| File: | src/usr.bin/from/from.c |
| Warning: | line 96, column 21 Although the value stored to 'linelen' is used in the enclosing expression, the value is never actually read from 'linelen' |
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| 1 | /* $OpenBSD: from.c,v 1.28 2021/07/12 15:09:19 beck Exp $ */ |
| 2 | /* $NetBSD: from.c,v 1.6 1995/09/01 01:39:10 jtc Exp $ */ |
| 3 | |
| 4 | /* |
| 5 | * Copyright (c) 1980, 1988, 1993 |
| 6 | * The Regents of the University of California. All rights reserved. |
| 7 | * |
| 8 | * Redistribution and use in source and binary forms, with or without |
| 9 | * modification, are permitted provided that the following conditions |
| 10 | * are met: |
| 11 | * 1. Redistributions of source code must retain the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer. |
| 13 | * 2. Redistributions in binary form must reproduce the above copyright |
| 14 | * notice, this list of conditions and the following disclaimer in the |
| 15 | * documentation and/or other materials provided with the distribution. |
| 16 | * 3. Neither the name of the University nor the names of its contributors |
| 17 | * may be used to endorse or promote products derived from this software |
| 18 | * without specific prior written permission. |
| 19 | * |
| 20 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 21 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 22 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 23 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 24 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 25 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 26 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 27 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 28 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 29 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 30 | * SUCH DAMAGE. |
| 31 | */ |
| 32 | |
| 33 | #include <sys/types.h> |
| 34 | #include <ctype.h> |
| 35 | #include <pwd.h> |
| 36 | #include <stdio.h> |
| 37 | #include <stdlib.h> |
| 38 | #include <unistd.h> |
| 39 | #include <paths.h> |
| 40 | #include <string.h> |
| 41 | #include <err.h> |
| 42 | #include <errno(*__errno()).h> |
| 43 | |
| 44 | int match(char *, char *); |
| 45 | char *mail_spool(char *file, const char *user); |
| 46 | |
| 47 | int |
| 48 | main(int argc, char *argv[]) |
| 49 | { |
| 50 | int ch, newline, fflag = 0; |
| 51 | char *file, *line, *sender, *p; |
| 52 | size_t linesize = 0; |
| 53 | ssize_t linelen; |
| 54 | FILE *fp; |
| 55 | |
| 56 | file = line = sender = NULL((void *)0); |
| 57 | while ((ch = getopt(argc, argv, "f:s:")) != -1) { |
| 58 | switch(ch) { |
| 59 | case 'f': |
| 60 | fflag = 1; |
| 61 | file = optarg; |
| 62 | break; |
| 63 | case 's': |
| 64 | sender = optarg; |
| 65 | for (p = sender; *p; ++p) |
| 66 | if (isupper((unsigned char)*p)) |
| 67 | *p = tolower((unsigned char)*p); |
| 68 | break; |
| 69 | default: |
| 70 | fprintf(stderr(&__sF[2]), |
| 71 | "usage: from [-f file] [-s sender] [user]\n"); |
| 72 | exit(EXIT_FAILURE1); |
| 73 | } |
| 74 | } |
| 75 | argv += optind; |
| 76 | |
| 77 | if (pledge("stdio unveil rpath getpw", NULL((void *)0)) == -1) |
| 78 | err(1, "pledge"); |
| 79 | |
| 80 | file = mail_spool(file, *argv); |
| 81 | |
| 82 | if (unveil(file, "r") == -1) |
| 83 | err(1, "unveil %s", file); |
| 84 | if (pledge("stdio rpath", NULL((void *)0)) == -1) |
| 85 | err(1, "pledge"); |
| 86 | |
| 87 | if ((fp = fopen(file, "r")) == NULL((void *)0)) { |
| 88 | if (!fflag && errno(*__errno()) == ENOENT2) |
| 89 | exit(EXIT_SUCCESS0); |
| 90 | err(1, "%s", file); |
| 91 | } |
| 92 | |
| 93 | if (pledge("stdio", NULL((void *)0)) == -1) |
| 94 | err(1, "pledge"); |
| 95 | |
| 96 | for (newline = 1; (linelen = getline(&line, &linesize, fp)) != -1;) { |
Although the value stored to 'linelen' is used in the enclosing expression, the value is never actually read from 'linelen' | |
| 97 | if (*line == '\n') { |
| 98 | newline = 1; |
| 99 | continue; |
| 100 | } |
| 101 | if (newline && !strncmp(line, "From ", 5) && |
| 102 | (!sender || match(line + 5, sender))) |
| 103 | printf("%s", line); |
| 104 | newline = 0; |
| 105 | } |
| 106 | free(line); |
| 107 | if (ferror(fp)(!__isthreaded ? (((fp)->_flags & 0x0040) != 0) : (ferror )(fp))) |
| 108 | err(EXIT_FAILURE1, "getline"); |
| 109 | fclose(fp); |
| 110 | exit(EXIT_SUCCESS0); |
| 111 | } |
| 112 | |
| 113 | char * |
| 114 | mail_spool(char *file, const char *user) |
| 115 | { |
| 116 | struct passwd *pwd; |
| 117 | |
| 118 | /* |
| 119 | * We find the mailbox by: |
| 120 | * 1 -f flag |
| 121 | * 2 _PATH_MAILDIR/user (from argv) |
| 122 | * 2 MAIL environment variable |
| 123 | * 3 _PATH_MAILDIR/user (from environment or passwd db) |
| 124 | */ |
| 125 | if (file == NULL((void *)0)) { |
| 126 | if (user == NULL((void *)0)) { |
| 127 | if ((file = getenv("MAIL")) == NULL((void *)0)) { |
| 128 | if ((user = getenv("LOGNAME")) == NULL((void *)0) && |
| 129 | (user = getenv("USER")) == NULL((void *)0)) { |
| 130 | if (!(pwd = getpwuid(getuid()))) |
| 131 | errx(1, "no password file " |
| 132 | "entry for you"); |
| 133 | user = pwd->pw_name; |
| 134 | } |
| 135 | } |
| 136 | } |
| 137 | if (file == NULL((void *)0)) { |
| 138 | if (asprintf(&file, "%s/%s", _PATH_MAILDIR"/var/mail", user) == -1) |
| 139 | err(1, NULL((void *)0)); |
| 140 | } |
| 141 | } |
| 142 | return(file); |
| 143 | } |
| 144 | |
| 145 | int |
| 146 | match(char *line, char *sender) |
| 147 | { |
| 148 | char ch, pch, first, *p, *t; |
| 149 | |
| 150 | for (first = *sender++;;) { |
| 151 | if (isspace((unsigned char)(ch = *line))) |
| 152 | return(0); |
| 153 | ++line; |
| 154 | if (isupper((unsigned char)ch)) |
| 155 | ch = tolower((unsigned char)ch); |
| 156 | if (ch != first) |
| 157 | continue; |
| 158 | for (p = sender, t = line;;) { |
| 159 | if (!(pch = *p++)) |
| 160 | return(1); |
| 161 | if (isupper((unsigned char)(ch = *t++))) |
| 162 | ch = tolower((unsigned char)ch); |
| 163 | if (ch != pch) |
| 164 | break; |
| 165 | } |
| 166 | } |
| 167 | /* NOTREACHED */ |
| 168 | } |