| @@ -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 | +} |