Mercurial > hg > toybox
annotate toys/pending/nbd_client.c @ 1027:4b0ad1c7af42 draft
syslogd: cleanup
- fix bugs in previous cleanups
- remove config from struct logfile
- simplify parse_config()
author | Felix Janda <felix.janda at posteo.de> |
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date | Sat, 24 Aug 2013 12:04:45 +0200 |
parents | 6f5fed66c722 |
children | e11684e3bbc5 |
rev | line source |
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1 /* vi: set sw=4 ts=4: |
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2 * |
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3 * nbd-client.c - network block device client |
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4 * |
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5 * Copyright 2010 Rob Landley <rob@landley.net> |
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6 * |
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7 * Not in SUSv4. |
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8 |
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9 USE_NBD_CLIENT(NEWTOY(nbd_client, "<3>3ns", TOYFLAG_USR|TOYFLAG_BIN)) |
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10 |
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11 config NBD_CLIENT |
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12 bool "nbd-client" |
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13 default n |
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14 help |
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15 usage: nbd-client [-ns] HOST PORT DEVICE |
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16 |
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17 -n Do not fork into background |
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18 -s nbd swap support (lock server into memory) |
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19 */ |
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20 |
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21 /* |
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22 Usage: nbd-client [-sSpn] [-b BLKSZ] [-t SECS] [-N name] HOST PORT DEVICE |
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23 |
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24 -b block size |
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25 -t timeout in seconds |
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26 -S sdp |
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27 -p persist |
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28 -n nofork |
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29 -d DEVICE |
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30 -c DEVICE |
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31 */ |
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32 |
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33 #define FOR_nbd_client |
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34 #include "toys.h" |
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35 #include "toynet.h" |
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36 |
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37 #define NBD_SET_SOCK _IO(0xab, 0) |
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38 #define NBD_SET_BLKSIZE _IO(0xab, 1) |
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39 #define NBD_SET_SIZE _IO(0xab, 2) |
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40 #define NBD_DO_IT _IO(0xab, 3) |
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41 #define NBD_CLEAR_SOCK _IO(0xab, 4) |
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42 #define NBD_CLEAR_QUEUE _IO(0xab, 5) |
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43 #define NBD_PRINT_DEBUG _IO(0xab, 6) |
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44 #define NBD_SET_SIZE_BLOCKS _IO(0xab, 7) |
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45 #define NBD_DISCONNECT _IO(0xab, 8) |
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46 #define NBD_SET_TIMEOUT _IO(0xab, 9) |
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47 |
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48 void nbd_client_main(void) |
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49 { |
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50 int sock = -1, nbd, flags; |
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51 unsigned long timeout = 0; |
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52 struct addrinfo *addr, *p; |
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53 char *host=toys.optargs[0], *port=toys.optargs[1], *device=toys.optargs[2]; |
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54 uint64_t devsize; |
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55 |
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56 // Repeat until spanked |
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57 |
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58 nbd = xopen(device, O_RDWR); |
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59 for (;;) { |
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60 int temp; |
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61 struct addrinfo hints; |
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62 |
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63 // Find and connect to server |
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64 |
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65 memset(&hints, 0, sizeof(hints)); |
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66 hints.ai_family = PF_UNSPEC; |
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67 hints.ai_socktype = SOCK_STREAM; |
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68 if (getaddrinfo(host, port, &hints, &addr)) addr = 0; |
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69 for (p = addr; p; p = p->ai_next) { |
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70 sock = socket(p->ai_family, p->ai_socktype, p->ai_protocol); |
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71 if (-1 != connect(sock, p->ai_addr, p->ai_addrlen)) break; |
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72 close(sock); |
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73 } |
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74 freeaddrinfo(addr); |
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75 |
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76 if (!p) perror_exit("%s:%s", host, port); |
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77 |
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78 temp = 1; |
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79 setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, &temp, sizeof(int)); |
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80 |
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81 // Read login data |
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82 |
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83 xreadall(sock, toybuf, 152); |
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84 if (memcmp(toybuf, "NBDMAGIC\x00\x00\x42\x02\x81\x86\x12\x53", 16)) |
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85 error_exit("bad login %s:%s", host, port); |
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86 devsize = SWAP_BE64(*(uint64_t *)(toybuf+16)); |
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87 flags = SWAP_BE32(*(int *)(toybuf+24)); |
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88 |
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89 // Set 4k block size. Everything uses that these days. |
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90 ioctl(nbd, NBD_SET_BLKSIZE, 4096); |
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91 ioctl(nbd, NBD_SET_SIZE_BLOCKS, devsize/4096); |
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92 ioctl(nbd, NBD_CLEAR_SOCK); |
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93 |
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94 // If the sucker was exported read only, respect that locally. |
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95 temp = (flags & 2) ? 1 : 0; |
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96 xioctl(nbd, BLKROSET, &temp); |
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97 |
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98 if (timeout && ioctl(nbd, NBD_SET_TIMEOUT, timeout)<0) break; |
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99 if (ioctl(nbd, NBD_SET_SOCK, sock) < 0) break; |
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100 |
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101 if (toys.optflags & FLAG_s) mlockall(MCL_CURRENT|MCL_FUTURE); |
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102 |
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103 // Open the device to force reread of the partition table. |
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104 if ((toys.optflags & FLAG_n) || !fork()) { |
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105 char *s = strrchr(device, '/'); |
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106 int i; |
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107 |
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108 sprintf(toybuf, "/sys/block/%.32s/pid", s ? s+1 : device); |
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109 // Is it up yet? (Give it 10 seconds.) |
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110 for (i=0; i<100; i++) { |
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111 temp = open(toybuf, O_RDONLY); |
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112 if (temp == -1) msleep(100); |
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113 else { |
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114 close(temp); |
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115 break; |
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116 } |
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117 } |
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118 close(open(device, O_RDONLY)); |
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119 if (!(toys.optflags & FLAG_n)) exit(0); |
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120 } |
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121 |
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122 // Daemonize here. |
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123 |
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124 daemon(0,0); |
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125 |
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126 // Process NBD requests until further notice. |
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127 |
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128 if (ioctl(nbd, NBD_DO_IT)>=0 || errno==EBADR) break; |
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129 close(sock); |
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130 } |
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131 close(nbd); |
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132 |
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133 // Flush queue and exit. |
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134 |
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135 ioctl(nbd, NBD_CLEAR_QUEUE); |
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136 ioctl(nbd, NBD_CLEAR_SOCK); |
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137 } |