| 1 | /* |
| 2 | */ |
| 3 | |
| 4 | #include <string.h> |
| 5 | #include <errno.h> |
| 6 | #include <unistd.h> |
| 7 | #include <stdlib.h> |
| 8 | #include <assert.h> |
| 9 | |
| 10 | #include "forwarder.h" |
| 11 | |
| 12 | const char *const *argv; |
| 13 | char programid[SYS_NMLN+sizeof(PROGRAM)+3]; |
| 14 | |
| 15 | void arg_assert_fail(const char *msg) { |
| 16 | fprintf(stderr, PROGRAM ": argument error (!`%s')\n",msg); |
| 17 | exit(12); |
| 18 | } |
| 19 | |
| 20 | void sysfail(const char *msg) { |
| 21 | fprintf(stderr, "%s: fatal system error: %s: %s\n", programid, msg, strerror(errno)); |
| 22 | exit(8); |
| 23 | } |
| 24 | |
| 25 | void fail(const char *msg) { |
| 26 | fprintf(stderr, "%s: fatal error: %s\n", programid, msg); |
| 27 | exit(4); |
| 28 | } |
| 29 | |
| 30 | void sysdiag(const char *msg) { |
| 31 | fprintf(stderr, "%s: system/network error: %s: %s\n", programid, msg, strerror(errno)); |
| 32 | } |
| 33 | |
| 34 | void diag(const char *msg) { |
| 35 | fprintf(stderr, "%s: %s\n", programid, msg); |
| 36 | } |
| 37 | |
| 38 | time_t now(void) { |
| 39 | time_t r; |
| 40 | if (time(&r) == (time_t)-1) sysfail("get time of day"); |
| 41 | return r; |
| 42 | } |
| 43 | |
| 44 | void *xmalloc(size_t sz) { |
| 45 | void *r; |
| 46 | r= malloc(sz); |
| 47 | if (!r) sysfail("allocate memory"); |
| 48 | return r; |
| 49 | } |
| 50 | |
| 51 | void write_must(int fd, const void *p_in, int sz, const char *what) { |
| 52 | const unsigned char *p= p_in; |
| 53 | int r; |
| 54 | |
| 55 | while (sz) { |
| 56 | r= write(fd,p,sz); |
| 57 | if (r<0) { |
| 58 | if (errno == EINTR) continue; |
| 59 | else sysfail(what); |
| 60 | } |
| 61 | assert(r && r <= sz); |
| 62 | p += r; |
| 63 | sz -= r; |
| 64 | } |
| 65 | } |
| 66 | |
| 67 | void read_must(int fd, void *p_in, int sz, const char *what) { |
| 68 | unsigned char *p= p_in; |
| 69 | int r; |
| 70 | |
| 71 | while (sz) { |
| 72 | r= read(fd,p,sz); |
| 73 | if (r<0) { |
| 74 | if (errno == EINTR) continue; |
| 75 | else sysfail(what); |
| 76 | } |
| 77 | if (r==0) fail(what); |
| 78 | assert(r <= sz); |
| 79 | p += r; |
| 80 | sz -= r; |
| 81 | } |
| 82 | } |
| 83 | |
| 84 | const char *getarg_string(void) { |
| 85 | const char *arg; |
| 86 | |
| 87 | arg= *++argv; |
| 88 | arg_assert(arg); |
| 89 | return arg; |
| 90 | } |
| 91 | |
| 92 | unsigned long getarg_ulong(void) { |
| 93 | char *ep; |
| 94 | unsigned long ul; |
| 95 | |
| 96 | ul= strtoul(getarg_string(),&ep,0); |
| 97 | arg_assert(!*ep); |
| 98 | return ul; |
| 99 | } |
| 100 | |
| 101 | void *buf_append(struct buffer *buf, size_t amount) { |
| 102 | void *p; |
| 103 | |
| 104 | p= buf->start + buf->size; |
| 105 | buf->size += amount; |
| 106 | return p; |
| 107 | } |
| 108 | |
| 109 | void *buf_prepend(struct buffer *buf, size_t amount) { |
| 110 | buf->size += amount; |
| 111 | return buf->start -= amount; |
| 112 | } |
| 113 | |
| 114 | void *buf_unappend(struct buffer *buf, size_t amount) { |
| 115 | if (buf->size < amount) return 0; |
| 116 | return buf->start + (buf->size -= amount); |
| 117 | } |
| 118 | |
| 119 | void *buf_unprepend(struct buffer *buf, size_t amount) { |
| 120 | void *p; |
| 121 | |
| 122 | p= buf->start; |
| 123 | buf->start += amount; |
| 124 | buf->size -= amount; |
| 125 | return p; |
| 126 | } |