			fclose(outfile);
249			}
250
251			/*
252			* (Don't) Handle a BinHex'ed file
253			*/
254			int
255			os_binhex(struct part *inpart, int part, int nparts)
256			{
257			return 1;
258			}
259
260			/*
261			* Warn user that the MD5 digest of the last file created by os_newtypedfile()
262			* did not match that supplied in the Content-MD5: header.
263			*/
264			void os_warnMD5mismatch(void)
265			{
266			char *warning;
267
268			warning = xmalloc(strlen(output_fname) + 100);
269			sprintf(warning, "%s was corrupted in transit",
270			output_fname);
271			warn(warning);
272			free(warning);
273			}
274
275			/*
276			* Report an error (in errno) concerning a filename
277			*/
278			void os_perror(char *file)
279			{
280			perror(file);
281			}