Showing the changes to llcache.c (1 of 2 files). Show all
Unified · Split
| @@ -0,0 +1,164 @@ | |||
| 1 | #include <stdio.h> | ||
| 2 | #include <stdlib.h> | ||
| 3 | #include <string.h> | ||
| 4 | #include <fcntl.h> | ||
| 5 | #include <unistd.h> | ||
| 6 | #include <sys/stat.h> | ||
| 7 | #include <sys/time.h> | ||
| 8 | #include <sys/wait.h> | ||
| 9 | #include <libgen.h> | ||
| 10 | #include <openssl/sha.h> | ||
| 11 | |||
| 12 | #define nil NULL | ||
| 13 | |||
| 14 | int | ||
| 15 | main(int argc, char **argv) | ||
| 16 | { | ||
| 17 | char *path, *e, *origexe, *s, exe[4096], *argv0, *in, *out, *dirout, dhh[SHA256_DIGEST_LENGTH*2+1]; | ||
| 18 | uint8_t tmp[65536], dh[SHA256_DIGEST_LENGTH]; | ||
| 19 | int d, f, i, argout; | ||
| 20 | SHA256_CTX shactx; | ||
| 21 | struct stat st; | ||
| 22 | ssize_t n; | ||
| 23 | pid_t pid; | ||
| 24 | |||
| 25 | if((dirout = getenv("LLCACHE_DIR")) == nil){ | ||
| 26 | fprintf(stderr, "LLCACHE_DIR not set\n"); | ||
| 27 | goto err; | ||
| 28 | } | ||
| 29 | if((argv0 = basename(argv[0])) == nil){ | ||
| 30 | fprintf(stderr, "argv[0] is not a proper path\n"); | ||
| 31 | goto err; | ||
| 32 | } | ||
| 33 | |||
| 34 | if((n = readlink("/proc/self/exe", exe, sizeof(exe))) >= (ssize_t)sizeof(exe)){ | ||
| 35 | exesmall: | ||
| 36 | fprintf(stderr, "exe buffer too small\n"); | ||
| 37 | goto err; | ||
| 38 | }else if(n < 0){ | ||
| 39 | perror("exe buffer"); | ||
| 40 | goto err; | ||
| 41 | } | ||
| 42 | exe[n] = 0; | ||
| 43 | origexe = realpath(exe, nil); | ||
| 44 | |||
| 45 | path = strdup(getenv("PATH")); | ||
| 46 | for(s = path; s != nil; s = e ? e + 1 : nil){ | ||
| 47 | if((e = strchr(s, ':')) != nil) | ||
| 48 | *e = 0; | ||
| 49 | if((d = open(s, O_DIRECTORY|O_RDONLY)) < 0) | ||
| 50 | continue; | ||
| 51 | n = readlinkat(d, argv0, exe, sizeof(exe)); | ||
| 52 | if(n >= (ssize_t)sizeof(exe)) | ||
| 53 | goto exesmall; | ||
| 54 | if(n < 0){ | ||
| 55 | if((n = fstatat(d, argv0, &st, 0)) == 0) | ||
| 56 | exe[0] = 0; | ||
| 57 | } | ||
| 58 | close(d); | ||
| 59 | if(n < 0 || strcmp(origexe, exe) == 0) | ||
| 60 | continue; | ||
| 61 | if(snprintf(exe, sizeof(exe), "%s/%s", s, argv0) >= (int)sizeof(exe)) | ||
| 62 | goto exesmall; | ||
| 63 | if((s = realpath(exe, nil)) == nil || strcmp(origexe, s) == 0){ | ||
| 64 | free(s); | ||
| 65 | continue; | ||
| 66 | } | ||
| 67 | |||
| 68 | break; | ||
| 69 | } | ||
| 70 | if(s == nil){ | ||
| 71 | fprintf(stderr, "%s: not found\n", argv0); | ||
| 72 | goto err; | ||
| 73 | } | ||
| 74 | |||
| 75 | SHA256_Init(&shactx); | ||
| 76 | SHA256_Update(&shactx, s, strlen(s)+1); | ||
| 77 | |||
| 78 | in = nil; | ||
| 79 | out = nil; | ||
| 80 | argout = -1; | ||
| 81 | for(i = 1; i < argc; i++){ | ||
| 82 | if(argv[i][0] == '/'){ | ||
| 83 | if(strcmp(argv[i-1], "-o") == 0){ | ||
| 84 | out = argv[i]; | ||
| 85 | argout = i; | ||
| 86 | }else{ | ||
| 87 | in = argv[i]; | ||
| 88 | } | ||
| 89 | }else{ | ||
| 90 | SHA256_Update(&shactx, argv[i], strlen(argv[i])+1); | ||
| 91 | } | ||
| 92 | } | ||
| 93 | if(in == nil || out == nil) | ||
| 94 | goto run; | ||
| 95 | |||
| 96 | if((f = open(in, O_RDONLY)) < 0){ | ||
| 97 | inerr: | ||
| 98 | perror("input"); | ||
| 99 | goto err; | ||
| 100 | } | ||
| 101 | for(;;){ | ||
| 102 | if((n = read(f, tmp, sizeof(tmp))) == 0) | ||
| 103 | break; | ||
| 104 | if(n < 0) | ||
| 105 | goto inerr; | ||
| 106 | SHA256_Update(&shactx, tmp, n); | ||
| 107 | } | ||
| 108 | close(f); | ||
| 109 | |||
| 110 | SHA256_Final(dh, &shactx); | ||
| 111 | for(i = 0; i < (int)sizeof(dh); i++) | ||
| 112 | sprintf(&dhh[i*2], "%02x", dh[i]); | ||
| 113 | |||
| 114 | pid = 0; | ||
| 115 | copy: | ||
| 116 | if((d = open(dirout, O_DIRECTORY)) >= 0 && (f = openat(d, dhh, O_RDONLY)) >= 0 && fstat(f, &st) == 0){ | ||
| 117 | close(d); | ||
| 118 | if((d = creat(out, st.st_mode)) < 0){ | ||
| 119 | perror("creat"); | ||
| 120 | goto err; | ||
| 121 | } | ||
| 122 | for(;;){ | ||
| 123 | if((n = read(f, tmp, sizeof(tmp))) == 0) | ||
| 124 | break; | ||
| 125 | if(n < 0) | ||
| 126 | goto inerr; | ||
| 127 | if(write(d, tmp, n) != n){ | ||
| 128 | perror("output"); | ||
| 129 | goto err; | ||
| 130 | } | ||
| 131 | } | ||
| 132 | close(f); | ||
| 133 | close(d); | ||
| 134 | return 0; | ||
| 135 | } | ||
| 136 | |||
| 137 | if(pid != 0){ | ||
| 138 | fprintf(stderr, "endless loop?\n"); | ||
| 139 | goto err; | ||
| 140 | } | ||
| 141 | |||
| 142 | run: | ||
| 143 | if((pid = fork()) < 0){ | ||
| 144 | perror("fork"); | ||
| 145 | goto err; | ||
| 146 | }else if(pid == 0){ | ||
| 147 | if(argout > 0){ | ||
| 148 | snprintf((char*)tmp, sizeof(tmp), "%s/%s", dirout, dhh); | ||
| 149 | argv[argout] = (char*)tmp; | ||
| 150 | } | ||
| 151 | execvp(s, argv); | ||
| 152 | perror("exec"); | ||
| 153 | goto err; | ||
| 154 | } | ||
| 155 | |||
| 156 | if(waitpid(pid, &i, 0) < 0){ | ||
| 157 | perror("waitpid"); | ||
| 158 | goto err; | ||
| 159 | } | ||
| 160 | if(i == 0) | ||
| 161 | goto copy; | ||
| 162 | err: | ||
| 163 | return 1; | ||
| 164 | } | ||